Electric motor

Abstract

To provide an electric motor that can utilize the characteristics of a three-dimensional magnetic pole structure even when using electromagnetic steel sheets for an iron core.SOLUTION: An electric motor 1000 according to the present invention has a three-dimensional magnetic pole structure, and its iron core 211a is composed of a plurality of laminated electromagnetic steel sheets 2111, and the lamination surfaces of the laminated electromagnetic steel sheets 2111 are inclined with respect to at least two of first to third magnetic flux directions, which are three different directions passing through the iron core 211a.SELECTED DRAWING: Figure 3

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 has an object to provide an electric motor that can take advantage of the characteristics of a three-dimensional magnetic pole structure even when using electromagnetic steel sheets for 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 includes an armature having an armature coil, an iron core arranged facing the armature, and a mover including a plurality of pole blocks including a plurality of permanent magnets surrounding the iron core so that a 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, each of the plurality of pole blocks is arranged side by side such that the permanent magnets included in each pole block are adjacent to each other, adjacent pole blocks are connected such that one surface of the permanent magnets is in contact with each other, the iron core is made of a plurality of laminated electromagnetic steel sheets, and lamination surfaces of the laminated electromagnetic steel sheets are inclined with respect to at least two of first to third magnetic flux directions, which are three different directions passing through the iron core, that is, first to third magnetic flux directions.

[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 electric motor, the lamination surfaces of the electromagnetic steel sheets are inclined with respect to at least two of the first to third magnetic flux directions, which are three different directions passing through the iron core, so that magnetic flux in the Z direction can enter the iron core, 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, lamination surfaces of the plurality of laminated electromagnetic steel sheets are inclined with respect to the first to third magnetic flux directions.

[0009] In such a motor, the lamination surfaces are inclined with respect to three magnetic flux directions, so that the direction of inclination can be dispersed in each direction, and the bias in the electromagnetic force can be reduced, compared to a case in which the lamination surfaces are inclined with respect to two magnetic flux directions.

[0010] In another aspect, in the electric motors described above, the laminated electromagnetic steel sheets have a plurality of portions with different inclination directions. Preferably, in the electric motors described above, the electromagnetic steel sheets in each of the portions are configured as separate bodies. Preferably, in the electric motors described above, the electromagnetic steel sheets in each of the portions are configured as an integral body.

[0011] Since such a motor has a plurality of portions with different inclination directions, it is easy to balance the magnetic flux distribution within the iron core, and bias in the applied electromagnetic force is unlikely to occur.

[0012] In another aspect, in the electric motor described above, the plurality of portions are arranged side by side in a circumferential direction. Preferably, in the electric motor described above, the plurality of portions are formed by bending each of the plurality of laminated electromagnetic steel sheets.

[0013] This makes it possible to provide an electric motor in which the multiple portions are arranged side by side in the circumferential direction.

[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 having 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 with the permanent magnets they comprise adjacent to each other, adjacent pole blocks are connected by contacting one surface of the permanent magnets with each other, the iron core is made of a plurality of laminated electromagnetic steel plates and is formed of a plurality of portions including portions with different lamination directions. Preferably, in the above-mentioned electric motor, the plurality of portions are arranged side by side in the direction of the rotation axis.

