stator

Abstract

The present disclosure aims to provide a stator (1) capable of improving detection accuracy. The stator (1) of the present disclosure includes a stator body (10) having a yoke portion (11) and a plurality of tooth portions (12), the yoke portion (11) being a circular ring or a circular arc that is a part of the circular ring, and the plurality of tooth portions (12) extending from the yoke portion (11) to the radial inner side of the circular ring; and a plurality of coils (15) wound around each tooth portion (12). The stator body (10) has one or more magnetic stator members (20) and one or more non-magnetic stator members (30), the magnetic stator members (20) being composed of a magnetic material, the non-magnetic stator members (30) being composed of a non-magnetic material, and the stator body (10) being composed of the magnetic stator members (20) and the non-magnetic stator members (30) stacked along the central axis direction of the circular ring.

Description

Technical Field

[0001] This disclosure relates to the stator. Background Technology

[0002] Previously, a rotary transformer stator was known to be constructed from a single metal plate in order to reduce manufacturing costs. In this rotary transformer stator, a portion of the metal plate was bent and stacked in the axial direction to create large-volume teeth (see, for example, Patent Document 1).

[0003] (Existing technical documents)

[0004] (Patent Documents)

[0005] Patent Document 1: Japanese Patent Application Publication No. 2011-239531 Summary of the Invention

[0006] (The technical problem that the invention aims to solve)

[0007] In the past, rotary transformer stators used a structure in which the teeth extended axially. Therefore, when the coil was wound on the teeth, the air gap between the teeth and the rotor increased, which led to a decrease in detection accuracy.

[0008] In order to solve the above problems, the present disclosure aims to provide a stator that can improve detection accuracy.

[0009] (Technical solutions used to solve the problem)

[0010] The stator disclosed herein comprises: a stator body having a yoke and a plurality of teeth, the yoke being a ring or an arc forming part of a ring, the plurality of teeth extending radially inward from the yoke toward the ring; and a plurality of coils wound around each tooth, the stator body having one or more magnetic stator components and one or more non-magnetic stator components, the magnetic stator components being made of magnetic material, the non-magnetic stator components being made of non-magnetic material, and the stator body being constructed by stacking the magnetic stator components and the non-magnetic stator components along the central axis of the ring.

[0011] (Invention effect)

[0012] The stator disclosed herein can improve detection accuracy. Attached Figure Description

[0013] Figure 1 This is a schematic diagram showing the stator involved in Embodiment 1.

[0014] Figure 2 It means Figure 1 A schematic diagram showing the detailed structure of the stator.

[0015] Figure 3 It means Figure 1 A sectional view of the section at line III-III.

[0016] Figure 4 This is a cross-sectional view showing the stator body in a variation of Embodiment 1.

[0017] Figure 5 This is a cross-sectional view showing the stator body in Embodiment 2.

[0018] Figure 6 This is a cross-sectional view showing the stator body in Modified Example 1 of Embodiment 2.

[0019] Figure 7 This is a cross-sectional view showing the stator body in embodiment 3.

[0020] Figure 8 This is a cross-sectional view showing the stator body in Modified Example 1 of Embodiment 3.

[0021] Figure 9 This is a schematic diagram showing the non-magnetic stator component in Embodiment 4.

[0022] Figure 10 This is a schematic diagram showing a portion of the magnetic stator component in Embodiment 5.

[0023] Figure 11 This is a schematic diagram showing a portion of the non-magnetic stator component in Embodiment 6. Detailed Implementation

[0024] Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings.

[0025] (Implementation Method 1)

[0026] Figure 1 This is a schematic diagram showing the stator 1 according to Embodiment 1. Figure 2 It means Figure 1 A schematic diagram of the detailed structure of stator 1. Figure 3 It means Figure 1 A cross-sectional view of the section at line III-III. Stator 1 can be used as the stator of a rotary transformer or a torque sensor.

[0027] The stator 1 is roughly annular in shape. The axis of the center of the annulus of the stator 1 is taken as the central axis L. That is, the central axis L is the axis passing through the center of the stator 1. A rotating body 50, such as a rotor, is disposed in a hole that opens in the center of the annulus of the stator 1. The central axis L is aligned with the rotation axis of the rotating body 50.

[0028] The stator 1 and the rotating body 50 are configured in a non-contact manner. A rotary transformer or torque sensor can use the stator 1 to detect physical quantities such as the rotation angle, rotation speed, or rotation torque of the rotating body 50.

[0029] The stator 1 includes a stator body 10 and 14 coils 15. The stator body 10 has a yoke 11 that is a ring and 14 teeth 12 extending radially inward from the yoke 11 toward the ring. Each coil 15 is disposed in each tooth 12.

[0030] The axis passing through the center of the ring serving as the yoke 11 is the same as the central axis L. Furthermore, the number of teeth 12 and coils 15 is not limited to 14; any number is acceptable.

[0031] In the toothed portion 12, a coil setting portion 12a is formed on the portion continuous from the yoke portion 11, and a tooth front end portion 12b is formed on the front end portion of the toothed portion 12 that is continuous from the coil setting portion 12a. The width of the tooth front end portion 12b is wider than the width of the coil setting portion 12a.

[0032] The innermost end of the tooth portion 12 in the radial direction is formed into an arc shape when viewed along the central axis L. When viewed by connecting the innermost ends of the front ends 12b of the tooth, the innermost ends of the front ends 12b of the tooth are each formed along the same circumference.

[0033] With the stator 1 equipped with the rotating body 50, an air gap is formed between the front end 12b of each tooth and the rotating body 50. The front end 12b of each tooth and the rotating body 50 do not contact each other.

