Stator and motor

Abstract

A stator 20A comprises: a stator core 30A that is constituted by a magnetic powder molded body, and that includes an annular yoke 31 which extends in a circumferential direction, and teeth 32 which project from an inner circumferential surface of the yoke 31 in a radial direction of the yoke 31; a coil 40A that is constituted by a winding 41 which is wound around the teeth 32; and a terminal plate 50A that is provided on an outer circumferential surface 31a of the yoke 31 in the radial direction. The terminal plate 50A includes: a plate section 51; and a terminal section 52a that is fixed to the plate section 51. The plate section 51 includes: a first surface 51a that is positioned on the outer circumferential surface 31a side of the yoke 31, in the axial direction; and a second surface 51b that is positioned on the opposite side to the outer circumferential surface 31a of the yoke 31. The terminal section 52a projects from at least the second surface 51b of the plate section 51, and one end section 41a of the winding 41 is fixed under conditions of being tied to the terminal section 52a.

Description

Technical Field

[0001] The present invention relates to a stator and a motor.

Background Art

[0002] Patent Document 1 discloses an electric motor including a rotor having a plurality of circumferentially spaced magnetic poles and a stator surrounding the rotor. The stator includes an annular stator core formed by molding magnetic powder. The stator core has an annular yoke and a plurality of teeth protruding from the inner circumference of the yoke and spaced apart from each other with slots in the circumferential direction of the yoke. Grooves for winding coils are provided at both axial ends of the stator core corresponding to each tooth.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the electric motor described in Patent Document 1, a bus bar is used to electrically lead out the coil. As shown in FIG. 4 of Patent Document 1, the bus bar to which the coil is connected is fixed to the stator core by screwing. However, in the electric motor described in Patent Document 1, since the bus bar for electrically leading out the coil is provided above the stator core, the electric motor tends to be thick. Thus, there is room for improvement in the electric motor described in Patent Document 1 in terms of realizing electrical lead-out of the coil while suppressing an increase in thickness.

[0005] The present invention was made to solve the above problems and aims to provide a stator that can achieve electrical derivation of the coil while suppressing an increase in thickness. The present invention also aims to provide a motor having the above stator. [Means for solving the problem]

[0006] The stator of the present invention comprises a stator core made of a molded body of magnetic powder, having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, a coil made of windings wound around the teeth, and a terminal plate provided on the outer circumferential surface of the yoke in the radial direction, wherein the terminal plate has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first surface located on the outer circumferential surface side of the yoke in the radial direction and a second surface located on the opposite side of the outer circumferential surface of the yoke, the terminal portion protruding from at least the second surface of the plate portion, and one end of the windings is fixed in a state of being wrapped around the terminal portion.

[0007] The motor of the present invention is characterized by comprising a stator of the present invention and a rotor provided opposite to the inner circumferential surface of the stator. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a stator that enables electrical derivation of the coil while suppressing an increase in thickness. Furthermore, according to the present invention, it is possible to provide a motor having the above-mentioned stator. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a schematic perspective view showing an example of a stator according to Embodiment 1 of the present invention. [Figure 2] Figure 2 is a schematic perspective view showing the coil unit in Figure 1 as seen from the inside in the radial direction. [Figure 3]Figure 3 is a schematic perspective view showing the coil unit in Figure 1 as seen from the radial outside. [Figure 4] Figure 4 is a schematic perspective view showing the divided core in Figure 2. [Figure 5] Figure 5 is a schematic perspective view showing the disassembled state of the split core and terminal board in Figure 3. [Figure 6] Figure 6 is a schematic perspective view showing the terminal board in Figure 5 as seen from the inside in the radial direction. [Figure 7] Figure 7 is a schematic perspective view showing a coil unit that constitutes an example of a stator in a modified embodiment of the present invention. [Figure 8] Figure 8 is a schematic perspective view showing the disassembled state of the split core and terminal board in Figure 7. [Figure 9] Figure 9 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 2 of the present invention. [Figure 10] Figure 10 is a schematic perspective view showing the disassembled state of the split core and terminal board in Figure 9. [Figure 11] Figure 11 is a schematic cross-sectional diagram showing an example of a cross-section along line segment a1-a2 of the coil unit (excluding the windings) shown in Figure 9. [Figure 12] Figure 12 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 3 of the present invention. [Figure 13] Figure 13 is a schematic perspective view showing the disassembled state of the split core and terminal board in Figure 12. [Figure 14] Figure 14 is a schematic perspective view showing the terminal board in Figure 13 as viewed from the radially inner side. [Figure 15] Figure 15 is a schematic perspective view showing a coil unit that constitutes an example of a stator in a modified embodiment 3 of the present invention. [Figure 16] Figure 16 is a schematic perspective view showing the disassembled state of the split core and terminal board in Figure 15. [Figure 17] Figure 17 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 4 of the present invention. [Figure 18] Figure 18 is a perspective schematic view showing a state in which the split core and the terminal board in Figure 17 are disassembled. [Figure 19] Figure 19 is a perspective schematic view showing a coil unit constituting an example of a stator according to Embodiment 5 of the present invention. [Figure 20] Figure 20 is a perspective schematic view showing a state in which the split core and the terminal board in Figure 19 are disassembled. [Figure 21] Figure 21 is a perspective schematic view showing a coil unit constituting an example of a stator according to Embodiment 6 of the present invention. [Figure 22] Figure 22 is a perspective schematic view showing a state in which the split core and the terminal board in Figure 21 are disassembled. [Figure 23] Figure 23 is a cross-sectional schematic view showing an example of a cross-section along line segment b1 - b2 of the coil unit (excluding windings) shown in Figure 21. [Figure 24] Figure 24 is a perspective schematic view showing a coil unit constituting an example of a stator according to Embodiment 7 of the present invention. [Figure 25] Figure 25 is a perspective schematic view showing a state in which the split core and the terminal board in Figure 24 are disassembled. [Figure 26] Figure 26 is a cross-sectional schematic view showing an example of a cross-section along line segment c1 - c2 of the coil unit (excluding windings) shown in Figure 24. [Figure 27] Figure 27 is a perspective schematic view showing a coil unit constituting an example of a stator according to Embodiment 8 of the present invention. [Figure 28] Figure 28 is a perspective schematic view showing a state in which the split core and the terminal board in Figure 27 are disassembled. [Figure 29] Figure 29 is a cross-sectional schematic view showing an example of a cross-section along line segment d1 - d2 of the coil unit (excluding windings) shown in Figure 27. [Figure 30] Figure 30 is a perspective schematic view showing an example of a stator according to Embodiment 9 of the present invention. [Figure 31] Figure 31 is a perspective schematic view showing the coil unit in Figure 30. [Figure 32]Figure 32 is a schematic perspective view showing an example of a motor according to Embodiment 10 of the present invention. [Figure 33] Figure 33 is a schematic perspective view showing an example of a motor according to Embodiment 11 of the present invention. [Modes for carrying out the invention]

