Electric motor

Abstract

To provide an electric motor capable of utilizing characteristics of a three-dimensional magnetic pole structure even when a material that blocks flowing magnetic flux in a specific direction, such as an electromagnetic steel sheet, is used in an iron core.SOLUTION: The present invention is an electric motor 1000 having a three-dimensional magnetic pole structure, in which an iron core 211 in this electric motor 1000 includes a plurality of laminated electromagnetic steel sheets 2111 and a soft magnetic member 2112 abutting against the plurality of electromagnetic steel sheets 2111 and including a magnetic pole member 2112-1 serving as a mover magnetic pole.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an electric motor having a three-dimensional magnetic pole structure. [Background technology]

[0002] In order to improve the output of an electric motor, it is necessary to increase the number of magnetic fluxes generated in the gap between the armature and the mover. For this purpose, for example, Patent Document 1 discloses an electric motor with a three-dimensional magnetic pole structure. The electric motor disclosed in Patent Document 1 includes an armature having an armature coil, an iron core arranged facing the armature, and a mover having a plurality of magnetic pole blocks each including a plurality of permanent magnets surrounding the iron core with the surface facing the armature open, and in the magnetic pole blocks, the plurality of permanent magnets are arranged with the same magnetic pole facing the iron core, and each of the plurality of magnetic pole blocks is arranged so that the permanent magnets included in each of the magnetic pole blocks are adjacent to each other. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 7044844 (Patent Publication No. 2020-202746) Summary of the Invention [Problem to be solved by the invention]

[0004] Incidentally, the iron core of an electric motor with a three-dimensional magnetic pole structure is usually made of bulk pure iron or magnetic iron powder, because magnetic flux penetrates from three directions, the R direction (radial direction), the θ direction (circumferential direction), and the Z direction (rotation axis direction). However, if bulk pure iron is used for the iron core, so-called eddy currents are generated. Furthermore, if magnetic iron powder is used for the iron core, the magnetic permeability is low and the strength is inferior. On the other hand, if electromagnetic steel sheets, which are often used for the iron core of electric motors, are used to solve these problems by arranging them so that the Z direction is the normal line as in general electric motors, it becomes difficult to utilize the magnetic flux in the Z direction, and the characteristic of the three-dimensional magnetic pole structure, which can utilize magnetic flux from three directions, cannot be utilized.

[0005] The present invention has been made in consideration of the above-mentioned circumstances, and its purpose is to provide an electric motor that can take advantage of the characteristics of a three-dimensional magnetic pole structure even if a material that obstructs the flow of magnetic flux in a specified direction, such as an electromagnetic steel plate, is used as the iron core. [Means for solving the problem]

[0006] As a result of various investigations, the inventors have found that the above object can be achieved by the present invention described below. That is, an electric motor according to one aspect of the present invention comprises an armature having an armature coil, an iron core arranged facing the armature, and a mover including a plurality of magnetic pole blocks including a plurality of permanent magnets surrounding the iron core so that the surface facing the armature is open as a mover magnetic pole, the plurality of permanent magnets in the magnetic pole blocks are arranged with the same magnetic pole facing the iron core, each of the plurality of magnetic pole blocks is arranged side by side such that the permanent magnets included in each are adjacent to each other, and adjacent magnetic pole blocks are connected by contacting one surface of the permanent magnets with each other, and the iron core comprises a plurality of laminated electromagnetic steel plates and a soft magnetic material member having a magnetic pole member that abuts against the plurality of electromagnetic steel plates and becomes the mover magnetic pole.

[0007] Such an electric motor is a motor with a three-dimensional magnetic pole structure, and uses electromagnetic steel sheets for the iron core. Here, in the above electric motor, the iron core is in contact with multiple electromagnetic steel sheets and includes a soft magnetic material member including magnetic pole members that become mover magnetic poles, so that magnetic flux that does not easily flow through the multiple electromagnetic steel sheets can flow through the magnetic pole members, and the characteristics of the three-dimensional magnetic pole structure can be utilized even when electromagnetic steel sheets are used for the iron core.

[0008] In another aspect, in the electric motor described above, the soft magnetic material member further includes a pair of first and second extension members made of a soft magnetic material and arranged to face each other via the plurality of electromagnetic steel plates, and the magnetic pole member is a plate made of a soft magnetic material, and both ends of the magnetic pole member are connected to one ends of the first and second extension members to be integral with the first and second extension members. Preferably, the electric motor described above is a linear motor.

[0009] Such an electric motor can form a magnetic path that allows magnetic flux flowing from a plurality of permanent magnets to flow to the magnetic pole members that become the mover magnetic poles, and can therefore form a magnetic path that allows magnetic flux generated by the plurality of permanent magnets to flow to the armature.

[0010] In another aspect, in the electric motor described above, one of the plurality of permanent magnets abuts against the other end face of the plurality of electromagnetic steel plates that faces the one end face abutting against the magnetic pole member, the magnetic pole member is a plate-like member made of a soft magnetic material, and the soft magnetic material member further includes a plate-like member made of a soft magnetic material, one end of which is connected to the magnetic pole member, and the other end of which abuts against the one permanent magnet. Preferably, in the electric motor described above, the magnetic pole member and the abutment member are integrally formed. Preferably, the electric motor described above is a rotary motor.

[0011] Such an electric motor can form a magnetic path that allows magnetic flux flowing from a plurality of permanent magnets to flow to the magnetic pole members that become the mover magnetic poles, and can therefore form a magnetic path that allows magnetic flux generated by the plurality of permanent magnets to flow to the armature.

[0012] In another aspect, in the electric motor described above, one of the plurality of permanent magnets abuts against the other end surface of the plurality of electromagnetic steel plates that faces the one end surface abutting against the magnetic pole member, and the soft magnetic material member further includes a support member made of a soft magnetic material that supports the one permanent magnet, and a connecting member made of a soft magnetic material that connects the magnetic pole member and the support member, and the magnetic pole member, the connecting member, and the support member are integrally formed. Preferably, the electric motor described above is a rotary motor.

[0013] In such a motor, the single permanent magnet is disposed inside the soft magnetic material member, so there are fewer components from the back yoke to the air gap and it is easier to control the dimensional accuracy of the air gap, which is expected to improve product yields.

[0014] According to another aspect of the present invention, there is provided an electric motor comprising: an armature having an armature coil; an iron core arranged facing the armature; and a mover including a plurality of pole blocks each having a plurality of permanent magnets surrounding the iron core so that the surface facing the armature is open as a mover pole, the plurality of permanent magnets in the pole blocks are arranged with the same magnetic pole facing the iron core, the plurality of pole blocks are arranged side by side so that the permanent magnets included in each of the pole blocks are adjacent to each other, and the adjacent pole blocks are connected by contacting one surface of the permanent magnets with each other, and the iron core comprises a square-shaped soft magnetic material member having a recess whose bottom becomes the mover pole, and a plurality of magnetic wires arranged in the recess so that their end surfaces face the bottom surface of the recess. Preferably, the electric motor described above is a linear motor.

