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 Art

[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 rotor. For this purpose, for example, Patent Document 1 discloses an electric motor having a three-dimensional magnetic pole structure. The electric motor disclosed in this Patent Document 1 includes an armature having an armature coil, an iron core disposed opposite to the armature, and a rotor having a plurality of magnetic pole blocks surrounding the iron core by opening the opposing surface to the armature, and in the magnetic pole block, the plurality of permanent magnets are arranged with the same magnetic poles facing the iron core, and each of the plurality of magnetic pole blocks is arranged side by side such that the permanent magnets included therein are adjacent to each other.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Incidentally, in electric motors equipped with a three-dimensional magnetic pole structure, magnetic flux enters the core from three directions: the R direction (radial direction), the θ direction (circumferential direction), and the Z direction (rotation axis direction). Therefore, bulk pure iron or magnetic iron powder is usually used. However, using bulk pure iron for the core generates a large amount of eddy currents. Also, using magnetic iron powder for the core results in low permeability and inferior strength. On the other hand, if electromagnetic steel sheets, which are commonly used for electric motor cores, are arranged in the same way as in general electric motors, with the Z direction being the normal, it becomes difficult to utilize the magnetic flux in the Z direction, and the characteristic of the three-dimensional magnetic pole structure, which allows the use of magnetic flux from three directions, cannot be utilized.

[0005] This invention was made in view of the above circumstances, and its purpose is to provide an electric motor that can utilize 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 studies, the inventors have found that the above objective can be achieved by the present invention as 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 disposed opposite to the armature, and a movable element comprising a plurality of pole blocks each having a plurality of permanent magnets surrounding the iron core so as to open the surface opposite to the armature as a movable element pole, wherein 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 so that the permanent magnets it comprises are adjacent to each other, adjacent pole blocks are connected with one surface of the permanent magnets touching each other, the iron core is made up of a plurality of laminated electromagnetic steel sheets, and the laminated surfaces of the plurality of laminated electromagnetic steel sheets are inclined with respect to at least two of three different first to third magnetic flux directions passing through the iron core.

[0007] Such an electric motor is equipped with a three-dimensional magnetic pole structure, and an electromagnetic steel sheet is used for the core. In this electric motor, the laminated surfaces of the multiple electromagnetic steel sheets are inclined with respect to at least two of the three distinct first to third magnetic flux directions passing through the core, so that magnetic flux in the Z direction can enter the core, and the characteristics of the three-dimensional magnetic pole structure can be utilized even when an electromagnetic steel sheet is used for the core.

[0008] In another embodiment, in the electric motor described above, the laminated surfaces of the multiple laminated electromagnetic steel sheets are inclined with respect to the first to third magnetic flux directions.

[0009] In such an electric motor, since the laminated surface is inclined with respect to three magnetic flux directions, the direction of inclination can be distributed in each direction, compared to the case where the laminated surface is inclined with respect to two magnetic flux directions, thereby reducing the bias of the electromagnetic force.

[0010] In another embodiment, in the electric motor described above, the stacked plurality of electromagnetic steel sheets comprises a plurality of parts with different directions of inclination. Preferably, in the electric motor described above, the electromagnetic steel sheets in each of the plurality of parts are constructed separately. Preferably, in the electric motor described above, the electromagnetic steel sheets in each of the plurality of parts are constructed as a single unit.

[0011] Because such electric motors have multiple sections with different inclination directions, it is easier to balance the magnetic flux distribution within the iron core, and the applied electromagnetic force is less likely to be uneven.

[0012] In another embodiment, the motor described above has the plurality of parts arranged circumferentially. Preferably, in the motor described above, the plurality of parts are formed by bending each of the stacked plurality of electromagnetic steel sheets.

[0013] According to this, an electric motor can be provided in which the aforementioned multiple parts are arranged side by side in the circumferential direction.

[0014] An electric motor according to another aspect of the present invention comprises an armature having an armature coil, a core disposed opposite to the armature, and a movable element comprising a plurality of pole blocks each having a plurality of permanent magnets surrounding the core so as to open the surface opposite to the armature as a movable element pole, wherein the plurality of permanent magnets in the pole blocks are arranged with the same pole facing the core, each of the plurality of pole blocks is arranged so that the permanent magnets in each of them are adjacent to each other, adjacent pole blocks are connected with one surface of the permanent magnets touching each other, and the core is made up of a plurality of laminated electromagnetic steel sheets and is formed of a plurality of parts including parts with different lamination directions. Preferably, in the electric motor described above, the plurality of parts are arranged side by side in the direction of the rotation axis.