[0015] In this type of motor, the iron core is formed from multiple sections, including sections with different lamination directions, making it easier to pass magnetic flux in each direction. Even if electromagnetic steel sheets are used for the iron core, the characteristics of the three-dimensional magnetic pole structure can be utilized. 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 when using electromagnetic steel sheets for the iron core. [Brief description of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view showing a configuration of an electric motor according to an embodiment. [Diagram 2] FIG. 2 is a perspective view showing a configuration of a mover (rotor) in the electric motor. [Diagram 3] FIG. 2 is a diagram for explaining the configuration of an iron core in the first embodiment. [Figure 4] FIG. 11 is a diagram for explaining the configuration of one row of iron cores in the second embodiment. [Diagram 5] 10 is a diagram for illustrating a configuration of iron cores in the other row adjacent to the one row in the rotation axis direction in the second embodiment. FIG. [Figure 6]13 is a diagram for explaining the configuration of an iron core in a third embodiment. FIG. [Figure 7] 13 is a diagram for explaining the configuration of an iron core in a fourth embodiment. FIG. [Figure 8] 13A and 13B are diagrams for explaining the configuration of each iron core in the fifth and sixth embodiments. [Figure 9] FIG. 13 is a diagram for explaining the configuration of an iron core in a seventh embodiment. [Figure 10] FIG. 13 is a diagram for explaining the configuration of an iron core in an eighth 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 is made of a plurality of laminated electromagnetic steel sheets, and the lamination surfaces of the laminated electromagnetic steel sheets are inclined with respect to at least two magnetic flux directions among three different first to third magnetic flux directions passing through the iron core. Hereinafter, such an electric motor will be described in more detail.

[0020] Fig. 1 is a perspective view showing the configuration of an electric motor in an embodiment. Fig. 2 is a perspective view showing the configuration of a rotor in the electric motor. Fig. 2A is an overall view, and Fig. 2B is a partially enlarged view of a part circled in Fig. 2A.

[0021] The electric motor 1000 in the embodiment includes an armature 1 and a mover 2, as shown in Figures 1 and 2, and in this embodiment is a radial gap inner rotor type in which the mover 2 is rotatably arranged inside the armature 1.

[0022] The armature 1 is a component that includes a plurality of armature coils and generates a magnetic field for rotating the mover 2 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. 1, 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 (towards the center) from the inner peripheral surface, and a plurality of coils that serve as the plurality of armature coils and are wound around the plurality of teeth portions, respectively. The yoke portion and the teeth portions are formed integrally or in combination of a plurality of pieces from a soft magnetic material such as soft iron or soft ferrite.

[0023] The mover 2 is a part that includes a plurality of magnetic pole blocks 21, and is movable by magnetic interaction between the magnetic fields (rotating magnetic fields) generated by the armature 1 and the magnetic fields generated by the plurality of magnetic pole blocks 21. The mover 2 is fixedly attached to a cylindrical rotating shaft (output shaft) not shown. More specifically, the mover 2 functions as a rotor in this embodiment, and includes, for example, a plurality of magnetic pole blocks 21 and a back yoke 22, as shown in FIG.

[0024] Each of the magnetic pole blocks 21 includes an iron core 211 arranged facing the armature 1, and a plurality of permanent magnets 212-214 surrounding the iron core 211 so that the surface facing the armature 1 is open as a mover magnetic pole. The permanent magnets 212-214 in the magnetic pole block 21 are arranged with the same magnetic pole facing the iron core 211, and each of the magnetic pole blocks 21 is arranged so that the permanent magnets 212-214 included in each of the magnetic pole blocks 21 are adjacent to each other, and adjacent magnetic pole blocks 21 are connected by contacting one surface of the permanent magnets 212-214 with each other. Each of the permanent magnets 212-214 has a rectangular parallelepiped or cubic shape. Such a magnetic pole block 21 has a configuration in which the magnetic flux is oriented as shown by the relatively thick arrow in FIG. 2B, and increases 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) and the above-mentioned Patent Document 1. The back yoke 22 is an annular (cylindrical) member and is formed of a soft magnetic material, similar to the yoke portion. The multiple magnetic pole blocks 21 are arranged sequentially in the circumferential direction on the outer circumferential surface of the back yoke 22.

