Structure of stator of rotary machine

Abstract

To provide a structure of a stator of a rotary machine, with which high efficiency can be realized.SOLUTION: A stator 10 comprises: a magnetic material 11 including two surfaces 116 and 117 perpendicular to each other in the axial direction and a radially extending surface 113; insulators 12 and 13 covering the magnetic material 11; and a coil 14 wound up so as to oppose to the radially extending surface 113 of the magnetic material 11. The insulators 12 and 13 include a first insulator 12 and a second insulator 13. The thickness of the first insulator 12 is thinner than that of the second insulator 13. The first insulator 12 covers a circumferentially extending surface 112 of the magnetic material 11, the radially extending surface 113, and the surface 116, which is one of the two surfaces 116 and 117 perpendicular to each other in the axial direction.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to the structure of a stator of a rotating machine, including a generator and an electric motor. [Background technology]

[0002] It has been known that in order to improve the efficiency of a rotating machine, it is necessary to reduce copper loss caused by the resistance component of the winding. On the other hand, it is also known that when attempting to increase the density of the winding to reduce copper loss, there are certain restrictions in order to ensure the insulation distance. For example, Patent Document 1 discloses a stator of an electric motor that includes a laminated core and windings wound concentratedly around the pole teeth of the laminated core, with an insulating sheet interposed between adjacent windings and molded from resin (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-333399 Summary of the Invention [Problem to be solved by the invention]

[0004] In the stator of the electric motor disclosed in Patent Document 1, the insulators arranged on both ends of the laminated core are formed in shapes that are symmetrical to each other with respect to the surfaces facing the laminated core. However, when an insulator having the above-described shape is used, certain restrictions are imposed on the area in the stacking direction of the laminated core where the windings can be wound, which is one example of a problem that certain restrictions are imposed on improving efficiency.

[0005] The present invention has been made in view of the above-mentioned problems, and has an object to provide a stator structure for a rotating machine that can achieve high efficiency. [Means for solving the problem]

[0006] A stator of a rotating machine according to a representative embodiment of the present invention comprises a magnetic body having two surfaces perpendicular to the axial direction and a surface extending radially, an insulator covering the magnetic body, and a coil wound to face the radially extending surface of the magnetic body, wherein the insulator comprises a first insulator and a second insulator, and the thickness of the first insulator is formed thinner than the thickness of the second insulator, and the first insulator covers the circumferentially extending surface of the magnetic body, the radially extending surface, and one of the two surfaces perpendicular to the axial direction. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view showing a structure of a rotating machine according to an embodiment of the present invention; [Figure 2] 1 is a perspective view showing a structure of a rotating machine according to an embodiment of the present invention, with a yoke removed; [Figure 3] 3 is a perspective view showing the structure of the rotating machine of FIG. 2 from a different direction. [Figure 4] 1 is a perspective view showing a structure of a stator assembly of a rotating machine according to an embodiment of the present invention; [Figure 5] FIG. 2 is a perspective view showing the structure of a magnetic body of a stator according to an embodiment of the present invention. [Figure 6] 6 is a perspective view showing the structure of the magnetic body of FIG. 5 from a different direction. [Figure 7] 2 is a perspective view showing the structure of a first insulator of the stator according to the embodiment of the present invention. FIG. [Figure 8] 8 is a perspective view showing the structure of the first insulator of FIG. 7 from a different direction. [Figure 9] FIG. 3 is a perspective view showing the structure of a second insulator of the stator according to the embodiment of the present invention. [Figure 10] 10 is a perspective view showing the structure of the second insulator of FIG. 9 from a different direction. [Figure 11] 1 is a perspective view showing a structure of a circuit board according to an embodiment of the present invention; [Figure 12]3A and 3B are diagrams showing the structure of a coupling region between a magnetic body and a second insulator of a stator according to an embodiment of the present invention. [Figure 13] 3A and 3B are diagrams showing the structure of a coupling region between a magnetic body, a first insulator, and a second insulator of a stator according to an embodiment of the present invention. [Figure 14] 3A and 3B are diagrams showing the structure of a region involved in coupling of a stator with a circuit board according to an embodiment of the present invention; [Figure 15] 15 is a perspective view showing the structure of the region involved in coupling with the circuit board in FIG. 14 from a different direction. DETAILED DESCRIPTION OF THE INVENTION

[0008] First, a summary of a representative embodiment of the invention disclosed in this application will be described. It should be noted that the drawings are schematic, and the dimensional relationships and ratios of elements may differ from the actual situation. The drawings may also include portions where the dimensional relationships and ratios differ from one another.