[0015] In such electric motors, the core is formed from multiple parts, including parts with different lamination directions, which allows magnetic flux to pass through easily in each direction, and even when using electromagnetic steel sheets for the core, the characteristics of a three-dimensional magnetic pole structure can be utilized. [Effects of the Invention]

[0016] The electric motor according to the present invention can utilize the characteristics of a three-dimensional magnetic pole structure even when using electromagnetic steel sheets for the iron core. [Brief explanation of the drawing]

[0017] [Figure 1] This is a perspective view showing the configuration of the electric motor in the embodiment. [Figure 2] This is a perspective view showing the configuration of the moving element (rotor) in the aforementioned electric motor. [Figure 3] This is a diagram illustrating the configuration of the iron core in the first embodiment. [Figure 4] This is a diagram illustrating the configuration of one row of iron cores in the second embodiment. [Figure 5] This diagram illustrates the configuration of the iron cores of the other row adjacent to the first row in the direction of the rotation axis in the second embodiment. [Figure 6]It is a diagram for explaining the configuration of the iron core in the third aspect. [Figure 7] It is a diagram for explaining the configuration of the iron core in the fourth aspect. [Figure 8] It is a diagram for explaining the configuration of each iron core in the fifth and sixth aspects. [Figure 9] It is a diagram for explaining the configuration of the iron core in the seventh aspect. [Figure 10] It is a diagram for explaining the configuration of the iron core in the eighth aspect.

Mode for Carrying Out the Invention

[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 each figure, components with the same reference numerals indicate the same components, and the description thereof will be omitted as appropriate. In this specification, when referring to generics, reference numerals without subscripts are used, and when referring to individual components, reference numerals with subscripts are used.

[0019] <了 The electric motor (motor) in the embodiment includes an armature having an armature coil, an iron core disposed opposite to the armature, and a plurality of magnetic pole blocks each including a plurality of permanent magnets surrounding the iron core so as to open the opposing surface to the armature as a mover magnetic pole. The plurality of permanent magnets in the magnetic pole block are arranged with the same magnetic pole facing the iron core, and each of the plurality of magnetic pole blocks is arranged side by side such that the permanent magnets included therein are adjacent to each other, and adjacent magnetic pole blocks are connected by contacting one surface of the permanent magnets with each other. Thus, the electric motor in the embodiment has a three-dimensional magnetic pole structure. And in the electric motor in the embodiment, the iron core is composed of a plurality of laminated electromagnetic steel sheets, and the lamination surfaces in the plurality of laminated electromagnetic steel sheets are inclined with respect to at least two of the first to third magnetic flux directions in three different directions passing through the iron core. Hereinafter, such an electric motor will be described more specifically.

[0020] Figure 1 is a perspective view showing the configuration of the electric motor in the embodiment. Figure 2 is a perspective view showing the configuration of the movable element (rotor) in the electric motor. Figure 2A is an overall view, and Figure 2B is a magnified view of a part of the area circled in Figure 2A.

[0021] In this embodiment, the electric motor 1000 comprises, for example, an armature 1 and a movable element 2, as shown in Figures 1 and 2. In this embodiment, it is a radial gap type inner rotor type in which the movable element 2 is rotatably arranged inside the armature 1.

[0022] The armature 1 is a component that comprises multiple armature coils and generates a magnetic field for rotating the movable element 2 using these multiple armature coils. More specifically, in this embodiment, the armature 1 functions as a stator and, for example, as shown in Figure 1, comprises an annular (cylindrical) yoke portion, a plurality of columnar teeth portions arranged at equal intervals in the circumferential direction on the inner surface of the yoke portion and projecting radially inward (towards the center) from the inner surface, and a plurality of coils wound around each of the plurality of teeth portions, which constitute the plurality of armature coils. The yoke portion and the teeth portions are formed integrally or in combination of multiple parts from a soft magnetic material such as soft iron or soft ferrite.

