Stator structure, resin mold, and method for manufacturing the stator structure

Abstract

The present disclosure aims to provide a stator structure, a resin mold, and a method for manufacturing the stator structure that can prevent plastic deformation from occurring in each of the two magnetic members and prevent a decrease in the detection accuracy of the detection equipment. [Solution] The stator structure 1 according to this disclosure comprises a first magnetic member 30, a second magnetic member 40, and a non-magnetic member 50, wherein the first magnetic member 30 and the second magnetic member 40 are arranged facing each other, and the non-magnetic member 50 is arranged between the first magnetic member 30 and the second magnetic member 40, and the non-magnetic member 50 has one or more first spaces 80 that are in contact with the first opposing surface 30a, which is the surface of the first magnetic member 30 that faces the second magnetic member 40, and the non-magnetic member 50 is formed by hardening a non-magnetic material.

Description

Technical Field

[0001] The present disclosure relates to a stator structure, a resin mold, and a method for manufacturing a stator structure.

Background Art

[0002] Conventionally, in a resolver stator, in order to reduce the amount of magnetic material used in a stator core and suppress the manufacturing cost of the stator core, a resolver stator in which a stator yoke and each tooth are formed from a single metal plate is known (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventional resolver stators use a single metal plate to construct the stator yoke and each tooth, thus reducing the amount of magnetic material used and successfully lowering manufacturing costs. Furthermore, to improve detection accuracy, the volume of the teeth is increased by using teeth that are formed by bending and laminating a portion of the metal plate in the direction along the axial direction. However, in such resolver stators, if one attempts to further improve detection accuracy by winding coils around each tooth, the coils would be wound around each tooth extending along the axis of rotation, increasing the air gap between each tooth and the rotor, which prevents further improvement in detection accuracy or even reduces it. This problem was addressed by devising a stator with a novel configuration. Specifically, a stator body was used in which plate-shaped magnetic members, non-magnetic members, and magnetic members were laminated in this order along the axis of rotation. In other words, in such a stator body, the non-magnetic members are laminated with a pair of magnetic members sandwiched in between, so the required thickness of the stator body can be maintained while reducing the amount of magnetic material used for the magnetic members, thereby lowering manufacturing costs. Furthermore, by using such a stator body, it was possible to reduce the impedance of the coil and suppress the increase in the magnetic resistance of the stator body. In addition, with such a stator body, each tooth can be arranged to extend from the stator yoke toward the axis of rotation, so even when coils are wound around each tooth, it was possible to prevent the air gap between the teeth and the rotor from becoming too large. Therefore, in a resolver stator using such a stator body, it was possible to reduce the amount of magnetic material used, while maintaining and improving detection accuracy. When manufacturing such a stator body, a non-magnetic material with fluidity is injected between two magnetic members and then hardened. However, with this manufacturing method, the pressure applied to the non-magnetic material causes plastic deformation of each magnetic material, leading to problems such as a decrease in the detection accuracy of detection equipment such as resolvers.

[0005] This disclosure aims to provide a stator structure, a resin mold, and a method for manufacturing the stator structure that can prevent plastic deformation in each of the two magnetic members and prevent a decrease in the detection accuracy of the detection equipment, in order to solve the above problem. [Means for solving the problem]

[0006] The stator structure according to this disclosure comprises a first magnetic member which is annular or part of an annular shape, a second magnetic member which is annular or part of an annular shape, and a non-magnetic member which is annular or part of an annular shape, wherein the first magnetic member and the second magnetic member face each other and are arranged on a central axis which is a straight line between the centers of the annular shapes of the first magnetic member and the annular shapes of the second magnetic member, the non-magnetic member is arranged between the first magnetic member and the second magnetic member, the first magnetic member has a first opposing surface which is a surface facing the second magnetic member, and the non-magnetic member has one or more first spaces which are in contact with a part of the first opposing surface, and the non-magnetic member is formed by hardening a non-magnetic material.

[0007] The resin mold according to this disclosure comprises a lower mold which is box-shaped with a bottom and defines an internal space, an upper mold which can close the internal space when placed relative to the lower mold, and one or more lower mold support parts which are placed on the lower mold. The lower mold has a bottom portion which is the bottom of the box-shaped bottom and a wall portion which is the wall portion of the box-shaped bottom and extends from the bottom, and the internal space is defined by the wall portion and the bottom. When the first magnetic member constituting the stator body is placed in the internal space, each lower mold support part contacts the surface of the first magnetic member facing the bottom and supports the first magnetic member.

[0008] The method for manufacturing a stator structure according to this disclosure comprises: a preparation step of preparing a resin mold for manufacturing the stator body, a first magnetic member, a second magnetic member, and a non-magnetic material; an arrangement step of arranging the first magnetic member, the second magnetic member, and the non-magnetic material inside the resin mold after the preparation step; a curing step of curing the non-magnetic material after the arrangement step; and a removal step of removing the stator body, which is composed of the cured non-magnetic member, the first magnetic member, and the second magnetic member, from the resin mold after the curing step, wherein the resin mold prepared in the preparation step comprises a bottomed box-shaped lower mold defining the internal space, and a lower The device comprises an upper mold that can close the internal space when placed against the mold, and one or more lower mold support parts placed against the lower mold. The lower mold has a bottom portion which is the bottom of a box-shaped bottom and a wall portion which is the wall portion which is the wall of a box-shaped bottom and extends from the bottom, with the internal space defined by the wall portion and the bottom. In the placement process, a second magnetic member and a first magnetic member are placed in the internal space in order, then the upper mold is placed against the lower mold, then a non-magnetic material is filled into the internal space, and in the placement process, the first magnetic member is supported by being placed against the lower mold such that the surface of the first magnetic member facing the bottom contacts each lower mold support part. [Effects of the Invention]

[0009] According to the stator structure, resin mold, and method for manufacturing the stator structure described herein, it is possible to prevent plastic deformation in each of the two magnetic members and prevent a decrease in the detection accuracy of the resolver. [Brief explanation of the drawing]

[0010] [Figure 1] This is a schematic diagram showing the stator structure according to Embodiment 1. [Figure 2] Figure 1 is a perspective view showing the teeth section. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 2. [Figure 4] Figure 2 is a schematic diagram showing a part of the first magnetic member. [Figure 5] Figure 2 is a schematic diagram showing a part of the second magnetic member. [Figure 6] It is a flowchart showing a method for manufacturing a stator structure according to Embodiment 1. [Figure 7] It is a perspective view showing a part of a resin mold according to Embodiment 1. [Figure 8] It is a perspective view showing the lower mold of FIG. 7. [Figure 9] It is a schematic view showing the lower mold support part of FIG. 8. [Figure 10] It is a schematic view showing a state where a first magnetic member and a second magnetic member are arranged on the lower mold of FIG. 7. [Figure 11] It is a conceptual diagram when filling a non-magnetic material into the resin mold in FIG. 7. [Figure 12] It is a cross-sectional view corresponding to a cross-sectional view along the radial direction of the tip shown in FIG. 3. [Figure 13] It is a schematic view showing a teeth part according to Modified Example 1 of Embodiment 1. [Figure 14] It is a perspective view showing a part of a resin mold according to Modified Example 1 of Embodiment 1. [Figure 15] It is a schematic view showing a teeth part according to Embodiment 2. [Figure 16] It is a schematic view showing a part of the first magnetic member of FIG. 15. [Figure 17] It is a schematic view showing a part of the second magnetic member of FIG. 15. [Figure 18] It is a conceptual diagram when filling a non-magnetic material into the resin mold in Embodiment 2. [Figure 19] It is a schematic view showing a teeth part according to Modified Example 1 of Embodiment 2. [Figure 20] It is a schematic view showing a teeth part according to Embodiment 3. [Figure 21] It is a schematic view showing a part of the first magnetic member of FIG. 20. [Figure 22] It is a schematic view showing a part of the second magnetic member of FIG. 20. [Figure 23] It is a perspective view showing the lower mold according to Embodiment 3. [Figure 24] It is a schematic view showing a teeth part according to Modified Example 1 of Embodiment 3. [Figure 25] This is a schematic diagram showing the teeth portion according to Embodiment 4. [Figure 26] This is a schematic diagram showing the lower mold according to Embodiment 4. [Figure 27] Figure 26 is a schematic diagram showing the state during the lower mold placement process. [Figure 28] This is a schematic diagram showing the teeth portion according to a modified example 1 of Embodiment 4. [Figure 29] This is a schematic diagram showing the state during the lower mold placement process in Modification 1 of Embodiment 4. [Modes for carrying out the invention]

[0011] Embodiments of this disclosure will be described below with reference to the drawings. Embodiment 1. Figure 1 is a schematic diagram showing a stator structure 1 according to Embodiment 1. The stator structure 1 can be applied as a resolver or a stator for a torque sensor.

[0012] The stator structure 1 is annular in shape. The axis passing through the center of the annular shape of the stator structure 1 is called the central axis L. A rotating body 90, such as a rotor, is placed in a hole opened in the center of the stator structure 1. The central axis L and the rotation axis of the rotating body 90 coincide.

[0013] The stator structure 1 and the rotating body 90 are arranged in a non-contact manner. A resolver or torque sensor can use the stator structure 1 to detect physical quantities such as the rotation angle, rotation speed, or rotation torque of the rotating body 90.

[0014] The stator structure 1 comprises an annular stator body 10 and 14 coils 15. Here, the shape of the stator structure 1 is approximately the same as the shape of the stator body 10, and the axis passing through the center of the annular stator body 10 is the central axis L.

[0015] The stator body 10 has an annular yoke portion 11 and 14 teeth portions 12 extending radially inward from the yoke portion 11, i.e., toward the central axis L. Each coil 15 is arranged in each teeth portion 12. Each coil 15 may be arranged by winding a wire around the corresponding teeth portion 12, or a core member that will become the coil 15 may be arranged.

[0016] Each tooth portion 12 has a body portion 13 extending from the yoke portion 11 and a tip portion 14 which is the tip portion in the direction toward the central axis L from the body portion 13. Each coil 15 is arranged in the corresponding body portion 13.

[0017] Furthermore, the number of teeth 12 and coils 15 is not limited to 14; any number may be provided.

[0018] The stator body 10 includes an annular first magnetic member 30, an annular second magnetic member 40, and an annular non-magnetic member 50. The first magnetic member 30 and the second magnetic member 40 have a plate-like shape.

[0019] When viewed along the central axis L, the first magnetic member 30 and the second magnetic member 40 have annular shapes and are substantially identical in shape. The first magnetic member 30 and the second magnetic member 40 are positioned opposite each other such that their outer shapes coincide when viewed along the central axis L.

[0020] In other words, the first magnetic member 30 and the second magnetic member 40 are positioned on a central axis L which is a straight line between the center of the ring of the first magnetic member 30 and the center of the ring of the second magnetic member 40.

[0021] The first magnetic member 30 and the second magnetic member 40 are made of magnetic material. Examples of magnetic material include electrical steel sheets, permalloy, ferrite, nanocrystalline soft magnetic alloys, or amorphous alloys.

[0022] The non-magnetic member 50 is positioned between the first magnetic member 30 and the second magnetic member 40. The shape of the non-magnetic member 50 is substantially the same as that of the first magnetic member 30 and the second magnetic member 40. When viewed along the central axis L, the first magnetic member 30, the second magnetic member 40, and the non-magnetic member 50 are stacked and arranged so that their respective outer shapes match.

[0023] The non-magnetic component 50 is made of a non-magnetic material. Examples of non-magnetic materials include non-magnetic stainless steel or resin.

[0024] Figure 2 is a perspective view showing the teeth portion 12 of Figure 1. Figure 3 is a cross-sectional view taken along line III-III in Figure 2. Figure 2 shows the view from the second magnetic member 40 side. Figure 3 shows a cross-section along the radial direction of the tip portion 14, with the first magnetic member 30 shown at the top of the drawing.

[0025] The first magnetic member 30 has a first opposing surface 30a which is the surface facing the second magnetic member 40. That is, the first opposing surface 30a is the surface of the first magnetic member 30 facing the non-magnetic member 50, and the first opposing surface 30a is the surface of the first magnetic member 30 facing the second magnetic member 40.

[0026] A first space 80 is formed at the tip 14 of each tooth portion 12. The first space 80 is formed on the side surface of the tip portion 14. Each first space 80 is formed on the side surface of the tip portion 14 in the direction toward the central axis L.

[0027] Each first space 80 is defined in part by a part of the first opposing surface 30a of the first magnetic member 30, a non-magnetic side surface 50s which is a part of the side surface of the non-magnetic member 50, and a second side surface 40s which is a part of the side surface of the second magnetic member 40.

[0028] Each first space 80 extends along the central axis L from the first opposing surface 30a across the non-magnetic member 50 and the second magnetic member 40, until it extends beyond the second magnetic member 40. That is, each first space 80 is formed in the non-magnetic member 50 and is in contact with a part of the first opposing surface 30a.

[0029] Figure 4 is a schematic diagram showing a part of the first magnetic member 30 of Figure 2. The first magnetic member 30 has an annular first yoke portion 31 and 14 first teeth portions 32 extending radially inward from the first yoke portion 31 toward the central axis L. Each first teeth portion 32 has a first body portion 33 extending from the first yoke portion 31 and a first tip portion 34 which is the tip portion in the direction toward the central axis L from the first body portion 33.

[0030] Figure 5 is a schematic diagram showing a part of the second magnetic member 40 of Figure 2. The second magnetic member 40 has an annular second yoke portion 41 and 14 second teeth portions 42 extending radially inward from the second yoke portion 41 toward the central axis L. Each second teeth portion 42 has a second body portion 43 extending from the second yoke portion 41 and a second tip portion 44 which is the tip portion in the direction toward the central axis L from the second body portion 43.

[0031] When viewed along the central axis L, a recessed second retracted portion 40c is formed on the tip portion of the second tip portion 44 facing the central axis L, that is, on the side facing the central axis L. The surface of the second retracted portion 40c is the second side surface 40s, which extends in the direction of the central axis L.

[0032] As shown in Figure 4, the first magnetic member 30 does not have a recess corresponding to the second retracted portion 40c.

[0033] Returning to Figures 2 and 3, we will continue the explanation. The non-magnetic member 50 has an annular non-magnetic yoke portion 51 and a non-magnetic tooth portion 52 extending radially inward from the non-magnetic yoke portion 51, that is, toward the central axis L. Each non-magnetic tooth portion 52 has a non-magnetic body portion 53 extending from the non-magnetic yoke portion 51 and a non-magnetic tip portion 54 which is the tip portion in the direction toward the central axis L from the non-magnetic body portion 53.

[0034] When viewed along the central axis L, a non-magnetic retractable portion 50c, which is a recess, is formed on the tip portion of the non-magnetic tip portion 54 facing the central axis L, that is, on the side facing the central axis L. The surface of the non-magnetic retractable portion 50c is the non-magnetic side surface 50s, which extends in the direction of the central axis L.

[0035] Each first space 80 is composed of a space surrounded by a non-magnetic retraction portion 50c, which is a corresponding recess formed on the side surface of the non-magnetic member 50, and a space surrounded by a second retraction portion 40c, which is a corresponding recess formed on the side surface of the second magnetic member 40.

[0036] Each non-magnetic side surface 50s and its corresponding second side surface 40s form a continuous surface. The non-magnetic side surfaces 50s and the second side surfaces 40s that form a continuous surface enclose and define at least a portion of the first space 80.

[0037] Next, the method for manufacturing the stator structure 1 in Embodiment 1 will be described. Figure 6 is a flowchart showing the method for manufacturing the stator structure 1 according to Embodiment 1.

[0038] <Preparation process> First, in step S01, preparation step S01 is carried out. Preparation step S01 is the process of preparing the components that make up the stator structure 1.

[0039] The worker prepares a resin mold, a first magnetic member 30, a second magnetic member 40, and a non-magnetic material for the manufacture of the stator structure 1. Each of the parts prepared in preparation step S01, namely the first magnetic member 30, the second magnetic member 40, and the resin mold, is pre-processed to the desired shape. The resin mold will be described later.

[0040] The first magnetic member 30 and the second magnetic member 40 are processed into desired shapes. The second magnetic member 40 has a second retractable portion 40c formed on each.

[0041] The non-magnetic material is prepared in a fluid state. As the non-magnetic material, one that hardens by accelerating the crosslinking reaction can be used. For example, as the non-magnetic material, one that hardens by accelerating the crosslinking reaction due to temperature changes may be used.

[0042] Furthermore, non-magnetic materials may be used, for example, those that harden when additives are added. In that case, at least the additives are also prepared in preparation step S01.

[0043] Furthermore, a non-magnetic material with additives added may be prepared in preparation step S01. If a non-magnetic material with additives added is prepared in preparation step S01, it is necessary to prepare the non-magnetic material so that it has sufficient fluidity to carry out the next placement step S02. This completes preparation step S01. The process then proceeds to the next step.

[0044] <Placement process> In step S02, the placement process S02 is carried out. The placement process S02 is the process of placing the first magnetic member 30 and the second magnetic member 40 in the resin mold 200, and then placing the prepared non-magnetic material in the resin mold.

[0045] Now, let's describe the resin mold 200. Figure 7 is a perspective view showing a part of the resin mold 200 according to Embodiment 1. In Figure 7, only the portion corresponding to one of the teeth 12 of the resin mold 200 is shown.

[0046] Figure 7 shows the resin mold 200 cut along a line that includes the boundary between the wall portion 201a and the lower mold support portion 210, in the wall portion 201a that defines the tip space 224. Figure 7 shows the state in which the first magnetic member 30 and the second magnetic member 40 are arranged inside the resin mold 200.

[0047] The resin molding mold 200 is a mold for molding the stator body 10 from resin. The first magnetic member 30 and the second magnetic member 40 are placed in the resin molding mold 200, and then resin is filled and cured to form the stator body 10.

[0048] The resin molding die 200 comprises a lower mold 201 which is bottomed and box-shaped and defines an internal space 220, an upper mold 202 which can close the internal space 220 when placed relative to the lower mold 201, and 14 lower mold support parts 210 which are placed on the lower mold 201. Figure 8 is a perspective view showing the lower mold 201 of Figure 7. In Figure 8, a portion of the lower mold 201 is shown that corresponds to one tooth portion 12 of the lower mold 201, that is, a portion of the lower mold 201 cut out along a line surrounding one tooth space 222.