[0015] Such a motor is equipped with a three-dimensional magnetic pole structure, and multiple magnetic wires are used in the iron core. The magnetic wires only allow magnetic flux to flow in one direction along their longitudinal direction, but in the above motor, the iron core is equipped with a square-shaped soft magnetic material member having a recess whose bottom becomes the mover magnetic pole, so that magnetic flux that is difficult to flow through the multiple magnetic wires can flow through the square-shaped soft magnetic material member, and the characteristics of the three-dimensional magnetic pole structure can be utilized even when magnetic wires are used in the iron core. Effect of the Invention

[0016] The electric motor according to the present invention can utilize the characteristics of the three-dimensional magnetic pole structure even if a member that blocks the flow of magnetic flux in a predetermined direction, such as an electromagnetic steel sheet, is used for the iron core. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a diagram for explaining an electric motor in the first embodiment. [Diagram 2] FIG. 2 is a diagram for explaining an iron core of the electric motor shown in FIG. [Diagram 3] 3 is a diagram for explaining magnetic flux in the iron core shown in FIG. 2. [Figure 4] FIG. 11 is a diagram for explaining an electric motor in a second embodiment. [Diagram 5] 5 is a diagram for explaining a magnetic pole block of the electric motor shown in FIG. 4. [Figure 6] 6 is a diagram for explaining magnetic flux in the iron core shown in FIG. 5. FIG. [Figure 7] FIG. 11 is a diagram for explaining an electric motor in a third embodiment. [Figure 8] 8 is a diagram for explaining an iron core of the electric motor shown in FIG. 7. [Figure 9] FIG. 11 is a diagram for explaining an iron core in a first modified embodiment. [Figure 10] 10 is a diagram for explaining magnetic flux in the iron core shown in FIG. [Figure 11] 6A and 6B are diagrams for explaining the function and effect of the iron core in the first modified embodiment. [Figure 12] FIG. 11 is a diagram for explaining an iron core in a second modified embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] Hereinafter, one or more embodiments of the present invention will be described with reference to the drawings. However, the scope of the invention is not limited to the disclosed embodiments. In addition, configurations with the same reference numerals in each drawing indicate that they are the same configurations, and their description will be omitted as appropriate. In this specification, when referring to a general term, a reference numeral without a subscript is used, and when referring to an individual configuration, a reference numeral with a subscript is used.

[0019] The electric motor (motor) in the embodiment includes an armature having an armature coil, an iron core arranged facing the armature, and a mover including a plurality of magnetic pole blocks including a plurality of permanent magnets surrounding the iron core so that the surface facing the armature is open as a mover magnetic pole. The plurality of permanent magnets in the magnetic pole blocks are arranged with the same magnetic pole facing the iron core, and each of the plurality of magnetic pole blocks is arranged so that the permanent magnets included in each of the magnetic pole blocks are adjacent to each other, and the magnetic pole blocks adjacent to each other are connected by contacting one surface of the permanent magnets with each other. Thus, the electric motor in the embodiment includes a three-dimensional magnetic pole structure. In the electric motor in the embodiment, the iron core includes a plurality of laminated electromagnetic steel plates and a soft magnetic material member having a magnetic pole member that abuts against the plurality of electromagnetic steel plates and becomes the mover magnetic pole. Hereinafter, such an electric motor will be described in more detail. (First embodiment) First, an electric motor 1000 in the first embodiment will be described. FIG. 1 is a diagram for explaining the electric motor in the first embodiment. FIG. 1A is an overall perspective view, FIG. 1B is a perspective view of a mover, and FIG. 1C is an exploded perspective view of a magnetic pole block. FIG. 1B illustrates the mover on the surface side facing the armature. FIG. 2 is a diagram for explaining the iron core of the electric motor shown in FIG. 1. FIG. 2 illustrates the iron core in a perspective view. FIG. 3 is a diagram for explaining magnetic flux in the iron core shown in FIG. 2. FIG. 3A is a diagram for explaining the flow of magnetic flux, and FIG. 3B is a diagram for explaining a portion where magnetic flux is concentrated. FIGS. 3A and 3B illustrate the iron core in a cross-sectional view of the RZ plane.

[0020] The electric motor 1000 in the first embodiment includes an armature 1 and a mover 2, as shown in Fig. 1 and Fig. 2, and in this embodiment, the mover 2 is a linear motor that moves linearly on the armature 1. In Fig. 1 to Fig. 3, an XYZ orthogonal coordinate system is set in which two mutually orthogonal line segments that form a moving plane are set as the X-axis and Y-axis, respectively, and a line segment along the normal direction of the moving plane is set as the Z-axis. In Fig. 1 to Fig. 3, for convenience of explanation, the X-direction is set as the left-right direction, the Y-direction is set as the front-rear direction, and the Z-direction is set as the up-down direction.

[0021] The armature 1 is a component that includes a plurality of armature coils and generates a magnetic field for linearly moving the mover 2 on the armature 1 by the plurality of armature coils. More specifically, the armature 1 functions as a stator in this embodiment, and includes, for example, as shown in Fig. 1A, a plate-shaped yoke portion 11, a plurality of columnar teeth portions (not shown) that are arranged at equal intervals in a two-dimensional array on one main surface (upper surface) of the yoke portion 11 and protrude upward from the one main surface, and a plurality of coils 13 that serve as the plurality of armature coils and are wound around the plurality of teeth portions, respectively. The yoke portion 11 and the teeth portions are formed integrally or in combination of a plurality of portions from a soft magnetic material such as soft iron or soft ferrite.

[0022] The mover 2 is a part that includes multiple magnetic pole blocks 21 and is movable by magnetic interaction between the magnetic fields generated by the armature 1 and the magnetic fields generated by the multiple magnetic pole blocks 21. More specifically, the mover 2 is plate-shaped and includes multiple magnetic pole blocks 21 and a back yoke 22, as shown in, for example, FIGS.

[0023] The back yoke 22 has a hollow rectangular parallelepiped shape with one main surface (top surface) open, and is made of a soft magnetic material similar to the yoke portion 11. Within the back yoke 22, a plurality of magnetic pole blocks 21 are arranged sequentially in the X direction while abutting against each other, and a plurality of magnetic pole blocks 21 are arranged sequentially in the Y direction while abutting against each other, so that a plurality of magnetic pole blocks 21 (21-11 to 21-44) are arranged in a two-dimensional array.