[0023] The movable element 2 comprises multiple magnetic pole blocks 21 that are magnetized, and is a component that moves due to the magnetic interaction between each magnetic field (rotating magnetic field) generated by the armature 1 and each magnetic field generated by the multiple magnetic pole blocks 21. The movable element 2 is fixedly attached to a cylindrical rotating shaft (output shaft) not shown in the figure. More specifically, in this embodiment, the movable element 2 functions as a rotor and comprises, for example, multiple magnetic pole blocks 21 and a back yoke 22, as shown in Figure 2.

[0024] Each of the multiple pole blocks 21 comprises an iron core 211 positioned opposite the armature 1, and a plurality of permanent magnets 212-214 surrounding the iron core 211 so as to open the surface facing the armature 1 as a movable pole. The plurality of permanent magnets 212-214 in the pole block 21 are positioned so that the same magnetic pole is facing the iron core 211, and each of the plurality of pole blocks 21 is arranged so that the permanent magnets 212-214 in each of them are adjacent to each other, and adjacent pole blocks 21 are connected so that one surface of the permanent magnets 212-214 touches each other. Each of the plurality of permanent magnets 212-214 is either rectangular or cubic in shape. Such a magnetic pole block 21 has a configuration in which the magnetic flux is directed as shown by the relatively thick arrow in Figure 2B, increasing the magnetic flux generated in the gap (air gap) between the armature 1 and the movable element 2. For example, such a configuration is disclosed in Japanese Patent No. 6835692 (Japanese Patent Publication No. 2019-75848) and Patent Document 1. The back yoke 22 is an annular (cylindrical) member and, like the yoke portion, is made of a soft magnetic material. The plurality of magnetic pole blocks 21 are arranged sequentially in the circumferential direction on the outer surface of the back yoke 22.

[0025] More specifically, the plurality of magnetic pole blocks 21 arranged sequentially in the circumferential direction are arranged in multiple rows in the direction of the rotation axis, the iron core 211 is roughly hexahedral, and the plurality of 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 the side surface of the iron core 211 along the direction of rotation, 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 direction of rotation 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 direction of rotation is surrounded by the second permanent magnet 213 of other magnetic pole blocks 21 arranged adjacent to the magnetic pole block 21 in the circumferential direction, as the plurality of magnetic pole blocks 21 are arranged sequentially on the outer circumferential surface of the back yoke 22. Therefore, in the example shown in Figure 2, one iron core 211 is surrounded by the first to third permanent magnets 212, 213, and 214 on four surfaces: the bottom surface, two sides along the rotational direction, and the sides between the rows. In the example shown in Figure 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 to this arrangement, and any number of multiple rows may be arranged on the outer circumferential surface of the back yoke 22.

[0026] 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 curvature in the circumferential direction but no curvature in the direction of rotation (infinite radius of curvature), as shown in Figures 2A and 2B. As described above, the iron core 211 is roughly a hexahedron, but in this embodiment, stepped portions are formed at both ends of the iron core 211 in the direction of rotation so that an annular fastener (not shown) that secures the multiple magnetic pole blocks 21 can be fitted into it. In this embodiment, such an iron core 211 is composed of multiple laminated electromagnetic steel sheets, and the laminated surfaces of the multiple laminated electromagnetic steel sheets are inclined with respect to at least two of the three different first to third magnetic flux 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 of the following first to eighth embodiments.

[0028] Figure 3 is a diagram illustrating the configuration of the core in the first embodiment. Figure 4 is a diagram illustrating the configuration of one row of cores in the second embodiment. Figure 5 is a diagram illustrating the configuration of the other row of cores adjacent to the first row in the rotation axis direction in the second embodiment. Figure 6 is a diagram illustrating the configuration of the core in the third embodiment. Figure 6A shows one core, and Figure 6B shows multiple cores arranged in the back yoke 22. Figure 7 is a diagram illustrating the configuration of the core in the fourth embodiment. Figure 7A shows one core, and Figure 7B shows multiple cores arranged in the back yoke 22. Figure 8 is a diagram illustrating the configuration of each core in the fifth and sixth embodiments. Figure 8A shows the core in the fifth embodiment, Figure 8B shows the core in the sixth embodiment, and Figures 8A and 8B show multiple cores arranged in the back yoke 22. Figure 9 is a diagram illustrating the configuration of the core in the seventh embodiment. Figure 10 is a diagram illustrating the configuration of the core in the eighth embodiment. Figure 10A shows multiple cores arranged in the back yoke 22, and Figure 10B shows a single core. Figures 3 to 9 and Figure 10B illustrate the cores 211a to 211i as viewed from the radially outside to the radially inside, as indicated by the relatively thin arrows in Figure 2B. For the sake of explanation, in Figures 3 to 10, as shown in each figure, an xyz Cartesian coordinate system is set up with the line segment along the tangential direction of the outer circumference of the movable element 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 Figures 3 to 10, for the sake of explanation, the stepped portion shown in Figure 2 is omitted.