[0009] [Configuration of rotating machine] FIG. 1 is a perspective view showing the structure of a rotating machine according to an embodiment of the present invention. FIG. 2 is a perspective view showing the structure of the rotating machine according to the embodiment of the present invention, with the yoke removed. FIG. 3 is a perspective view showing the structure of the rotating machine of FIG. 2 from a different direction. FIG. 4 is a perspective view showing the structure of a stator assembly of a rotating machine according to an embodiment of the present invention.

[0010] As shown in Figures 1 to 3, a rotating machine 100 according to an embodiment of the present invention is a rotating machine 100 used as an electric motor or a generator, and includes a rotating shaft 40, a rotor 30 fixed to the rotating shaft 40, a stator 10 positioned on the same axis as the rotor 30, a coil 14, a first bearing 51 and a second bearing 52 that support the rotating shaft 40, a coil spring 60 as an elastic body, and a circuit board 20 as a substrate. The rotating machine 100 as an electric motor can convert electrical energy supplied from the outside into rotational energy and supply the rotational energy to a device connected to the rotating shaft 40. Furthermore, the rotating machine 100 as a generator can convert rotational energy generated in a device connected to the rotating shaft 40 into electrical energy and supply the electrical energy to the outside.

[0011] The rotating shaft 40 is made of, for example, a metal material and has a generally cylindrical shape. The rotating shaft 40 is disposed in a gap inside the stator 10. The first bearing 51 and the second bearing 52 are disposed side by side in the axial direction in the gap inside the stator 10. The first bearing 51 and the second bearing 52 support the rotating shaft 40 rotatably relative to the stator 10.

[0012] The rotor 30 includes a magnet 31, a cup-shaped or approximately cup-shaped yoke 32 that covers the upper side of the stator 10 in the direction of the rotation axis, and a hole (inner peripheral portion) 33 provided in the center of the yoke 32. The magnet 31 surrounds the rotor 30. In other words, the rotating machine 100 is an outer rotor type in which the rotor 30 is provided on the outer peripheral side of the stator 10 in the radial direction. The magnet 31 is formed in a cylindrical or approximately cylindrical shape centered on the center of the hole 33. In addition, in this embodiment of the present invention, the magnet 31 is fixed to the inner peripheral surface of the outer peripheral portion of the yoke 32. The magnet 31 is formed in a cylindrical or approximately cylindrical shape centered on the center of the hole 33. The rotor 30 is fixed to the rotating shaft 40. Specifically, one end of the rotor 30 in the axial direction is attached to the hole 33 of the rotor 30. A coil is provided on the inner peripheral surface of the outer peripheral portion of the yoke 32 instead of the magnet 31. The rotor 30 can be wound around a rotor 10 and generate a main magnetic flux. In this case, when the stator 10 generates the main magnetic flux, it can interact with the main magnetic flux and convert electrical energy into rotational energy and vice versa. In other words, the rotor 30 can function as either an armature or a field magnet, depending on the application.

[0013] The stator 10 is formed by stacking multiple annular plate-shaped magnetic bodies 11, such as electromagnetic steel plates, in an axial direction, which is an example of a predetermined direction. The stator 10 has a generally hollow cylindrical shape and shares the same axis as the rotor 30. As will be described later, the stator 10 also has multiple protruding portions in the radial direction. Coils 14 are wound around the stator 10, which are capable of generating a main magnetic flux. Furthermore, when the rotor 30 generates a main magnetic flux, the coils 14 interact with the main magnetic flux and can convert electrical energy into rotational energy and vice versa. In other words, the stator 10 can function as either an armature or a field magnet, depending on the application.

[0014] The first bearing 51 and the second bearing 52 are press-fitted and fixed to the inner circumferential surface of a hole provided in a base (not shown) that is provided below the rotating machine 100 and supports the rotating machine 100. The first bearing 51 and the second bearing 52 are arranged a predetermined distance apart in the axial direction of the rotating shaft 40 within the hole.

[0015] The first bearing 51 is one of a pair of bearings provided in the rotating machine 100 and is provided on the upper side of the rotating shaft 40. The first bearing 51 is, for example, a ball bearing including an inner ring, an outer ring, and a plurality of rolling elements provided between the inner ring and the outer ring. The inner circumferential surface of the inner ring of the first bearing 51 is attached to the outer circumferential surface of the rotating shaft 40. The outer circumferential surface of the outer ring of the first bearing 51 is attached to the inner circumferential surface of a hole (not shown). In addition to ball bearings, plain bearings can also be used for the first bearing 51 and the second bearing 52. In this case, bearings such as sintered oil-impregnated bearings, gas bearings, and magnetic bearings can be used.