[0024] Each of the multiple magnetic pole blocks 21 includes an iron core 211 arranged facing the armature 1, and multiple permanent magnets 212 (212-1 to 212-4), 213 surrounding the iron core 211 so that the surface facing the armature 1 is open as a mover magnetic pole, as shown in Figures 1C and 2. The multiple permanent magnets 212, 213 in the magnetic pole block 21 are arranged with the same magnetic pole facing the iron core 211, and each of the multiple magnetic pole blocks 21 is arranged side by side with the permanent magnets 212, 213 included in each of the multiple magnetic pole blocks 21 adjacent to each other, and adjacent magnetic pole blocks 21 are connected with one surface of the permanent magnets 212, 213 in contact with each other. More specifically, the iron core 211 is a hexahedron having a rectangular parallelepiped or cubic shape, and the multiple permanent magnets 212, 213 include a first permanent magnet 212 arranged on the bottom surface of the iron core 211 and second permanent magnets 213 (213-1 to 213-4) arranged on each of the four side surfaces of the iron core 211. Each of the multiple permanent magnets 212, 213 has a rectangular parallelepiped or cubic shape. Such a magnetic pole block 21 is configured to increase the magnetic flux generated in the gap (air gap) between the armature 1 and the mover 2, and is disclosed, for example, in Japanese Patent No. 6835692 (JP Patent Publication No. 2019-75848 A) and the above-mentioned Patent Document 1.

[0025] 2, the iron core 211 includes a plurality of stacked electromagnetic steel sheets 2111 and a soft magnetic material member 2112 including a magnetic pole member 2112-1 that abuts against the plurality of electromagnetic steel sheets 2111 and serves as the mover magnetic pole. The plurality of electromagnetic steel sheets 2111 are plate-shaped, stacked in the Y direction, and arranged so that the normal direction of the stacking surface is the Y direction. Therefore, each stacking surface is parallel to the ZX plane. The magnetic pole member 2112-1 is plate-shaped and made of a soft magnetic material, and abuts against each of the plurality of electromagnetic steel sheets 2111 at one end surface (one end surface in the Z direction (XY plane)) of the plurality of electromagnetic steel sheets 2111. The soft magnetic member 2112 is further provided with a pair of plate-like first and second extension members 2112-2, 2112-3 that are formed of a soft magnetic material and are arranged to face each other in the stacking direction (Y direction) via the plurality of electromagnetic steel sheets 2111. The magnetic pole member 2112-1 is integrally formed with the first and second extension members 2112-2, 2112-3 by connecting both ends of the magnetic pole member 2112-1 to one ends of the first and second extension members 2112-2, 2112-3. That is, the soft magnetic member 2112 is substantially U-shaped, and the laminated plurality of electromagnetic steel sheets 2111 are disposed inside the soft magnetic member 2112. The soft magnetic member 2112 is formed, for example, by cutting bulk pure iron so as to have a substantially U-shaped configuration.

[0026] In the iron core 211 having such a configuration, for example, as shown in FIG. 3A , a first magnetic flux generated in the first permanent magnet 212 flows through the plurality of electromagnetic steel sheets 2111 and toward the armature 1 via the magnetic pole member 2112-1, a second A magnetic flux generated in the second permanent magnets 213-1, 213-3 that directly abut against the plurality of electromagnetic steel sheets 2111 flows through the plurality of electromagnetic steel sheets 2111 and toward the armature 1 via the magnetic pole member 2112-1, and a second B magnetic flux generated in the second permanent magnets 213-2, 213-4 that indirectly abut against the plurality of electromagnetic steel sheets 2111 via the first and second extension members 2112-2, 2112-3 flows through the first and second extension members 2112-2, 2112-3 and toward the armature 3 via the magnetic pole member 2112-1. Therefore, the electric motor 1000 in the first embodiment can take advantage of the characteristics of the three-dimensional magnetic pole structure even if an electromagnetic steel sheet is used for the iron core.

[0027] The thickness of the magnetic pole member 2112-1 in the soft magnetic material member 2112 may be designed appropriately depending on the required strength and the magnetic force of each permanent magnet 212, 213, etc., but in an iron core 211 configured as described above, for example, as shown in FIG. 3B, magnetic flux is concentrated at corner portions α1, α1 where the magnetic pole member 2112-1 in the soft magnetic material member 2112 is connected to the first and second extension members 2112-2, 2112-3 at approximately right angles, while the maximum magnetic flux density of a typical magnetic material is 2.0 to 2.2 [T], it is preferable to design the thickness so that the magnetic flux density of the corner portions α1, α1 is 2 [T] or less.

[0028] As described above, electric motor 1000 in the first embodiment is an electric motor with a three-dimensional magnetic pole structure, and electromagnetic steel sheets 2111 are used for iron core 211. Here, in electric motor 1000 in the first embodiment, iron core 211 is in contact with multiple electromagnetic steel sheets 2111 and includes soft magnetic material member 2112 including magnetic pole member 2112-1 that serves as a mover magnetic pole, so that magnetic flux that does not easily flow through the multiple electromagnetic steel sheets 2111 can be made to flow through magnetic pole member 2112-1, and the characteristics of the three-dimensional magnetic pole structure can be utilized even when electromagnetic steel sheets are used for the iron core.

[0029] As described above, the electric motor 1000 in the first embodiment can form a magnetic path so that the magnetic flux flowing from the multiple permanent magnets 212, 213 flows to the magnetic pole member 2112-1 which becomes the mover magnetic pole, and can therefore form a magnetic path so that the magnetic flux generated in the multiple permanent magnets 212, 213 flows to the armature 1.

[0030] Second embodiment Next, the electric motor 2000 in the second embodiment will be described. FIG. 4 is a diagram for explaining the electric motor in the second embodiment. FIG. 4A is an overall perspective view, FIG. 4B is a partial enlarged view of the part surrounded by a square in FIG. 4A, and FIG. 4C is a perspective view of the magnetic pole block. FIG. 5 is a diagram for explaining the magnetic pole block of the electric motor shown in FIG. 4. FIG. 5 shows the magnetic pole block in an exploded perspective view. FIG. 6 is a diagram for explaining the magnetic flux in the iron core shown in FIG. 5. FIG. 6A is a diagram for explaining the flow of the magnetic flux, and FIG. 6B is a diagram for explaining the part where the magnetic flux is concentrated. FIG. 6A and FIG. 6B show the magnetic pole block in a cross-sectional view of the RZ plane. In these FIG. 4 to FIG. 6, RθZ polar coordinates are set in which a line segment along the radial direction (R direction) is the R axis, a curved line along the circumferential direction (rotation direction, θ direction) is the θ axis, and a line segment along the axial direction (rotation axis direction, Z direction) is the Z axis.