[0029] The core 211a of the first embodiment is composed of a plurality of laminated electromagnetic steel sheets 2111, as shown in Figure 3, for example, and the laminated surfaces of the plurality of laminated electromagnetic steel sheets 2111 are inclined with respect to two magnetic flux directions, the θ direction and the Z direction. More specifically, each of the plurality of electromagnetic steel sheets 2111 is plate-shaped, and the laminated surfaces are arranged along the R direction (y-axis direction), and the normal to the laminated surfaces is inclined by a predetermined inclination angle (first inclination angle) from the Z direction in the Zθ plane (zx plane) with respect to a line segment (y-axis) along the R direction as the axis of rotation. In the example shown in Figure 3, the first inclination angle is 45 degrees counterclockwise from the Z direction in the Zθ plane (zx plane), and therefore the laminated surfaces are inclined by 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 laminated surfaces is (1, 0, 1). Furthermore, the first inclination angle is not limited to 45 degrees at a 1:1 ratio, but may be 0 degrees < the first inclination angle < 90 degrees, measured counterclockwise from the Z direction within the Zθ plane (zx plane).

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

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

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

[0033] In the second embodiment, as shown in Figures 4 and 5, in the multiple rows, two adjacent rows are arranged such that the θR plane (xy plane) between the two rows is a symmetrical plane, and the magnetic flux in the z-axis direction is arranged to pass through the teeth portion in the direction of its protrusion.

[0034] In this second mode, forces are balanced and act in a harmonious manner.

[0035] The core 211d of the third embodiment is composed of a plurality of laminated electromagnetic steel sheets 2114, as shown in Figure 6A, for example, and the laminated surfaces of the plurality of laminated electromagnetic steel sheets 2114 are inclined with respect to two magnetic flux directions, the θ direction and the Z direction. In this core 211d of the third embodiment, the plurality of laminated electromagnetic steel sheets 2114 comprises a plurality of parts with different directions of inclination, and the plurality of parts are arranged circumferentially. In other words, the core 211d of the third embodiment is composed of a plurality of laminated electromagnetic steel sheets 2114, formed of a plurality of parts including parts with different lamination directions, and the plurality of parts are arranged circumferentially. In the example shown in Figure 6A, each of the plurality of electrical steel sheets 2114 is plate-shaped and comprises a portion (first portion) in which the laminated surface is arranged along the R direction (y-axis direction) and the normal to the laminated surface is inclined counterclockwise by a predetermined inclination angle (fourth inclination angle) in the Zθ plane (zx plane) from the Z direction, with the line segment (y-axis) along the R direction as the axis of rotation, and a portion (second portion) in which the laminated surface is arranged along the R direction (y-axis direction) and the normal to the laminated surface is inclined clockwise by the fourth inclination angle in the Zθ plane (zx plane) from the Z direction, with the line segment (y-axis) along the R direction as the axis of rotation. In the example shown in Figure 6A, the fourth inclination angle of the first portion is 45 degrees counterclockwise in the Zθ plane (zx plane) from the Z direction, and the fourth inclination angle of the second portion is 45 degrees clockwise in the Zθ plane (zx plane) from the Z direction. Therefore, the cross-sectional shape of the Zθ plane (zx plane) of the electrical steel sheet 2114 is approximately V-shaped. The electrical steel sheet of the first portion and the electrical steel sheet of the second portion may be constructed as separate parts, but in this embodiment, they are constructed as a single unit, and this single unit electrical steel sheet is bent at 90 degrees at the central position in the θ direction. The fourth inclination angle may be 0 degrees < fourth inclination angle < 90 degrees. In the iron core 211d of the fourth embodiment, for example, as shown in Figure 6B, two adjacent rows in the multiple rows are arranged such that the Rθ plane (xy plane) between the two rows is a symmetrical plane.