[0016] The second bearing 52 is one of a pair of bearings provided in the rotating machine 100 and is provided below the rotating shaft 40. The second bearing 52 is, for example, a ball bearing that includes an inner ring, an outer ring, and a plurality of rolling elements provided between the inner ring and the outer ring. The inner peripheral surface of the inner ring of the second bearing 52 is attached to the outer peripheral surface of the rotating shaft 40. In addition, the outer peripheral surface of the outer ring of the second bearing 52 is attached to the inner peripheral surface of a hole (not shown).

[0017] As shown in FIG. 4, the stator 10 is integrated with a circuit board 20 to form a stator assembly 1. The circuit board 20 is mounted with electronic components that constitute a control circuit for controlling the driving of the rotating machine 100. In addition to the electronic components, the circuit board 20 may also be mounted with a sensor for measuring the position of the rotor 30.

[0018] [Stator Configuration] As shown in FIG. 4, the stator 10 is formed of a magnetic body 11, a first insulator 12, a second insulator 13, and a coil 14.

[0019] The magnetic body 11 is formed by stacking magnetic materials in the axial direction. The magnetic body 11 has a substantially hollow cylindrical shape and has the same axis as the rotor 30. As will be described later, the magnetic body 11 has a plurality of protruding portions in the radial direction.

[0020] The first insulator 12 is made of, for example, a resin material, and has a shape that covers a partial area of ​​the magnetic body 11. The specific configuration of the first insulator 12 will be described later.

[0021] The second insulator 13 is made of, for example, a resin material, and has a shape that covers a partial area of ​​the magnetic body 11. Specifically, the specific configuration of the second insulator 13 will be described later.

[0022] The coil 14 is made of, for example, a conductive material, and is wound around a central axis in the radial direction around each of a plurality of radially protruding portions (described later) of the magnetic body 11. Specifically, the coil 14 is wound so as to face a surface 113 extending in the radial direction of the magnetic body 11, with the first insulator 12 and the second insulator 13 interposed therebetween.

[0023] [Magnetic material composition] FIG. 5 is a perspective view showing the structure of the magnetic body of the stator according to the embodiment of the present invention. FIG. 6 is a perspective view showing the structure of the magnetic body of FIG. 5 from a different direction.

[0024] As described above, the magnetic body 11 has a substantially hollow cylindrical shape and has the same axis as the rotor 30. The magnetic body 11 also has a plurality of protruding portions in the radial direction. In this embodiment, the magnetic body 11 has a total of six protruding portions spaced at 60-degree intervals in the circumferential direction, but the number of protruding portions is not limited to this and can be changed as desired depending on the application.

[0025] The protruding portion of the magnetic body 11 has a region that extends on both sides in the circumferential direction at the radial tip. That is, when viewed from the axial direction, the magnetic body 11 has a shape that is approximately a hollow cylinder with six approximately T-shaped protruding portions at 60-degree intervals in the circumferential direction on the outer periphery.

[0026] The magnetic body 11 has an inner surface 111, a surface 112 extending in the circumferential direction, a surface 113 extending in the radial direction, a back surface 114 of the outermost surface extending in the circumferential direction, an outermost surface 115 extending in the circumferential direction, a surface that does not face the circuit board 20 (hereinafter also referred to as the "first surface 116 perpendicular to the axial direction"), and a surface that faces the circuit board 20 (hereinafter also referred to as the "second surface 117 perpendicular to the axial direction").

[0027] The inner circumferential surface 111 is a surface that defines a hollow region of the approximately hollow cylinder, and the rotating shaft 40, the first bearing 51, and the second bearing 52 are located inside the inner circumferential surface 111. When viewed in the axial direction, the inner circumferential surface 111 is approximately circular, and has the same axis as the rotor 30. A concave region 111C is provided on the inner circumferential surface 111. Specifically, the concave region 111C is formed so that a portion of the inner circumferential surface 111 is recessed radially outward relative to the surrounding region. When viewed in the axial direction, the concave region 111C has an approximately semicircular shape.

[0028] The surface 112 extending in the circumferential direction is a surface that forms the outer periphery of a substantially hollow cylinder, and is a surface that is located on the opposite side of the inner periphery surface 111 in the radial direction.

[0029] The radially extending surfaces 113 are surfaces located at both circumferential ends of the six protruding portions mentioned above, which are formed so as to protrude radially from the circumferentially extending surface 112.