[0031] The electric motor 2000 in the second embodiment includes an armature 3 and a mover 4, as shown in Figures 4 and 5, and in this embodiment is a radial gap inner rotor type in which the mover 4 is rotatably arranged inside the armature 3.

[0032] The armature 3 is a component that includes a plurality of armature coils and generates a magnetic field for rotating the mover 4 by the plurality of armature coils. More specifically, the armature 3 functions as a stator in this embodiment, and includes, for example, as shown in Fig. 4A, an annular (cylindrical) yoke portion, a plurality of columnar teeth portions that are arranged at equal intervals in the circumferential direction on the inner peripheral surface of the yoke portion and protrude radially inward (toward the center) from the inner peripheral surface, and a plurality of coils that serve as the plurality of armature coils and are wound around each of the plurality of teeth portions. The yoke portion and the teeth portions are formed integrally or in combination of a plurality of portions from a soft magnetic material such as soft iron or soft ferrite.

[0033] The mover 4 is a part that includes a plurality of magnetic pole blocks 41, and is movable by magnetic interaction between the magnetic fields (rotating magnetic fields) generated by the armature 3 and the magnetic fields generated by the plurality of magnetic pole blocks 41. The mover 4 is fixedly attached to a cylindrical rotating shaft (output shaft) not shown. More specifically, the mover 4 functions as a rotor in this embodiment, and includes, for example, a plurality of magnetic pole blocks 41 and a back yoke 42, as shown in FIG. 4B.

[0034] Each of the magnetic pole blocks 41 includes, for example, an iron core 411 arranged facing the armature 3 as shown in FIG. 4C and FIG. 5, and a plurality of permanent magnets 412-414 surrounding the iron core 411 so that the surface facing the armature 3 is open as a mover magnetic pole. The plurality of permanent magnets 412-414 in the magnetic pole block 41 are arranged with the same magnetic pole facing the iron core 411, and each of the plurality of magnetic pole blocks 41 is arranged so that the permanent magnets 412-413 included in each of the magnetic pole blocks 41 are adjacent to each other, and adjacent magnetic pole blocks 41 are connected by contacting one surface of the permanent magnets 412-413 with each other. Each of the plurality of permanent magnets 412-414 has a rectangular parallelepiped or cubic shape. Such a magnetic pole block 41 is configured to increase the magnetic flux generated in the gap (air gap) between the armature 3 and the mover 4, and is disclosed, for example, in the above-mentioned documents. The back yoke 42 is an annular (cylindrical) member and is made of a soft magnetic material, similar to the yoke portion. The magnetic pole blocks 41 are arranged in sequence in the circumferential direction on the outer circumferential surface of the back yoke 42 while being in contact with each other.

[0035] More specifically, the multiple magnetic pole blocks 41 arranged sequentially in the circumferential direction are arranged in multiple rows (two rows in this example) in the axial direction (Z direction), the iron core 411 is roughly hexahedral, and the multiple permanent magnets 412, 413, 414 include a first permanent magnet (R magnet) 412 arranged on the radial surface (bottom surface) of the iron core 411, a second permanent magnet (θ magnet) 413 arranged on the circumferential surface (side surface) of the iron core 411, and a third permanent magnet (Z magnet) 414 arranged between each row. In the magnetic pole block 41, one circumferential side surface of the core 411 is surrounded by the second permanent magnet 413 of the magnetic pole block 41, and the other circumferential side surface of the magnetic pole block 41 is surrounded by the second permanent magnet 413 of another magnetic pole block 41 arranged adjacent to the magnetic pole block 41 in the circumferential direction, as a result of the multiple magnetic pole blocks 41 being arranged sequentially on the outer circumferential surface of the back yoke 42. Therefore, in the example shown in Fig. 5, one magnetic core 411 is surrounded by the first to third permanent magnets 412, 413, 414 on four surfaces: the bottom surface, the two circumferential side surfaces, and the side surfaces between the rows.

[0036] As shown in Figs. 4A and 4B, the surface of the iron core 411 facing the armature 3 (the open surface where the permanent magnet is not in contact) is a curved surface that has a curvature in the circumferential direction and no curvature in the rotation axis direction (the radius of curvature is infinite). As shown in Figs. 5 and 6, for example, the iron core 411 includes a plurality of laminated electromagnetic steel sheets 4111 and a soft magnetic material member 4112 that abuts against the plurality of electromagnetic steel sheets 4111 and includes a magnetic pole member 4112-1 that becomes the mover magnetic pole. The plurality of electromagnetic steel sheets 4111 are plate-shaped, laminated in the axial direction (Z direction), and arranged so that the normal direction of the laminated surface is the axial direction. Therefore, each laminated surface is parallel to the Rθ plane. The other end face (the other end face in the radial direction) of the plurality of electromagnetic steel plates 4111, which faces the one end face (one end face in the radial direction) that contacts the magnetic pole member 4112-1, contacts one of the plurality of permanent magnets 412-414, i.e., the first permanent magnet (R magnet) 412. In this embodiment, the magnetic pole member 4112-1 is a plate-like member made of a soft magnetic material, and the soft magnetic material member 4112 further includes a contact member 4112-2 that is a plate-like member made of a soft magnetic material, is connected to the magnetic pole member 4112-1 at one end, and contacts the one permanent magnet, i.e., the first permanent magnet (R magnet) 412, at the other end, and the magnetic pole member 4112-1 and the contact member 4112-2 are integrally formed. Therefore, the soft magnetic material member 4112 is substantially L-shaped. The soft magnetic member 4112 is formed, for example, by cutting bulk pure iron into a substantially L-shape. One side surface in the stacking direction (axial direction) of the plurality of electromagnetic steel sheets 4111 abuts against the axial side surface (inner surface) of the abutting member 4112-2, and the other side surface in the stacking direction (axial direction) of the plurality of electromagnetic steel sheets 4111 is open. Both side surfaces in the circumferential direction of the plurality of electromagnetic steel sheets 4111 abut against second permanent magnets (θ magnets) 413, 413, respectively.

[0037] 6A, for example, in the iron core 411 configured as above, a first magnetic flux generated in the first permanent magnet (R magnet) 412 flows through the plurality of electromagnetic steel sheets 4111 and heads toward the armature 3 via the magnetic pole member 4112-1, a second magnetic flux generated in the second permanent magnet (θ magnet) 413 flows through the plurality of electromagnetic steel sheets 4111 and heads toward the armature 3 via the magnetic pole member 4112-1, and a third magnetic flux generated in the third permanent magnet (Z magnet) 414 flows through the contact member 4112-2 and heads toward the armature 3 via the magnetic pole member 4112-1. Therefore, the electric motor 2000 in the second embodiment can utilize the characteristics of the three-dimensional magnetic pole structure even if electromagnetic steel sheets are used for the iron core.