[0049] The lower mold 201 has a bottom portion 201b, which is the bottom part of a box-shaped structure with a bottom, and a wall portion 201a, which is the wall portion of a box-shaped structure with a bottom, extending from the bottom portion 201b. As can be seen in Figure 8, when the bottom portion 201b is positioned horizontally with respect to the plane of the paper, the wall portion 201a extends vertically with respect to the plane of the paper. That is, the wall portion 201a extends vertically upward from the bottom portion 201b.

[0050] The space enclosed by the wall portion 201a and the bottom portion 201b is the internal space 220. That is, the internal space 220 is defined by the wall portion 201a and the bottom portion 201b. The internal space 220 has a yoke space 221 which is an annular space, and 14 teeth spaces 222 which are spaces extending from the yoke space 221 toward the center of the annulus.

[0051] Each tooth space 222 has a body space 223 which extends from the yoke space 221, and a tip space 224 which is the tip portion extending from the body space 223 toward the center of the ring. Each tooth space 222 is a space that extends toward the center of the ring, and its side surface is defined by a pair of opposing wall portions 201a. Similarly, the body space 223 is defined by a pair of opposing wall portions 201a.

[0052] Each of the yoke space 221, each tooth space 222, each body space 223, and each tip space 224 of the internal space 220 corresponds to the yoke portion 11, the tooth portion 12, the body portion 13, and the tip portion 14 of the stator body 10 that is formed.

[0053] Each lower mold support portion 210 is formed along a wall portion 201a that defines the corresponding tip space 224. That is, each lower mold support portion 210 is formed and positioned at a corresponding position on the tip portion of the corresponding tooth space 222, facing toward the center of the annular shape.

[0054] Figure 9 is a schematic diagram showing the lower mold support portion 210 of Figure 8. Figure 9 shows a portion of the lower mold 201 including one lower mold support portion 210. Each lower mold support portion 210 is a protrusion extending from the wall portion 201a.

[0055] Each lower mold support portion 210 is positioned to extend vertically upward from the bottom 201b of the lower mold 201, similar to the wall portion 201a. When the upper mold 202 is positioned on the lower mold 201, each lower mold support portion 210 extends from the bottom 201b toward the upper mold 202. The ends of the lower mold support portions 210 that are vertically upward from the bottom 201b form a flat lower mold support end portion 210a.

[0056] Furthermore, in the stator body 10 manufactured by the resin mold 200, when the stator body 10 is positioned on the lower mold 201, the direction in which the wall portion 201a extends, the direction in which each lower mold support portion 210 extends, and the direction of the central axis L are all equal to each other. That is, the shape of the internal space 220 is such that the direction of the central axis L of the manufactured stator body 10 is equal to the direction in which the wall portion 201a extends and the direction in which each lower mold support portion 210 extends.

[0057] Let's continue with the explanation of the placement process S02. In the placement process S02, the worker first places the second magnetic member 40 inside the lower mold 201 of the resin molding die 200, and then places the first magnetic member 30. Figure 10 is a schematic diagram showing the state in which the first magnetic member 30 and the second magnetic member 40 are placed inside the lower mold 201 of Figure 7.

[0058] Figure 10 shows only the portion of the lower mold 201 corresponding to one tooth portion 12, and a cross-sectional view is shown along the line including the boundary line between the wall portion 201a and the lower mold support portion 210 in the wall portion 201a that defines the tip space 224. Figure 10 shows the state in which the upper mold 202 is not placed relative to the lower mold 201.

[0059] The second magnetic member 40 is positioned below the internal space 220 of the lower mold 201. Each lower mold support portion 210 is formed and positioned opposite to the corresponding second retracted portion 40c of the second magnetic member 40 when the second magnetic member 40 is placed in the lower mold 201.

[0060] That is, with the second magnetic member 40 positioned on the lower mold 201, each second retractable portion 40c aligns with the side surface of the corresponding lower mold support portion 210, and the second side surface 40s of each second retractable portion 40c is in contact with the side surface of the corresponding lower mold support portion 210.

[0061] The first magnetic member 30 is positioned above the second magnetic member 40 in the internal space 220 of the lower mold 201. In this state, the first opposing surface 30a of the first magnetic member 30, which is the surface facing the bottom 201b, is in contact with the lower mold support end 210a of the corresponding lower mold support portion 210. That is, the first magnetic member 30 is supported by each lower mold support portion 210.

[0062] Once the placement of the first magnetic member 30 and the second magnetic member 40 on the lower mold 201 is complete, the worker places the upper mold 202 on the lower mold 201, as shown in Figure 7, that is, places the upper mold 202 on top of the lower mold 201. This clamps the mold and closes the internal space 220.

[0063] Next, a non-magnetic material is filled into the closed internal space 220. Figure 11 is a conceptual diagram of filling the resin mold 200 in Figure 7 with a non-magnetic material. In Figure 11, the upper mold 202 and lower mold 201 are not shown.

[0064] The resin mold 200, which is formed by placing the upper mold 202 on the lower mold 201 and clamping it, has an inlet (not shown) formed therein. An operator can pour a fluid, non-magnetic material through the inlet (not shown) and fill the internal space 220 of the resin mold 200 with the non-magnetic material.

[0065] When the non-magnetic material is poured and filled into the internal space 220, a molding pressure P is applied to the non-magnetic material. This allows the non-magnetic material to be poured into every corner of the internal space 220 of the resin mold 200. At this time, the first teeth portion 32 of the first magnetic member 30 is positioned in contact with the lower mold support end 210a of the lower mold support portion 210, so it does not bend in the direction toward the second magnetic member 40.

[0066] When the internal space 220 of the resin mold 200 is filled with a specified amount of non-magnetic material, the placement process S02 is completed. The process then proceeds to the next step. Return to Figure 6 and continue the explanation.

[0067] Furthermore, when using non-magnetic materials that harden by the addition of additives, the additives should be added to the non-magnetic material in advance as appropriate.

[0068] <Curing process> In step S03, the curing process S03 is carried out. The curing process S03 is a process of curing the non-magnetic material in the mold that was placed in the placement process S02.

[0069] In the curing process S03, the resin mold 200, in which the first magnetic member 30, the second magnetic member 40, and the non-magnetic material are placed, is left to cure the non-magnetic material. After a sufficient amount of time has elapsed, the non-magnetic material hardens and becomes the non-magnetic member 50.

[0070] This forms a stator body 10 comprising a first magnetic member 30, a second magnetic member 40, and a non-magnetic member 50 positioned between them. With this, the curing process S03 is completed. The process proceeds to the next step.

[0071] Furthermore, in order to cure non-magnetic materials, it is necessary to promote the cross-linking reaction of the resin. Depending on the type of resin that makes up the non-magnetic material, it may suffice to simply leave the resin mold 200 in a specific location. However, the resin mold 200 may also be left in an environment in which the non-magnetic material will cure in a short time. For example, it may be left in an environment at a temperature higher than typical room temperature.

[0072] <Removal process> In step S04, the removal process S04 is performed. The removal process S04 is the process of removing the stator body 10, which was manufactured by curing in the resin mold 200 in the curing process S03, from the resin mold 200.

[0073] The worker removes the upper mold 202 from the lower mold 201 and takes out the stator body 10 from the lower mold 201. At this time, the stator body 10 is moved upward in a vertical direction relative to the bottom 201b, which is the direction in which each lower mold support part 210 extends. As a result, the stator body 10 is removed from the lower mold 201.

[0074] Furthermore, if the stator body 10 can be removed without interference between the stator body 10 and the wall portion 201a, the direction in which the wall portion 201a extends and the direction in which each lower mold support portion 210 extends do not need to be the same.

[0075] Furthermore, if the stator body 10 can be moved and removed from the lower mold 201 in a specific direction, the direction of the central axis L of the stator body 10, the direction in which the wall portion 201a extends, and the direction in which the lower mold support portion 210 extends do not have to be the same. Therefore, each first space 80 does not have to extend along the central axis L.

[0076] This completes the removal process S04. After the removal process S04 is completed, each coil 15 is placed on the stator body 10, and the connections of each component are made, completing the manufacturing of the stator structure 1.

[0077] Each first space 80 formed in the stator body 10 is the location where the corresponding lower mold support portion 210 was present during the placement process S02 and the curing process S03. In other words, since the lower mold support portion 210 was present during manufacturing, these are the locations where the non-magnetic material was not filled, resulting in empty spaces. Furthermore, since each lower mold support portion end 210a was in contact with the corresponding location on the first opposing surface 30a of the first magnetic member 30 during the placement process S02 and the curing process S03, each first space 80 is in contact with the corresponding first opposing surface 30a.

[0078] Similarly, in the placement step S02 and the curing step S03, each second side surface 40s was in contact with the corresponding lower mold support 210, so at least a portion of each first space 80 is defined by the corresponding second side surface 40s. Similarly, since the nonmagnetic material was cured while in contact with each lower mold support 210, at least a portion of each first space 80 is defined by the corresponding nonmagnetic side surface 50s.

[0079] Similarly, since each second side surface 40s and the non-magnetic material were in contact with the corresponding lower mold support 210, the second side surfaces 40s and the non-magnetic side surfaces 50s that define at least a portion of each first space 80 are continuous with each other.

[0080] In the stator body 10, the non-magnetic member 50, which is made of a hardened non-magnetic material, is in contact with the first magnetic member 30 and the second magnetic member 40. That is, because the non-magnetic material, which was in a fluid state, hardened while being placed in close contact with the first magnetic member 30 and the second magnetic member 40, the non-magnetic member 50 is in close contact with the first magnetic member 30 and the second magnetic member 40.

[0081] The relative positions of the first magnetic member 30 and the second magnetic member 40 are determined and fixed by the hardened non-magnetic material, which is the non-magnetic member 50.

[0082] In Embodiment 1, the second side surface 40s is exposed in each first space 80. However, this is not the only option. For example, the second side surface 40s may be covered with a non-magnetic member 50. Figure 12 is a cross-sectional view corresponding to the radial cross-sectional view of the tip portion 14 shown in Figure 3. The second side surface 40s shown in Figure 12 is covered with a non-magnetic member 50. In order to form such a first space 80, in the arrangement step S02, the second magnetic member 40 is arranged such that the second side surface 40s does not come into contact with the lower mold support portion 210, and a space is formed between the lower mold support portion 210 and the corresponding second side surface 40s. As a result, the first space 80 is defined only by the non-magnetic member 50. That is, the non-magnetic member 50 may be placed between the first space 80 and the second side surface 40s. If the contact between each lower mold support portion 210 and the corresponding second side surface 40s is used as the reference for positioning the second magnetic member 40 relative to the lower mold 201, then it is necessary to prepare other positioning references.

[0083] Furthermore, each first space 80 described in Embodiment 1 is formed in each tip portion 14. However, it is not limited to this. For example, a first space 80 may be formed in any of the tip portions 14. Each first space 80 can be designed to be in an appropriately optimal position depending on the manufacturing of the resin mold 200 and the strength of the first magnetic member 30.

[0084] The stator structure 1 according to Embodiment 1 comprises a first magnetic member 30 which is annular or part of an annular shape, a second magnetic member 40 which is annular or part of an annular shape, and a non-magnetic member 50 which is annular or part of an annular shape. The first magnetic member 30 and the second magnetic member 40 face each other and are positioned on a central axis L which is a straight line between the center of the annular shape of the first magnetic member 30 and the center of the annular shape of the second magnetic member 40. The non-magnetic member 50 is positioned between the first magnetic member 30 and the second magnetic member 40. The first magnetic member 30 has a first opposing surface 30a which faces the second magnetic member 40. The non-magnetic member 50 has one or more first spaces 80 which are in contact with a part of the first opposing surface 30a. The non-magnetic member 50 is formed by hardening a non-magnetic material. This allows for the placement of a lower mold support 210 that supports the first opposing surface 30a of the first magnetic member 30, which is positioned above the second magnetic member 40, when filling the resin mold 200 with a non-magnetic material and curing it. Therefore, plastic deformation of the first magnetic member 30 due to the filling of the non-magnetic material under molding pressure P can be prevented. Thus, a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection equipment. Furthermore, this allows for the placement of a lower mold support 210 that supports the first opposing surface 30a of the first magnetic member 30, which is positioned above the second magnetic member 40, when filling the resin mold 200 with a non-magnetic material and curing it. Therefore, plastic deformation of the first magnetic member 30 can be prevented without selecting a non-magnetic material with high fluidity. Thus, the range of choices in selecting a non-magnetic material is not narrowed, and the manufacturing cost of the stator structure 1 can be reduced. Furthermore, this allows for a thinner first magnetic member 30. Thus, the amount of magnetic material used can be reduced, and the manufacturing cost of the stator structure 1 can be reduced.

[0085] In the stator structure 1 according to Embodiment 1, each first space 80 extends from the first opposing surface 30a across the non-magnetic member 50 and the second magnetic member 40, and beyond the second magnetic member 40. This allows each lower mold support portion 210, which extends from the bottom 201b beyond the second magnetic member 40 to the first opposing surface 30a, to be positioned in the lower mold 201 of the resin molding die 200 for curing the filled non-magnetic material to form the stator body 10. Therefore, the completed stator body 10 can be removed from the lower mold 201 by moving it in a direction along the direction in which each lower mold support portion 210 extends relative to the lower mold 201. Thus, the removal of the stator body 10 becomes easy, and the manufacturing cost of the stator body 10 can be reduced.

[0086] In the stator structure 1 according to Embodiment 1, each first space 80 is composed of a space surrounded by a non-magnetic retraction portion 50c, which is a corresponding recess formed on the side surface of the non-magnetic member 50, and a space surrounded by a second retraction portion 40c, which is a corresponding recess formed on the side surface of the second magnetic member 40. This allows the second side surface 40s to be positioned so as to contact the lower mold support portion 210 when the second magnetic member 40 is placed in the lower mold 201. Therefore, the positioning of the second magnetic member 40 when filling with non-magnetic material can be performed more reliably. Thus, when the completed stator body 10 is viewed along the central axis L, the second magnetic member 40 is positioned correctly, and a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection equipment. Furthermore, this further prevents the position of the second magnetic member 40 from shifting when filling with non-magnetic material. Thus, when the completed stator body 10 is viewed along the central axis L, the second magnetic member 40 is positioned correctly, and a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection equipment.

[0087] In the stator structure 1 according to Embodiment 1, the second magnetic member 40 has a second yoke portion 41 that is annular or part of an annular shape, and a plurality of second teeth portions 42 that extend from the second yoke portion 41 toward the central axis L. The non-magnetic member 50 also has a non-magnetic yoke portion 51 that is annular or part of an annular shape, and a plurality of non-magnetic teeth portions 52 that extend from the non-magnetic yoke portion 51 toward the central axis L. Each second retractable portion 40c is formed on the side surface of the corresponding second teeth portion 42 toward the tip in the direction toward the central axis L. Each non-magnetic retractable portion 50c is formed on the side surface of the corresponding non-magnetic teeth portion 52 toward the tip in the direction toward the central axis L. As a result, the first tip portion 34 of the first magnetic member 30 can be supported by the lower mold support portion 210. Therefore, plastic deformation of the first magnetic member 30 can be effectively prevented with the minimum necessary lower mold support portion 210. Therefore, by reducing the number of lower mold support units 210, the manufacturing cost of the lower mold 201 can be reduced, and a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection equipment while keeping manufacturing costs down.

[0088] In the stator structure 1 according to Embodiment 1, the second side surface 40s, which is the side surface of each second retracted portion 40c, is exposed to the corresponding first space 80. This allows the second magnetic member 40 to be positioned on the lower mold 201 by abutting the second retracted portion 40c corresponding to the lower mold support portion 210 when manufacturing the stator body 10. Therefore, the positioning of the second magnetic member 40 becomes easier, and the stator structure 1 can be obtained more easily.

[0089] In the stator structure 1 according to Embodiment 1, the second side surface 40s of each second retractable portion 40c is covered with a non-magnetic member 50. This allows for a gap to be created between each lower mold support portion 210 formed on the lower mold 201 and each second retractable portion 40c placed on the lower mold 201 during the manufacturing of the stator body 10. Consequently, the second magnetic member 40 can be placed on the lower mold 201 more smoothly. Thus, the manufacturing of the stator body 10 becomes easier, and the manufacturing cost of the stator structure 1 can be reduced.

[0090] The resin mold 200 according to Embodiment 1 comprises a lower mold 201 which is bottomed and box-shaped and defines an internal space 220, an upper mold 202 which can close the internal space 220 when positioned relative to the lower mold 201, and one or more lower mold support parts 210 positioned on the lower mold 201. The lower mold 201 has a bottom portion 201b which is the bottom of the bottomed box shape, and a wall portion 201a which is the wall portion of the bottomed box shape and extends from the bottom portion 201b. The internal space 220 is defined by the wall portion 201a and the bottom portion 201b. When the first magnetic member 30 constituting the stator body 10 is positioned in the internal space 220, each lower mold support part 210 contacts the surface of the first magnetic member 30 facing the bottom portion 201b and supports the first magnetic member 30. This allows for the placement of a lower mold support 210 that supports the first opposing surface 30a of the first magnetic member 30, which is positioned above the second magnetic member 40, when filling and curing with a non-magnetic material. Therefore, plastic deformation of the first magnetic member 30 due to the filling of the non-magnetic material under molding pressure P can be prevented. Thus, a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection equipment. Furthermore, this allows for the placement of a lower mold support 210 that supports the first opposing surface 30a of the first magnetic member 30, which is positioned above the second magnetic member 40, when filling and curing with a non-magnetic material. Therefore, plastic deformation of the first magnetic member 30 can be prevented without selecting a non-magnetic material with high fluidity. Thus, the range of choices in selecting a non-magnetic material is not narrowed, and the manufacturing cost of the stator structure 1 can be reduced. Furthermore, this allows for a thinner first magnetic member 30. Thus, the amount of magnetic material used can be reduced, and the manufacturing cost of the stator structure 1 can be reduced.

[0091] In the resin mold 200 according to Embodiment 1, each lower mold support portion 210 is a protrusion extending from the wall portion 201a, and when the upper mold 202 is positioned relative to the lower mold 201, each lower mold support portion 210 extends from the bottom portion 201b toward the upper mold 202. As a result, the stator body 10, in which the non-magnetic material has hardened, can be removed from the lower mold 201 by moving it in the direction along the extending direction of each lower mold support portion 210. Therefore, it is possible to obtain a resin mold 200 that makes it easy to remove the stator body 10 and reduces the manufacturing cost of the stator body 10. In addition, it is possible to prevent obstruction of the flow of non-magnetic material in the internal space 220 as much as possible. Therefore, it is possible to stably fill the non-magnetic material and obtain a high-quality stator structure 1.