[0030] The back surface 114 of the outermost circumferentially extending surface is a surface formed to extend approximately perpendicularly to the circumferential direction from the tip of the radially extending surface 113. The back surface 114 of the outermost circumferentially extending surface is located on the radially opposite side of the outermost circumferentially extending surface 115, which will be described later.

[0031] The outermost surface 115 extending in the circumferential direction is the surface located most outside in the radial direction of the magnetic body 11. The outermost surface 115 extending in the circumferential direction is located in a direction approximately 180 degrees opposite in the circumferential direction from the end in the circumferential direction of the back surface 114 of the outermost surface extending in the circumferential direction. The outermost circumferential surface 115 is formed so as to extend to the circumferential end of the back surface 114 of the adjacent outermost circumferential surface. The outermost circumferential surface 115 has a substantially arc shape when viewed from the axial direction, and has the same axis as the rotor 30.

[0032] The first surface 116 perpendicular to the axial direction is formed on a surface perpendicular to the inner peripheral surface 111, the circumferentially extending surface 112, the radially extending surface 113, the back surface 114 of the outermost circumferentially extending surface, and the outermost circumferentially extending surface 115. The first surface 116 perpendicular to the axial direction is located on the opposite side in the axial direction from a second surface 117 perpendicular to the axial direction, which will be described later.

[0033] Second surface 117 perpendicular to the axial direction is formed on a surface perpendicular to inner peripheral surface 111, circumferentially extending surface 112, radially extending surface 113, back surface 114 of the outermost circumferentially extending surface, and outermost circumferentially extending surface 115. Second surface 117 perpendicular to the axial direction is located on the opposite side in the axial direction from first surface 116 perpendicular to the axial direction.

[0034] [Configuration of the first insulator] FIG. 7 is a perspective view showing the structure of a first insulator of a stator according to an embodiment of the present invention. FIG. 8 is a perspective view showing the structure of the first insulator of FIG. 7 from a different direction.

[0035] As described above, the first insulator 12 is formed from a material containing polycarbonate as a resin material, for example, and has a shape that covers a partial region of the magnetic body 11. Specifically, the first insulator 12 has a shape that covers the surface 116 of the magnetic body 11 that does not face the circuit board 20 (first surface 116 perpendicular to the axial direction), the surface 112 extending in the circumferential direction, the surface 113 extending in the radial direction, and the back surface 114 of the outermost surface extending in the circumferential direction. However, the first insulator 12 only needs to be formed thinner than the second insulator 13, and may be formed from other known materials, for example, the resin material, including PBT-GF30.

[0036] The first insulator 12 has a surface 121 covering the circumferentially extending surface 112, a surface 122 covering the radially extending surface 113, a surface 123 covering the back surface 114 of the outermost circumferentially extending surface, and a surface 124 covering the first surface 116 perpendicular to the axial direction.

[0037] The surface 121 that covers the circumferentially extending surface 112 has a shape that covers the circumferentially extending surface 112 of the magnetic body 11. When the shape of the peripheral surface of the surface 121 that covers the circumferentially extending surface 112 is viewed from the axial direction, the surface 121 has a substantially arc shape, and has the same axis as the rotor 30. Furthermore, the diameter of the surface 121 that covers the circumferentially extending surface 112 has substantially the same size as the diameter of the surface 112 that extends in the circumferential direction.

[0038] The surface 122 covering the radially extending surface 113 has a shape that covers the radially extending surface 113 of the magnetic body 11. Specifically, the surface 122 covering the radially extending surface 113 is formed continuously from the surface 121 that covers the circumferentially extending surface 112, and has a shape that covers both circumferential surfaces of the radially extending surfaces 113 located at both circumferential ends of the six protruding portions that are formed so as to protrude radially from the circumferentially extending surface 112. The surface 122 covering the radially extending surface 113 is formed so as to cover a surface 134 of the second insulator 13 that faces the inner surface of the coil 14, as will be described later.

[0039] The surface 123 covering the back surface 114 of the outermost surface extending in the circumferential direction has a shape that covers the back surface 114 of the outermost surface extending in the circumferential direction of the magnetic body 11. Specifically, the surface 123 covering the back surface 114 of the outermost surface extending in the circumferential direction covers the surface 113 extending in the radial direction. The outermost surface 113 extends radially from the outermost surface 122 and has a shape that covers the back surface 114 of the outermost surface 113 extending in the circumferential direction, which is formed so as to extend approximately perpendicularly in the circumferential direction from the tip of the surface 113 extending in the radial direction.