[0036] The core 211e of the fourth embodiment is composed of a plurality of laminated electromagnetic steel sheets 2115, as shown in Figure 7A, for example, and the laminated surfaces of the plurality of laminated electromagnetic steel sheets 2115 are inclined with respect to two magnetic flux directions, the θ direction and the Z direction. In this core 211e of the fourth embodiment, the plurality of laminated electromagnetic steel sheets 2115 comprises a plurality of parts with different directions of inclination, and the plurality of parts are arranged circumferentially. In other words, the core 211e of the fourth embodiment is composed of a plurality of laminated electromagnetic steel sheets 2115, formed of a plurality of parts including parts with different lamination directions, and the plurality of parts are arranged circumferentially. In the example shown in Figure 7A, each of the plurality of electrical steel sheets 2115 is plate-shaped and comprises a portion (third portion) in which the laminated surface is arranged along the R direction (y-axis direction) and the normal to the laminated surface is inclined clockwise by a predetermined inclination angle (fifth inclination angle) from the Z direction in the Zθ plane (zx plane) with respect to a line segment (y-axis) along the R direction as the axis of rotation, and a portion (fourth portion) in which the laminated surface is arranged along the R direction (y-axis direction) and the normal to the laminated surface is inclined counterclockwise by the fifth inclination angle from the Z direction in the Zθ plane (zx plane) with respect to a line segment (y-axis) along the R direction as the axis of rotation. In the example shown in Figure 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. Therefore, the cross-sectional shape of the Zθ plane (zx plane) of the electrical steel sheet 2114 is approximately V-shaped. The electrical steel sheet of the third portion and the electrical steel sheet of the fourth portion may be constructed as separate parts, but in this embodiment, they are constructed as a single unit, and this single unit electrical steel sheet is bent at 90 degrees at the central position in the θ direction. The fifth inclination angle may be 0 degrees < fifth inclination angle < 90 degrees. In the iron core 211e of the fourth embodiment, for example, as shown in Figure 7B, two adjacent rows in the multiple rows are arranged such that the θR plane (xy plane) between the two rows is a symmetrical plane.

[0037] The fifth embodiment of the core 211f is provided with, for example, as shown in Figure 8A, cores 211f (211f-12, 211f-14; 211f-22, 211f-24) similar to the core 211d of the third embodiment shown in Figure 6A (211f-11, 211f-13, 211f-15; 211f-21, 211f-23, 211f-25) similar to the core 211e of the fourth embodiment shown in Figure 7A, arranged alternately in the circumferential direction, and similarly arranged in two adjacent rows in the multiple rows.

[0038] The sixth embodiment of the core 211g is provided, for example as shown in Figure 8B, with cores 211g (211g-11, 211g-13, 211g-15; 211g-22, 211g-24) similar to the third embodiment of the core 211d shown in Figure 6A, and cores 211g (211g-12, 211g-14; 211g-21, 211g-23, 211g-25) similar to the fourth embodiment of the core 211e shown in Figure 7A, arranged alternately in the circumferential direction, and in two adjacent rows of the multiple rows, the θR plane (xy plane) between the two rows is arranged to be a symmetrical plane.

[0039] In addition, in the third to sixth embodiments, the aforementioned plurality of parts were two, but there may be three or more.

[0040] The electric motor 1000, equipped with any of the iron cores 211d to 211g of the third to sixth embodiments, has multiple parts with different directions of inclination, making it easier to balance the magnetic flux distribution within the iron core and less likely to cause bias in the applied electromagnetic force.

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

[0042] In the seventh embodiment, the electric motor 1000 equipped with the iron core 211h has a laminated surface that is inclined with respect to three magnetic flux directions. Compared to the case where the laminated surface is inclined with respect to two magnetic flux directions, the direction of inclination can be distributed in each direction, thereby reducing the bias of the electromagnetic force.