[0092] In the resin mold 200 according to Embodiment 1, the internal space 220 is composed of a yoke space 221, which is an annular space, and one or more tooth spaces 222, which are spaces extending from the yoke space 221 toward the center of the annulus. Furthermore, the wall portion 201a from which each lower mold support portion 210 protrudes is a wall portion 201a that defines the tip portion of the corresponding tooth space 222 in the direction toward the center of the annulus. This allows the tip portion of the first tooth portion 32 to be supported. Therefore, plastic deformation of the tip portion of the first tooth portion 32 can be efficiently prevented. Thus, a stator structure 1 can be obtained that can prevent a decrease in the detection accuracy of the detection equipment.

[0093] The manufacturing method for the stator structure 1 according to Embodiment 1 includes a preparation step S01 for preparing a resin mold 200 for manufacturing the stator body 10, a first magnetic member 30, a second magnetic member 40, and a non-magnetic material. Following the preparation step S01, there is an arrangement step S02 for arranging the first magnetic member 30, the second magnetic member 40, and the non-magnetic material inside the resin mold 200. Following the arrangement step S02, there is a curing step S03 for curing the non-magnetic material. Following the curing step S03, there is a removal step S04 for removing the stator body 10, which is composed of the cured non-magnetic member 50, the first magnetic member 30, and the second magnetic member 40, from the resin mold 200. Furthermore, the resin mold 200 prepared in preparation step S01 comprises a lower mold 201 which is bottomed and box-shaped and defines an internal space 220, an upper mold 202 which can close the internal space 220 when placed relative to the lower mold 201, and one or more lower mold support parts 210 which are placed on the lower mold 201. The lower mold 201 also has a bottom portion 201b which is the bottom part of the bottomed box shape, and a wall portion 201a which is the wall portion of the bottomed box shape and extends from the bottom portion 201b. The internal space 220 is defined by the wall portion 201a and the bottom portion 201b. Furthermore, in placement step S02, the second magnetic member 40 and the first magnetic member 30 are placed in the internal space 220 in order, then the upper mold 202 is placed relative to the lower mold 201, and then a non-magnetic material is filled into the internal space 220. Furthermore, in the placement process S02, the first magnetic member 30 is positioned on the lower mold 201 such that the surface facing the bottom 201b of the first magnetic member 30 is in contact with each lower mold support portion 210, thereby supporting the first magnetic member 30. This allows the lower mold support portion 210 to support the first opposing surface 30a of the first magnetic member 30 when filling with non-magnetic material and curing. Consequently, plastic deformation of the first magnetic member 30 due to the filling of non-magnetic material under molding pressure P can be prevented. Thus, a stator structure 1 that can prevent a decrease in the detection accuracy of the detection equipment can be manufactured. Moreover, this allows the lower mold support portion 210 to support the first opposing surface 30a of the first magnetic member 30 when filling with non-magnetic material and curing. Consequently, plastic deformation of the first magnetic member 30 can be prevented even without selecting a non-magnetic material with high fluidity.Therefore, the selection of non-magnetic materials is not limited, and the stator structure 1 can be manufactured at a reduced cost. Furthermore, this allows the thickness of the first magnetic member 30 to be made thinner. Consequently, the amount of magnetic material used can be reduced, and the stator structure 1 can be manufactured at a reduced cost.

[0094] In the manufacturing method of the stator structure 1 according to Embodiment 1, each lower mold support portion 210 is a protrusion projecting from the wall portion 201a, and with the upper mold 202 positioned relative to the lower mold 201, each lower mold support portion 210 extends from the bottom portion 201b toward the upper mold 202. Furthermore, in the removal process S04, the stator body 10 is moved along the direction in which each lower mold support portion 210 extends, and the stator body 10 is removed from the lower mold 201. In this way, the stator body 10 can be removed from the lower mold 201 by moving the stator body 10 in the direction along which each lower mold support portion 210 extends. Therefore, the removal of the stator body 10 is made easy, and the stator body 10 can be manufactured at a reduced manufacturing cost. In addition, this makes it possible to minimize obstruction of the flow of non-magnetic material in the internal space 220. Therefore, the non-magnetic material can be filled stably, and a high-quality stator structure 1 can be manufactured.

[0095] Modification 1 of Embodiment 1. The stator structure 1 in the modified example 1 of Embodiment 1 differs from the stator structure 1 in that, in addition to one or more first spaces 80 that are in contact with the first opposing surface 30a, it has one or more second spaces 85 that are in contact with the second opposing surface 40a.

[0096] Figure 13 is a schematic diagram showing a tooth portion 12 according to a modified example 1 of Embodiment 1. In Figure 13, a perspective view of one tooth portion 12 is shown as seen from the first magnetic member 30 side.

[0097] A first space 80 or a second space 85 is formed on the side surface of each tip 14 of the stator body 10 in the direction toward the central axis L. Since the configuration of each first space 80 is the same as that of the first space 80 in Embodiment 1, a description is omitted.

[0098] The second magnetic member 40 has a second opposing surface 40a which is the surface facing the first magnetic member 30. That is, the second opposing surface 40a is the surface of the second magnetic member 40 that faces the non-magnetic member 50, and the second opposing surface 40a is the surface of the second magnetic member 40 that faces the first magnetic member 30.

[0099] The stator body 10 has one or more second spaces 85 formed therein. Each second space 85 is formed on the side surface of the tip portion 14 of the corresponding tooth portion 12 in the direction toward the central axis L.

[0100] Each second space 85 is defined in part by a corresponding portion of the second opposing surface 40a of the second magnetic member 40, a corresponding non-magnetic side surface 50s which is a portion of the side surface of the non-magnetic member 50, and a corresponding first side surface 30s which is a portion of the side surface of the first magnetic member 30.

[0101] Each second space 85 extends along the central axis L from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, until it extends beyond the first magnetic member 30. That is, each second space 85 is formed in the non-magnetic member 50 and is in contact with a part of the second opposing surface 40a.

[0102] When viewed along the central axis L, a recessed first retraction portion 30c is formed on the side surface of the first tip portion 34 facing the central axis L. The first side surface 30s is the surface of the first retraction portion 30c and is a surface parallel to the central axis L. That is, the first retraction portion 30c is formed on the side surface of the first tip portion 34 facing the central axis L.

[0103] A non-magnetic retractable portion 50c is formed on the tip side of the non-magnetic tip portion 54 toward the central axis L. The first side surface 30s is a continuous surface with the non-magnetic side surface 50s which is the surface of the corresponding non-magnetic retractable portion 50c. At least a portion of the second space 85 is surrounded and defined by the mutually continuous non-magnetic side surfaces 50s and the first side surface 30s.

[0104] In other words, each second space 85 is composed of a space surrounded by a non-magnetic retraction portion 50c, which is a corresponding recess formed on the side surface of the non-magnetic member 50, and a space surrounded by a first retraction portion 30c, which is a corresponding recess formed on the side surface of the first magnetic member 30.

[0105] Each first space 80 and each second space 85 are alternately arranged in each tooth section 12. That is, of the 14 tooth sections 12, the first space 80 is arranged in 7 of the tooth sections 12, and the second space 85 is arranged in the other 7 tooth sections 12.

[0106] The other components of the stator structure 1 in the modified example 1 of Embodiment 1 are the same as the other components of the stator structure 1 of Embodiment 1, so their description is omitted.

[0107] Next, the method for manufacturing the stator structure 1 in modified example 1 of Embodiment 1 will be described. The method for manufacturing the stator structure 1 according to modified example 1 of Embodiment 1 will also be described based on Figure 6, a flowchart showing the method for manufacturing the stator structure 1 according to Embodiment 1.

[0108] <Preparation process> Each component prepared in preparation step S01, namely the first magnetic member 30, the second magnetic member 40, and the resin mold 200, has already been processed into the desired shape. For example, the first magnetic member 30 prepared by the worker has a first retractable portion 30c formed at the desired first tip 34, and the second magnetic member 40 has a second retractable portion 40c formed at the desired second tip 44. The resin mold 200 will be described later.

[0109] <Placement process> In the arrangement process S02, the second magnetic member 40 and the first magnetic member 30 are placed in the lower mold 201 in that order. Next, the upper mold 202 is placed relative to the lower mold 201.

[0110] Figure 14 is a perspective view showing a part of the resin mold 200 according to Modification 1 of Embodiment 1. In Figure 14, only the portion corresponding to one tooth portion 12 of the resin mold 200 is shown.

[0111] Figure 14 shows a resin mold 200 in which the wall portion 201a defining the tip space 224 has been cut out so that the side surface of the upper mold support portion 215 is visible. Figure 14 shows the resin mold 200 with the first magnetic member 30 and the second magnetic member 40 arranged inside.

[0112] Now, let's describe the resin mold 200. The resin mold 200 further comprises one or more upper mold support parts 215. Each upper mold support part 215 is positioned on the upper mold 202, and with the upper mold 202 positioned on the lower mold 201, each upper mold support part 215 extends from the upper mold 202 toward the bottom part 201b. That is, it extends perpendicularly downward relative to the bottom part 201b.

[0113] Each upper mold support portion 215 has a flat upper mold support end portion 215a formed at its lower end. When the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 is positioned at a desired position on the upper mold 202 corresponding to each first retracted portion 30c of the first magnetic member 30 positioned on the lower mold 201.

[0114] In other words, each upper support portion 215 is positioned in a location corresponding to the space of the tip portion of each tip space 224 toward the center of the annular shape.

[0115] When the upper mold 202 is positioned at the corresponding position on the lower mold 201, the sides of each upper mold support portion 215 positioned on the upper mold 202 are in contact with the wall portion 201a of the lower mold 201. In other words, when the upper mold 202 is positioned relative to the lower mold 201, there is no gap between the sides of each upper mold support portion 215 and the corresponding wall portion 201a.

[0116] In the state where the upper mold 202 is positioned relative to the lower mold 201, each lower mold support 210 and each upper mold support 215 are alternately arranged in adjacent tooth spaces 222. That is, of the 14 tooth spaces 222, the lower mold support 210 is positioned in 7 tooth spaces 222, and the upper mold support 215 is positioned in the other 7 tooth spaces 222.

[0117] The lower mold 201 has each lower mold support portion 210 positioned at a desired location, and each lower mold support portion 210 and each upper mold support portion 215 are positioned so as not to interfere with each other when the upper mold 202 is positioned relative to the lower mold 201. The other configurations of the resin molding die 200 of the modified example 1 of Embodiment 1 are the same as the other configurations of the resin molding die 200 of Embodiment 1, so their description is omitted.

[0118] The explanation of the placement process S02 continues. The worker positions the upper mold 202 relative to the lower mold 201 such that the upper mold support portion 215, which is positioned on the upper mold 202, is inserted into each of the first retractable portions 30c formed on the first magnetic member 30.

[0119] When the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 is positioned to extend into the space of the tip portion toward the center of the yoke space 221, which is an annular space of the corresponding tip space 224. In addition, the first side surface 30s contacts a part of the side surface of the upper mold support portion 215, and a part of the side surface of the upper mold support portion 215 contacts the corresponding wall portion 201a.

[0120] Furthermore, each upper mold support end 215a contacts the second opposing surface 40a, which is the surface of the second magnetic member 40 facing the upper mold 202, and each upper mold support 215 supports the second magnetic member 40. Return to Figure 6 and continue the explanation.

[0121] <Removal process> The worker moves the upper mold 202 relative to the lower mold 201 in a direction along the direction in which each upper mold support 215 extends, removes the upper mold 202, and then removes the stator body 10 from the lower mold 201. This completes the process.

[0122] Each second space 85 formed in the stator body 10 is the location where the corresponding upper mold support portion 215 was present during the placement process S02 and the hardening process S03. During the placement process S02 and the hardening process S03, each upper mold support portion end 215a was in contact with the second opposing surface 40a of the second magnetic member 40, and therefore each second space 85 is in contact with the corresponding second opposing surface 40a of the second magnetic member 40.

[0123] Similarly, in the placement step S02 and the curing step S03, the upper mold 202 was positioned with each upper mold support portion 215 in contact with the corresponding first side surface 30s, so that at least a portion of each second space 85 is defined by the corresponding first side surface 30s and the corresponding non-magnetic side surface 50s. The corresponding first side surface 30s and the corresponding non-magnetic side surface 50s are continuous with each other. The other components of the method for manufacturing the stator structure 1 of the modified example 1 of Embodiment 1 are the same as the other components of the method for manufacturing the stator structure 1 of Embodiment 1, so their description is omitted.

[0124] In the modified example 1 of Embodiment 1, the first side surface 30s is exposed in each second space 85. However, this is not the only option. For example, the first side surface 30s may be covered with a non-magnetic member 50. The configuration may be the same as that of each first space 80 in Embodiment 1 shown in Figure 12. In order to form such a second space 85, in the arrangement step S02, the first magnetic member 30 is arranged such that the first side surface 30s does not come into contact with the upper mold support 215, and a space is formed between the upper mold support 215 and the corresponding first side surface 30s. As a result, the second space 85 is defined only by the non-magnetic member 50. That is, the non-magnetic member 50 may be placed between the second space 85 and the first side surface 30s. If the contact between each upper mold support 215 and the corresponding first side surface 30s is used as the reference for positioning the upper mold 202 relative to the first magnetic member 30, then it is necessary to prepare other positioning references.

[0125] In the modified example 1 of Embodiment 1, the second space 85 extends in a direction along the central axis L. However, it is not limited to this. For example, each upper mold support part 215 does not have to extend in a direction along the central axis L of the stator body 10 when it is positioned on the lower mold 201. As long as the upper mold 202 can be removed without damaging the stator body 10 during the removal process, the direction in which each upper mold support part 215 extends is not particularly limited. Therefore, the second space 85 does not have to extend in a direction along the central axis L.

[0126] In the stator structure 1 according to modification 1 of Embodiment 1, the second magnetic member 40 has a second opposing surface 40a which is the surface facing the first magnetic member 30, and the non-magnetic member 50 has one or more second spaces 85 that are in contact with a part of the second opposing surface 40a. Each second space 85 extends from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, and beyond the first magnetic member 30. Each second space 85 is composed of a space surrounded by a corresponding recess, which is a corresponding non-magnetic retraction portion 50c, and a space surrounded by a corresponding recess, which is a first retraction portion 30c formed on the side surface of the first magnetic member 30. This makes it possible to support the first magnetic member 30 with the lower mold support portion 210 while supporting the second magnetic member 40 beyond the first magnetic member 30 with the upper mold support portion 215. Therefore, plastic deformation of the first magnetic member 30 and the second magnetic member 40 can be effectively prevented. Thus, a stator structure 1 can be obtained that can further prevent a decrease in the detection accuracy of the detection equipment.

[0127] In the stator structure 1 according to modification 1 of Embodiment 1, the second magnetic member 40 has a second opposing surface 40a which is the surface facing the first magnetic member 30, and the non-magnetic member 50 has one or more second spaces 85 which are in contact with a part of the second opposing surface 40a. Each second space 85 extends from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, and beyond the first magnetic member 30. Each second space 85 is composed of a space surrounded by a corresponding non-magnetic retraction portion 50c which is a corresponding recess, and a space surrounded by a corresponding first retraction portion 30c which is a corresponding recess formed on the side surface of the first magnetic member 30. The first magnetic member 30 has a first yoke portion 31 which is annular or part of an annular shape, and a plurality of first teeth portions 32 which extend from the first yoke portion 31 toward the central axis L. Each first retraction portion 30c is formed on the side surface of the corresponding first teeth portion 32 toward the tip in the direction toward the central axis L. Furthermore, each non-magnetic retractable portion 50c is formed on the side surface of the corresponding non-magnetic tooth portion 52 in the direction toward the central axis L. This allows the first tip portion 34 of the first magnetic member 30 to be supported by the lower mold support portion 210, while the second tip portion 44 of the second magnetic member 40 can be supported by the upper mold support portion 215 beyond the first magnetic member 30. Therefore, plastic deformation of the first magnetic member 30 and the second magnetic member 40 can be prevented more effectively. Thus, a stator structure 1 can be obtained that can better prevent a decrease in the detection accuracy of the detection equipment.

[0128] In the stator structure 1 according to modification 1 of Embodiment 1, the first side surface 30s, which is the side surface of each first retractable portion 30c, is exposed to the corresponding second space 85. This allows the upper mold support portion 215 to be aligned with the corresponding first retractable portion 30c, and the upper mold 202 to be positioned relative to the lower mold 201. Therefore, the positioning of the upper mold 202 becomes easier, and the stator structure 1 can be obtained more easily.

[0129] In the stator structure 1 according to the modified example 1 of Embodiment 1, the first side surface 30s, which is the corresponding side surface of each first retractable portion 30c, is covered with a non-magnetic member 50. This allows for a clearance between the upper mold support portion 215 and the corresponding first retractable portion 30c. Consequently, the upper mold 202 can be positioned more smoothly relative to the lower mold 201. Therefore, the manufacturing of the stator body 10 becomes easier, and the manufacturing cost of the stator structure 1 can be reduced.

[0130] The resin mold 200 according to the modified example 1 of Embodiment 1 further comprises one or more upper mold support portions 215 positioned on the upper mold 202. When the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 extends from the upper mold 202 toward the bottom portion 201b, and the side surface of each upper mold support portion 215 is in contact with the corresponding wall portion 201a. Furthermore, when the second magnetic member 40 constituting the stator body 10 is positioned in the internal space 220 and the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 is in contact with the surface of the second magnetic member 40 facing the upper mold 202, thereby supporting the second magnetic member 40. This allows for further support of the second opposing surface 40a of the second magnetic member 40 when filling the resin mold 200 with a non-magnetic material and curing it. Consequently, plastic deformation of the second magnetic member 40 due to the filling of the non-magnetic material under molding pressure P can also be prevented. Therefore, a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection equipment. Furthermore, plastic deformation of the first magnetic member 30 can be prevented without selecting a highly fluid non-magnetic material. Therefore, the selection of non-magnetic materials is not limited, and the manufacturing cost of the stator structure 1 can be reduced. In addition, the thickness of the first magnetic member 30 and the second magnetic member 40 can be made thinner. Therefore, the amount of magnetic material used can be reduced, and the manufacturing cost of the stator structure 1 can be reduced. Furthermore, even if one or more upper mold support parts 215 are provided, the upper mold 202 can be removed from the lower mold 201 by moving each upper mold support part 215 in the direction along its extending direction, and the stator body 10 can be removed from the lower mold 201 by moving the stator body 10 in the direction along its extending direction. Therefore, a resin mold 200 can be obtained that makes it easy to remove the stator body 10 and reduces the manufacturing cost of the stator body 10. Furthermore, this makes it possible to minimize obstruction of the flow of non-magnetic material within the internal space 220, even if an upper mold support portion 215 is also provided. Therefore, the non-magnetic material can be filled stably, and a high-quality stator structure 1 can be obtained.