[0040] The surface 124 covering the first surface 116 orthogonal to the axial direction has a shape that covers the first surface 116 orthogonal to the axial direction of the magnetic body 11. Specifically, the surface 124 covering the first surface 116 orthogonal to the axial direction has a shape that covers the inner circumferential surface 111 of the magnetic body 11, the surface 112 extending in the circumferential direction, the surface 113 extending in the radial direction, the back surface 114 of the outermost surface extending in the circumferential direction, and the first surface 116 orthogonal to the axial direction, which is a surface that is orthogonal to the outermost surface 115 extending in the circumferential direction.

[0041] [Configuration of the second insulator] FIG. 9 is a perspective view showing the structure of a second insulator of a stator according to an embodiment of the present invention. FIG. 10 is a perspective view showing the structure of the second insulator of FIG. 9 from a different direction.

[0042] As described above, the second insulator 13 is formed from a known material, for example a resin material including PBT-GF30, and has a shape that covers a partial area of ​​the magnetic body 11. Specifically, as will be described later, the second insulator 13 has a shape that covers the surface 117 of the magnetic body 11 that faces the circuit board 20 (hereinafter also referred to as the "second surface orthogonal to the axial direction").

[0043] The second insulator 13 is made of, for example, a resin material, and has a shape that covers a partial area of ​​the magnetic body 11. Specifically, the second insulator 13 has a shape that covers a surface 117 of the magnetic body 11 that faces the circuit board 20 (a second surface 117 that is perpendicular to the axial direction). The second insulator 13 also has a protrusion 133 that is formed to extend in a direction away from the magnetic body 11 in the axial direction.

[0044] The second insulator 13 has a surface 131 covering the second surface 117 perpendicular to the axial direction, an inner circumferential surface 132, a protrusion 133, and a surface 134 facing the inner circumferential surface of the coil 14.

[0045] The surface 131 covering the second surface 117 orthogonal to the axial direction has a shape that covers the second surface 117 of the magnetic body 11 that is orthogonal to the axial direction. Specifically, the surface 131 covering the second surface 117 orthogonal to the axial direction is a surface that is orthogonal to the inner peripheral surface 111, the surface 112 extending in the circumferential direction, the surface 113 extending in the radial direction, the back surface 114 of the outermost surface extending in the circumferential direction, and the outermost surface 115 extending in the circumferential direction of the magnetic body 11, and has a shape that covers the second surface 117 orthogonal to the axial direction that is located on the opposite side from the first surface 116 orthogonal to the axial direction.

[0046] Inner circumferential surface 132 is a surface that defines a hollow region of the approximately hollow cylinder, and rotor 30 is located inside inner circumferential surface 132. Inner circumferential surface 132 is approximately circular when viewed from the axial direction, and has the same axis as rotor 30. Inner circumferential surface 132 is provided with cutout region 132C and convex region 132P.

[0047] A plurality of cutout regions 132C are formed on the inner circumferential surface 132 in the axial direction so as to recess from the opposite side of the magnetic body 11 toward the side where the magnetic body 11 is located. In the present embodiment, three cutout regions 132C are provided at intervals of 120 degrees in the circumferential direction, but the number is not limited to this and can be changed as desired depending on the application. The cutout region 132C has a shape that engages with a convex region 22P on the inner circumferential surface 22 of the circuit board 20, which will be described later.

[0048] The convex region 132P is formed so as to protrude inward in the radial direction of the inner circumferential surface 132. The convex region 132P has a substantially semicircular shape when viewed in the axial direction. Specifically, the convex region 132P is formed so that a portion of the inner circumferential surface 132 protrudes radially more than the surrounding region.

[0049] The protruding portion 133 is a region surrounded by the back surface 114 of the outermost surface extending in the circumferential direction and the outermost surface 115 extending in the circumferential direction of the surface 131 covering the second surface 117 perpendicular to the axial direction, and is a portion that protrudes toward the opposite side of the magnetic body 11. In other words, the protruding portion 133 is formed so as to extend in a direction away from the magnetic body 11 in the axial direction.

[0050] The surface 134 facing the inner peripheral surface of the coil 14 has a shape that covers the radially extending surface 113 of the magnetic body 11. Furthermore, the surface 134 facing the inner surface of the coil 14 is covered in the circumferential direction by the surface 122 that covers the radially extending surface 113.

[0051] [Circuit board configuration] FIG. 11 is a perspective view showing the structure of a circuit board according to an embodiment of the present invention.

[0052] The circuit board 20 has a substantially hollow disk shape. As described above, the circuit board 20 is mounted with electronic components that constitute a control circuit and the like for controlling the driving of the rotating machine 100. Specifically, the electronic components that constitute the control circuit and the like are mounted on the surface opposite to the surface 21 that faces the second insulator 13. The circuit board 20 has a surface 21 facing the second insulator 13 and an inner peripheral surface 22 .