[0034] A coil 15 is wound around the coil setting portion 12a of each tooth portion 12. The coil 15 is formed by winding the wire multiple times. Alternatively, the coil 15 may not necessarily be formed by winding the wire multiple times. For example, a coil 15 may be composed of a pair of coil components formed in a C-shape. Alternatively, a pair of opposing coil components may be connected by clamping the coil setting portion 12a with a pair of coil components formed in a C-shape, thereby forming a single coil 15.

[0035] The stator body 10 has a magnetic stator component 20 and a non-magnetic stator component 30. The stator body 10 is formed by stacking the magnetic stator component 20 and the non-magnetic stator component 30 along the central axis L.

[0036] The stator body 10 is formed by stacking magnetic stator components 20 and non-magnetic stator components 30, which are roughly the same in shape, in the direction along the central axis L. The magnetic stator components 20 and non-magnetic stator components 30 are stacked using conventionally known processing methods such as riveting and bonding.

[0037] The magnetic stator component 20 is made of a magnetic material. This magnetic material can be an electromagnet, permalloy, ferrite, nanocrystalline soft magnetic alloy, or amorphous alloy.

[0038] The non-magnetic stator component 30 is made of a non-magnetic material. This non-magnetic material can be non-magnetic stainless steel or resin. Furthermore, the non-magnetic stator component 30 does not include an adhesive layer for bonding the magnetic stator components 20 together.

[0039] A through hole 30a is formed in the non-magnetic stator component 30, extending along the central axis L. Multiple through holes 30a are formed in the non-magnetic stator component 30 at the location corresponding to the yoke 11.

[0040] When the magnetic stator component 20 and the non-magnetic stator component 30 are considered to have their respective thickness directions along the central axis L, the thickness of the magnetic stator component 20 is thinner than the thickness of the non-magnetic stator component 30. The thicknesses of the magnetic stator component 20 and the non-magnetic stator component 30 can be determined based on the required detection accuracy of the rotary transformer.

[0041] The rotary transformer is capable of measuring the rotation angle of the rotating body 50. The operating principle of the rotary transformer using the stator 1 of this disclosure is well known, therefore its description is omitted.

[0042] like Figure 1 As shown, a rotating body 50 with a circular cross-section is inserted into a hole with an opening in the center of the annulus of the stator 1. In this state, when each coil 15 is energized, the coil 15 is excited to generate a magnetic field. The magnetic flux Φ of the magnetic field generated by the coil 15 flows in the magnetic circuit formed by the stator 1.

[0043] A magnetic path formed by the stator 1 extends from any tooth 12 through the yoke 11 to the tooth 12 adjacent to that tooth 12 in the circumferential direction. Furthermore, a path is obtained to return to the arbitrary tooth 12 through the space that is a hole opening in the center of the annulus of the stator 1.

[0044] A rotating body 50 is disposed in a hole with an opening at the center of the annulus of the stator 1. The magnetic flux Φ flowing in the magnetic circuit is affected by the change in the posture of the rotating body 50. The change in the posture of the rotating body 50 can be detected based on the change in the magnetic flux Φ.

[0045] The rotating body 50 may also be fitted with a structure that makes it easy to verify the change in magnetic flux Φ caused by the change in the orientation of the rotating body 50, i.e., the rotation of the rotating body 50. For example, multiple regions with different magnetic permeability may be formed on the outer peripheral surface facing each tooth tip 12b of the rotating body 50. Alternatively, the cross-section of the rotating body 50 may be non-circular, so that the air gap distance is different.

[0046] Generally, the magnetic circuit formed in the stator is formed in the magnetic components. When this magnetic circuit is regarded as a magnetic loop formed in the stator, the magnetic reluctance Rm of the magnetic loop is determined by the length l of the magnetic circuit, the cross-sectional area S of the magnetic circuit, and the permeability μ of the component forming the magnetic circuit as follows.

[0047] Rm=l / μS

[0048] As shown in the formula above, the thickness of the magnetic component forming the magnetic circuit affects the magnetic reluctance Rm. That is, as the thickness of the magnetic component forming the magnetic circuit increases, the cross-sectional area S of the magnetic circuit increases, and the magnetic reluctance Rm decreases. If the magnetic reluctance Rm of the magnetic circuit decreases, then a rotary transformer using this stator can also detect minute changes in magnetic flux caused by minute rotation of the rotating body, thus improving the detection accuracy of the rotary transformer.

[0049] Even among the materials used in the stator as a whole, the material cost of magnetic components is relatively high. Therefore, by reducing the amount of magnetic components used, such as by thinning the stator according to the detection accuracy of the rotary transformer, the manufacturing cost of the stator can be reduced.

[0050] On the other hand, at each coil wound around the teeth, the thinner the teeth, the shorter the coil winding length and the lower the input impedance. Therefore, the magnetic field strength generated by each coil weakens. Consequently, the magnetic flux Φ decreases, and the change in magnetic flux Φ caused by the change in the orientation of the rotating body also decreases, reducing the detection accuracy of the rotary transformer.

[0051] Thus, if the amount of magnetic components used is reduced and the thickness of the stator is thinned in order to suppress manufacturing costs, the input impedance of the coils will decrease, and the detection accuracy of the stator will decrease. However, in this embodiment 1, even if the thickness of the magnetic stator component 20 is thinned in order to reduce the amount of magnetic components used, since the non-magnetic stator component 30 is stacked on the magnetic stator component 20, the input impedance of each coil 15 will not decrease, and the detection accuracy of the rotary transformer using the stator 1 will not decrease.