[0043] The core 211i of the eighth embodiment is composed of multiple laminated electromagnetic steel sheets 2119, as shown in Figure 10, for example, and is formed of multiple parts including parts with different lamination directions. In the example shown in Figure 10, the core 211i of the ninth embodiment comprises a part (fifth part) laminated in a first direction (θ direction in this example) and a part (sixth part) laminated in a second direction different from the first direction (Z direction in this example), and the fifth and sixth parts are arranged side by side in the Z direction. That is, the fifth part is composed of multiple laminated plate-shaped electromagnetic steel sheets 2119-1 and is a part of the core 211i with the first direction (θ direction) as the lamination direction, and the sixth part is composed of multiple laminated plate-shaped electromagnetic steel sheets 2119-2 and is the remaining part of the core 211i with the second direction (Z direction) as the lamination direction. In the aforementioned xyz orthogonal coordinate system, the unit vector representing the normal direction of the laminated surface in the fifth part is (1, 0, 0), and the unit vector representing the normal direction of the laminated surface in the sixth part is (0, 0, 1).

[0044] The ratio of the fifth portion to the sixth portion is approximately proportional to the ratio of the surface area of ​​the magnet in contact with the 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 the multiple magnetic pole blocks 21 arranged sequentially in the circumferential direction are arranged in multiple rows in the rotation axis direction (Z direction), the multiple electromagnetic steel sheets 2119 in the iron core 211i of each row may be arranged similarly, but from the viewpoint of applying force in a balanced manner, it is preferable that in two adjacent rows in the multiple rows, the Rθ plane (xy plane) between the two rows be symmetrical.

[0046] In the eighth embodiment, the electric motor 1000 equipped with the iron core 211i has an iron core formed of multiple parts including parts with different stacking directions, which makes it easier to pass magnetic flux in each direction.

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

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

[0049] To illustrate the present invention, the embodiments have been adequately and fully described above with reference to the drawings. However, those skilled in the art should recognize that it is easy to modify and / or improve upon the embodiments described above. Therefore, unless such modifications or improvements implemented by those skilled in the art fall outside the scope of the claims, such modifications or improvements shall be considered to be included within the scope of the claims. [Explanation of Symbols]

[0050] 1000 electric motor 1. Armature 2 Mover 21 Magnetic pole block 211, 211a~211i Iron core 212, 213, 214 Permanent Magnets

Claims

1. The device comprises an armature having an armature coil, a core positioned opposite the armature, and a movable element having a plurality of magnetic pole blocks each containing a plurality of permanent magnets that surround the core so as to open the surface opposite the armature as a movable magnetic pole. The plurality of permanent magnets in the magnetic pole block are arranged so that the same magnetic pole is directed towards the iron core in each of the three different first to third magnetic flux directions passing through the iron core. Each of the aforementioned plurality of magnetic pole blocks is arranged so that the permanent magnets it possesses are adjacent to each other, and the permanent magnets placed between adjacent magnetic pole blocks are shared by the adjacent magnetic pole blocks. The aforementioned iron core is composed of multiple laminated electrical steel sheets, The laminated surfaces of the aforementioned stacked electromagnetic steel sheets are inclined with respect to at least two of the three distinct first to third magnetic flux directions passing through the iron core. Electric motor.

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

3. The stacked plurality of electrical steel sheets comprises a plurality of portions with different directions of inclination. The electric motor according to claim 1.

4. The aforementioned multiple parts are arranged circumferentially. The electric motor according to claim 3.

5. The device comprises an armature having an armature coil, a core positioned opposite the armature, and a movable element having a plurality of magnetic pole blocks each containing a plurality of permanent magnets that surround the core so as to open the surface opposite the armature as a movable magnetic pole. The plurality of permanent magnets in the magnetic pole block are arranged so that the same magnetic pole is directed towards the iron core in each of the three different first to third magnetic flux directions passing through the iron core. Each of the aforementioned plurality of magnetic pole blocks is arranged so that the permanent magnets it possesses are adjacent to each other, and the permanent magnets placed between adjacent magnetic pole blocks are shared by the adjacent magnetic pole blocks. The iron core is composed of multiple laminated electrical steel sheets and is formed of multiple parts including parts with different lamination directions. Electric motor.

Images