[0053] The surface 21 facing the second insulator 13 is formed to face the protruding portion 133 of the second insulator 13. In the present embodiment, the surface 21 facing the second insulator 13 and the protruding portion 133 are not in contact with each other, but in order to stabilize the position of the stator 10, the surface 21 facing the second insulator 13 and the protruding portion 133 may be in contact with each other.

[0054] The inner circumferential surface 22 is a surface that defines a hollow portion in the center of the circuit board 20. The inner circumferential surface 132 is provided with a convex region 22P.

[0055] A plurality of convex regions 22P are formed so as to protrude radially inward from the inner circumferential surface 22. Specifically, the convex regions 22P have a shape that protrudes radially more than the surrounding regions in a part of the inner circumferential surface 22. In the present embodiment, three convex regions 22P are provided at intervals of 120 degrees in the circumferential direction, but the number is not limited to this and can be changed as desired depending on the application. As described above, the convex region 22P has a shape that engages with the cutout region 132C.

[0056] [Structure of magnetic materials and insulators] FIG. 12 is a diagram showing the structure of the coupling region between the magnetic body and the second insulator of the stator according to the embodiment of the present invention. FIG. 13 is a diagram showing the structure of a coupling region between the magnetic body, the first insulator, and the second insulator of the stator according to the embodiment of the present invention.

[0057] 12 and 13, for the sake of explanation, the coil 14 is removed from only one of six protruding portions of the magnetic body 11. Also, unlike FIG. 10, FIG. 9 shows a state in which the first insulator 12 is removed for the sake of explanation.

[0058] In FIG. 13, the surface 112 (see FIG. 12) of the magnetic body 11 extending in the circumferential direction is The outermost surface 112 extending in the circumferential direction is covered by a surface 121 that covers the surface 112. Furthermore, the surface 113 (see FIG. 12) extending in the radial direction is covered by a surface 122 that covers the surface 113 extending in the radial direction. Furthermore, the back surface 114 (see FIG. 12) of the outermost surface extending in the circumferential direction is covered by a surface 123 that covers the back surface 114 of the outermost surface extending in the circumferential direction.

[0059] Here, the thickness of the first insulator 12 is formed to be thinner than the thickness of the second insulator 13. In particular, the thickness of a surface 124 of the first insulator 12 facing a surface 116 perpendicular to the axial direction of the magnetic body 11 is formed to be thinner than the thickness of a surface 131 of the second insulator 13 facing the other surface 117 of the surfaces perpendicular to the axial direction of the magnetic body 11. Specifically, as shown in FIG. 13, the thickness t1 of the first insulator 12 is smaller than the thickness t2 of the second insulator 13.

[0060] [Structure of stator and circuit board] FIG. 14 is a diagram showing the structure of a region related to the connection of the stator with the circuit board according to the embodiment of the present invention. FIG. 15 is a perspective view showing the structure of the region involved in bonding with the circuit board in FIG. 14 from a different direction.

[0061] 14 and 15, the second insulator 13 has a cutout region 132C that is recessed in the axial direction relative to the surrounding region in a partial region of the inner circumferential surface 132. Also, as shown in Fig. 8, the circuit board 20 has a protruding region 22P that protrudes radially relative to the surrounding region in a partial region of the inner circumferential surface 22.

[0062] The cutout region 132C and the protruding region 22P have shapes that allow them to engage with each other, and by engaging the cutout region 132C and the protruding region 22P, the second insulator 13 and the circuit board 20 can be engaged with each other, as shown in Figure 4.

[0063] As described above, the stator 10 according to the embodiment of the present invention comprises a magnetic body 11 having two surfaces 116, 117 perpendicular to the axial direction and a surface 113 extending radially, insulators 12, 13 covering the magnetic body 11, and a coil 14 wound to face the radially extending surface 113 of the magnetic body 11, the insulators 12, 13 comprising a first insulator 12 and a second insulator 13, and the thickness of the first insulator 12 is formed thinner than the thickness of the second insulator 13. The first insulator 12 covers the circumferentially extending surface 112 of the magnetic body 11, the radially extending surface 113, and one surface 116 of the two surfaces 116, 117 perpendicular to the axial direction.

[0064] As a result, of the insulators 12 and 13 arranged at both ends of the axial direction of the magnetic body 11, the thickness of the first insulator 12 is formed thinner than the thickness of the second insulator 13, so it is possible to expand the area around which the coil 14 is wound in the direction toward the insulator 12 in the axial direction of the magnetic body 11. Therefore, it is possible to provide a stator structure for the rotating machine 100 that can achieve high efficiency.