[0052] Furthermore, in the stator 1 of Embodiment 1, a yoke 11 is provided as a ring. However, it is not limited to this. The yoke 11 may also be an arc as part of the ring. For example, a 1 / 4 arc, that is, an arc-shaped yoke 11 with a central angle of 90 degrees, may also be provided. By arranging the stator 1 with an arc-shaped yoke 11 along the outer periphery of the rotating body 50, the stator 1 provided with the arc-shaped yoke 1 can be used as the stator 1 of a rotary transformer for detecting the rotation angle of the rotating body 50. As a result, the manufacturing cost of the stator 1 can be further reduced. In addition, when detecting the rotation angle of an existing rotating shaft, it is easier to provide an arc-shaped stator 1 on an existing shaft.

[0053] The stator 1 in Embodiment 1 includes: a yoke 11, which is a ring or an arc as part of a ring; a stator body 10 having a plurality of teeth 12 extending radially inward from the yoke 11 toward the ring; and a plurality of coils 15 wound around each tooth 12. Furthermore, the stator body 10 has one or more magnetic stator components 20 and one or more non-magnetic stator components 30. The magnetic stator components 20 are made of magnetic material, and the non-magnetic stator components 30 are made of non-magnetic material. The stator body 10 is constructed by stacking the magnetic stator components 20 and the non-magnetic stator components 30 along the central axis of the ring. Thus, in the stator body 10 with the stacked magnetic stator components 20 and non-magnetic stator components 30, each coil 15 can be arranged in each tooth 12 extending radially inward from the yoke 11, and the outermost radially inward end of each tooth 12 can be positioned opposite the rotating body 50. Therefore, the air gap between the rotating body 50 and the teeth 12 can be reduced. This improves the detection accuracy of sensors such as rotary transformers using the stator 1. Furthermore, the distance between the teeth 12 and the yoke 11 can be kept constant. This makes it difficult for leakage flux to increase, further improving detection accuracy. Additionally, since the teeth 12 where each coil 15 is located are constructed by stacking magnetic stator components 20 and non-magnetic stator components 30, the input impedance of the coils 15 can be reduced. Therefore, the amount of magnetic components used in the magnetic stator component 20 can be appropriately matched to the detection accuracy, and the input impedance of the coils 15 can be set to an appropriate value. This improves the detection accuracy of sensors using the stator 1 while maintaining an appropriate amount of magnetic components. Furthermore, a magnetic stator component 20 with the required volume can be prepared according to the required detection accuracy. Therefore, the amount of magnetic components used can be optimally set, reducing manufacturing costs. Furthermore, even if the thickness of the magnetic stator component 20 is reduced, the mechanical strength of the magnetic stator component 20 can still be guaranteed because the magnetic stator component 20 and the non-magnetic stator component 30 are stacked together.

[0054] In the stator 1 of Embodiment 1, the thicknesses of the magnetic stator component 20 and the non-magnetic stator component 30 are different in the direction in which they are stacked. Therefore, the thickness of the magnetic stator component 20 can be designed taking into account the magnetic reluctance of the magnetic circuit formed in the stator 1. On the other hand, the thickness of the non-magnetic stator component 30 can be designed taking into account the input impedance of the coil 15 and the mechanical strength of the stator 1. Therefore, the amount of magnetic material used in the stator 1 can be reduced, and the detection accuracy of the sensor using the stator 1 can be maintained. Furthermore, the required mechanical strength can be maintained in the stator 1 regardless of the amount of magnetic material used.

[0055] In the stator 1 of Embodiment 1, the thickness of the magnetic stator component 20 is thinner than that of the non-magnetic stator component 30 in the direction in which the magnetic stator component 20 and the non-magnetic stator component 30 are stacked. Therefore, in the magnetic stator component 20, which is composed of a minimum amount of magnetic components, the stator 1 can also have the required mechanical strength by increasing the thickness of the non-magnetic stator component 30.

[0056] In the stator 1 of Embodiment 1, a plurality of through holes 30a are formed in the non-magnetic stator component 30, extending through the magnetic stator component 20 and the non-magnetic stator component 30 in the direction in which they are stacked. This allows for a reduction in the weight of the stator 1. Furthermore, this reduces the amount of non-magnetic material used in the non-magnetic stator component 30, thereby reducing manufacturing costs.

[0057] In the stator 1 of Embodiment 1, each through hole 30a is formed at a position on the non-magnetic stator component 30 corresponding to the yoke 11. As a result, the non-magnetic stator component 30 can be made lighter and its material reduced without significantly reducing the mechanical strength of the non-magnetic stator component 30.

[0058] (Modification 1 of Implementation Method 1)

[0059] The stator body 10 of the stator 1 in Variation 1 of Embodiment 1 differs from the stator 1 of Embodiment 1 in that it has two magnetic stator components 20 and two non-magnetic stator components 30.

[0060] Figure 4 This is a cross-sectional view showing the stator body 10 of a modified example 1 of embodiment 1. Figure 4 The image shows the stator body 10 in a variation 1 of embodiment 1. Figure 1 A cross-sectional view at the same line as line III-III.

[0061] The stator body 10 has two magnetic stator components 20 and two non-magnetic stator components 30. The stator body 10 is constructed by alternating overlapping of the magnetic stator components 20 and the non-magnetic stator components 30.

[0062] In other words, in the stacking direction, a non-magnetic stator component 30 is stacked below the magnetic stator component 20. When considered as a single block, two of these blocks are stacked to form the stator body 10. The other structures of the stator 1 in Variation 1 of Embodiment 1 are the same as those of the stator 1 in Embodiment 1, and therefore, descriptions are omitted.