[0038] The thicknesses of the magnetic pole member 4112-1 and the abutment member 4112-2 in the soft magnetic material member 4112 may be designed appropriately depending on the required strength and the magnetic force of each permanent magnet 412-414, but in an iron core 411 configured as described above, for example, as shown in FIG. 6B, magnetic flux is concentrated at corner portion α2 where the magnetic pole member 4112-1 and the abutment member 4112-2 in the soft magnetic material member 4112 are connected at approximately a right angle. However, since the maximum magnetic flux density of a typical magnetic material is 2.0 to 2.2 [T], it is preferable that each thickness is designed so that the magnetic flux density of the corner portion α2 is 2 [T] or less.

[0039] Such electric motor 2000 in the second embodiment is an electric motor with a three-dimensional magnetic pole structure, and electromagnetic steel sheets 4111 are used for the iron core 411. Here, in the electric motor 2000 in the second embodiment, similarly to the electric motor 1000 in the first embodiment, the iron core 411 is in contact with the plurality of electromagnetic steel sheets 4111 and includes a soft magnetic material member 4112 including a magnetic pole member 4112-1 that serves as a mover magnetic pole, so that magnetic flux that has difficulty flowing through the plurality of electromagnetic steel sheets 4111 can be made to flow through the magnetic pole member 4112-1, and the characteristics of the three-dimensional magnetic pole structure can be utilized even when electromagnetic steel sheets are used for the iron core.

[0040] As described above, the electric motor 2000 in the second embodiment can form a magnetic path so that the magnetic flux flowing from the multiple permanent magnets 412-414 flows to the magnetic pole member 4112-1 which becomes the mover magnetic pole, and can therefore form a magnetic path so that the magnetic flux generated by the multiple permanent magnets 412-414 flows to the armature 3.

[0041] Third embodiment Next, an electric motor 3000 according to a third embodiment will be described. Fig. 7 is a diagram for explaining an electric motor according to the third embodiment. Fig. 7A is an overall perspective view, Fig. 7B is a perspective view of a mover, and Fig. 7C is a perspective view of a magnetic pole block. Fig. 8 is a diagram for explaining an iron core of the electric motor shown in Fig. 7. In Figs. 7 and 8, RθZ polar coordinates are set in which a line segment along the radial direction (R direction) is the R axis, a curved line along the circumferential direction (rotation direction, θ direction) is the θ axis, and a line segment along the rotation axis direction (Z direction) is the Z axis.

[0042] The electric motor 3000 in the third embodiment includes an armature 5 and a mover 6, as shown in Figures 7 and 8, and in this embodiment, the armature 5 and the mover 6 are of an axial gap type in which the armature 5 and the mover 6 are arranged at a predetermined interval in the axial direction.

[0043] The armature 5 is a component that includes a plurality of armature coils and generates a magnetic field for rotating the mover 6 by the plurality of armature coils. More specifically, the armature 5 functions as a stator in this embodiment, and includes, for example, a disk-shaped yoke portion, a plurality of columnar teeth portions that are arranged at equal intervals in the circumferential direction on one main surface of the yoke portion and protrude from the one main surface in the axial direction, and a plurality of coils that serve as the plurality of armature coils and are wound around the plurality of teeth portions, respectively, as shown in FIG. The yoke portion and the teeth portions are formed integrally or in combination of a plurality of portions from a soft magnetic material such as soft iron or soft ferrite. A circular through opening is formed in the center of the yoke portion for inserting a cylindrical rotating shaft (output shaft) (not shown).

[0044] The mover 6 is a part that includes a plurality of magnetic pole blocks 61, and is movable by magnetic interaction between the magnetic fields (rotating magnetic fields) generated by the armature 5 and the magnetic fields generated by the plurality of magnetic pole blocks 61. The mover 6 is fixedly attached to the rotation shaft (not shown). More specifically, the mover 6 functions as a rotor in this embodiment, and includes, for example, a plurality of magnetic pole blocks 61 and a back yoke 62, as shown in Figs. 7B and 7C.

[0045] The back yoke 62 is a disk-shaped member and is made of a soft magnetic material, similar to the yoke portion. The magnetic pole blocks 61 are arranged in sequence in the circumferential direction while being in contact with one main surface of the back yoke 62. A circular through opening is formed in the center of the back yoke 62 for inserting the unillustrated rotating shaft therethrough and for fixedly attaching the back yoke 62 to the rotating shaft.

[0046] Each of the magnetic pole blocks 61 includes an iron core 611 (611-1, 611-2) arranged facing the armature 5, and a plurality of permanent magnets 612, 613 (613-1, 613-2), 614 (614-1, 614-2) surrounding the iron core 611 so that the surface facing the armature 5 is open as a mover magnetic pole, as shown in, for example, Figures 7B, 7C and 8. The plurality of permanent magnets 612-614 in the magnetic pole block 61 are arranged with the same magnetic pole facing the iron core 611, and each of the magnetic pole blocks 61 is arranged so that the permanent magnets 612-613 included in each of the magnetic pole blocks 61 are adjacent to each other, and adjacent magnetic pole blocks 61 are connected with one surface of the permanent magnets 612-613 in contact with each other. Such a magnetic pole block 61 is configured to increase the magnetic flux generated in the gap (air gap) between the armature 5 and the mover 6, and is disclosed in, for example, the above-mentioned documents.