[0025] More specifically, the multiple magnetic pole blocks 21 arranged sequentially in the circumferential direction are arranged in multiple rows in the rotation axis direction, the iron core 211 is substantially hexahedral, and the multiple permanent magnets 212 to 214 include a first permanent magnet (R magnet) 212 arranged on the bottom surface of the iron core 211, a second permanent magnet (θ magnet) 213 arranged on a side surface of the iron core 211 along the rotation direction, and a third permanent magnet (Z magnet) 214 arranged between each row. In the magnetic pole block 21, one side surface of the iron core 211 along the rotation direction is surrounded by the second permanent magnet 213 of the magnetic pole block 21, and the other side surface of the iron core 211 along the rotation direction is surrounded by the second permanent magnet 213 of another magnetic pole block 21 arranged adjacent to the magnetic pole block 21 in the circumferential direction by the multiple magnetic pole blocks 21 being arranged sequentially on the outer circumferential surface of the back yoke 22 in the circumferential direction. 2, one iron core 211 is surrounded on four sides, namely, a bottom side, two side sides along the rotation direction, and a side between the rows, by the first to third permanent magnets 212, 213, 214. In the example shown in FIG. 2, the multiple magnetic pole blocks 21 are arranged in two rows on the outer circumferential surface of the back yoke 22, but this is not limited thereto, and any number of multiple rows may be arranged on the outer circumferential surface of the back yoke 22.

[0026] As shown in Figs. 2A and 2B, the surface of the iron core 211 facing the armature 1 (the open surface where the permanent magnet is not in contact) is a curved surface that has a curvature in the circumferential direction and has no curvature in the rotation axis direction (the radius of curvature is infinite). As described above, the iron core 211 is substantially a hexahedron, but in this embodiment, a step is formed at each end of the iron core 211 in the rotation axis direction so that an annular fastener (not shown) that fastens the multiple magnetic pole blocks 21 is fitted in. In this embodiment, such an iron core 211 is made of multiple laminated electromagnetic steel sheets, and the lamination surfaces of the multiple laminated electromagnetic steel sheets are inclined with respect to at least two of the first to third magnetic flux directions, which are three different directions passing through the iron core 211. For example, the first magnetic flux direction is the R direction (radial direction), the second magnetic flux direction is the θ direction (circumferential direction), and the third magnetic flux direction is the Z direction (rotation axis direction).

[0027] More specifically, in this embodiment, the iron core 211 is configured in any one of the following first to eighth aspects.

[0028] FIG. 3 is a diagram for explaining the configuration of the iron core in the first embodiment. FIG. 4 is a diagram for explaining the configuration of the iron core in one row in the second embodiment. FIG. 5 is a diagram for explaining the configuration of the iron core in the other row adjacent to the one row in the rotation axis direction in the second embodiment. FIG. 6 is a diagram for explaining the configuration of the iron core in the third embodiment. FIG. 6A shows one iron core, and FIG. 6B shows multiple iron cores arranged on the back yoke 22. FIG. 7 is a diagram for explaining the configuration of the iron core in the fourth embodiment. FIG. 7A shows one iron core, and FIG. 7B shows multiple iron cores arranged on the back yoke 22. FIG. 8 is a diagram for explaining the configuration of each iron core in the fifth and sixth embodiments. FIG. 8A shows the iron core in the fifth embodiment, FIG. 8B shows the iron core in the sixth embodiment, and FIG. 8A and FIG. 8B show multiple iron cores arranged on the back yoke 22. FIG. 9 is a diagram for explaining the configuration of the iron core in the seventh embodiment. FIG. 10 is a diagram for explaining the configuration of the iron core in the eighth embodiment. FIG. 10A shows a plurality of iron cores arranged in the back yoke 22, and FIG. 10B shows one iron core. In these FIGS. 3 to 9 and FIG. 10B, the iron cores 211a to 211i are illustrated when viewed from the radially outer side to the radially inner side along the radial direction, as shown by the relatively thin arrows in FIG. 2B. For convenience of explanation, an xyz orthogonal coordinate system is set in each of these FIGS. 3 to 10, with the line segment along the tangential direction of the outer periphery of the mover 2 as the x-axis, the line segment along the R direction as the y-axis, and the line segment along the Z direction as the z-axis. In these FIGS. 3 to 10, the above-mentioned step portion shown in FIG. 2 is omitted for convenience of explanation.