[0063] Furthermore, in Variation 1 of Embodiment 1, the stator 1 has two magnetic stator components 20 and two non-magnetic stator components 30. However, it is not limited to this. The stator 1 may also have more than two magnetic stator components 20 and more than two non-magnetic stator components 30. Furthermore, a magnetic stator component 20 and a non-magnetic stator component 30 may be alternately stacked.

[0064] In a variation of Embodiment 1, the stator 1 is constructed by alternating layers of magnetic stator components 20 and non-magnetic stator components 30. This allows for the formation of a uniform magnetic field over a long length along the stacking direction while minimizing the amount of magnetic material used. Consequently, it is possible to detect physical quantities such as the rotation angle at any position along the length of the rotating body 50 while minimizing the amount of magnetic material used. Furthermore, it is possible to observe the rotating body 50 along its length while suppressing any increase in the amount of magnetic components used.

[0065] (Implementation Method 2)

[0066] Figure 5 This is a cross-sectional view showing the stator body 10 of Embodiment 2. Figure 5 The image shows the stator body 10 in embodiment 2 and its relationship with... Figure 1 A cross-sectional view at the same line as line III-III.

[0067] The stator body 10 of stator 1 in embodiment 2 differs from stator 1 in embodiment 1 in that it has two magnetic stator components 20 and one non-magnetic stator component 30.

[0068] The stator body 10 has a laminate 40, which is formed by stacking two magnetic stator components 20 with a non-magnetic stator component 30. In Embodiment 2, the stator body 10 is constituted by a single laminate 40. The other structures of the stator 1 in Embodiment 2 are the same as those of the stator 1 in Embodiment 1, and therefore are omitted from the description.

[0069] In the stator 1 of Embodiment 2, when the magnetic stator component 20 is designated as the first component and the non-magnetic stator component 30 is designated as the second component, the stator body 10 has a laminate 40 in which at least two first components are stacked, sandwiching at least one second component. That is, the magnetic stator component 20 is stacked while sandwiching the non-magnetic stator component 30. As a result, a pair of magnetic stator components 20 can be arranged with appropriate spacing. Therefore, it is possible to detect the physical quantity of the corresponding part of the rotating body 50 along the stacking direction while suppressing the increase in the amount of magnetic material used.

[0070] Furthermore, the stator body 10 in Embodiment 2 has a laminate 40 consisting of two magnetic stator components 20 and one non-magnetic stator component 30. However, it is not limited to this. The stator body 10 may have two or more magnetic stator components 20 and two or more non-magnetic stator components 30. For example, the stator body 10 may also have a laminate 40 obtained by arranging two non-magnetic stator components 30 sandwiched between a pair of magnetic stator components 20. Thus, by changing the number of non-magnetic stator components 30, the spacing between a pair of magnetic stator components 20 can be changed, and a stator 1 corresponding to the detection portion of the rotating body 50 can be easily manufactured. In addition, for example, the stator body 10 may also have a laminate 40 obtained by arranging two magnetic stator components 20 sandwiched between a non-magnetic stator component 30. That is, the laminate 40 can also be stacked in the order of two magnetic stator components 20, one non-magnetic stator component 30, and two magnetic stator components 20. Thus, by changing the number of magnetic stator components 20, the intensity of the magnetic flux can be changed, and the stator 1 can be easily adjusted according to the required detection accuracy.

[0071] (Modification 1 of Implementation Method 2)

[0072] The stator body 10 of the stator 1 in Variation 1 of Embodiment 2 differs from the stator 1 of Embodiment 2 in that it has four magnetic stator components 20 and two non-magnetic stator components 30.

[0073] Figure 6 This is a cross-sectional view of the stator body 10, a variation of Embodiment 2, Example 1. Figure 6 The image shows the stator body 10 in Modification 1 of Embodiment 2 and... Figure 1 A cross-sectional view at the same line as line III-III.

[0074] The stator body 10 has four magnetic stator components 20 and two non-magnetic stator components 30. When the structure obtained by stacking two magnetic stator components 20 sandwiching one non-magnetic stator component 30 is considered as a laminate 40, the stator body 10 of this embodiment is constructed by continuously stacking two laminates 40. The other structures of the stator 1 in Variation 1 of Embodiment 2 are the same as those of the stator 1 in Embodiment 2, and therefore, descriptions are omitted.

[0075] Furthermore, in the modified example 1 of embodiment 2, the stator 1 is constructed by continuously stacking two laminated bodies 40. However, it is not limited to this. For example, the stator body 10 may be constructed by continuously stacking three or more laminated bodies 40.

[0076] In the stator 1 of the modified example 1 of embodiment 2, the stator body 10 is constructed by continuously stacking two or more laminated bodies 40. Therefore, the characteristics of the stator 1 having a stator body 10 obtained by continuously stacking one laminated body 40 can be easily predicted. That is, the characteristics of the stator body 10 having multiple laminated bodies 40 can be predicted based on the characteristics of a non-magnetic stator component 30 and a laminated body 40 containing two magnetic stator components 20. This allows for a reduction in the design cost and a shortening of the design period for the stator 1. Furthermore, this allows for the manufacture of the stator body 10 by pre-manufacturing multiple laminated bodies 40 and continuously stacking the required number of laminated bodies 40 as needed. This also allows for a reduction in the manufacturing cost and a shortening of the manufacturing period for the stator body 10.