[0065] In addition, in the stator 10 according to the embodiment of the present invention, the first insulator 12 has a surface 122 opposite to the radially extending surface 113 and a surface 124 opposite to one of the two surfaces 116, 117 perpendicular to the axial direction, and the second insulator 13 has a surface 131 opposite to the other surface 117 of the two surfaces 116, 117 perpendicular to the axial direction, and the thickness of the surface 124 opposite to the surface 116 perpendicular to the axial direction of the magnetic body 11 in the first insulator 12 is thinner than the thickness of the surface 131 opposite to the other surface 117 of the surfaces perpendicular to the axial direction of the magnetic body 11 in the second insulator 13.

[0066] As a result, the thickness of the surface 124 of the first insulator 12 opposite to the surface 116 perpendicular to the axial direction of the magnetic body 11 is made thinner than the thickness of the surface 131 of the second insulator 13 opposite to the other surface 117 of the surfaces perpendicular to the axial direction of the magnetic body 11, making it possible to further expand the area in which the coil 14 is wound in the direction toward the insulator 12 in the axial direction of the magnetic body 11.

[0067] Furthermore, in the stator 10 according to the embodiment of the present invention, the surface 122 of the first insulator 12 that covers the radially extending surface 113 of the magnetic body 11 further covers the surface 134 of the second insulator 13 that faces the inner surface of the coil 14.

[0068] With this, the surface 134 facing the inner surface of the coil 14 is covered by the first insulator 12, which is formed thinner than the second insulator 13, so that the thickness of the insulators 12 and 13 in the circumferential direction can be reduced. Therefore, it is possible to further expand the area around which the coil 14 is wound in the circumferential direction of the magnetic body 11.

[0069] In addition, in stator 10 according to the embodiment of the present invention, second insulator 13 has protrusion 133 formed so as to extend in a direction away from magnetic body 11 in the axial direction.

[0070] According to this, by providing the second insulator 13 with the protruding portion 133 that faces the circuit board 20, it is possible to prevent the coil 14 from becoming unwound.

[0071] Moreover, the stator 10 according to the embodiment of the present invention further includes a circuit board 20 having a surface 21 facing the second insulator 13 , and the protrusion 133 faces the circuit board 20 .

[0072] According to this, by bringing the second insulator 13 into contact with the circuit board 20, the stator 10 can be easily fixed to the circuit board 20.

[0073] In addition, in stator 10 according to the embodiment of the present invention, magnetic body 11 has, in a partial region of inner circumferential surface 111, concave region 111C that is recessed in the radial direction relative to the surrounding region.

[0074] This allows for positioning of the winding, including preventing rotation of the magnetic body 11, when winding the winding around the magnetic body 11. For example, the winding can be positioned by bringing a jig (not shown) used for winding into contact with the recessed region 111C and the protruding region 132P. However, the winding can also be positioned by bringing the jig (not shown) into contact with the recessed region 111C and the notched region 132C.

[0075] In addition, in stator 10 according to the embodiment of the present invention, second insulator 13 has, in a partial region of inner circumferential surface 132, convex region 132P that protrudes in the radial direction more than the surrounding region.

[0076] This allows for positioning of the winding, including preventing rotation of second insulator 13 and magnetic body 11. For example, the winding can be positioned by bringing the jig into contact with convex region 132P and concave region 111C.

[0077] In addition, in the stator 10 according to the embodiment of the present invention, the second insulator 13 has a cutout region 132C in a partial region of the inner circumferential surface 132 that is recessed in the axial direction relative to the surrounding region, and the circuit board 20 has a partial region of the inner circumferential surface 22 that protrudes in the radial direction relative to the surrounding region. The second insulator 13 and the circuit board 20 are engaged with each other by the notched region 132C and the protruding region 22P.

[0078] According to this, since second insulator 13 has cutout region 132C and circuit board 20 has protruding region 22P, second insulator 13 and circuit board 20 can be engaged with each other without increasing the thickness in the axial direction. Therefore, when engaging stator 10 and circuit board 20, the thickness of stator assembly 1 as a whole in the axial direction can be reduced, and the size of stator assembly 1 as a whole can be reduced. Furthermore, when winding, it is possible to position the winding, including preventing rotation of the second insulator 13 and the magnetic body 11. For example, the winding can be positioned by bringing the jig into contact with the notched region 132C and the recessed region 111C.

[0079] Moreover, the rotating machine 100 according to the embodiment of the present invention includes a rotating shaft 40 , a rotor 30 fixed to the rotating shaft 40 , and a stator 10 positioned coaxially with the rotor 30 .