[0029] The iron core (core) 211a of the first embodiment is composed of a plurality of laminated electromagnetic steel sheets 2111, as shown in FIG. 3, for example, and the lamination surface of the laminated electromagnetic steel sheets 2111 is inclined with respect to two magnetic flux directions, the θ direction and the Z direction. More specifically, the plurality of electromagnetic steel sheets 2111 are each plate-shaped, and the lamination surface is arranged along the R direction (y-axis direction), and the normal to the lamination surface is inclined from the Z direction by a predetermined inclination angle (first inclination angle) in the Zθ plane (zx plane) with a line segment (y-axis) along the R direction as the axis of rotation. In the example shown in FIG. 3, the first inclination angle is 45[degrees] counterclockwise from the Z direction in the Zθ plane (zx plane), and therefore the lamination surface is inclined 45[degrees] with respect to the x axis and 45[degrees] with respect to the z axis. In the xyz orthogonal coordinate system, the unit vector representing the normal direction of the lamination surface is (1, 0, 1). The first tilt angle is not limited to 45 degrees (1:1), and may be 0 degrees<the first tilt angle<90 degrees in the counterclockwise direction in the Zθ plane (zx plane) from the Z direction.

[0030] When the magnetic pole blocks 21 arranged sequentially in the circumferential direction are arranged in a plurality of rows in the rotation axis direction (Z direction), the plurality of electromagnetic steel sheets 2111 in the core 211a of each row may be arranged in the same manner, but from the viewpoint of exerting a balanced force, it is preferable that the plurality of electromagnetic steel sheets 2111 in two adjacent rows in the plurality of rows are arranged so that the θR plane (xy plane) between the two rows is the symmetric plane. In the example shown in Fig. 3, the plurality of electromagnetic steel sheets 2111 in one row of two adjacent rows in the plurality of rows are arranged so that the first inclination angle is 45[degrees] counterclockwise from the Z direction in the Zθ plane (zx plane), and the plurality of electromagnetic steel sheets 2111 in the other row of two adjacent rows in the plurality of rows are arranged so that the first inclination angle is 45[degrees] clockwise from the Z direction in the Zθ plane (zx plane).

[0031] The second embodiment of the iron cores 211b, 211c are, for example, as shown in Figures 4 and 5, composed of a plurality of stacked electromagnetic steel sheets 2112, 2113, and the stacking surfaces of the stacked electromagnetic steel sheets 2112, 2113 are inclined with respect to the two magnetic flux directions, the Z direction and the R direction.

[0032] More specifically, in one row of the cores 211b in the multiple rows arranged in the rotation axis direction, as shown in Fig. 4, the multiple electromagnetic steel sheets 2112 are each plate-shaped, and the lamination surface is arranged along the tangential direction of the θ direction (x-axis direction), and the normal to the lamination surface is arranged so that the normal to the lamination surface is inclined from the Z direction by a predetermined inclination angle (second inclination angle) in the RZ plane (yz plane) with the line segment (x-axis) along the tangential direction of the θ direction as the rotation axis. In the example shown in Fig. 4, the second inclination angle is 45[degrees] counterclockwise from the Z direction in the RZ plane (yz plane), and therefore the lamination surface is inclined 45[degrees] with respect to the y axis and 45[degrees] with respect to the z axis. In the xyz orthogonal coordinate system, the unit vector representing the normal direction to the lamination surface is (0, 1, -1). The second inclination angle is not limited to this angle, and may be 0[degree]<the second inclination angle<90[degree] in the counterclockwise direction from the Z direction in the RZ plane (yz plane). In the other row of iron cores 211c adjacent to the one row in the rotation axis direction, as shown in FIG. 5, the plurality of electromagnetic steel sheets 2113 are each plate-shaped, and the lamination surface is arranged along the tangential direction of the θ direction (x-axis direction), and the normal to the lamination surface is arranged so that it is inclined by a predetermined inclination angle (third inclination angle) clockwise from the Z direction in the RZ plane (yz plane) with the line segment (x-axis) along the tangential direction of the θ direction as the rotation axis. In the example shown in FIG. 5, the third inclination angle is 45[degree] clockwise from the Z direction in the RZ plane (yz plane), and therefore the lamination surface is inclined 45[degree] with respect to the y axis and 45[degree] with respect to the z axis. In the xyz orthogonal coordinate system, the unit vector representing the normal direction of the stacking plane is (0, 1, 1). Note that the third tilt angle is not limited to this angle, and may be 0[degrees]<the third tilt angle<90[degrees] clockwise in the RZ plane (yz plane).