[0047] More specifically, the multiple magnetic pole blocks 61 arranged sequentially in the circumferential direction are arranged in multiple rows (two rows in this example) in the radial direction (R direction). The iron core 611-1 in the magnetic pole block 61 arranged in the row on the outer periphery is a roughly hexahedron with an arc shape in the Rθ cross section with a part of a sector cut out, and the multiple permanent magnets 612, 613-1, 614-1 include a first permanent magnet (R magnet) 612 arranged between each row, a second permanent magnet (θ magnet) 613-1 arranged on the surface (side surface) in the circumferential direction (θ direction) of the iron core 611-1, and a third permanent magnet (Z magnet) 614-1 arranged on the surface (bottom surface) in the axial direction (Z direction) of the iron core 611-1. The second permanent magnet 613-1 is rectangular parallelepiped-shaped, and the third permanent magnet 614-1 is plate-shaped in the same shape as the iron core 611-1 in the Rθ cross section. The iron core 611-2 in the magnetic pole block 61 arranged in the inner circumferential row is roughly hexahedral with the fan-shaped tip portion cut out, and the multiple permanent magnets 612, 613-2, 614-2 include the first permanent magnet (R magnet) 612 arranged between each row, the second permanent magnet (θ magnet) 613-2 arranged on the circumferential surface (side surface) of the iron core 611-2, and the third permanent magnet (Z magnet) 614-2 arranged on the axial (Z direction) surface (bottom surface) of the iron core 611-2. The second permanent magnet 613-2 is rectangular parallelepiped-shaped, and the third permanent magnet 614-2 is plate-shaped in the same shape as the iron core 611-2 in the Rθ cross section. In the pole block 61 in the outer circumferential row, one circumferential side surface of the core 611-1 is surrounded by the second permanent magnet 613-1 of the pole block 61, and the other circumferential side surface of the core 611-1 is surrounded by the second permanent magnet 613-1 of another pole block 61 arranged adjacent to the pole block 61 in the circumferential direction, as the multiple pole blocks 61 are arranged sequentially in the circumferential direction. Therefore, in the example shown in Fig. 7, one iron core 611-1 is surrounded by the first to third permanent magnets 612, 613-1, 614-1 on four surfaces: the bottom surface, the two circumferential side surfaces, and the side surfaces between the rows.Similarly, in the pole block 61 in the inner circumferential row, one circumferential side surface of the core 611-2 is surrounded by the second permanent magnet 613-2 of the pole block 61, and the other circumferential side surface of the core 611-2 is surrounded by the second permanent magnet 613-2 of another pole block 61 arranged adjacent to the pole block 61 in the circumferential direction, as a result of the multiple pole blocks 61 being arranged sequentially in the circumferential direction. Therefore, in the example shown in Fig. 7, one iron core 611-2 is surrounded by the first to third permanent magnets 612, 613-2, 614-2 on four surfaces: the bottom surface, the two circumferential side surfaces, and the side surfaces between the rows. The first permanent magnets 612 between the rows are shared (common) by the magnetic pole blocks 61 arranged in the row on the outer periphery and the magnetic pole blocks 61 arranged in the row on the inner periphery, and the first permanent magnets 612 are roughly hexahedrons with an arc shape in Rθ cross section, with a portion of a sector cut out.

[0048] The surface (open surface where the permanent magnet is not in contact) of the core 611-1 of the magnetic pole block 61 arranged in the outer circumferential row facing the armature 5 is a curved surface that has a curvature in the circumferential direction and no curvature in the axial direction (the radius of curvature is infinite) as shown in Fig. 7C and Fig. 8. The core 611-1, like the core 211 of the second embodiment, includes a plurality of laminated electromagnetic steel sheets 6111-1 and a soft magnetic material member 6112-1 including a magnetic pole member 6112-11 that abuts against the plurality of electromagnetic steel sheets 6111-1 and becomes the mover magnetic pole, as shown in Fig. 8, for example. The plurality of electromagnetic steel sheets 6111-1 are plate-shaped, laminated in the radial direction (R direction), and arranged so that the normal direction of the laminated surface is the radial direction. Therefore, each laminated surface is parallel to the θZ plane. The other end face (the other end face in the axial direction) of the plurality of electromagnetic steel plates 6111-1, which faces the one end face (one end face in the axial direction (Z direction)) that abuts against the magnetic pole member 6112-11, abuts against one of the plurality of permanent magnets 612, 613-1, 614-1, i.e., the third permanent magnet (Z magnet) 614-1. In this embodiment, the magnetic pole member 6112-11 is a plate-like member made of a soft magnetic material, and the soft magnetic material member 6112-1 further includes a plate-like member made of a soft magnetic material, which is connected to the magnetic pole member 6112-11 at one end and abuts against the one permanent magnet, i.e., the third permanent magnet (Z magnet) 614-1 at the other end, and the magnetic pole member 6112-11 and the abutment member 6112-12 are integrally formed. Therefore, the soft magnetic material member 6112-1 is substantially L-shaped. One side surface of the plurality of electromagnetic steel sheets 6111-1 in the stacking direction (R direction) abuts against the radial side surface (inner side surface) of the abutting member 6112-12, and the other side surface of the plurality of electromagnetic steel sheets 6111-1 in the stacking direction (R direction) is open. Both side surfaces of the plurality of electromagnetic steel sheets 6111-1 in the circumferential direction (θ direction) abut against second permanent magnets (θ magnets) 613-1, 613-1, respectively.

[0049] Similarly, the surface (open surface where the permanent magnet is not in contact) of the iron core 611-2 of the magnetic pole block 61 arranged in the inner circumferential row facing the rotation shaft (not shown) is a curved surface that has a curvature in the circumferential direction and no curvature in the axial direction (the radius of curvature is infinite) as shown in Fig. 7C and Fig. 8. The iron core 611-2, like the iron core 211 of the second embodiment, includes a plurality of laminated electromagnetic steel sheets 6111-2 and a soft magnetic material member 6112-2 including a magnetic pole member 6112-21 that abuts against the plurality of electromagnetic steel sheets 6111-2 and becomes the mover magnetic pole, as shown in Fig. 8, for example. The plurality of electromagnetic steel sheets 6111-2 are plate-shaped, laminated in the radial direction (R direction), and arranged so that the normal direction of the laminated surface is the radial direction. Therefore, each laminated surface is parallel to the θZ plane. The other end face (the other end face in the axial direction) of the plurality of electromagnetic steel plates 6111-2, which faces the one end face (one end face in the axial direction (Z direction)) that abuts against the magnetic pole member 6112-21, abuts against one of the plurality of permanent magnets 612, 613-2, 614-2, i.e., the third permanent magnet (Z magnet) 614-2. In this embodiment, the magnetic pole member 6112-21 is a plate-like member made of a soft magnetic material, and the soft magnetic material member 6112-2 further includes a plate-like member made of a soft magnetic material, which is connected to the magnetic pole member 6112-21 at one end and abuts against the one permanent magnet, i.e., the third permanent magnet (Z magnet) 614-2, at the other end, and the magnetic pole member 6112-21 and the abutting member 6112-22 are integrally formed. Therefore, the soft magnetic material member 6112-2 is substantially L-shaped. The soft magnetic material member 6112 (6112-1, 6112-2) is formed, for example, by cutting bulk pure iron so as to have a substantially L-shape. One side surface in the lamination direction of the plurality of electromagnetic steel sheets 6111-2 abuts against the radial side surface (inner surface) of the abutment member 6112-22, and the other side surface in the lamination direction of the plurality of electromagnetic steel sheets 6111-2 is open. Both side surfaces in the circumferential direction of the plurality of electromagnetic steel sheets 6111-2 abut against the second permanent magnets (θ magnets) 613-2, 613-2, respectively.

[0050] The electric motor 2000 in the second embodiment is a radial gap type, while the electric motor 3000 in the third embodiment is an axial gap type. However, the electric motor 3000 in the third embodiment has the same effects as the electric motor 2000 in the second embodiment.