[0131] In the resin mold 200 according to Modification 1 of Embodiment 1, one or more upper mold support portions 215 are further provided on the upper mold 202. When the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 extends from the upper mold 202 toward the bottom portion 201b and into the space of the tip portion in the direction toward the annular center of the corresponding tooth space 222, and the side surface of each upper mold support portion 215 is in contact with the wall portion 201a that defines the tip portion in the direction toward the annular center of the corresponding tooth space 222. Furthermore, when the second magnetic member 40 constituting the stator body 10 is positioned in the internal space 220 and the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 is in contact with the surface of the second magnetic member 40 facing the upper mold 202 and supports the second magnetic member 40. This allows for the support of the first tip portion 34 of the first tooth portion 32 and the second tip portion 44 of the second tooth portion 42. Therefore, plastic deformation between the first tip portion 34 of the first tooth portion 32 and the second tip portion 44 of the second tooth portion 42 can be efficiently prevented. Thus, a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection device.

[0132] In the manufacturing method of the stator structure 1 according to the modified example 1 of Embodiment 1, the resin mold 200 prepared in the preparation step S01 is placed on the upper mold 202 and further includes one or more upper mold support portions 215 extending from the upper mold 202 toward the bottom portion 201b when the upper mold 202 is placed relative to the lower mold 201. In the placement step S02, when the upper mold 202 is placed relative to the lower mold 201, the side surface of each upper mold support portion 215 contacts the corresponding wall portion 201a, so that each upper mold support portion 215 extends from the upper mold 202 toward the internal space 220. In addition, the surface of the second magnetic member 40 facing the upper mold 202 contacts each upper mold support portion 215, thereby supporting the second magnetic member 40. This makes it possible to support the first opposing surface 30a of the first magnetic member 30 and the second opposing surface 40a of the second magnetic member 40 when filling and curing the non-magnetic material. Therefore, plastic deformation of the first magnetic member 30 and the second magnetic member 40 due to filling with non-magnetic material under molding pressure P can be prevented. Thus, a stator structure 1 that can prevent a decrease in the detection accuracy of the detection equipment can be manufactured. Furthermore, plastic deformation of the first magnetic member 30 and the second magnetic member 40 can be prevented without selecting a highly fluid non-magnetic material. Thus, the selection of non-magnetic materials does not narrow the options, and the stator structure 1 can be manufactured at a reduced cost. In addition, this makes it possible to make the thickness of the first magnetic member 30 and the second magnetic member 40 thinner. Thus, the amount of magnetic material used can be reduced, and the stator structure 1 can be manufactured at a reduced cost. Furthermore, this makes it possible to remove the upper mold 202 from the lower mold 201 by moving the upper mold 202 in the direction along the extending direction of each upper mold support part 215, and to remove the stator body 10 with the hardened non-magnetic material from the lower mold 201 by moving it in the direction along the extending direction of each lower mold support part 210. Therefore, the stator body 10 can be easily removed, and the manufacturing cost of the stator body 10 can be reduced.

[0133] Embodiment 2. The stator structure 1 in Embodiment 2 differs from the stator structure 1 in Embodiment 1 in that each first space 80 is formed on the side surface of the body portion 13. Figure 15 is a schematic diagram showing the teeth portion 12 according to Embodiment 2. Figure 15 shows a perspective view of one teeth portion 12 as seen from the second magnetic member 40 side.

[0134] Each tooth portion 12 has two first spaces 80 formed in its body portion 13. Each body portion 13 has a pair of opposing sides, and one first space 80 is formed on one of the sides. When viewed along the central axis L, each tooth portion 12 is arranged in a line on the inner circumference side of the yoke portion 11, so that two tooth portions 12 of the same shape are arranged on either side of one tooth portion 12.

[0135] Therefore, each of the opposing pairs of sides of each body section 13 faces the body section 13 of the adjacent teeth section 12.

[0136] Figure 16 is a schematic diagram showing a part of the first magnetic member 30 in Figure 15. Figure 17 is a schematic diagram showing a part of the second magnetic member 40 in Figure 15. Similar to each tooth portion 12 and each body portion 13, each first body portion 33 and each second body portion 43 have a pair of opposing sides.

[0137] When viewed along the central axis L, each first tooth portion 32 is arranged side by side on the inner circumference of the first yoke portion 31. Therefore, on both sides of one first tooth portion 32, there are first tooth portions 32 of the same shape. Similarly, when viewed along the central axis L, each second tooth portion 42 is arranged side by side on the inner circumference of the second yoke portion 41. Therefore, on both sides of one second tooth portion 42, there are second tooth portions 42 of the same shape.

[0138] Therefore, each of the opposing pairs of sides of each first body section 33 faces each of the first body sections 33 of the adjacent first teeth sections 32. Similarly, each of the opposing pairs of sides of each second body section 43 faces each of the second body sections 43 of the adjacent second teeth sections 42.

[0139] Each second retractable portion 40c is formed on a pair of sides of the second body portion 43 of the second teeth portion 42. As shown in Figure 16, the first magnetic member 30 does not have recesses corresponding to the second retractable portions 40c.

[0140] Returning to Figure 15, let's continue the explanation. Similar to each body section 13, each non-magnetic body section 53 has a pair of opposing sides. When viewed along the central axis L, each non-magnetic tooth section 52 is arranged side by side on the inner circumference of the non-magnetic yoke section 51. Therefore, on both sides of one non-magnetic tooth section 52, there are non-magnetic tooth sections 52 of the same shape.

[0141] Therefore, each of the opposing pairs of sides of each non-magnetic body portion 53 faces each of the non-magnetic body portions 53 of the non-magnetic teeth portions 52 located on either side. Each second retractable portion 40c is formed on the pair of sides of the non-magnetic body portion 53 of the non-magnetic teeth portion 52.

[0142] Non-magnetic retractable portions 50c are formed on each of the pair of sides of the non-magnetic body portion 53. The other components of the stator structure 1 of Embodiment 2 are the same as the other components of the stator structure 1 of Embodiment 1, so their description is omitted.

[0143] Next, the method for manufacturing the stator structure 1 in Embodiment 2 will be described. The method for manufacturing the stator structure 1 in Embodiment 2 will also be explained using the flowchart in Figure 6, which shows the method for manufacturing the stator structure 1 according to Embodiment 1.

[0144] <Preparation process> In preparation step S01, the second magnetic member 40 is prepared with a second retractable portion 40c formed on each of the two opposing sides of each second body portion 43. In the lower mold 201 of the resin molding die 200 prepared in preparation step S01, each lower mold support portion 210 is formed and arranged on a pair of opposing wall portions 201a that define the corresponding tooth space 222, or more specifically, the body space 223.

[0145] Each lower mold support portion 210 is positioned to correspond to each second retracted portion 40c of the second magnetic member 40 arranged on the lower mold 201. That is, each lower mold support portion 210 is formed and positioned as a convex shape protruding from each pair of opposing wall portions 201a that define each body space 223 of each tooth space 222.

[0146] The other components of the resin mold 200 in Embodiment 2 are the same as the other components of the resin mold 200 in Embodiment 1, so their description will be omitted.

[0147] <Placement process> Let's continue the explanation of the placement process S02. After the upper mold 202 is placed relative to the lower mold 201, the internal space 220 is filled with a non-magnetic material. Figure 18 is a conceptual diagram of filling the resin mold 200 with a non-magnetic material in Embodiment 2. In Figure 18, the upper mold 202 and the lower mold 201 are not shown.

[0148] The operator pours the non-magnetic material into the internal space 220 from an inlet (not shown) and fills the resin mold 200 with the non-magnetic material. When pouring the non-magnetic material, a molding pressure P is applied to the material. This allows the non-magnetic material to be poured into every corner of the internal space 220 of the resin mold 200.

[0149] At this time, the teeth portion of the first magnetic member 30 is positioned in contact with the lower mold support end 210a of the lower mold support portion 210, so it does not bend in the direction toward the second magnetic member 40. The other components of the method for manufacturing the stator structure 1 according to Embodiment 2 are the same as the other components of the method for manufacturing the stator structure 1 according to Embodiment 1, so their description is omitted.

[0150] In the embodiment 2, two first spaces 80 are formed in each body portion 13. However, this is not the only option. Only one first space 80 may be formed in each body portion 13. Alternatively, two first spaces 80 may be formed in one body portion 13, and one first space 80 may be formed in another body portion 13. Each first space 80 can be designed to be in an optimal position as appropriate, depending on the manufacturing of the resin mold 200 and the strength of the first magnetic member 30.

[0151] Furthermore, in Embodiment 2, the second side surface 40s is exposed in each first space 80. However, this is not the only configuration. For example, as shown in Figure 12, the second side surface 40s may be covered with a non-magnetic member 50, similar to the configuration in Embodiment 1.

[0152] In the stator structure 1 according to Embodiment 2, the second magnetic member 40 has a second yoke portion 41 which is annular or part of an annular shape, and a plurality of second teeth portions 42 which extend from the second yoke portion 41 toward the central axis L. The non-magnetic member 50 has a non-magnetic yoke portion 51 which is annular or part of an annular shape, and a plurality of non-magnetic teeth portions 52 which extend from the non-magnetic yoke portion 51 toward the central axis L. Each second teeth portion 42 has a pair of sides facing each of the adjacent second teeth portions 42. Each non-magnetic teeth portion 52 has a pair of sides facing each of the adjacent non-magnetic teeth portions 52. Each second retractable portion 40c is formed on at least one of the pair of sides of the corresponding second teeth portion 42. Each non-magnetic retractable portion 50c is formed on at least one of the pair of sides of the corresponding non-magnetic teeth portion 52. This allows the first tooth portion 32 of the first magnetic member 30, located near the first yoke portion 31, to be supported by the lower mold support portion 210. Consequently, the first magnetic member 30 can be supported more firmly, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that prevents a decrease in the detection accuracy of the detection equipment.

[0153] In the resin mold 200 according to Embodiment 2, the internal space 220 is composed of a yoke space 221, which is an annular space, and one or more tooth spaces 222, which are spaces extending from the yoke space 221 toward the center of the annulus. Furthermore, the wall portion 201a from which each lower mold support portion 210 protrudes is at least one of a pair of opposing wall portions 201a that define the corresponding tooth space 222. This allows the first tooth portion 32 of the first magnetic member 30, which is located close to the first yoke portion 31, to be supported by the lower mold support portion 210. Therefore, the first magnetic member 30 can be supported more firmly, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that can prevent a decrease in the detection accuracy of the detection equipment.

[0154] Modification 1 of Embodiment 2. The stator structure 1 in the modified example 1 of Embodiment 2 differs from the stator structure 1 in Embodiment 2 in that, in addition to the first space 80 that is in contact with the first opposing surface 30a, it has a second space 85 that is in contact with the second opposing surface 40a.

[0155] Figure 19 is a schematic diagram showing a tooth portion 12 according to a modified example 1 of Embodiment 2. In Figure 19, a perspective view of one tooth portion 12 is shown from the first magnetic member 30 side.

[0156] Of the stator body 10, a first space 80, as shown in Figure 15, is formed on each of the opposing pairs of sides of at least one body 13, and a second space 85, as shown in Figure 19, is formed on each of the opposing pairs of sides of at least one body 13.

[0157] Each second space 85 is defined in part by a corresponding portion of the second opposing surface 40a of the second magnetic member 40, a corresponding non-magnetic side surface 50s which is a portion of the side surface of the non-magnetic member 50, and a corresponding first side surface 30s which is a portion of the side surface of the first magnetic member 30.

[0158] In other words, the second space 85 extends along the central axis L from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, until it extends beyond the first magnetic member 30.

[0159] Here, the second opposing surface 40a is the surface of the second magnetic member 40 that faces the non-magnetic member 50 and simultaneously faces the first magnetic member 30. The second space 85 is in contact with the corresponding portion of the second opposing surface 40a.

[0160] When viewed along the central axis L, a first retractable portion 30c, which is a recess, is formed on each of the pair of side surfaces facing the adjacent first body portion 33. The first side surface 30s is the surface of the corresponding first retractable portion 30c and is a surface parallel to the central axis L. That is, a first retractable portion 30c is formed on each of the pair of side surfaces facing the adjacent first body portion 33.

[0161] On each of the pair of sides of the non-magnetic body portion 53 that are adjacent to the non-magnetic body portion 53, a non-magnetic retraction portion 50c, which is a recess, is formed. The first side surface 30s is a surface continuous with the non-magnetic side surface 50s, which is the surface of the corresponding non-magnetic retraction portion 50c. The mutually continuous non-magnetic side surfaces 50s and the first side surface 30s surround and define at least a portion of the second space 85.

[0162] In other words, each second space 85 is composed of a space surrounded by a non-magnetic retraction portion 50c, which is a corresponding recess formed on the side surface of the non-magnetic member 50, and a space surrounded by a first retraction portion 30c, which is a corresponding recess formed on the side surface of the first magnetic member 30.

[0163] Each first space 80 and each second space 85 are alternately arranged in each tooth section 12. That is, of the 14 tooth sections 12, the first space 80 is arranged in 7 of the tooth sections 12, and the second space 85 is arranged in the other 7 tooth sections 12.

[0164] The other components of the stator structure 1 in the modified example 1 of Embodiment 2 are the same as the other components of the stator structure 1 of Embodiment 2, so their description is omitted.

[0165] Next, the method for manufacturing the stator structure 1 in modified example 1 of Embodiment 2 will be described. The method for manufacturing the stator structure 1 according to modified example 1 of Embodiment 1 will also be described based on Figure 6, a flowchart showing the method for manufacturing the stator structure 1 according to Embodiment 1.

[0166] <Preparation process> In preparation step S01, a first magnetic member 30, a second magnetic member 40, a resin mold 200, and a non-magnetic material are prepared. The first magnetic member 30 prepared in preparation step S01 has a first retractable portion 30c formed on a desired first body portion 33, and the second magnetic member 40 has a second retractable portion 40c formed on a desired second body portion 43.

[0167] The resin mold 200 prepared in preparation step S01 further comprises one or more upper mold support parts 215. Each upper mold support part 215 is positioned at a desired position on the upper mold 202 corresponding to each first retracted part 30c of the first magnetic member 30 that is positioned on the lower mold 201 when the upper mold 202 is positioned on the lower mold 201.

[0168] In Modification 1 of this second embodiment, each first retractable portion 30c is formed on the corresponding side of a pair of sides of each first body portion 33. Thus, when the upper mold 202 is positioned relative to the lower mold 201 to close the internal space 220, each upper mold support portion 215 is formed and positioned on the upper mold 202 such that the side of each upper mold support portion 215 contacts a pair of opposing wall portions 201a that define the corresponding tooth space 222, more specifically, the body space 223 of the corresponding tooth space 222.

[0169] The other configurations of the upper mold 202 in the modified example 1 of Embodiment 2 are the same as the other configurations of the upper mold 202 in the modified example 1 of Embodiment 1, so their description is omitted. The other configurations of the lower mold 201 in the modified example 1 of Embodiment 2 are the same as the other configurations of the lower mold 201 in Embodiment 2, so their description is omitted.

[0170] <Placement process> The second magnetic member 40 and the first magnetic member 30 are arranged in this order on the lower mold 201. Next, the upper mold 202 is placed on the lower mold 201.

[0171] The worker positions the upper mold 202 relative to the lower mold 201 such that the upper mold support portion 215, which is positioned on the upper mold 202, is inserted into each first retractable portion 30c formed in the first magnetic member 30. When the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 is positioned to extend into the corresponding body space 223.

[0172] Furthermore, a portion of the side surface of each upper mold support portion 215 contacts the first side surface 30s, and a portion of the side surface of each upper mold support portion 215 contacts the corresponding wall portion 201a that defines the corresponding body space 223. In addition, each end portion 215a of the upper mold support portion contacts the corresponding second opposing surface 40a.

[0173] <Removal process> The worker moves the upper mold 202 relative to the lower mold 201 in a direction along the direction in which each upper mold support 215 extends, removes the upper mold 202, and then removes the stator body 10 from the lower mold 201. This completes the process.

[0174] Each second space 85 formed in the stator body 10 is the location where the corresponding upper mold support portion 215 was present during the placement process S02 and the hardening process S03. During the placement process S02 and the hardening process S03, the upper mold 202 is positioned such that each upper mold support end 215a contacts the corresponding portion of the second opposing surface 40a of the second magnetic member 40. Therefore, each second space 85 is in contact with the corresponding portion of the second opposing surface 40a of the second magnetic member 40.

[0175] Furthermore, in the placement step S02 and the curing step S03, the upper mold 202 was positioned such that each upper mold support portion 215 contacts the corresponding first side surface 30s, so that at least a portion of each second space 85 is defined by the corresponding first side surface 30s and the corresponding non-magnetic side surface 50s. The corresponding first side surface 30s and the corresponding non-magnetic side surface 50s are continuous with each other. The other components of the manufacturing method of the stator structure 1 in the modified example 1 of Embodiment 2 are the same as the other components of the manufacturing method of the stator structure 1 in Embodiment 2, so their description is omitted.

[0176] In the modified example 1 of Embodiment 2, the second space 85 extends in a direction along the central axis L. However, it is not limited to this. For example, each upper mold support part 215 does not have to extend in a direction along the central axis L of the stator body 10 when it is positioned on the lower mold 201. As long as the upper mold 202 can be removed without damaging the stator body 10 during the removal process, the direction in which each upper mold support part 215 extends is not particularly limited. Therefore, the second space 85 does not have to extend in a direction along the central axis L.

[0177] Furthermore, in the modified example 1 of Embodiment 2, the first side surface 30s is exposed in each second space 85. However, this is not the only option. For example, a configuration similar to the modified example 1 of Embodiment 1, where the first side surface 30s is covered with a non-magnetic member 50, can be adopted, as shown in Figure 12.