[0033] In the second embodiment, as shown in Figures 4 and 5, two adjacent rows in the multiple rows are arranged so that the θR plane (xy plane) between the two rows is the symmetric plane, and the magnetic flux in the z-axis direction passes through the tooth portion in its protruding direction.

[0034] In this second mode, the forces act in a well-balanced manner.

[0035] The iron core 211d of the third embodiment is made up of a plurality of stacked electromagnetic steel sheets 2114, for example, as shown in Fig. 6A, and the lamination surfaces of the stacked electromagnetic steel sheets 2114 are inclined with respect to two magnetic flux directions, the θ direction and the Z direction. In the iron core 211d of the third embodiment, the stacked electromagnetic steel sheets 2114 include a plurality of portions whose inclination directions are different, and the plurality of portions are juxtaposed in the circumferential direction. In other words, the iron core 211d of the third embodiment is made up of the stacked electromagnetic steel sheets 2114, and is formed of a plurality of portions including portions whose lamination directions are different, and the plurality of portions are juxtaposed in the circumferential direction. In the example shown in FIG. 6A , each of the multiple electromagnetic steel sheets 2114 is plate-shaped and includes a portion (first portion) in which the stacking surface is arranged along the R direction (y-axis direction) and is arranged so that the normal to the stacking surface is inclined from the Z direction counterclockwise by a predetermined inclination angle (fourth inclination angle) in the Zθ plane (zx plane) with a line segment (y-axis) along the R direction as the axis of rotation, and a portion (second portion) in which the stacking surface is arranged along the R direction (y-axis direction) and is arranged so that the normal to the stacking surface is inclined from the Z direction clockwise by the fourth inclination angle in the Zθ plane (zx plane) with a line segment (y-axis) along the R direction as the axis of rotation. In the example shown in FIG. 6A, the fourth inclination angle of the first portion is 45 degrees counterclockwise from the Z direction in the Zθ plane (zx plane), and the fourth inclination angle of the second portion is 45 degrees clockwise from the Z direction in the Zθ plane (zx plane). Therefore, the cross-sectional shape of the Zθ plane (zx plane) of the electromagnetic steel sheet 2114 is approximately ∧-shaped. The electromagnetic steel sheet of the first portion and the electromagnetic steel sheet of the second portion may be configured separately, but in this embodiment, they are configured as one piece, and this one piece electromagnetic steel sheet is bent at 90 degrees at the center position in the θ direction. The fourth inclination angle may be 0 degrees<the fourth inclination angle<90 degrees. In the iron core (core) 211d of the fourth aspect, for example, as shown in FIG. 6B, in two adjacent rows in the multiple rows, the Rθ plane (xy plane) between the two rows is arranged as a symmetric plane.