[0051] (First variant) Next, the first modified embodiment will be described. FIG. 9 is a diagram for explaining the iron core in the first modified embodiment. FIG. 9A is a perspective view of the magnetic pole block 41 using the iron core 411a in the first modified embodiment, and FIG. 9A is a perspective view of the soft magnetic material member 4112a in the iron core 411a in the first modified embodiment. FIG. 10 is a diagram for explaining the magnetic flux in the iron core shown in FIG. 9. FIG. 10A is a diagram for explaining the flow of the magnetic flux, and FIG. 10B is a diagram for explaining the part where the magnetic flux is concentrated. In FIG. 10A and FIG. 10B, the magnetic pole block is illustrated in a cross-sectional view of the RZ plane. In these FIG. 9 and FIG. 10, RθZ polar coordinates are set in which a line segment along the radial direction (R direction) is the R axis, a curved line along the circumferential direction (rotation direction, θ direction) is the θ axis, and a line segment along the axial direction (rotation axis direction, Z direction) is the Z axis. FIG. 11 is a diagram for explaining the action and effect of the iron core in the first modified embodiment. FIG. 11A shows the case of the first modified embodiment, and FIG. 11B shows the case of the comparative example.

[0052] In the electric motor 2000 in the second embodiment, an iron core 411 is used, but in this first modified embodiment, an iron core 411a is used instead of the iron core 411. More specifically, the electric motor 2000 in the first modified embodiment includes an armature 3 having an armature coil, an iron core 411a arranged facing the armature 3, and a mover 4 including a plurality of magnetic pole blocks 41 having a plurality of permanent magnets 412-414 surrounding the iron core 411a so that the surface facing the armature 3 is open as a mover magnetic pole, the plurality of permanent magnets 412-414 in the magnetic pole block 41 are arranged with the same magnetic pole facing the iron core 411a, the plurality of magnetic pole blocks 41 are arranged side by side such that the permanent magnets 412-414 included in each of the plurality of magnetic pole blocks 41 are adjacent to each other, and the magnetic pole blocks 41 adjacent to each other are connected with one surface of the permanent magnets 412-414 in contact with each other.

[0053] 9 and 10, the iron core 411a includes a plurality of laminated electromagnetic steel sheets 4111, and a soft magnetic member 4112a including a magnetic pole member 4112a-1 that serves as the mover magnetic pole and abuts against the plurality of electromagnetic steel sheets 4111. The other end faces (other radial end faces) of the plurality of electromagnetic steel sheets 4111 that face one end face (one radial end face) that abuts against the magnetic pole member 4112a-1 abuts against one of the plurality of permanent magnets 412-414, i.e., the first permanent magnet (R magnet) 412. In the first modified embodiment, the soft magnetic member 4112a further includes a plate-shaped support member 4112a-3 made of a soft magnetic material and supporting the one permanent magnet 412, and a plate-shaped connecting member 4112a-2 made of a soft magnetic material and connecting the magnetic pole member 4112a-1 and the support member 4112a-3, and the magnetic pole member 4112a-1, the connecting member 4112a-2, and the support member 4112a-3 are integrally formed. Therefore, the soft magnetic member 4112a is substantially U-shaped. In the example shown in FIG. 9 and FIG. 10, the connecting member 4112a-2 is formed with a recess SR recessed in the Z direction, and one end portion of the one permanent magnet 412 is fitted into the recess SR. The soft magnetic member 4112a is formed, for example, by cutting bulk pure iron so as to have a substantially U-shaped shape with the recess SR formed therein. One side surface in the stacking direction (axial direction) of the plurality of electromagnetic steel sheets 4111 abuts against the axial side surface (inner surface) of the connecting member 4112a-2, and the other side surface in the stacking direction (axial direction) of the plurality of electromagnetic steel sheets 4111 is open. Both side surfaces in the circumferential direction of the plurality of electromagnetic steel sheets 4111 abut against second permanent magnets (θ magnets) 413, 413, respectively.

[0054] 10A, for example, in the iron core 411a configured as above, a first magnetic flux generated in the first permanent magnet (R magnet) 412 flows through the plurality of electromagnetic steel sheets 4111 and heads toward the armature 3 via the magnetic pole member 4112a-1, a second magnetic flux generated in the second permanent magnet (θ magnet) 413 flows through the plurality of electromagnetic steel sheets 4111 and heads toward the armature 3 via the magnetic pole member 4112a-1, and a third magnetic flux generated in the third permanent magnet (Z magnet) 414 flows through the connecting member 4112a-2 and heads toward the armature 3 via the magnetic pole member 4112a-1. Therefore, the electric motor 2000 in the first modified embodiment can utilize the characteristics of the three-dimensional magnetic pole structure even if electromagnetic steel sheets are used for the iron core.

[0055] The thicknesses of the magnetic pole member 4112a-1, the connecting member 4112a-2 and the supporting member 4112a-3 in the soft magnetic member 4112a may be appropriately designed according to the required strength and the magnetic force of each permanent magnet 412-414, but in the iron core 411a having such a configuration, for example, as shown in Fig. 10B, magnetic flux concentrates at a corner portion α3 where the magnetic pole member 4112a-1 and the connecting member 4112a-2 in the soft magnetic member 4112a are connected at a substantially right angle, while the maximum magnetic flux density of a general magnetic material is 2.0-2.2 [T], so it is preferable that each thickness is designed so that the magnetic flux density of the corner portion α2 is 2 [T] or less. The thickness of the portion β1 where the recess SR is formed in the connecting member 4112a-2 is preferably as thin as possible because it becomes leakage magnetic flux, and is preferably as thin as possible to ensure the required strength.

[0056] In the comparative example shown in FIG. 11B, from the back yoke to the air gap, there are four components: a first adhesive layer between the back yoke and the second permanent magnet, the second permanent magnet, a second adhesive layer between the second permanent magnet and the iron core, and the iron core. On the other hand, in the first modified form, as shown in FIG. 11A, from the back yoke to the air gap, there are two components: an adhesive layer between the back yoke and the iron core 411a and the iron core 411a. Therefore, the electric motor 2000 in the first modified form has fewer components from the back yoke to the air gap compared to the comparative example, and the machining accuracy of the permanent magnet is not affected, making it easier to manage the dimensional accuracy of the air gap. Therefore, an improvement in product yield can be expected.

[0057] (Second variant) Next, the second modified embodiment will be described. Fig. 12 is a diagram for explaining the iron core in the second modified embodiment. Fig. 12A is an external perspective view, Fig. 12B is a perspective view illustrating a plurality of magnetic wires arranged inside the soft magnetic material member so that they can be seen through, Fig. 12C is a plan view seen from the open surface side of the recess, and Fig. 12D is a perspective view of the soft magnetic material member.