[0178] In the stator structure 1 according to the modified example 1 of Embodiment 2, the second magnetic member 40 has a second opposing surface 40a which is the surface facing the first magnetic member 30, and the non-magnetic member 50 has one or more second spaces 85 which are in contact with a part of the second opposing surface 40a. Each second space 85 extends from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, and beyond the first magnetic member 30. Each second space 85 is composed of a space surrounded by a corresponding non-magnetic retraction portion 50c which is a corresponding recess, and a space surrounded by a corresponding first retraction portion 30c which is a corresponding recess formed on the side surface of the first magnetic member 30. The first magnetic member 30 has a first yoke portion 31 which is annular or part of an annular shape, and a plurality of first teeth portions 32 which extend from the first yoke portion 31 toward the central axis L. Each first teeth portion 32 has a pair of sides which face each of the adjacent first teeth portions 32. Furthermore, each first retractable portion 30c is formed on at least one of a pair of sides of the corresponding first tooth portion 32. Similarly, each non-magnetic retractable portion 50c is formed on at least one of a pair of sides of the corresponding non-magnetic tooth portion 52. This allows the first tooth portion 32 of the first magnetic member 30, located near the first yoke portion 31, to be supported by the lower mold support portion 210, and the second tooth portion 42 of the second magnetic member 40, located near the second yoke portion 41, to be supported by the upper mold support portion 215. Consequently, the first magnetic member 30 and the second magnetic member 40 can be supported more firmly, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that can prevent a decrease in the detection accuracy of the detection equipment.

[0179] In the resin mold 200 according to Modification 1 of Embodiment 2, the upper mold 202 is further provided with one or more upper mold support portions 215, and when the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 extends from the upper mold 202 toward the bottom portion 201b and toward the corresponding tooth space 222. In addition, the side surface of each upper mold support portion 215 is in contact with at least one wall portion 201a of a pair of opposing wall portions 201a that define the corresponding tooth space 222. Furthermore, when the second magnetic member 40 constituting the stator body 10 is positioned in the internal space 220 and the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 is in contact with the surface of the second magnetic member 40 facing the upper mold 202 and supports the second magnetic member 40. As a result, the first tooth portion 32, which is located near the first yoke portion 31, can be supported by the lower mold support portion 210, and the second tooth portion 42, which is located near the second yoke portion 41, can be supported by the upper mold support portion 215. Therefore, the first magnetic member 30 and the second magnetic member 40 can be supported more firmly, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that can prevent a decrease in the detection accuracy of the detection equipment.

[0180] Embodiment 3. The stator structure 1 in Embodiment 3 differs from the stator structure 1 in Embodiment 2 in that each first space 80 is formed as a hole in a part other than the side surface of the body portion 13. Figure 20 is a schematic diagram showing the teeth portion 12 according to Embodiment 3. Figure 20 shows a perspective view of one teeth portion 12 as seen from the second magnetic member 40 side.

[0181] A first space 80 is formed in the body portion 13 of each tooth portion 12. The first space 80 formed in each body portion 13 is not exposed to any side of the corresponding body portion 13.

[0182] Figure 21 is a schematic diagram showing a part of the first magnetic member 30 in Figure 20. Figure 22 is a schematic diagram showing a part of the second magnetic member 40 in Figure 20. When viewed along the central axis L, each second body portion 43 has a second retractable portion 40c formed thereon, which is a hole that extends around the entire circumference.

[0183] As shown in Figure 21, the first magnetic member 30 does not have a hole corresponding to the second retracted portion 40c.

[0184] Returning to Figure 20, the explanation continues. When viewed along the central axis L, each non-magnetic body portion 53 has a non-magnetic retraction portion 50c formed thereon, which is a hole that extends around its entire circumference. Each non-magnetic side surface 50s is the surface of the corresponding non-magnetic retraction portion 50c and is a plane parallel to the central axis L. Each non-magnetic retraction portion 50c extends in the direction along the central axis L.

[0185] Each first space 80 is composed of a space surrounded by a non-magnetic retraction portion 50c, which is a corresponding hole formed in the non-magnetic member 50, and a space surrounded by a second retraction portion 40c, which is a corresponding hole formed in the second magnetic member 40. The other configurations of the stator structure 1 of Embodiment 3 are the same as the other configurations of the stator structure 1 of Embodiment 2, so their description is omitted.

[0186] Next, the method for manufacturing the stator structure 1 in Embodiment 3 will be described. The method for manufacturing the stator structure 1 in Embodiment 3 will also be explained using the flowchart in Figure 6, which shows the method for manufacturing the stator structure 1 according to Embodiment 1.

[0187] <Preparation process> In preparation step S01, a second magnetic member 40 is prepared in which a second retractable portion 40c is formed in each second body portion 43. Also in preparation step S01, a resin molding die 200 is prepared having a lower mold 201 in which each lower mold support portion 210 is positioned to protrude from the bottom portion 201b.

[0188] Figure 23 is a perspective view showing the lower mold 201 according to Embodiment 3. In Figure 23, a portion of the lower mold 201 corresponding to one tooth portion 12 is shown, that is, a portion of the lower mold 201 cut along a line surrounding one tooth space 222.

[0189] Columnar lower mold support parts 210 are formed and positioned on the lower mold 201. Each lower mold support part 210 is formed and positioned independently without contacting the wall part 201a.

[0190] Each lower mold support portion 210 extends from the bottom portion 201b toward the upper mold 202 when the upper mold 202 is positioned on the lower mold 201. That is, each lower mold support portion 210 extends vertically upward relative to the bottom portion 201b. Each lower mold support portion 210 is positioned at a location corresponding to the second retraction portion 40c, which is a hole formed in each second body portion 43, when the second magnetic member 40 is positioned in the internal space 220.

[0191] That is, each lower mold support portion 210 is formed and positioned in the body space 223 of the corresponding tooth space 222. The other configurations of the resin mold 200 of Embodiment 3 are the same as the other configurations of the resin mold 200 of Embodiment 1, so their description will be omitted. Return to Figure 6 and continue the explanation.

[0192] <Placement process> The second magnetic member 40 is positioned on the lower mold 201 such that each lower mold support portion 210 is inserted into the corresponding hole, which is the second retraction portion 40c. Next, the first magnetic member 30 is positioned on each lower mold support portion 210, the upper mold 202 is positioned relative to the lower mold 201, and the internal space 220 is filled with a non-magnetic material.

[0193] The other components of the method for manufacturing the stator structure 1 according to Embodiment 3 are the same as the other components of the method for manufacturing the stator structure 1 according to Embodiment 1, so their description will be omitted.

[0194] In the removed stator body 10, each non-magnetic body portion 53 of the hardened non-magnetic material has a non-magnetic retractable portion 50c formed thereon, corresponding to the lower mold support portion 210. The non-magnetic retractable portion 50c is formed along the direction of the central axis L, and its surface is a non-magnetic side surface 50s. The second side surface 40s and the non-magnetic side surface 50s define the outer circumferential surface of the corresponding first space 80 along the direction of the central axis L of the first space 80.

[0195] In Embodiment 3, the second side surface 40s is exposed in each first space 80, which is a hole. However, this is not the only configuration. For example, as shown in Figure 12, a configuration similar to Embodiment 1 may be adopted in which the second side surface 40s is covered with a non-magnetic member 50.

[0196] Furthermore, each first space 80 described in Embodiment 3 is formed in one body section 13. However, it is not limited to this. Two or more first spaces 80 may be formed in each body section 13. This allows for more robust support of the second teeth section 42. Also, it is not necessary to place a first space 80 in all body sections 13. The first spaces 80 may be appropriately selected and placed in the corresponding body sections 13. This allows for optimal support of the second teeth section 42.

[0197] Furthermore, the lower mold support portion 210 in Embodiments 1, 2, and 3 is a part of a cylinder or a cylinder. However, it is not limited to this. For example, it may be a column with an elliptical cross-section, a rectangular prism, or a conical column, or a part of a column.

[0198] Furthermore, the lower mold support portion 210 in Embodiments 1, 2, and 3 has a lower mold support portion end 210a which is a surface. However, it is not limited to this. For example, the upper end of the lower mold support portion 210 may have a tapered shape, and the lower mold support portion end 210a may be formed as a point or line rather than a surface. In other words, as long as the lower mold support portion end 210a can contact the first opposing surface 30a of the first magnetic member 30 at a set position and support the first magnetic member 30, the shape of the lower mold support portion end 210a can be any shape.

[0199] In the stator structure 1 according to Embodiment 3, each first space 80 is composed of a space surrounded by a non-magnetic retraction portion 50c, which is a corresponding hole formed in the non-magnetic member 50, and a space surrounded by a second retraction portion 40c, which is a corresponding hole formed in the second magnetic member 40. This allows the first magnetic member 30 to be supported by the lower mold support portion 210, which penetrates the second magnetic member 40 placed on the lower mold 201. Therefore, the first magnetic member 30 can be supported more firmly in a suitable position, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that can prevent a decrease in the detection accuracy of the detection equipment while reducing manufacturing costs by optimizing the number of lower mold support portions 210.

[0200] In the stator structure 1 according to Embodiment 3, the second magnetic member 40 has a second yoke portion 41 that is annular or part of an annular shape, and a plurality of second teeth portions 42 extending from the second yoke portion 41 toward the central axis L. The non-magnetic member 50 also has a non-magnetic yoke portion 51 that is annular or part of an annular shape, and a plurality of non-magnetic teeth portions 52 extending from the non-magnetic yoke portion 51 toward the central axis L. Each second retractable portion 40c is formed on the corresponding second teeth portion 42. Each non-magnetic retractable portion 50c is formed on the corresponding non-magnetic teeth portion 52. This allows the first teeth portion 32 of the first magnetic member 30 to be supported. Therefore, areas prone to plastic deformation can be appropriately supported, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that optimizes the number of lower mold support portions 210 to reduce manufacturing costs while preventing a decrease in the detection accuracy of the detection equipment.

[0201] In the resin mold 200 according to Embodiment 3, with the upper mold 202 positioned relative to the lower mold 201, each lower mold support portion 210 extends from the bottom portion 201b toward the upper mold 202 without contacting the wall portion 201a. This allows the stator body 10, in its hardened state of non-magnetic material, to be removed from the lower mold 201 by moving it in the direction along the extending direction of each lower mold support portion 210. Therefore, a resin mold 200 can be obtained that facilitates the removal of the stator body 10 and reduces the manufacturing cost of the stator body 10. Furthermore, this allows the first magnetic member 30 to be supported by the lower mold support portion 210 that penetrates the second magnetic member 40 positioned in the lower mold 201. Therefore, the first magnetic member 30 can be more firmly supported in a suitable position, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that optimizes the number of lower mold support portions 210 to reduce manufacturing costs while preventing a decrease in the detection accuracy of the detection equipment.

[0202] In the resin mold 200 according to Embodiment 3, the internal space 220 is composed of a yoke space 221 which is an annular space, and one or more tooth spaces 222 which are spaces extending from the yoke space 221 toward the center of the annulus, and each lower mold support part 210 is positioned in the corresponding tooth space 222. This allows the first tooth portion 32 of the first magnetic member 30 to be supported. Therefore, areas prone to plastic deformation can be appropriately supported, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that optimizes the number of lower mold support parts 210 to reduce manufacturing costs while preventing a decrease in the detection accuracy of the detection equipment.

[0203] In the manufacturing method of the stator structure 1 according to Embodiment 3, each lower mold support portion 210 is not in contact with the wall portion 201a, and with the upper mold 202 positioned relative to the lower mold 201, each lower mold support portion 210 extends from the bottom portion 201b toward the upper mold 202. Furthermore, in the removal process S04, the stator body 10 is moved along the direction in which each lower mold support portion 210 extends, and the stator body 10 is removed from the lower mold 201. As a result, by moving in the direction along the direction in which each lower mold support portion 210 extends, the stator body 10, in a hardened state of the non-magnetic material, can be removed from the lower mold 201. Therefore, the removal of the stator body 10 becomes easy, and a resin mold 200 can be obtained that can reduce the manufacturing cost of the stator body 10. Furthermore, as a result, the first magnetic member 30 can be supported by the lower mold support portion 210 that penetrates the second magnetic member 40 positioned in the lower mold 201. Therefore, the first magnetic member 30 can be more firmly supported in a suitable position, and plastic deformation can be effectively prevented. Thus, by optimizing the number of lower mold support parts 210, it is possible to manufacture a stator structure 1 that can reduce manufacturing costs while preventing a decrease in the detection accuracy of the detection equipment.

[0204] Modification 1 of Embodiment 3. The stator structure 1 in the modified example 1 of Embodiment 3 differs from the stator structure 1 in Embodiment 3 in that, in addition to the first space 80 that is in contact with the first opposing surface 30a, it has a second space 85 that is in contact with the second opposing surface 40a.

[0205] Figure 24 is a schematic diagram showing a tooth portion 12 according to a modified example 1 of Embodiment 3. In Figure 24, a perspective view of one tooth portion 12 is shown as seen from the first magnetic member 30 side.

[0206] Each shell portion 13 of the stator body 10 has either a first space 80 or a second space 85 formed within it. The first space 80 and the second space 85 formed within each shell portion 13 are not exposed to any side of the corresponding shell portion 13.

[0207] Each second space 85 is defined in part by a corresponding portion of the second opposing surface 40a of the second magnetic member 40, a corresponding non-magnetic side surface 50s which is a portion of the side surface of the non-magnetic member 50, and a corresponding first side surface 30s which is a portion of the side surface of the first magnetic member 30.

[0208] In other words, the second space 85 extends along the central axis L from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, until it extends beyond the first magnetic member 30.

[0209] Here, the second opposing surface 40a is the surface of the second magnetic member 40 facing the non-magnetic member 50, and the second opposing surface 40a is the surface of the second magnetic member 40 facing the first magnetic member 30. That is, the second space 85 is in contact with the corresponding portion of the second opposing surface 40a.

[0210] When viewed along the central axis L, the first body portion 33 has a first retractable portion 30c formed in it, which is a hole that extends around the entire circumference.

[0211] The first side surface 30s is the surface of the corresponding first retraction portion 30c and is a surface parallel to the central axis L. That is, the first body portion 33 has a hole, the first retraction portion 30c, that extends along the central axis L. The second magnetic member 40 does not have a hole corresponding to the first retraction portion 30c.

[0212] When viewed along the central axis L, the non-magnetic body portion 53 has a non-magnetic retraction portion 50c formed thereon, which is a hole that extends around its entire circumference. The first side surface 30s is a surface continuous with the non-magnetic side surface 50s, which is the surface of the corresponding non-magnetic retraction portion 50c. The mutually continuous non-magnetic side surfaces 50s and the first side surface 30s surround and define at least a portion of the second space 85.

[0213] In other words, each second space 85 is composed of a space surrounded by a non-magnetic retraction portion 50c, which is a corresponding hole formed in the non-magnetic member 50, and a space surrounded by a first retraction portion 30c, which is a corresponding hole formed in the first magnetic member 30.

[0214] Each first space 80 and each second space 85 are alternately arranged in each tooth section 12. That is, of the 14 tooth sections 12, the first space 80 is arranged in 7 of the tooth sections 12, and the second space 85 is arranged in the other 7 tooth sections 12.

[0215] The other components of the stator structure 1 in the modified example 1 of Embodiment 3 are the same as the other components of the stator structure 1 of Embodiment 3, so their description is omitted.

[0216] Next, the method for manufacturing the stator structure 1 in modified example 1 of Embodiment 3 will be described. The method for manufacturing the stator structure 1 according to modified example 1 of Embodiment 3 will also be described based on Figure 6, a flowchart showing the method for manufacturing the stator structure 1 according to Embodiment 1.

[0217] <Preparation process> In preparation step S01, a first magnetic member 30, a second magnetic member 40, a resin mold 200, and a non-magnetic material are prepared. The first magnetic member 30 prepared in preparation step S01 has a first retractable portion 30c formed on a desired first body portion 33, and the second magnetic member 40 has a second retractable portion 40c formed on a desired second body portion 43.

[0218] The resin mold 200 prepared in preparation step S01 further comprises one or more upper mold support parts 215. With the upper mold 202 positioned on the lower mold 201, each upper mold support part 215 extends from the upper mold 202 toward the bottom 201b. That is, each upper mold support part 215 is positioned on the upper mold 202, extending vertically downward relative to the bottom 201b.

[0219] Each first retractable section 30c is formed on the corresponding side of a pair of sides of each first body section 33. Thus, when the upper mold 202 is positioned on the lower mold 201, each upper mold support section 215 is formed and positioned on the upper mold 202 so as to extend into the corresponding tooth space 222, and more specifically into the body space 223 of the corresponding tooth space 222.

[0220] Since each first retractable portion 30c formed in the first magnetic member 30 is a hole, it does not come into contact with the pair of sides of the first body portion 33. Therefore, when the upper mold 202 is positioned relative to the lower mold 201, the upper mold support portion 215 does not come into contact with any of the wall portions 201a.

[0221] Furthermore, each lower mold support portion 210 is positioned on the lower mold 201 at a desired location. Here, each lower mold support portion 210 and each upper mold support portion 215 are positioned so as not to interfere with each other when the upper mold 202 is placed on the lower mold 201.

[0222] The other configurations of the lower mold 201 in the modified example 1 of Embodiment 3 are the same as those of the lower mold 201 in Embodiment 3, so their description is omitted. The other configurations of the upper mold 202 in the modified example 1 of Embodiment 3 are the same as those of the upper mold 202 in the modified example 1 of Embodiment 1, so their description is omitted. Returning to Figure 6, the explanation continues.

[0223] <Placement process> The worker places the second magnetic member 40 and the first magnetic member 30 in that order on the lower mold 201. Next, the worker places the upper mold 202 on the lower mold 201.

[0224] The worker positions the upper mold 202 relative to the lower mold 201 such that the corresponding upper mold support portion 215, which is positioned on the upper mold 202, is inserted into each first retractable portion 30c formed on the first magnetic member 30. When the upper mold 202 is positioned relative to the lower mold 201, the first side surface 30s corresponding to the side surface of each upper mold support portion 215 is in contact, and the end 215a of each upper mold support portion is in contact with the second opposing surface 40a. In addition, each upper mold support portion 215 extends from the upper mold 202 into the tooth space 222 of the internal space 220 without contacting the wall portion 201a.

[0225] <Removal process> The worker moves the upper mold 202 relative to the lower mold 201 in a direction along the direction in which each upper mold support 215 extends, removes the upper mold 202, and then removes the stator body 10 from the lower mold 201. This completes the process.