[0077] (Implementation Method 3)

[0078] Figure 7 This is a cross-sectional view showing the stator body 10 of Embodiment 3. Figure 7 The image shows the stator body 10 in embodiment 3 and its relationship with... Figure 1 A cross-sectional view at the same line as line III-III.

[0079] The stator body 10 of stator 1 in embodiment 3 differs from stator 1 in embodiment 1 in that it has two non-magnetic stator components 30 and one magnetic stator component 20.

[0080] The stator body 10 has a laminate 40, which is formed by stacking two non-magnetic stator components 30 with a magnetic stator component 20 between them. In Embodiment 3, the stator body 10 is constituted by a single laminate 40. The other structures of the stator 1 in Embodiment 3 are the same as those of the stator 1 in Embodiment 1, and therefore are omitted from the description.

[0081] In the stator 1 of Embodiment 3, when the non-magnetic stator component 30 is used as the first component and the magnetic stator component 20 is used as the second component, the stator body 10 has a laminate 40 in which at least two first components sandwich at least one second component. That is, the laminate 40 is formed by the non-magnetic stator component 30 sandwiching the magnetic stator component 20. As a result, the magnetic stator component 20 is protected by being sandwiched by the non-magnetic stator component 30, and there is no need to worry about bending or other damage even if it interferes with other components. Therefore, the magnetic stator component 20 can be thinned as needed, and furthermore, even when the magnetic stator component 20 is thinned, the possibility of damage to the magnetic stator component 20 can be reduced.

[0082] Furthermore, the stator body 10 in Embodiment 3 has a laminate 40, which is obtained by stacking two non-magnetic stator components 30 sandwiching one magnetic stator component 20. However, it is not limited to this. The stator body 10 may also have a laminate 40 with two or more magnetic stator components 20 and two or more non-magnetic stator components 30. For example, a laminate 40 may be formed by stacking two non-magnetic stator components 30 sandwiching two stacked magnetic stator components 20. Thus, by adjusting and changing the number of magnetic stator components 20, the intensity of the magnetic flux can be changed, and the design and manufacture of the stator 1 can be handled more simply according to the required detection accuracy. In addition, for example, a laminate 40 may be formed by stacking two non-magnetic stator components 30 sandwiching one magnetic stator component 20. That is, a laminate 40 may be formed by stacking two non-magnetic stator components 30, one magnetic stator component 20, and two non-magnetic stator components 30 in that order. This prevents the input impedance of each coil 15 from decreasing. Therefore, it is easy to manufacture a stator 1 based on the input impedance of each coil 15.

[0083] (Modification 1 of Implementation Method 3)

[0084] The stator body 10 of the stator 1 in Variation 1 of Embodiment 3 differs from the stator 1 of Embodiment 3 in that it has four non-magnetic stator components 30 and two magnetic stator components 20.

[0085] Figure 8 This is a cross-sectional view of the stator body 10, a variation of Embodiment 3, Example 1. Figure 8 The image shows the stator body 10 in Modification 1 of Embodiment 3 and... Figure 1 A cross-sectional view at the same line as line III-III.

[0086] The stator body 10 has four non-magnetic stator components 30 and two magnetic stator components 20. When a magnetic stator component 20 is sandwiched between two non-magnetic stator components 30 and stacked as a laminate 40, the stator body 10 is constructed by continuously stacking two laminates 40. The other structures of the stator 1 in Variation 1 of Embodiment 3 are the same as those of the stator 1 in Embodiment 3, and therefore descriptions are omitted.

[0087] Furthermore, in the stator body 10 of Variation 1 of Embodiment 3, when a magnetic stator component 20 and two non-magnetic stator components 30 sandwiching the magnetic stator component 20 are considered as a stacked body 40, two stacked bodies 40 are stacked to form the stator body 10. However, it is not limited to this. For example, three or more stacked bodies 40 may be stacked consecutively to form the stator body 10.

[0088] In the stator 1 of Variation 1 of Embodiment 3, the stator body 10 is constructed by continuously stacking two or more laminated bodies 40. Therefore, the characteristics of the stator body 10 obtained by continuously stacking one laminated body 40 can be easily predicted. That is, based on the characteristics of a laminated body 40 consisting of two non-magnetic stator components 30 sandwiching a magnetic stator component 20, the characteristics of a stator body 10 with multiple laminated bodies 40 continuously stacked can be easily predicted. This allows for a reduction in the design cost and a shortening of the design period for the stator 1. Furthermore, this allows for the manufacture of the stator body 10 by pre-manufacturing multiple laminated bodies 40 and continuously stacking the required number of laminated bodies 40 as needed. This also allows for a reduction in the manufacturing cost and a shortening of the manufacturing period for the stator body 10.

[0089] (Implementation Method 4)

[0090] The non-magnetic stator component 30 of stator 1 in embodiment 4 has a different shape than the magnetic stator component 20, which is different from the stator 1 in embodiment 1. Figure 9 This is a schematic diagram showing the non-magnetic stator component 30 in embodiment 4.

[0091] When viewed along the central axis L, the shape of the non-magnetic stator component 30 differs from that of the magnetic stator component 20. Multiple recesses 30b are formed on the outer periphery of the non-magnetic stator component 30.

[0092] The recess 30b is formed on a portion of the stator body 10 corresponding to the outer peripheral edge of the yoke 11. In addition, the recess 30b is formed on the surface of the stator body 10 corresponding to the tooth front end 12b and opposite to the rotating body 50.

[0093] Furthermore, a recess 30b is formed in the stator body 10, corresponding to the outer periphery of the yoke 11, but not covering the entire periphery. The recess 30b is not formed in the portion of the stator body 10 corresponding to the coil mounting portion 12a of the tooth 12.