[0080] This makes it possible to utilize a highly efficient rotating machine 100 equipped with a stator 10 having a first insulator 12 and a second insulator 13 of different thicknesses, in the insulators 12, 13 arranged at both axial ends of the magnetic body 11.

[0081] <<Extension of Embodiment>> The invention made by the inventor has been specifically described above based on an embodiment, but it goes without saying that the invention is not limited thereto and can be modified in various ways without departing from the spirit of the invention.

[0082] For example, in the embodiment of the present invention, the back surface 114 of the outermost surface extending in the circumferential direction of the magnetic body 11 is not covered with an insulator, but may be covered with the first insulator 12 or the second insulator 13. [Explanation of symbols]

[0083] 1... stator assembly, 10... stator, 11... magnetic body, 12... first insulator, 13... second insulator, 14... coil, 20... circuit board, 21... surface of circuit board facing second insulator, 22... inner circumferential surface of circuit board, 22P... convex region on inner circumferential surface of circuit board, 30... rotor, 31... magnet, 32... yoke, 33... hole, 40... rotating shaft, 51... first bearing, 52... second bearing, 60... coil spring, 100... rotating machine, 111... inner circumferential surface of magnetic body, 111C... concave region on inner circumferential surface of magnetic body, 112... circumferentially extending surface of magnetic body, 113... radially extending surface of magnetic body, 114... back surface of outermost circumferentially extending surface of magnetic body, 115... outermost circumferentially extending surface of magnetic body, 116... First surface perpendicular to the axial direction, 117...second surface perpendicular to the axial direction of the magnetic body, 121...surface covering the circumferentially extending surface of the magnetic body in the first insulator, 122...surface covering the radially extending surface of the magnetic body in the first insulator, 123...surface covering the back surface of the outermost circumferentially extending surface of the magnetic body in the first insulator, 124...surface covering the surface perpendicular to the axial direction of the magnetic body in the first insulator, 131...surface covering the surface perpendicular to the axial direction of the magnetic body in the second insulator, 132...inner surface of the second insulator, 132C...cut-out region in the inner surface of the second insulator, 132P...convex region in the inner surface of the second insulator, 133...protrusion of the second insulator, 134...surface facing the inner surface of the coil in the second insulator

Claims

1. a magnetic body having two surfaces perpendicular to the axial direction and a surface extending in the radial direction; an insulator covering the magnetic body; a coil wound around the magnetic body so as to face the surface extending in the radial direction; It is equipped with the insulator includes a first insulator and a second insulator, The thickness of the first insulator is smaller than the thickness of the second insulator. the first insulator covers a circumferentially extending surface of the magnetic body, a radially extending surface, and one of two surfaces orthogonal to the axial direction; stator.

2. 2. The stator according to claim 1, the first insulator has a surface facing the radially extending surface and a surface facing one of two surfaces perpendicular to the axial direction, the second insulator has a surface facing the other of two surfaces perpendicular to the axial direction, a thickness of a surface of the first insulator facing a surface of the magnetic body perpendicular to the axial direction is formed thinner than a thickness of a surface of the second insulator facing the other surface of the surfaces of the magnetic body perpendicular to the axial direction; stator.

3. 3. The stator according to claim 2, a surface of the first insulator that covers the surface of the magnetic body extending in the radial direction further covers a surface of the second insulator that faces an inner surface of the coil; stator.

4. 3. The stator according to claim 2, the second insulator has a protrusion formed to extend in a direction away from the magnetic body in the axial direction; stator.

5. 5. The stator according to claim 4, a circuit board having a surface facing the second insulator, The protrusion faces the circuit board. stator.

6. 4. The stator according to claim 3, the magnetic body has a recessed region in a part of an inner circumferential surface that is recessed in the radial direction relative to a surrounding region, stator.

7. 4. The stator according to claim 3, The first insulator has a convex region in a partial region of an inner circumferential surface that protrudes in the radial direction more than a surrounding region. stator.

8. 6. The stator according to claim 5, the second insulator has a notched region in a partial region of an inner circumferential surface that is recessed in the axial direction more than a surrounding region, the circuit board has a protruding region in a partial region of an inner circumferential surface that protrudes in the radial direction more than a surrounding region, the second insulator and the circuit board engage with each other via the notched region and the protruding region; stator.

9. A rotating machine used as an electric motor or a generator, A rotation axis; a rotor fixed to the rotating shaft; The stator according to any one of claims 1 to 8 is located coaxially with the rotor. Rotating machine.

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