[0226] Each second space 85 formed in the stator body 10 is the location where the corresponding upper mold support portion 215 was present during the placement process S02 and the hardening process S03. During the placement process S02 and the hardening process S03, the upper mold 202 is positioned such that each upper mold support end 215a contacts the corresponding portion of the second opposing surface 40a of the second magnetic member 40. Therefore, each second space 85 is in contact with the corresponding portion of the second opposing surface 40a of the second magnetic member 40.

[0227] Furthermore, in the arrangement step S02 and the curing step S03, the upper mold 202 was positioned such that each upper mold support portion 215 contacts the corresponding first side surface 30s. As a result, in the formed stator body 10, at least a portion of each second space 85 is defined by the corresponding first side surface 30s and the corresponding non-magnetic side surface 50s. The corresponding first side surface 30s and the corresponding non-magnetic side surface 50s are continuous with each other. The other components of the manufacturing method of the stator structure 1 in the modified example 1 of Embodiment 3 are the same as the other components of the manufacturing method of the stator structure 1 in Embodiment 3, so their description is omitted.

[0228] In the modified example 1 of Embodiment 3, the first side surface 30s is exposed in each second space 85, which is a hole. However, this is not the only option. For example, a configuration similar to the modified example 1 of Embodiment 1, in which the first side surface 30s is covered with a non-magnetic member 50, can be adopted, as shown in Figure 12.

[0229] Furthermore, in the modified example 1 of Embodiment 3, the second space 85 extends in a direction along the central axis L. However, it is not limited to this. For example, each upper mold support portion 215 does not have to extend in a direction along the central axis L of the stator body 10 when it is positioned on the lower mold 201. As long as the upper mold 202 can be removed without damaging the stator body 10 during the removal process, the direction in which each upper mold support portion 215 extends is not particularly limited. Therefore, the second space 85 does not have to extend in a direction along the central axis L.

[0230] In the stator structure 1 according to the modified example 1 of Embodiment 3, the second magnetic member 40 has a second opposing surface 40a which is the surface facing the first magnetic member 30, and the non-magnetic member 50 has one or more second spaces 85 which are in contact with a part of the second opposing surface 40a. Each second space 85 extends from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, and beyond the first magnetic member 30. Each second space 85 is composed of a space surrounded by a non-magnetic retraction portion 50c which is a corresponding hole formed in the non-magnetic member 50, and a space surrounded by a first retraction portion 30c which is a corresponding hole formed in the first magnetic member 30. As a result, the first magnetic member 30 can be supported by the lower mold support portion 210 which penetrates the second magnetic member 40 placed on the lower mold 201, and the second magnetic member 40 can be supported by each upper mold support portion 215 which penetrates the first magnetic member 30 placed on the lower mold 201. Therefore, the first magnetic member 30 and the second magnetic member 40 can be more firmly supported in a suitable position, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that optimizes the number of lower mold support parts 210 and upper mold support parts 215, reduces manufacturing costs, and prevents a decrease in the detection accuracy of the detection equipment.

[0231] In the stator structure 1 according to the modified example 1 of Embodiment 3, the second magnetic member 40 has a second opposing surface 40a which is the surface facing the first magnetic member 30, and the non-magnetic member 50 has one or more second spaces 85 which are in contact with a part of the second opposing surface 40a. Each second space 85 extends from the second opposing surface 40a across the non-magnetic member 50 and the first magnetic member 30, and beyond the first magnetic member 30. Each second space 85 is composed of a space surrounded by a non-magnetic retraction portion 50c which is a corresponding hole formed in the non-magnetic member 50, and a space surrounded by a first retraction portion 30c which is a corresponding hole formed in the first magnetic member 30. The first magnetic member 30 has a first yoke portion 31 which is annular or part of an annular shape, and a plurality of first teeth portions 32 which extend from the first yoke portion 31 toward the central axis L. Each first retraction portion 30c is formed in the corresponding first teeth portion 32. Furthermore, each non-magnetic retractable portion 50c is formed on the corresponding non-magnetic tooth portion 52. This allows the lower mold support portion 210, which penetrates the second magnetic member 40 positioned on the lower mold 201, to support the first tooth portion 32 of the first magnetic member 30. In addition, each upper mold support portion 215, which penetrates the first magnetic member 30 positioned on the lower mold 201, can support the second tooth portion 42 of the second magnetic member 40. Therefore, areas prone to plastic deformation can be appropriately supported, and plastic deformation can be effectively prevented. Thus, a stator structure 1 can be obtained that optimizes the number of lower mold support portions 210 and upper mold support portions 215, reduces manufacturing costs, and prevents a decrease in the detection accuracy of the detection equipment.

[0232] In the resin mold 200 according to the modification 1 of Embodiment 3, one or more upper mold support portions 215 are further provided on the upper mold 202. Furthermore, when the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 extends toward the internal space 220, and the side surfaces of each upper mold support portion 215 do not contact the wall portion 201a. Furthermore, when the second magnetic member 40 constituting the stator body 10 is positioned in the internal space 220 and the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 contacts the surface of the second magnetic member 40 facing the upper mold 202, thereby supporting the second magnetic member 40. This allows the first magnetic member 30 to be supported by the lower mold support portion 210 while the second magnetic member 40 is supported by the upper mold support portion 215 in a more suitable position. Therefore, plastic deformation of the first magnetic member 30 and the second magnetic member 40 can be effectively prevented. Therefore, a stator structure 1 can be obtained that can better prevent a decrease in the detection accuracy of the detection device.

[0233] In the resin mold 200 according to Modification 1 of Embodiment 3, one or more upper mold support portions 215 are further provided on the upper mold 202. When the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 extends from the upper mold 202 toward the teeth space 222, and the side surface of each upper mold support portion 215 does not contact the corresponding wall portion 201a. Furthermore, when the second magnetic member 40 constituting the stator body 10 is positioned in the internal space 220 and the upper mold 202 is positioned relative to the lower mold 201, each upper mold support portion 215 contacts the surface of the second magnetic member 40 facing the upper mold 202 and supports the second magnetic member 40. This makes it possible to support the first teeth portion 32 of the first magnetic member 30 with the lower mold support portion 210 while supporting the second teeth portion 42 of the second magnetic member 40 with the upper mold support portion 215. Therefore, plastic deformation between the first magnetic member 30 and the second magnetic member 40 can be prevented more effectively. Thus, a stator structure 1 can be obtained that can better prevent a decrease in the detection accuracy of the detection equipment.

[0234] In the manufacturing method of the stator structure 1 according to the modified example 1 of Embodiment 3, the resin mold 200 prepared in the preparation step S01 is positioned on the upper mold 202 and further includes one or more upper mold support portions 215 extending from the upper mold 202 toward the bottom portion 201b when the upper mold 202 is positioned relative to the lower mold 201. Furthermore, when the upper mold 202 is positioned relative to the lower mold 201 in the positioning step S02, each upper mold support portion 215 is positioned so as to extend from the upper mold 202 toward the internal space 220 without contacting the wall portion 201a, and the surface of the second magnetic member 40 facing the upper mold 202 contacts each upper mold support portion 215, thereby supporting the second magnetic member 40. As a result, the first magnetic member 30 can be supported by the lower mold support portion 210 while the second magnetic member 40 is supported by the upper mold support portion 215. Therefore, plastic deformation of the first magnetic member 30 and the second magnetic member 40 can be effectively prevented. Therefore, it is possible to manufacture a stator structure 1 that can better prevent a decrease in the detection accuracy of the detection equipment.

[0235] Embodiment 4. The stator structure 1 in Embodiment 4 differs from the stator structure 1 in Embodiment 1 in that each first space 80 is formed only in the non-magnetic member 50. Figure 25 is a schematic diagram showing the teeth portion 12 according to Embodiment 4. Figure 25 shows a perspective view of one teeth portion 12 as seen from the second magnetic member 40 side.

[0236] A first space 80 is formed on the tip side of the tip portion 14 of each tooth portion 12. Each first space 80 is defined by a part of the first opposing surface 30a of the first magnetic member 30 and a non-magnetic side surface 50s which is a part of the side surface of the non-magnetic member 50. That is, each first space 80 is in contact with the corresponding portion of the first opposing surface 30a.

[0237] When viewed along the central axis L, a recessed non-magnetic retractable portion 50c is formed on the side surface of the non-magnetic tip portion 54 facing the central axis L. The non-magnetic side surface 50s is the surface of the non-magnetic retractable portion 50c. Note that the non-magnetic side surface 50s does not have to be a surface that aligns with the central axis L.

[0238] In other words, the non-magnetic retractable portion 50c is formed only on the side surface of the tip portion of the non-magnetic tip portion 54 facing the central axis L. Therefore, each first space 80 is formed only on the side surface of the non-magnetic member 50 without extending beyond the second magnetic member 40 from the corresponding first opposing surface 30a.

[0239] The non-magnetic side surface 50s surrounds at least a portion of the corresponding first space 80; that is, the non-magnetic side surface 50s defines at least a portion of the corresponding first space 80. The other configurations of the stator structure 1 according to Embodiment 4 are the same as the other configurations of the stator structure 1 according to Embodiment 1, and therefore will not be described.

[0240] Next, the method for manufacturing the stator structure 1 in Embodiment 4 will be described. The method for manufacturing the stator structure 1 in Embodiment 4 will also be described based on Figure 6, which is a flowchart showing the method for manufacturing the stator structure 1 in Embodiment 1.

[0241] <Preparation process> In preparation step S01, a second magnetic member 40 without a second retractable portion 40c is prepared. In preparation step S01, a resin molding die 200 is prepared, which includes a lower mold 201 having one or more lower mold support portions 210 that can move back and forth within the internal space 220. Figure 26 is a schematic diagram showing the lower mold 201 according to Embodiment 4. Figure 26 shows a cross-sectional view along a line toward the central axis L.

[0242] In Embodiment 4, each lower mold support portion 210 in the resin mold 200 is separate from the lower mold 201 and is positioned on the lower mold 201 so as to be movable relative to the lower mold 201. Each lower mold support portion 210 is a rod-shaped member.

[0243] Each lower mold support portion 210 is supported by the lower mold 201 such that its longitudinal direction is aligned with the horizontal direction. The upper portion of each lower mold support portion 210 has a lower mold support end portion 210a which contacts the first opposing surface 30a when the first magnetic member 30 is placed inside the lower mold 201.

[0244] Each lower support portion 210 is positioned at a location corresponding to the side of the tip of each tip portion 14 of the stator body 10 in the direction toward the central axis L, that is, at the tip in the direction toward the annular center of the corresponding tip space 224.

[0245] Side wall holes 201c are formed in the tip-side wall portion 201a of the corresponding tip space 224 in the direction toward the annular center, into which each lower mold support portion 210 can be inserted. Each lower mold support portion 210 is inserted into the corresponding side wall hole 201c and is supported by the lower mold 201 so as to be able to move back and forth along the side wall hole 201c toward the tip space 224 of the corresponding internal space 220.

[0246] As each lower mold support 210 advances toward the tip space 224 of the internal space 220, the tip of the lower mold support 210 protrudes into the tip space 224 of the internal space 220, as shown in the right diagram of Figure 26. As the lower mold support 210 retracts toward the outside from the internal space 220, the tip of the lower mold support 210 retracts from the internal space 220, as shown in the left diagram of Figure 26.

[0247] That is, when each lower mold support portion 210 is advanced relative to the tip space 224 of the internal space 220, the tip of the corresponding lower mold support portion 210 protrudes into the tip space 224 of the internal space 220, such that each lower mold support portion end 210a is perpendicularly upward relative to the bottom portion 201b. In other words, each lower mold support portion end 210a faces the upper mold 202 when the upper mold 202 is positioned relative to the lower mold 201.

[0248] The resin mold 200 further includes a holding mechanism (not shown) for maintaining the state in which each lower mold support portion 210 is advanced into the internal space 220 and the state in which it is retracted from the internal space 220. A well-known configuration can be used for this holding mechanism. The other configurations of the resin mold 200 of Embodiment 4 are the same as the other configurations of the resin mold 200 of Embodiment 1, so their description is omitted. Returning to Figure 6, the explanation continues.

[0249] <Placement process> In the placement process S02, the second magnetic member 40 is placed with each lower mold support 210 retracted, and then the first magnetic member 30 is placed with each lower mold support 210 advanced. Figure 27 is a schematic diagram showing the state of the lower mold 201 in Figure 26 during the placement process S02.

[0250] The left diagram of Figure 27 shows the state in which the second magnetic member 40 is positioned on the lower mold 201. At this time, each lower mold support portion 210 maintains a retracted state from the internal space 220.

[0251] Next, the worker advances each lower mold support 210 toward the tip space 224 of the internal space 220. With each lower mold support 210 advanced toward the tip space 224 of the internal space 220, the worker places the first magnetic member 30 on the lower mold 201.

[0252] The right-hand diagram of Figure 27 shows the state in which the first magnetic member 30 is positioned on the lower mold 201. The tip of each lower mold support portion 210 and a part of the end portion 210a of the lower mold support portion protrude into the tip space 224 of the internal space 220, and the first opposing surface 30a of the first magnetic member 30 is positioned to contact the corresponding end portion 210a of the lower mold support portion.

[0253] In this state, the upper mold 202 is positioned relative to the lower mold 201, and the non-magnetic material is poured into and filled into the internal space 220. Return to Figure 6 and continue the explanation.

[0254] <Curing process> In the curing process S03, the state in which each lower mold support part 210 is advanced relative to the internal space 220 is maintained, and the non-magnetic material is cured.

[0255] <Removal process> In the removal process S04, first each lower mold support 210 is retracted from the internal space 220. As a result, the tip of each lower mold support 210 no longer protrudes into the internal space 220, but is retracted into the wall portion 201a. Next, the upper mold 202 is removed from the lower mold 201.

[0256] With the tips of each lower mold support portion 210 not protruding into the internal space 220, the completed stator body 10 is removed from the lower mold 201. The stator body 10 is moved along the direction in which the wall portion 201a of the lower mold 201 extends and is removed from the lower mold 201.

[0257] Since each lower support section 210 is retracted, the stator body 10 and each lower support section 210 do not interfere with each other when the stator body 10 is removed.

[0258] The order in which the upper mold 202 is removed from the lower mold 201 does not matter; it can be at any stage as long as the stator body 10 is removed from the lower mold 201. The upper mold 202 may be removed from the lower mold 201 before each lower mold support part 210 is retracted from the internal space 220.

[0259] The completed stator body 10 has first spaces 80 corresponding to each lower mold support portion 210 formed on the side surface of the tip portion 14. At this time, the first spaces 80 are formed only in the non-magnetic member 50. The first opposing surface 30a of the first magnetic member 30 is exposed in each first space 80. The other configurations of the manufacturing method of the stator structure 1 according to Embodiment 4 are the same as the other configurations of the manufacturing method of the stator structure 1 according to Embodiment 1, so their description is omitted.

[0260] In the stator structure 1 according to Embodiment 4, each first space 80 is formed only on the side surface of the non-magnetic member 50, without extending beyond the second magnetic member 40 from the corresponding first opposing surface 30a. As a result, the first space 80 in the stator body 10 is formed as a very small space. Therefore, the reduction in the mechanical strength of the stator body 10 due to the formation of the first space 80 can be reduced. Thus, a stator structure 1 with less reduction in mechanical strength can be obtained.

[0261] In the resin mold 200 according to Embodiment 4, each lower mold support portion 210 is supported by the lower mold 201 so as to be able to move back and forth within the internal space 220. Furthermore, when each lower mold support portion 210 is in a state where it protrudes from the internal space 220 and the first magnetic member 30 is positioned in the internal space 220, each lower mold support portion 210 contacts the surface of the first magnetic member 30 facing the bottom portion 201b, thereby supporting the first magnetic member 30. This allows the lower mold support portion 210 to be positioned in a very small area of ​​the internal space 220. Consequently, the first space 80 corresponding to the lower mold support portion 210 can also be formed as a very small space. Therefore, even with the configuration in which the first magnetic member 30 is supported by the lower mold support portion 210, the reduction in the mechanical strength of the stator body 10 can be reduced. Thus, a stator structure 1 with less reduction in mechanical strength can be obtained. In addition, by retracting each lower mold support portion 210, the stator body 10, in a state where the non-magnetic material has hardened, can be removed from the lower mold 201 without interference. Therefore, the stator body 10 can be easily removed, and a stator body 10 with reduced manufacturing costs can be obtained.

[0262] In the manufacturing method of the stator structure 1 according to Embodiment 4, each lower mold support portion 210 is supported on the lower mold 201 so as to be able to move back and forth within the internal space 220. In the arrangement step S02, after each lower mold support portion 210 is retracted relative to the internal space 220, the second magnetic member 40 is arranged. Next, after each lower mold support portion 210 is extended relative to the internal space 220, the first magnetic member 30 is arranged. In the removal step S04, after each lower mold support portion 210 is retracted from the internal space 220, the stator body 10 is moved along the wall portion 201a and the stator body 10 is removed from the lower mold 201. This allows the lower mold support portions 210 to be placed in a very small area of ​​the internal space 220. Therefore, the first space 80 corresponding to the lower mold support portion 210 can also be formed as a very small space. Therefore, even with a configuration in which the first magnetic member 30 is supported by the lower mold support portion 210, it is possible to manufacture a stator body 10 that reduces the decrease in mechanical strength, and to manufacture a stator structure 1 with less reduction in mechanical strength.

[0263] Modification Example 1 of Embodiment 4 The stator structure 1 in Modification Example 1 of Embodiment 4 is different from the stator structure 1 in Embodiment 4 in that, in addition to the first space 80 that contacts the first opposing surface 30a, it has a second space 85 that contacts the second opposing surface 40a.

[0264] FIG. 28 is a schematic view showing the tooth portion 12 according to Modification Example 1 of Embodiment 4. In FIG. 28, a perspective view of one tooth portion 12 as seen from the side of the first magnetic member 30 is shown.

[0265] On the side surface on the tip side of each tip portion 14 of the stator body 10, a first space 80 or a second space 85 is formed. Each second space 85 is defined in part by a part of the second opposing surface 40a of the second magnetic member 40 and a non-magnetic side surface 50s that is a part of the side surface of the non-magnetic member 50. That is, each second space 85 contacts the corresponding portion of the second opposing surface 40a.