[0094] The recess 30b is not formed in the portion of the stator body 10 corresponding to the end of the tooth front end 12b of the tooth portion 12. The other structures of the stator 1 in Embodiment 4 are the same as those in Embodiment 1, so the description is omitted.

[0095] In the stator 1 of embodiment 4, when viewed along the central axis L of the stator 1, the magnetic stator component 20 has a different shape than the non-magnetic stator component 30. Therefore, by providing the recess 30b, the non-magnetic stator component 30 can be made lighter, thereby making the stator 1 lighter. Furthermore, the non-magnetic stator component 30 can be manufactured with less material. This reduces the manufacturing cost of the non-magnetic stator component 30.

[0096] Furthermore, in the stator 1 of Embodiment 4, a recess 30b is formed around the entire periphery of the portion of the stator body 10 corresponding to the outer peripheral edge of the yoke 11, not covering the entire periphery. Thus, a magnetic stator component 20 and a non-magnetic stator component 30 are stacked on a portion of the portion of the stator body 10 corresponding to the outer peripheral edge of the yoke 11. Therefore, the magnetic stator component 20 is supported by the non-magnetic stator component 30 at the portion of the stator body 10 corresponding to the outer peripheral edge of the yoke 11, maintaining the required strength. Therefore, the possibility of the magnetic stator component 20 breaking at the portion of the stator body 10 corresponding to the outer peripheral edge of the yoke 11 can be reduced.

[0097] Furthermore, according to the stator 1 in Embodiment 4, the recess 30b is not formed in the portion of the stator body 10 corresponding to the coil mounting portion 12a of the tooth portion 12. Therefore, even when the coil 15 is wound in the coil mounting portion 12a, the magnetic stator component 20 maintains the required strength by being supported by the non-magnetic stator component 30. Thus, the possibility of the magnetic stator component 20 breaking at the portion of the stator body 10 corresponding to the coil mounting portion 12a of the tooth portion 12 can be reduced.

[0098] Furthermore, according to the stator 1 in Embodiment 4, the recess 30b is not formed at the end of the tooth tip 12b of the tooth portion 12 of the stator body 10. Therefore, the magnetic stator component 20 of the stator body 10 corresponding to the end of the tooth tip 12b of the tooth portion 12 is supported by the non-magnetic stator component 30, maintaining the required strength. Thus, the possibility of breakage of the magnetic stator component 20 at the portion of the stator body 10 corresponding to the end of the tooth tip 12b of the tooth portion 12 can be reduced.

[0099] Furthermore, in the shape of the non-magnetic stator component 30 of Embodiment 4, the shape of the portion other than the recess 30b is the same as the shape of the corresponding portion of the magnetic stator component 20. However, this is not a limitation. For example, the shape of the non-magnetic stator component 30 may be larger than that of the magnetic stator component 20. Thus, for example, when the stator 1 interferes with other objects, the larger non-magnetic stator component 30 will interfere with the object first, thereby preventing damage to the magnetic stator component 20. As a result, the possibility of damage to the magnetic stator component 20 can be suppressed to a lower level.

[0100] Furthermore, in Embodiment 4, the non-magnetic stator component 30 does not have a through hole 30a. However, it is not limited to this. The non-magnetic stator component 30 may also have one or more through holes 30a together with multiple recesses 30b. As a result, it is possible to further reduce the weight of the non-magnetic stator component 30 and reduce manufacturing costs.

[0101] (Implementation Method 5)

[0102] The magnetic stator component 20 in Embodiment 5 differs from the stator 1 in Embodiment 1 in that it is constructed by connecting multiple magnetic stator plates 25. Figure 10 This is a schematic diagram showing a portion of the magnetic stator component 20 in embodiment 5.

[0103] The magnetic stator component 20 has a plurality of magnetic stator plates 25. The magnetic stator component 20 is formed by connecting the plurality of magnetic stator plates 25. Each magnetic stator plate 25 has a magnetic tooth 26 corresponding to the tooth 12 of the stator body 10 and a magnetic yoke 27 corresponding to a part of the yoke 11.

[0104] A magnetic protrusion 25a is formed at one end of the arc-shaped magnetic yoke 27 in the circumferential direction of each magnetic stator plate 25. A magnetic recess 25b is formed at the other end of the arc-shaped magnetic yoke 27 in the circumferential direction opposite to one end. When the magnetic stator plates 25 are connected, two magnetic stator plates 25 are connected to each other by connecting the magnetic protrusion 25a of one magnetic stator plate 25 and the magnetic recess 25b of different magnetic stator plates 25.

[0105] The magnetic stator component 20 is formed by connecting multiple magnetic stator plates 25 to form a ring or arc. The other structures of the stator 1 in Embodiment 5 are the same as in Embodiment 1, therefore descriptions are omitted.

[0106] According to the stator 1 in Embodiment 5, each magnetic stator component 20 has a plurality of magnetic stator plates 25. Furthermore, the magnetic stator component 20 is formed by connecting the plurality of magnetic stator plates 25. Additionally, each magnetic stator plate 25 has a magnetic tooth 26 corresponding to the tooth 12 and a magnetic yoke 27 corresponding to a portion of the yoke 11. Therefore, when cutting the magnetic stator plates 25 from the electromagnetic steel sheet, the electromagnetic steel sheet can be used without waste, thus reducing manufacturing costs.

[0107] Furthermore, in Embodiment 5, magnetic protrusions 25a and magnetic recesses 25b are formed on the magnetic stator plates 25 for interconnection. However, this is not a limitation. Well-known structures can be used for the connection mechanism of each magnetic stator plate 25.