[0036] 7A, the iron core 211e of the fourth embodiment is made up of a plurality of stacked electromagnetic steel sheets 2115, and the lamination surfaces of the stacked electromagnetic steel sheets 2115 are inclined with respect to two magnetic flux directions, the θ direction and the Z direction. In the iron core 211e of the fourth embodiment, the stacked electromagnetic steel sheets 2115 include a plurality of portions having different directions of inclination, and the plurality of portions are juxtaposed in the circumferential direction. In other words, the iron core 211e of the fourth embodiment is made up of the stacked electromagnetic steel sheets 2115, and is formed of a plurality of portions including portions having different stacking directions, and the plurality of portions are juxtaposed in the circumferential direction. In the example shown in FIG. 7A , each of the multiple electromagnetic steel sheets 2115 is plate-shaped and includes a portion (third portion) in which the stacking surface is arranged along the R direction (y-axis direction) and is arranged so that the normal to the stacking surface is inclined clockwise from the Z direction by a predetermined inclination angle (fifth inclination angle) in the Zθ plane (zx plane) with a line segment (y-axis) along the R direction as the axis of rotation, and a portion (fourth portion) in which the stacking surface is arranged along the R direction (y-axis direction) and is arranged so that the normal to the stacking surface is inclined counterclockwise from the Z direction by the fifth inclination angle in the Zθ plane (zx plane) with a line segment (y-axis) along the R direction as the axis of rotation. In the example shown in FIG. 7A, the fifth inclination angle of the third portion is 45 degrees clockwise in the Zθ plane (zx plane) from the Z direction, and the fifth inclination angle of the fourth portion is 45 degrees counterclockwise in the Zθ plane (zx plane) from the Z direction, so that the cross-sectional shape of the Zθ plane (zx plane) of the electromagnetic steel sheet 2114 is substantially V-shaped. The electromagnetic steel sheet of the third portion and the electromagnetic steel sheet of the fourth portion may be configured separately, but in this embodiment, they are configured integrally, and this integrally configured electromagnetic steel sheet is bent at 90 degrees at the center position in the θ direction. The fifth inclination angle may be 0 degrees<the fifth inclination angle<90 degrees. In the iron core (core) 211e of the fourth aspect, for example, as shown in FIG. 7B, in two adjacent rows in the multiple rows, the θR plane (xy plane) between the two rows is arranged as a symmetric plane.

[0037] As shown in FIG. 8A, the fifth embodiment of the iron core 211f includes iron cores 211f (211f-12, 211f-14; 211f-22, 211f-24) similar to the iron core 211d of the third embodiment shown in FIG. 6A and iron cores 211f (211f-11, 211f-13, 211f-15; 211f-21, 211f-23, 211f-25) similar to the iron core 211e of the fourth embodiment shown in FIG. 7A, which are arranged alternately in the circumferential direction, and are similarly arranged in two adjacent rows of the multiple rows.

[0038] As shown in FIG. 8B, the sixth embodiment of the core 211g includes cores 211g (211g-11, 211g-13, 211g-15; 211g-22, 211g-24) similar to the core 211d of the third embodiment shown in FIG. 6A and cores 211g (211g-12, 211g-14; 211g-21, 211g-23, 211g-25) similar to the core 211e of the fourth embodiment shown in FIG. 7A, which are arranged alternately in the circumferential direction, and are arranged such that the θR plane (xy plane) between the two adjacent rows in the multiple rows is the symmetric plane.

[0039] In the third to sixth aspects, the number of the plurality of portions is two, but the number may be three or more.

[0040] Electric motor 1000 including any of iron cores 211d to 211g according to the third to sixth embodiments has a plurality of portions with different inclination directions, so that it is easy to balance the magnetic flux distribution within the iron core and bias in the applied electromagnetic force is unlikely to occur.

[0041] 9, the iron core 211h of the seventh embodiment is composed of a plurality of laminated electromagnetic steel sheets 2118, and the lamination surfaces of the laminated electromagnetic steel sheets 2118 are inclined with respect to the three magnetic flux directions of the R direction, the θ direction, and the Z direction. More specifically, the plurality of electromagnetic steel sheets 2118 are each plate-shaped and arranged such that the normal to the lamination surface is inclined from the Z direction by a predetermined inclination angle (8A and 8B inclination angles) in each of two planes formed by two line segments along two of the R direction, the θ direction, and the Z direction. In the example shown in FIG. 9, the 8A tilt angle is 45[degrees] counterclockwise from the Z direction in the Zθ plane (zx plane), and the 8B tilt angle is 45[degrees] clockwise from the Z direction in the RZ plane (yz plane), so that the stacking plane is inclined 45[degrees] with respect to the x-axis direction, inclined 45[degrees] with respect to the y-axis direction, and inclined 45[degrees] with respect to the z-axis direction. In the xyz orthogonal coordinate system, the unit vector representing the normal direction of the stacking plane is (1, 1, 1). The 8A tilt angle may be 0[degrees]<the first tilt angle<90[degrees], and the 8B tilt angle may be 0[degrees]<the first tilt angle<90[degrees].