[0266] When viewed along the central axis L, a non-magnetic retreat portion 50c, which is a recess, is formed on the side surface on the tip side of the non-magnetic tip portion 54 that faces the central axis L. The non-magnetic side surface 50s is the surface of the non-magnetic retreat portion 50c. Note that the non-magnetic side surface 50s does not have to be a surface along the central axis L.

[0267] That is, the non-magnetic retreat portion 50c is formed only on the side surface of the tip portion of the non-magnetic tip portion 54 that faces the central axis L. Therefore, each second space 85 is formed only on the side surface of the non-magnetic member 50 without exceeding the first magnetic member 30 from the corresponding second opposing surface 40a.

[0268] That is, at least a part of each second space 85 is surrounded by the non-magnetic side surface 50s. That is, the non-magnetic side surface 50s defines at least a part of each second space 85.

[0269] Each first space 80 and each second space 85 are alternately arranged in each tooth section 12. That is, of the 14 tooth sections 12, the first space 80 is arranged in 7 of the tooth sections 12, and the second space 85 is arranged in the other 7 tooth sections 12.

[0270] The other components of the stator structure 1 according to the modification 1 of Embodiment 4 are the same as the other components of the stator structure 1 according to Embodiment 4, so their description is omitted.

[0271] Next, the method for manufacturing the stator structure 1 in modified example 1 of Embodiment 4 will be described. The method for manufacturing the stator structure 1 according to modified example 1 of Embodiment 4 will also be described based on Figure 6, a flowchart showing the method for manufacturing the stator structure 1 according to Embodiment 1.

[0272] <Preparation process> In preparation step S01, the first magnetic member 30 and the second magnetic member 40, which do not have retractable portions formed, are prepared. At the same time, the resin mold 200 is prepared. The resin mold 200 will be described later.

[0273] <Placement process> Figure 29 is a schematic diagram showing the state of the lower mold 201 during the placement process S02 in Modification 1 of Embodiment 4.

[0274] The resin mold 200 in the modified example 1 of Embodiment 4 further comprises one or more lower mold support parts 210 and one or more upper mold support parts 215. Each lower mold support part 210 and each upper mold support part 215 is supported by the lower mold 201.

[0275] Each upper mold support 215 is supported by the lower mold 201 so as to be able to move back and forth within the internal space 220. Each upper mold support 215 is separate from the lower mold 201 and is positioned on the lower mold 201 so as to be movable relative to the lower mold 201. Each upper mold support 215 is a rod-shaped member.

[0276] Each upper mold support portion 215 is supported by the lower mold 201 such that its longitudinal direction is aligned with the horizontal direction. The lower portion of each upper mold support portion 215 has an upper mold support end portion 215a which contacts the second opposing surface 40a when the second magnetic member 40 is placed inside the lower mold 201.

[0277] Each upper support portion 215 is positioned at a location corresponding to the side of the tip of each tip portion 14 of the stator body 10 in the direction toward the central axis L, that is, at the tip in the direction toward the annular center of the corresponding tip space 224.

[0278] Side wall holes 201c are formed in the tip-side wall portion 201a of the corresponding tip space 224 in the direction toward the annular center, into which each upper mold support portion 215 can be inserted. Each upper mold support portion 215 is inserted into the corresponding side wall hole 201c and is supported by the lower mold 201 so as to be able to move back and forth along the side wall hole 201c toward the tip space 224 of the corresponding internal space 220.

[0279] As each upper mold support portion 215 advances toward the tip space 224 of the internal space 220, the tip of the upper mold support portion 215 protrudes into the tip space 224 of the internal space 220, as shown in the right diagram of Figure 29. As the upper mold support portion 215 retracts toward the outside from the internal space 220, the tip of the upper mold support portion 215 retracts from the internal space 220, as shown in the left diagram of Figure 29.

[0280] That is, when each upper mold support portion 215 is advanced relative to the tip space 224 of the internal space 220, the tip of the corresponding upper mold support portion 215 protrudes into the tip space 224 of the internal space 220 such that each upper mold support portion end 215a is perpendicularly downward relative to the bottom portion 201b. In other words, each upper mold support portion end 215a faces the bottom portion 201b.

[0281] As a result, when each upper mold support portion 215 is in a forward position toward the internal space 220, each upper mold support portion end 215a contacts the second opposing surface 40a on the tip side in the direction toward the central axis L of the corresponding second tip portion 44.

[0282] Note that the resin mold 200 further includes a holding mechanism (not shown) for maintaining the state in which each upper mold support portion 215 has advanced into the internal space 220 and the state in which it has retreated from the internal space 220. A well-known configuration can be adopted for the holding mechanism.

[0283] Note that the resin mold 200 further includes a holding mechanism (not shown) for maintaining the state in which each lower mold support portion 210 has advanced into the internal space 220 and the state in which it has retreated from the internal space 220. A well-known configuration can be adopted for the holding mechanism.

[0284] Since the other configurations of the upper mold 202 in Modified Example 1 of Embodiment 4 are the same as those of the upper mold 202 in Modified Example 1 of Embodiment 1, the description thereof is omitted. Since the other configurations of the lower mold 201 in Modified Example 1 of Embodiment 4 are the same as those of the lower mold 201 in Embodiment 4, the description thereof is omitted.

[0285] Based on FIGS. 29 and 6, the description of the placement step S02 will be continued. In the placement step S02, first, as shown in the left diagram of FIG. 29, the operator retracts each lower mold support portion 210 and each upper mold support portion 215 from the internal space 220. Next, the operator places the second magnetic member 40 on the lower mold 201. Next, as shown in the right diagram of FIG. 29, the operator advances each lower mold support portion 210 and each upper mold support portion 215 with respect to the internal space 220. Next, the operator places the first magnetic member 30 on the lower mold 201.

[0286] As a result, the second facing surface 40a and each upper mold support portion end 215a come into contact with each other, and the first facing surface 30a and each lower mold support portion end 210a come into contact with each other, and the first magnetic member 30 and the second magnetic member 40 are arranged on the lower mold 201.

[0287] In this state, the upper mold 202 is arranged with respect to the lower mold 201, and the non-magnetic material is poured into and filled in the internal space 220.

[0288] <Curing step> In the curing process S03, the lower mold support parts 210 and upper mold support parts 215 are kept in an advanced position relative to the internal space 220, and the non-magnetic material is cured.

[0289] <Removal process> In the removal process S04, first, the worker retracts each lower mold support 210 and each upper mold support 215 from the internal space 220. As a result, the tips of each lower mold support 210 and each upper mold support 215 no longer protrude into the internal space 220, but are retracted into the wall portion 201a. Next, the upper mold 202 is removed from the lower mold 201.

[0290] With the tips of each lower mold support 210 and each upper mold support 215 not protruding into the internal space 220, the completed stator body 10 is removed from the lower mold 201. The stator body 10 is moved along the direction in which the wall portion 201a of the lower mold 201 extends and is removed from the lower mold 201.

[0291] Since each lower support section 210 is retracted, the stator body 10, each lower support section 210, and each upper support section 215 do not interfere with each other when the stator body 10 is removed.

[0292] The order in which the upper mold 202 is removed from the lower mold 201 does not matter; it can be at any stage before the stator body 10 is removed from the lower mold 201. The upper mold 202 may be removed from the lower mold 201 before each lower mold support 210 and each upper mold support 215 are retracted from the internal space 220.

[0293] The completed stator body 10 has second spaces 85 formed on the side surfaces of the tip portions 14, corresponding to each upper mold support portion 215. At this time, the second spaces 85 are formed only in the non-magnetic members 50. The second opposing surface 40a of the second magnetic member 40 is exposed in each second space 85. The other configurations of the method for manufacturing the stator structure 1 according to the modification 1 of Embodiment 4 are the same as the other configurations of the method for manufacturing the stator structure 1 according to Embodiment 4, so their description is omitted.

[0294] In the manufacturing method of the stator structure 1 according to the modified example 1 of Embodiment 4, the first magnetic member 30 and the second magnetic member 40 are supported by each of the lower mold support parts 210 and each of the upper mold support parts 215, respectively. However, this is not the only way. For example, a third support part that combines the functions of the lower mold support part 210 and the upper mold support part 215 may protrude into the internal space 220 to support the first magnetic member 30 and the second magnetic member 40. That is, each of the ends of the third support part perpendicular to the bottom part 201b may support the first magnetic member 30 and the second magnetic member 40. In this case, a single third space corresponding to both the first space 80 and the second space 85 is formed at the corresponding position on the stator body 10. That is, each third space is defined by the first opposing surface 30a, the second opposing surface 40a, and the non-magnetic side surface 50s.

[0295] In the stator structure 1 according to the modified example 1 of Embodiment 4, the second magnetic member 40 has a second opposing surface 40a which is the surface facing the first magnetic member 30, and the non-magnetic member 50 has one or more second spaces 85 that are in contact with a part of the second opposing surface 40a. Furthermore, each second space 85 is formed only on the side surface of the non-magnetic member 50 without extending beyond the first magnetic member 30 from the corresponding second opposing surface 40a. As a result, the second spaces 85 are formed as very small spaces in the stator body 10. Therefore, the reduction in the mechanical strength of the stator body 10 due to the formation of the first space 80 and the second spaces 85 can be reduced. Thus, a stator structure 1 with less reduction in mechanical strength can be obtained.

[0296] In the resin mold 200 according to Modification 1 of Embodiment 4, one or more upper mold support parts 215 are further provided on the lower mold 201. Each upper mold support part 215 is supported on the lower mold 201 so as to be able to move back and forth within the internal space 220. When each upper mold support part 215 is protruding from the internal space 220 and the second magnetic member 40 constituting the stator body 10 is positioned in the internal space 220, each upper mold support part 215 contacts the surface of the second magnetic member 40 facing the upper mold 202 and supports the second magnetic member 40. As a result, the upper mold support parts 215 can also be positioned in a very small area of ​​the internal space 220. Therefore, the first space 80 corresponding to the lower mold support part 210 and the second space 85 corresponding to the upper mold support part 215 can be formed in very small spaces. Therefore, even if the lower mold support portion 210 supports the first magnetic member 30 and the upper mold support portion 215 supports the second magnetic member 40, the reduction in the mechanical strength of the stator body 10 can be reduced. Thus, a stator structure 1 with less reduction in mechanical strength can be obtained. Furthermore, by retracting each of the lower mold support portions 210 and each of the upper mold support portions 215, the stator body 10, in a hardened state of non-magnetic material, can be removed from the lower mold 201 without interference. Thus, removal of the stator body 10 becomes easier, and a stator body 10 with reduced manufacturing costs can be obtained.

[0297] In the manufacturing method of the stator structure 1 according to the modification 1 of Embodiment 4, the resin mold 200 prepared in the preparation step S01 further comprises one or more upper mold support parts 215 arranged on the lower mold 201. Each upper mold support part 215 is supported on the lower mold 201 so as to be able to move back and forth in relation to the internal space 220. In the arrangement step S02, after each lower mold support part 210 and each upper mold support part 215 is set to a state where they are retracted from the internal space 220, the second magnetic member 40 is arranged. Then, after each lower mold support part 210 and each upper mold support part 215 is set to a state where they are protruding into the internal space 220, the first magnetic member 30 is arranged. In the removal step S04, after each lower mold support part 210 and each upper mold support part 215 is set to a state where they are retracted from the internal space 220, the stator body 10 is moved along the wall part 201a and the stator body 10 is removed from the lower mold 201. Furthermore, in the placement process S02, the surface of the second magnetic member 40 facing the upper mold 202 contacts each upper mold support portion 215, thereby supporting the second magnetic member 40. This allows the first opposing surface 30a of the first magnetic member 30 and the second opposing surface 40a of the second magnetic member 40 to be supported when the non-magnetic material is filled and cured. Consequently, plastic deformation of the first magnetic member 30 and the second magnetic member 40 due to the filling of the non-magnetic material under molding pressure P can be prevented. Thus, a stator structure 1 that can prevent a decrease in the detection accuracy of the detection equipment can be manufactured. Furthermore, plastic deformation of the first magnetic member 30 and the second magnetic member 40 can be prevented without selecting a highly fluid non-magnetic material. Therefore, the selection of non-magnetic materials is not limited, and the stator structure 1 can be manufactured at a reduced cost. In addition, this allows the thickness of the first magnetic member 30 and the second magnetic member 40 to be made thinner. Consequently, the amount of magnetic material used can be reduced, and the stator structure 1 can be manufactured at a reduced cost. Furthermore, this allows the stator body 10, in its hardened state due to the non-magnetic material, to be removed from the lower mold 201 without interference. Consequently, the removal of the stator body 10 becomes easier, and the stator body 10 can be manufactured at a reduced cost.

[0298] In addition, each tooth portion 12 described in Embodiments 1 to 4, including modified examples, is provided with either a first space 80 or a second space 85. However, this is not limited to this. Each first space 80 and each second space 85 do not need to be formed in all tooth portions 12. The lower mold support portion 210 and the upper mold support portion 215 can be appropriately installed considering the proper support of the first magnetic member 30 and the second magnetic member 40 during manufacturing. For example, either the first space 80 or the second space 85 may be formed in only at least one tooth portion 12. Both the first space 80 and each second space 85 may be formed in a single tooth portion 12.

[0299] Furthermore, the first spaces 80 and second spaces 85 described in Embodiments 1 to 4, including modified examples, are formed in the teeth portion 12. However, this is not limited to this. The lower mold support portion 210 and the upper mold support portion 215 can be appropriately installed in suitable positions, taking into consideration the proper support of the first magnetic member 30 and the second magnetic member 40 during manufacturing. For example, they may be formed in the yoke portion 11, or they may be formed in both the teeth portion 12 and the yoke portion 11.

[0300] Furthermore, in embodiments 1 to 4, including modified examples, the lower die 201 is positioned with its bottom portion 201b aligned horizontally with respect to the paper plane, as shown in Figure 7, for example. However, it is not limited to this. The lower die 201 may be positioned in any way. For example, the lower die 201 may be positioned with its bottom portion 201b aligned vertically with respect to the paper plane. Even in this case, the stator body 10 can be removed from the lower die 201 by moving it along the direction in which each lower die support portion 210 or wall portion 201a extends, i.e., horizontally along the paper plane.

[0301] Furthermore, in embodiments 1 to 4, including modified examples, the first magnetic member 30, the second magnetic member 40, the non-magnetic member 50, and the stator body 10 are annular. However, this is not limited to this. For example, a part of the annular shape may be cut off. That is, the first magnetic member 30, the second magnetic member 40, the non-magnetic member 50, and the stator body 10 may be part of an annular shape. In this case, the first yoke portion 31, the second yoke portion 41, the non-magnetic yoke portion 51, and the yoke portion 11 are also part of an annular shape. Moreover, the internal space 220 and the yoke space 221 of the lower mold 201 may also be part of an annular shape.

[0302] Furthermore, each of the configurations described in Embodiments 1 to 4, including the modified versions, can be adapted together with the configurations described in the other embodiments to a single stator structure 1, a resin mold 200, and a method for manufacturing the stator structure 1. [Explanation of Symbols]

[0303] 1 Stator structure, 10 Stator body, 11 Yoke section, 12 Teeth section, 13 Body section, 14 Tip section, 15 Coil, 30 First magnetic member, 30a First opposing surface, 30c First retraction section, 30s First side surface, 31 First yoke section, 32 First teeth section, 33 First body section, 34 First tip section, 40 Second magnetic member, 40a Second opposing surface, 40c Second retraction section, 40s Second side surface, 41 Second yoke section, 42 Second teeth section, 43 Second body section, 44 Second tip section, 50 Non-magnetic member, 50c Non-magnetic retraction section, 50s Non-magnetic side surface, 51 Non-magnetic yoke section, 52 Non-magnetic teeth section, 53 Non-magnetic body section, 54 Non-magnetic tip section, 80 First space, 85 Second space, 90 Rotating body, 200 Resin molding die, 201 lower die, 201a wall section, 201b bottom section, 201c side wall hole, 202 upper die, 210 lower die support section, 210a end of lower die support section, 215 upper die support section, 215a end of upper die support section, 220 internal space, 221 yoke space, 222 teeth space, 223 body space, 224 tip space, L central axis, P molding pressure.

Claims

1. It comprises a first magnetic member (30) that is annular or part of an annular shape, a second magnetic member (40) that is annular or part of an annular shape, and a non-magnetic member (50) that is annular or part of an annular shape. The first magnetic member (30) and the second magnetic member (40) are positioned opposite each other and on a central axis (L) where the center of the ring of the first magnetic member (30) and the center of the ring of the second magnetic member (40) are in a straight line. The non-magnetic member (50) is positioned between the first magnetic member (30) and the second magnetic member (40). The first magnetic member (30) has a first opposing surface (30a) which is a surface facing the second magnetic member (40), The non-magnetic member (50) has one or more first spaces (80) that are in contact with a part of the first opposing surface (30a), The non-magnetic member (50) is formed by hardening a non-magnetic material. Stator structure (1).

2. Each of the first spaces (80) extends from the first opposing surface (30a) across the non-magnetic member (50) and the second magnetic member (40) and beyond the second magnetic member (40). The stator structure (1) according to claim 1.

3. Each of the first spaces (80) is composed of a space surrounded by a non-magnetic retraction portion (50c), which is a corresponding recess formed on the side surface of the non-magnetic member (50), and a space surrounded by a second retraction portion (40c), which is a corresponding recess formed on the side surface of the second magnetic member (40). The stator structure (1) according to claim 2.

4. The second magnetic member (40) has a second yoke portion (41) that is annular or part of an annular shape, and a plurality of second teeth portions (42) that extend from the second yoke portion (41) toward the central axis (L). The nonmagnetic member (50) has a nonmagnetic yoke portion (51) that is an annular or part of an annular shape, and a plurality of nonmagnetic teeth portions (52) that extend from the nonmagnetic yoke portion (51) toward the central axis (L). Each of the second retractable portions (40c) is formed on the side surface of the corresponding second tooth portion (42) in the direction toward the central axis (L), Each of the non-magnetic retractable portions (50c) is formed on the side surface of the corresponding non-magnetic tooth portion (52) in the direction toward the central axis (L), The stator structure (1) according to claim 3.