[0108] (Implementation Method 6)

[0109] The non-magnetic stator component 30 in Embodiment 6 differs from the stator 1 in Embodiment 1 in that it is constructed by connecting multiple non-magnetic stator plates 35. Figure 11 This is a schematic diagram showing a portion of the non-magnetic stator component 30 in embodiment 6.

[0110] The nonmagnetic stator component 30 has a plurality of nonmagnetic stator laminations 35. The nonmagnetic stator component 30 is formed by connecting the plurality of nonmagnetic stator laminations 35. Each nonmagnetic stator lamination 35 has a nonmagnetic tooth 36 corresponding to the tooth 12 of the stator body 10 and a nonmagnetic yoke 37 corresponding to a part of the yoke 11.

[0111] A non-magnetic protrusion 35a is formed at one end of the arc-shaped non-magnetic yoke 37 of each non-magnetic stator lamination 35 in the circumferential direction. A non-magnetic recess 35b is formed at the other end of the arc-shaped non-magnetic yoke 37 in the circumferential direction, opposite to one end. When the non-magnetic stator laminations 35 are connected, two non-magnetic stator laminations 35 are connected to each other by connecting the non-magnetic protrusion 35a of one non-magnetic stator lamination 35 and the non-magnetic recess 35b of different non-magnetic stator laminations 35.

[0112] Multiple non-magnetic stator plates 35 are connected to form a ring or arc, thus constituting a non-magnetic stator component 30. The other structures of the stator 1 in Embodiment 6 are the same as in Embodiment 1, therefore descriptions are omitted.

[0113] According to the stator 1 in Embodiment 6, each non-magnetic stator component 30 has a plurality of non-magnetic stator plates 35. Furthermore, the non-magnetic stator component 30 is formed by connecting the plurality of non-magnetic stator plates 35. Additionally, each non-magnetic stator plate 35 has a non-magnetic tooth 36 corresponding to the tooth 12 and a non-magnetic yoke 37 corresponding to a portion of the yoke 11. Therefore, compared to manufacturing a larger non-magnetic stator component 30, it is not necessary to increase the size of the molds and resin molding apparatus required for the resin molded article. Thus, the manufacturing cost of the non-magnetic stator component 30 can be reduced. Furthermore, compared to pre-storing a larger non-magnetic stator component 30, the storage space can be reduced, and the storage cost of the component can be reduced.

[0114] Alternatively, the stator 1 can be manufactured using the magnetic stator sheet 25 of Embodiment 5 and the non-magnetic stator sheet 35 of Embodiment 6. In this case, the magnetic stator sheet 25 and the corresponding non-magnetic stator sheet 35 are first stacked. Next, the coil 15 is provided at the position corresponding to the tooth portion 12. Then, the stator 1 can be manufactured by connecting multiple intermediate manufactured products, which are obtained by stacking the magnetic stator sheet 25 and the non-magnetic stator sheet 35 provided with the coil 15. By manufacturing in this way, the arrangement of the coil 15 becomes easier, and the manufacturing cost can be reduced.

[0115] Furthermore, in Embodiment 6, non-magnetic protrusions 35a and non-magnetic recesses 35b are formed on the non-magnetic stator laminations 35 for interconnection. However, this is not a limitation. Well-known structures can be used for the connection mechanism of each non-magnetic stator lamination 35.

[0116] Furthermore, the structures described in Embodiment 1, Embodiment 1 Modification 1, Embodiment 2, Embodiment 2 Modification 1, Embodiment 3, Embodiment 3 Modification 1, Embodiment 4, Embodiment 5, and Embodiment 6 can be applied to other embodiments.

[0117] The technical solutions disclosed herein will be described in conjunction with these notes below.

[0118] (Note 1)

[0119] A stator having:

[0120] A stator body (10) having a yoke (11) and a plurality of teeth (12), the yoke (11) being an annulus or an arc forming part of the annulus, the plurality of teeth (12) extending radially inward from the yoke (11) toward the annulus; and

[0121] Multiple coils (15) are wound around each of the teeth (12).

[0122] The stator body (10) has one or more magnetic stator components (20) and one or more non-magnetic stator components (30).

[0123] The magnetic stator component (20) is made of magnetic material.

[0124] The non-magnetic stator component (30) is made of non-magnetic material.

[0125] The stator body (10) is formed by stacking the magnetic stator component (20) and the non-magnetic stator component (30) along the central axis of the ring.

[0126] (Note 2)

[0127] According to the stator described in Appendix 1, wherein,

[0128] When viewed along the central axis (L) of the stator (1), the shape of the magnetic stator component (20) is different from that of the non-magnetic stator component (30).

[0129] (Note 3)

[0130] According to the stator described in Appendix 1 or Appendix 2, wherein,

[0131] The thicknesses of the magnetic stator component (20) and the non-magnetic stator component (30) in the stacked direction are different.

[0132] (Note 4)

[0133] According to any one of Appendix 1 to Appendix 3, the stator, wherein,

[0134] Regarding the thickness of the magnetic stator component (20) and the non-magnetic stator component (30) in the stacking direction, the thickness of the magnetic stator component (20) is thinner than the thickness of the non-magnetic stator component (30).

[0135] (Note 5)

[0136] According to any one of Appendix 1 to Appendix 4, the stator, wherein,

[0137] The non-magnetic stator component (30) has a plurality of through holes (30a) that extend in the direction in which the magnetic stator component (20) and the non-magnetic stator component (30) are stacked.