[0042] In the electric motor 1000 equipped with the iron core 211h of the seventh embodiment, the lamination surface is inclined with respect to three magnetic flux directions, so that the direction of inclination can be dispersed in each direction compared to when the lamination surface is inclined with respect to two magnetic flux directions, thereby reducing bias in the electromagnetic force.

[0043] The iron core (core) 211i of the eighth embodiment is, for example, as shown in Fig. 10, composed of a plurality of laminated electromagnetic steel sheets 2119, and is formed of a plurality of parts including parts with different lamination directions. In the example shown in Fig. 10, the iron core 211i of the ninth embodiment includes a part (fifth part) laminated in a first direction (θ direction in this example) and a part (sixth part) laminated in a second direction (Z direction in this example) different from the first direction, and the fifth and sixth parts are juxtaposed in the Z direction. That is, the fifth part is composed of a plurality of laminated plate-shaped electromagnetic steel sheets 2119-1, and is a part of the iron core 211i having the first direction (θ direction) as the lamination direction, and the sixth part is composed of a plurality of laminated plate-shaped electromagnetic steel sheets 2119-2, and is the remaining part of the iron core 211i having the second direction (Z direction) as the lamination direction. In the xyz Cartesian coordinate system, the unit vector representing the normal direction to the stacking surface in the fifth portion is (1, 0, 0), and the unit vector representing the normal direction to the stacking surface in the sixth portion is (0, 0, 1).

[0044] The ratio of the fifth portion to the sixth portion is approximately proportional to the ratio of the magnet surface area in contact with iron core 211i. In the examples shown in Figures 1, 2 and 10, the surface area of ​​the R magnet is relatively large and the surface area of ​​the Z magnet is relatively small, so the fifth portion is smaller than the sixth portion.

[0045] When a plurality of magnetic pole blocks 21 arranged sequentially in the circumferential direction are arranged in a plurality of rows in the direction of the rotation axis (Z direction), the plurality of electromagnetic steel plates 2119 in the iron core 211i of each row may be arranged in the same manner. However, from the viewpoint of exerting a balanced force, it is preferable that the Rθ plane (xy plane) between two adjacent rows in the plurality of rows is arranged as a symmetric plane.

[0046] In the electric motor 1000 including the iron core 211i of the eighth embodiment, the iron core is formed of a plurality of portions including portions with different lamination directions, so that magnetic flux in each direction can easily pass through.

[0047] The iron cores 211a, (211b, 211c), 211h of the first, second and seventh embodiments can be formed simply by laminating electromagnetic steel sheets, and therefore can be formed more easily than the iron cores 211d to 211g of the third to sixth embodiments.

[0048] As described above, in the electric motor 1000 of the embodiment, the lamination surfaces of the multiple electromagnetic steel sheets are inclined with respect to at least two of the first to third magnetic flux directions, which are three different directions passing through the iron core, so that magnetic flux in the Z direction can enter the iron core, and the characteristics of the three-dimensional magnetic pole structure can be utilized even when electromagnetic steel sheets are used for the iron core.

[0049] 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]

[0050] 1000 electric motor 1 Armature 2 Mover 21 Pole block 211, 211a~211i Iron core 212, 213, 214 Permanent magnets

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 is made of a plurality of laminated electromagnetic steel sheets, lamination surfaces of the laminated electromagnetic steel sheets are inclined with respect to at least two of first to third magnetic flux directions, which are three different directions passing through the iron core; Electric motor.

2. lamination surfaces of the plurality of laminated electromagnetic steel sheets are inclined with respect to the first to third magnetic flux directions; 2. The electric motor according to claim 1.

3. The laminated electromagnetic steel sheets have a plurality of portions in which the inclination directions are different.

2. The electric motor according to claim 1.

4. The plurality of portions are arranged side by side in the circumferential direction.

4. The electric motor according to claim 3.

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 is made of a plurality of laminated electromagnetic steel sheets, and is formed of a plurality of portions including portions having different lamination directions. Electric motor.

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