[0058] In the electric motor 1000 in the first embodiment, a plate-shaped electromagnetic steel sheet 2111 is used, but in the second modified embodiment, a magnetic wire 2111a is used. More specifically, the electric motor 1000 in the second modified embodiment includes an armature 1 having an armature coil, an iron core 211a arranged facing the armature 1, and a mover 2 having a plurality of magnetic pole blocks 21 having a plurality of permanent magnets 212, 213 surrounding the iron core 211a so that the surface facing the armature 1 is open as a mover magnetic pole, the plurality of permanent magnets 212, 213 in the magnetic pole block 21 are arranged with the same magnetic pole facing the iron core 211a, each of the plurality of magnetic pole blocks 21 is arranged side by side such that the permanent magnets 212, 213 included in each of the magnetic pole blocks 21 are adjacent to each other, and the magnetic pole blocks 21 adjacent to each other are connected by contacting one surface of the permanent magnets 212, 213 with each other. That is, in the electric motor 1000 in the first embodiment, an iron core 211a is used in the second modified embodiment instead of the iron core 211. The iron core 211a includes, for example, as shown in FIG. 12, a square-shaped soft magnetic member 2112a having a recess AR whose bottom becomes the mover magnetic pole, and a plurality of magnetic wires 2111a arranged in the recess AR so that their end faces face the bottom surface of the recess AR. The soft magnetic member 2112a is made of a soft magnetic material, and is formed, for example, by cutting bulk pure iron to form the recess AR. The plurality of magnetic wires 2111a are arranged in the recess AR along the Z direction and so as to fill the recess AR. It is preferable that the cross section (cross section in the XY plane) of the magnetic wires 2111a is a regular polygon such as an equilateral triangle, a regular square, or a regular hexagon so as to fill the recess AR without any gaps.

[0059] In this second modified embodiment, the first magnetic flux generated in the first permanent magnet 212 flows through the multiple magnetic wires 2111a and heads toward the armature 1 via the bottom (bottom surface portion) of the soft magnetic material member 2112a, and the second magnetic flux generated in the second permanent magnets 213 (213-1 to 213-4) flows through the side (side surface portion) of the soft magnetic material member 2112a and heads toward the armature 1 via the bottom of the soft magnetic material member 2112a.

[0060] The electric motor 1000 in the second modified embodiment is an electric motor with a three-dimensional magnetic pole structure, and a plurality of magnetic wires 2111a are used in the iron core 211a. The magnetic wires 2111a only allow magnetic flux to flow in one direction along the longitudinal direction, but in the electric motor 1000 in the second modified embodiment, the iron core 211a includes a square-shaped soft magnetic material member 2112a having a recess whose bottom becomes the mover magnetic pole, so that magnetic flux that is difficult to flow through the plurality of magnetic wires 2111a can flow through the square-shaped soft magnetic material member 2112a, and the characteristics of the three-dimensional magnetic pole structure can be utilized even when magnetic wires are used in the iron core.

[0061] In order to express the present invention, the present invention has been described adequately and sufficiently through the embodiments with reference to the drawings in the above description, but it should be recognized that those skilled in the art can easily change and / or improve the above-mentioned embodiments. Therefore, unless the changes or improvements made by those skilled in the art are at a level that departs from the scope of the claims described in the claims, the changes or improvements are interpreted as being included in the scope of the claims. [Explanation of symbols]

[0062] 1000, 2000, 3000 electric motor 211, 211a, 411, 411a, 611 Iron core 2111, 4111, 6111 Electrical steel sheet 2112, 2112a, 4112, 4112a, 6112 Soft magnetic material parts 2112-1, 2112a-1, 4112-1, 4112a-1, 6112-1 Magnetic pole members 2112-2, 2112a-2, 4112-2, 4112a-2, 6112-2 Connecting members 4112a-3 Support member

Claims

1. the rotor includes an armature having an armature coil, an iron core arranged opposite the armature, and a mover including a plurality of magnetic pole blocks having a plurality of permanent magnets surrounding the iron core such that the surfaces facing the armature are open as mover magnetic poles; The plurality of permanent magnets in the magnetic pole block are arranged with the same magnetic poles facing the iron core, The plurality of magnetic pole blocks are arranged so that the permanent magnets included in each of the magnetic pole blocks are adjacent to each other, and adjacent magnetic pole blocks are connected to each other by contacting one surface of the permanent magnets with each other, The iron core includes a plurality of laminated electromagnetic steel plates, and a soft magnetic material member that is in contact with the plurality of electromagnetic steel plates and includes a magnetic pole member that serves as the mover magnetic pole. Electric motor.

2. The soft magnetic member further includes a pair of plate-shaped first and second extension members formed of a soft magnetic material and arranged to face each other with the plurality of electromagnetic steel plates interposed therebetween, The magnetic pole member is a plate-like member made of a soft magnetic material, and both ends of the magnetic pole member are connected to one ends of the first and second extension members, respectively, to be integrally formed with the first and second extension members.

2. The electric motor according to claim 1.

3. one of the plurality of permanent magnets abuts against the other end surface of the plurality of electromagnetic steel plates, the other end surface facing the one end surface abutting against the magnetic pole member; The magnetic pole member is a plate-like member made of a soft magnetic material, the soft magnetic member further includes a plate-like abutment member made of a soft magnetic material, the abutment member being connected to the magnetic pole member at one end and abutting against the one permanent magnet at the other end; 2. The electric motor according to claim 1.

4. one of the plurality of permanent magnets abuts against the other end surface of the plurality of electromagnetic steel plates, the other end surface facing the one end surface abutting against the magnetic pole member; The soft magnetic member further includes a support member made of a soft magnetic material that supports the one permanent magnet, and a connecting member made of a soft magnetic material that connects the magnetic pole member and the support member, and the magnetic pole member, the connecting member, and the support member are integrally formed.

2. The electric motor according to claim 1.

5. the rotor includes an armature having an armature coil, an iron core arranged opposite the armature, and a mover including a plurality of magnetic pole blocks having a plurality of permanent magnets surrounding the iron core such that the surfaces facing the armature are open as mover magnetic poles; The plurality of permanent magnets in the magnetic pole block are arranged with the same magnetic poles facing the iron core, The plurality of magnetic pole blocks are arranged so that the permanent magnets included in each of the magnetic pole blocks are adjacent to each other, and adjacent magnetic pole blocks are connected to each other by contacting one surface of the permanent magnets with each other, The iron core includes a square-shaped soft magnetic material member having a recess whose bottom becomes the mover magnetic pole, and a plurality of magnetic wires arranged in the recess such that their end faces face the bottom surface of the recess. Electric motor.

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