[0138] (Note 6)

[0139] According to the stator described in Appendix 5, wherein,

[0140] Each of the through holes (30a) is formed on the non-magnetic stator component (30) at a position corresponding to the yoke (11).

[0141] (Note 7)

[0142] According to any one of Appendix 1 to Appendix 6, the stator, wherein,

[0143] When either the magnetic stator component (20) or the non-magnetic stator component (30) is used as the first component, and the other component, which is different from the first component, is used as the second component,

[0144] The stator body (10) has a stack (40) of at least two first components sandwiching at least one second component.

[0145] (Note 8)

[0146] According to the stator described in Appendix 7, wherein,

[0147] The stator body (10) is composed of two or more stacked bodies (40) stacked continuously.

[0148] (Note 9)

[0149] According to any one of Appendix 1 to Appendix 6, the stator, wherein,

[0150] The magnetic stator component (20) and the non-magnetic stator component (30) are stacked alternately one after another.

[0151] (Postscript 10)

[0152] According to any one of Appendix 1 to Appendix 9, the stator, wherein,

[0153] Each of the magnetic stator components (20) has a plurality of magnetic stator plates (25).

[0154] The magnetic stator component (20) is formed by connecting the plurality of magnetic stator plates (25).

[0155] Each of the magnetic stator plates (25) has a magnetic tooth (26) corresponding to the tooth (12) and a magnetic yoke (27) corresponding to a part of the yoke (11).

[0156] (Postscript 11)

[0157] According to any one of Appendix 1 to Appendix 10, the stator, wherein,

[0158] Each of the aforementioned non-magnetic stator components (30) has a plurality of non-magnetic stator laminations (35).

[0159] The non-magnetic stator component (30) is formed by connecting the plurality of non-magnetic stator laminations (35).

[0160] Each of the non-magnetic stator plates (35) has a non-magnetic tooth (36) corresponding to the tooth (12) and a non-magnetic yoke (37) corresponding to a part of the yoke (11).

[0161] (Explanation of the labels in the attached diagram)

[0162] 1: Stator; 10: Stator body; 11: Yoke; 12: Tooth; 12a: Coil setting part; 12b: Tooth front end; 15: Coil; 20: Magnetic stator component; 25: Magnetic stator lamination; 25a: Magnetic protrusion; 25b: Magnetic recess; 26: Magnetic tooth; 27: Magnetic yoke; 30: Non-magnetic stator component; 30a: Through hole; 30b: Recess; 35: Non-magnetic stator lamination; 35a: Non-magnetic protrusion; 35b: Non-magnetic recess; 36: Non-magnetic tooth; 37: Non-magnetic yoke; 40: Laminated body; 50: Rotating body; L: Central axis.

Claims

1. A stator having: A stator body (10) having a yoke (11) and a plurality of teeth (12), the yoke (11) being an annulus or an arc forming part of the annulus, the plurality of teeth (12) extending radially inward from the yoke (11) toward the annulus; and Multiple coils (15) are wound around each of the teeth (12). The stator body (10) has one or more magnetic stator components (20) and one or more non-magnetic stator components (30). The magnetic stator component (20) is made of magnetic material. The non-magnetic stator component (30) is made of non-magnetic material. The stator body (10) is formed by stacking the magnetic stator component (20) and the non-magnetic stator component (30) along the central axis of the ring.

2. The stator according to claim 1, wherein, When viewed along the central axis (L) of the stator (1), the shape of the magnetic stator component (20) is different from that of the non-magnetic stator component (30).

3. The stator according to claim 1, wherein, The thicknesses of the magnetic stator component (20) and the non-magnetic stator component (30) in the stacked direction are different.

4. The stator according to claim 1, wherein, Regarding the thickness of the magnetic stator component (20) and the non-magnetic stator component (30) in the stacking direction, the thickness of the magnetic stator component (20) is thinner than the thickness of the non-magnetic stator component (30).

5. The stator according to claim 1, wherein, The non-magnetic stator component (30) has a plurality of through holes (30a) that extend in the direction in which the magnetic stator component (20) and the non-magnetic stator component (30) are stacked.

6. The stator according to claim 5, wherein, Each of the through holes (30a) is formed on the non-magnetic stator component (30) at a position corresponding to the yoke (11).

7. The stator according to claim 1, wherein, When either the magnetic stator component (20) or the non-magnetic stator component (30) is used as the first component, and the other component, which is different from the first component, is used as the second component, The stator body (10) has a stack (40) of at least two first components sandwiching at least one second component.

8. The stator according to claim 7, wherein, The stator body (10) is composed of two or more stacked bodies (40) stacked continuously.

9. The stator according to claim 1, wherein, The magnetic stator component (20) and the non-magnetic stator component (30) are stacked alternately one after another.

10. The stator according to claim 1, wherein, Each of the magnetic stator components (20) has a plurality of magnetic stator plates (25). The magnetic stator component (20) is formed by connecting the plurality of magnetic stator plates (25). Each of the magnetic stator plates (25) has a magnetic tooth (26) corresponding to the tooth (12) and a magnetic yoke (27) corresponding to a part of the yoke (11).

11. The stator according to claim 1, wherein, Each of the aforementioned non-magnetic stator components (30) has a plurality of non-magnetic stator laminations (35). The non-magnetic stator component (30) is formed by connecting the plurality of non-magnetic stator laminations (35). Each of the non-magnetic stator plates (35) has a non-magnetic tooth (36) corresponding to the tooth (12) and a non-magnetic yoke (37) corresponding to a part of the yoke (11).

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