5. The second magnetic member (40) has a second yoke portion (41) that is annular or part of an annular shape, and a plurality of second teeth portions (42) that extend from the second yoke portion (41) toward the central axis (L). The nonmagnetic member (50) has a nonmagnetic yoke portion (51) that is an annular or part of an annular shape, and a plurality of nonmagnetic teeth portions (52) that extend from the nonmagnetic yoke portion (51) toward the central axis (L). Each of the second teeth portions (42) has a pair of sides facing each of the adjacent second teeth portions (42), Each of the non-magnetic teeth (52) has a pair of sides facing each of the non-magnetic teeth (52) located on either side, Each of the second retractable portions (40c) is formed on at least one of a pair of sides of the corresponding second teeth portion (42), Each of the non-magnetic retractable portions (50c) is formed on at least one of a pair of sides of the corresponding non-magnetic teeth portion (52). The stator structure (1) according to claim 3.

6. Each of the first spaces (80) is composed of a space surrounded by a non-magnetic retraction portion (50c), which is a corresponding hole formed in the non-magnetic member (50), and a space surrounded by a second retraction portion (40c), which is a corresponding hole formed in the second magnetic member (40). The stator structure (1) according to claim 2.

7. The second magnetic member (40) has a second yoke portion (41) that is annular or part of an annular shape, and a plurality of second teeth portions (42) that extend from the second yoke portion (41) toward the central axis (L). The nonmagnetic member (50) has a nonmagnetic yoke portion (51) that is an annular or part of an annular shape, and a plurality of nonmagnetic teeth portions (52) that extend from the nonmagnetic yoke portion (51) toward the central axis (L). Each of the second retractable portions (40c) is formed in the corresponding second tooth portion (42), Each of the non-magnetic retractable portions (50c) is formed on the corresponding non-magnetic teeth portion (52). The stator structure (1) according to claim 6.

8. The second magnetic member (40) has a second opposing surface (40a) which is a surface facing the first magnetic member (30), The non-magnetic member (50) further has one or more second spaces (85) that are in contact with a part of the second opposing surface (40a), Each of the second spaces (85) extends from the second opposing surface (40a) across the non-magnetic member (50) and the first magnetic member (30) and beyond the first magnetic member (30), Each of the second spaces (85) is composed of a space surrounded by the corresponding non-magnetic retraction portion (50c), which is a corresponding recess, and a space surrounded by the first retraction portion (30c), which is a corresponding recess formed on the side surface of the first magnetic member (30). The stator structure (1) according to claim 3.

9. The second magnetic member (40) has a second opposing surface (40a) which is a surface facing the first magnetic member (30), The non-magnetic member (50) further has one or more second spaces (85) that are in contact with a part of the second opposing surface (40a), Each of the second spaces (85) extends from the second opposing surface (40a) across the non-magnetic member (50) and the first magnetic member (30) and beyond the first magnetic member (30), Each of the second spaces (85) is composed of a space surrounded by the corresponding non-magnetic retraction portion (50c), which is a corresponding recess, and a space surrounded by the first retraction portion (30c), which is a corresponding recess formed on the side surface of the first magnetic member (30). The first magnetic member (30) has a first yoke portion (31) that is annular or part of an annular shape, and a plurality of first teeth portions (32) that extend from the first yoke portion (31) toward the central axis (L). Each of the first retractable portions (30c) is formed on the side surface of the corresponding first tooth portion (32) in the direction toward the central axis (L), Each of the non-magnetic retractable portions (50c) is formed on the side surface of the corresponding non-magnetic tooth portion (52) in the direction toward the central axis (L), The stator structure (1) according to claim 4.

10. The second magnetic member (40) has a second opposing surface (40a) which is a surface facing the first magnetic member (30), The non-magnetic member (50) further has one or more second spaces (85) that are in contact with a part of the second opposing surface (40a), Each of the second spaces (85) extends from the second opposing surface (40a) across the non-magnetic member (50) and the first magnetic member (30) and beyond the first magnetic member (30), Each of the second spaces (85) is composed of a space surrounded by the corresponding non-magnetic retraction portion (50c), which is a corresponding recess, and a space surrounded by the first retraction portion (30c), which is a corresponding recess formed on the side surface of the first magnetic member (30). The first magnetic member (30) has a first yoke portion (31) that is annular or part of an annular shape, and a plurality of first teeth portions (32) that extend from the first yoke portion (31) toward the central axis (L). Each of the first teeth (32) has a pair of sides facing each of the adjacent first teeth (32), Each of the first retractable portions (30c) is formed on at least one of a pair of sides of the corresponding first teeth portion (32), Each of the non-magnetic retractable portions (50c) is formed on at least one of a pair of sides of the corresponding non-magnetic teeth portion (52). The stator structure (1) according to claim 5.

11. The second magnetic member (40) has a second opposing surface (40a) which is a surface facing the first magnetic member (30), The non-magnetic member (50) further has one or more second spaces (85) that are in contact with a part of the second opposing surface (40a), Each of the second spaces (85) extends from the second opposing surface (40a) across the non-magnetic member (50) and the first magnetic member (30) and beyond the first magnetic member (30), Each of the second spaces (85) is composed of a space surrounded by a non-magnetic retraction portion (50c), which is a corresponding hole formed in the non-magnetic member (50), and a space surrounded by a first retraction portion (30c), which is a corresponding hole formed in the first magnetic member (30). The stator structure (1) according to claim 6.

12. The second magnetic member (40) has a second opposing surface (40a) which is a surface facing the first magnetic member (30), The non-magnetic member (50) further has one or more second spaces (85) that are in contact with a part of the second opposing surface (40a), Each of the second spaces (85) extends from the second opposing surface (40a) across the non-magnetic member (50) and the first magnetic member (30) and beyond the first magnetic member (30), Each of the second spaces (85) is composed of a space surrounded by the non-magnetic retraction portion (50c), which is a corresponding hole formed in the non-magnetic member (50), and a space surrounded by the first retraction portion (30c), which is a corresponding hole formed in the first magnetic member (30). The first magnetic member (30) has a first yoke portion (31) that is annular or part of an annular shape, and a plurality of first teeth portions (32) that extend from the first yoke portion (31) toward the central axis (L). Each of the first retractable portions (30c) is formed in the corresponding first tooth portion (32), Each of the non-magnetic retractable portions (50c) is formed on the corresponding non-magnetic teeth portion (52). The stator structure (1) according to claim 7.

13. The second side surface (40s), which is the side surface of each of the second retracted portions (40c), is exposed to the corresponding first space (80). A stator structure (1) according to any one of claims 3 to 12.

14. The second side surface (40s) of each of the second retracted portions (40c) is covered with the non-magnetic member (50). A stator structure (1) according to any one of claims 3 to 12.

15. The first side surface (30s) of each of the first retracted portions (30c) is exposed to the corresponding second space (85). A stator structure (1) according to any one of claims 8 to 12.

16. Each of the first retractable portions (30c) has a corresponding first side surface (30s) which is covered with the non-magnetic member (50). A stator structure (1) according to any one of claims 8 to 12.

17. Each of the first spaces (80) is formed only on the side surface of the non-magnetic member (50) without extending beyond the second magnetic member (40) from the corresponding first opposing surface (30a). The stator structure (1) according to claim 1.

18. The second magnetic member (40) has a second opposing surface (40a) which is a surface facing the first magnetic member (30), The non-magnetic member (50) further has one or more second spaces (85) that are in contact with a part of the second opposing surface (40a), Each of the second spaces (85) is formed only on the side surface of the non-magnetic member (50) without extending beyond the first magnetic member (30) from the corresponding second opposing surface (40a). The stator structure (1) according to claim 17.

19. The apparatus comprises a lower mold (201) which is box-shaped with a bottom and defines an internal space (220), an upper mold (202) which can be positioned relative to the lower mold (201) to close the internal space (220), and one or more lower mold support parts (210) positioned on the lower mold (201), The lower mold (201) has a bottom portion (201b) which is the bottom part of a box-shaped bottom, and a wall portion (201a) which is the wall part of a box-shaped bottom and extends from the bottom portion (201b), The internal space (220) is defined by the wall portion (201a) and the bottom portion (201b). When the first magnetic member (30) constituting the stator body (10) is positioned in the internal space (220), each of the lower mold support parts (210) contacts the surface of the first magnetic member (30) facing the bottom portion (201b) and supports the first magnetic member (30). Resin mold (200).

20. Each of the lower mold support portions (210) is a protrusion extending from the wall portion (201a), When the upper mold (202) is positioned relative to the lower mold (201), each lower mold support portion (210) extends from the bottom portion (201b) toward the upper mold (202). The resin mold (200) according to claim 19.

21. The upper mold (202) further comprises one or more upper mold support parts (215) arranged thereon. When the upper mold (202) is positioned relative to the lower mold (201), each upper mold support (215) extends from the upper mold (202) toward the bottom (201b), and the side surface of each upper mold support (215) is in contact with the corresponding wall (201a). When the second magnetic member (40) constituting the stator body (10) is positioned in the internal space (220) and the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) contacts the surface of the second magnetic member (40) facing the upper mold (202) and supports the second magnetic member (40). The resin mold (200) according to claim 20.

22. The internal space (220) is composed of a yoke space (221) which is an annular space, and one or more teeth spaces (222) which are spaces extending from the yoke space (221) toward the center of the annulus. Each of the lower mold support portions (210) is a wall portion (201a) that defines the tip portion of the corresponding tooth space (222) in the direction toward the center of the annule. The resin mold (200) according to claim 20.

23. The upper mold (202) further comprises one or more upper mold support parts (215) arranged thereon. In the state in which the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) extends from the upper mold (202) toward the bottom portion (201b) and into the space of the tip portion in the direction toward the annular center of the corresponding teeth space (222), and the side surface of each upper mold support portion (215) is in contact with the wall portion (201a) that defines the tip portion in the direction toward the annular center of the corresponding teeth space (222). When the second magnetic member (40) constituting the stator body (10) is positioned in the internal space (220) and the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) contacts the surface of the second magnetic member (40) facing the upper mold (202) and supports the second magnetic member (40). The resin mold (200) according to claim 22.

24. The internal space (220) is composed of a yoke space (221) which is an annular space, and one or more teeth spaces (222) which are spaces extending from the yoke space (221) toward the center of the annulus. Each of the lower mold support portions (210) is a wall portion (201a) from which the wall portion (201a) protrudes, and is at least one of a pair of opposing wall portions (201a) that define the corresponding tooth space (222). The resin mold (200) according to claim 20.

25. The upper mold (202) further comprises one or more upper mold support parts (215) arranged thereon. In the state in which the upper mold (202) is positioned relative to the lower mold (201), each upper mold support (215) extends from the upper mold (202) toward the bottom (201b) and toward the corresponding tooth space (222), and the side surface of each upper mold support (215) is in contact with at least one of the opposing pair of wall portions (201a) that define the corresponding tooth space (222). When the second magnetic member (40) constituting the stator body (10) is positioned in the internal space (220) and the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) contacts the surface of the second magnetic member (40) facing the upper mold (202) and supports the second magnetic member (40). The resin mold (200) according to claim 24.

26. With the upper mold (202) positioned relative to the lower mold (201), each lower mold support portion (210) extends from the bottom portion (201b) toward the upper mold (202) without contacting the wall portion (201a). The resin mold (200) according to claim 19.

27. The upper mold (202) further comprises one or more upper mold support parts (215) arranged thereon. When the upper mold (202) is positioned relative to the lower mold (201), each upper mold support (215) extends toward the internal space (220), and the side surface of each upper mold support (215) is not in contact with the wall (201a). When the second magnetic member (40) constituting the stator body (10) is positioned in the internal space (220) and the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) contacts the surface of the second magnetic member (40) facing the upper mold (202) and supports the second magnetic member (40). The resin mold (200) according to claim 26.

28. The internal space (220) is composed of a yoke space (221) which is an annular space, and one or more teeth spaces (222) which are spaces extending from the yoke space (221) toward the center of the annulus. Each of the lower mold support parts (210) is positioned in the corresponding tooth space (222). The resin mold (200) according to claim 26.

29. The upper mold (202) further comprises one or more upper mold support parts (215) arranged thereon. In the state in which the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) extends from the upper mold (202) toward the teeth space (222), and the side surface of each upper mold support portion (215) is not in contact with the corresponding wall portion (201a). When the second magnetic member (40) constituting the stator body (10) is positioned in the internal space (220) and the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) contacts the surface of the second magnetic member (40) facing the upper mold (202) and supports the second magnetic member (40). The resin mold (200) according to claim 28.

30. Each of the lower mold support parts (210) is supported by the lower mold (201) so as to be able to move back and forth within the internal space (220). When each of the lower mold support portions (210) protrudes from the internal space (220) and the first magnetic member (30) is positioned in the internal space (220), each of the lower mold support portions (210) contacts the surface of the first magnetic member (30) facing the bottom portion (201b) and supports the first magnetic member (30). The resin mold (200) according to claim 19.

31. The lower mold (201) further comprises one or more upper mold support parts (215) arranged thereon. Each of the upper mold support parts (215) is supported by the lower mold (201) so as to be able to move back and forth within the internal space (220), When each of the upper mold support portions (215) protrudes from the internal space (220) and the second magnetic member (40) constituting the stator body (10) is positioned in the internal space (220), each of the upper mold support portions (215) contacts the surface of the second magnetic member (40) facing the upper mold (202) and supports the second magnetic member (40). The resin mold (200) according to claim 30.

32. A preparation step (S01) for preparing a resin mold (200) for manufacturing the stator body (10), a first magnetic member (30), a second magnetic member (40), and a non-magnetic material, Following the preparation step (S01), the arrangement step (S02) is performed in which the first magnetic member (30), the second magnetic member (40), and the non-magnetic material are placed inside the resin mold (200). Following the arrangement step (S02), a curing step (S03) is performed to cure the non-magnetic material, Following the curing step (S03), a removal step (S04) is performed to remove the stator body (10), which is composed of the cured non-magnetic member (50), the first magnetic member (30), and the second magnetic member (40), from the resin mold (200). Equipped with, The resin mold (200) prepared in the preparation step (S01) comprises a lower mold (201) which is box-shaped with a bottom and defines an internal space (220), an upper mold (202) which can close the internal space (220) when placed relative to the lower mold (201), and one or more lower mold support parts (210) placed on the lower mold (201). The lower mold (201) has a bottom portion (201b) which is the bottom part of a box-shaped bottom, and a wall portion (201a) which is the wall part of a box-shaped bottom and extends from the bottom portion (201b), The internal space (220) is defined by the wall portion (201a) and the bottom portion (201b). In the arrangement step (S02), the second magnetic member (40) and the first magnetic member (30) are arranged in order in the internal space (220), then the upper mold (202) is placed relative to the lower mold (201), and then the non-magnetic material is filled into the internal space (220). In the arrangement step (S02), the first magnetic member (30) is positioned on the lower mold (201) such that the surface of the first magnetic member (30) facing the bottom portion (201b) of the first magnetic member (30) is in contact with each of the lower mold support portions (210), thereby supporting the first magnetic member (30). A method for manufacturing a stator structure (1).

33. Each of the lower mold support portions (210) is a protrusion extending from the wall portion (201a), With the upper mold (202) positioned relative to the lower mold (201), each lower mold support portion (210) extends from the bottom portion (201b) toward the upper mold (202). In the removal step (S04), the stator body (10) is moved along the direction in which each of the lower mold support parts (210) extends, and the stator body (10) is removed from the lower mold (201). A method for manufacturing the stator structure (1) according to claim 32.

34. The resin mold (200) prepared in the preparation step (S01) is positioned on the upper mold (202), and further comprises one or more upper mold support parts (215) extending from the upper mold (202) toward the bottom part (201b) when the upper mold (202) is positioned relative to the lower mold (201). In the arrangement step (S02), when the upper mold (202) is positioned relative to the lower mold (201), the side surface of each upper mold support (215) contacts the corresponding wall (201a), so that each upper mold support (215) extends from the upper mold (202) into the internal space (220), and the surface of the second magnetic member (40) facing the upper mold (202) contacts each upper mold support (215), thereby supporting the second magnetic member (40). A method for manufacturing the stator structure (1) according to claim 33.

35. Each of the lower mold support parts (210) is not in contact with the wall part (201a), With the upper mold (202) positioned relative to the lower mold (201), each lower mold support portion (210) extends from the bottom portion (201b) toward the upper mold (202). In the removal step (S04), the stator body (10) is moved along the direction in which each of the lower mold support parts (210) extends, and the stator body (10) is removed from the lower mold (201). A method for manufacturing the stator structure (1) according to claim 32.

36. The resin mold (200) prepared in the preparation step (S01) is positioned on the upper mold (202), and further comprises one or more upper mold support parts (215) extending from the upper mold (202) toward the bottom part (201b) when the upper mold (202) is positioned relative to the lower mold (201). In the arrangement step (S02), when the upper mold (202) is positioned relative to the lower mold (201), each upper mold support portion (215) is positioned so as to extend from the upper mold (202) into the internal space (220) without contacting the wall portion (201a), and the surface of the second magnetic member (40) facing the upper mold (202) contacts each upper mold support portion (215), thereby supporting the second magnetic member (40). A method for manufacturing the stator structure (1) according to claim 35.

37. Each of the lower mold support parts (210) is supported by the lower mold (201) so as to be able to move back and forth within the internal space (220), In the arrangement step (S02), after each of the lower mold support parts (210) is retracted relative to the internal space (220), the second magnetic member (40) is arranged, and then after each of the lower mold support parts (210) is retracted relative to the internal space (220), the first magnetic member (30) is arranged. In the removal step (S04), after each of the lower mold support parts (210) is retracted from the internal space (220), the stator body (10) is moved along the wall part (201a) and the stator body (10) is removed from the lower mold (201). A method for manufacturing the stator structure (1) according to claim 32.

38. The resin mold (200) prepared in the preparation step (S01) further comprises one or more upper mold support parts (215) arranged on the lower mold (201), Each of the upper mold support parts (215) is supported by the lower mold (201) so as to be able to move back and forth within the internal space (220), In the arrangement step (S02), after each of the lower mold support parts (210) and each of the upper mold support parts (215) is retracted from the internal space (220), the second magnetic member (40) is arranged, and then after each of the lower mold support parts (210) and each of the upper mold support parts (215) is extended into the internal space (220), the first magnetic member (30) is arranged. In the removal process (S04), after each of the lower mold support parts (210) and each of the upper mold support parts (215) are retracted from the internal space (220), the stator body (10) is moved along the wall part (201a) and the stator body (10) is removed from the lower mold (201). In the arrangement step (S02), the surface of the second magnetic member (40) facing the upper mold (202) comes into contact with each of the upper mold support parts (215) so that the second magnetic member (40) is supported. A method for manufacturing the stator structure (1) according to claim 37.

Images