[0010] The stator and motor of the present invention will be described below. However, the present invention is not limited to the following configurations and may be modified as appropriate without departing from the spirit of the invention. Furthermore, a combination of several of the preferred configurations described below also constitutes the present invention.

[0011] The embodiments described below are illustrative, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. In Embodiment 2 and subsequent embodiments, descriptions of matters common to Embodiment 1 will be omitted, and the differences will be described primarily. In particular, similar effects and benefits due to similar configurations will not be mentioned sequentially for each embodiment.

[0012] In the following description, unless otherwise specified, each embodiment will simply be referred to as "the stator of the present invention" and "the motor of the present invention."

[0013] The drawings shown below are schematic representations, and their dimensions, aspect ratios, and scales may differ from those of the actual product.

[0014] In this specification, terms describing relationships between elements (e.g., "parallel," "orthogonal," etc.) and terms describing the shapes of elements mean not only their literal, exact forms, but also a range that is substantially equivalent, for example, a range that includes differences of a few percent.

[0015] [Stata] The stator of the present invention comprises a stator core made of a molded body of magnetic powder, having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, a coil made of windings wound around the teeth, and a terminal plate provided on the outer circumferential surface of the yoke in the radial direction, wherein the terminal plate has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first surface located on the outer circumferential surface side of the yoke in the radial direction and a second surface located on the opposite side of the outer circumferential surface of the yoke, the terminal portion protruding from at least the second surface of the plate portion, and one end of the windings is fixed in a state of being wrapped around the terminal portion.

[0016] <Embodiment 1> In the stator of the present invention, the outer circumferential surface of the yoke and the first surface of the plate portion may be mated together at an outer circumferential surface mating portion. In this case, the outer circumferential surface mating portion in the stator of the present invention may consist of a convex portion protruding from one of the outer circumferential surface of the yoke and the first surface of the plate portion, and a concave portion recessed from the other of the outer circumferential surface of the yoke and the first surface of the plate portion, which are mated together. A stator of this form will be described below as the stator of Embodiment 1 of the present invention.

[0017] Figure 1 is a schematic perspective view showing an example of a stator according to Embodiment 1 of the present invention.

[0018] The stator 20A shown in Figure 1 has a stator core 30A, a plurality of coils 40A, and a plurality of terminal boards 50A.

[0019] The stator core 30A has a yoke (also called a core back) 31 and a plurality of teeth 32.

[0020] In this specification, the direction in which the axis of the stator core extends is defined as the axial direction. The direction along the outer surface of the yoke when viewed from the axial direction is defined as the circumferential direction. Furthermore, the direction perpendicular to the axial direction and in which the outer and inner surfaces of the yoke are opposite each other is defined as the radial direction.

[0021] The yoke 31 is an annular shape that follows the circumferential direction.

[0022] The multiple teeth 32 each independently protrude radially from the inner circumferential surface of the yoke 31, spaced apart from one another in the circumferential direction. In this way, the multiple teeth 32 are integrated with the yoke 31.

[0023] The stator core 30A is made of a molded magnetic powder. In other words, the yoke 31 and teeth 32 of the stator core 30A are integrally formed from a molded magnetic powder.

[0024] In the stator of the present invention, it is preferable that the stator core is made of a compacted magnetic core.

[0025] In the stator 20A, the stator core 30A is preferably made of a compacted magnetic core. In other words, the yoke 31 and teeth 32 of the stator core 30A are preferably made of a compacted magnetic core integrated into one unit.

[0026] The stator core 30A may be made of a molded body of a composite material containing magnetic powder and resin, rather than a compacted magnetic core.

[0027] Each of the multiple coils 40A consists of a winding 41 wound around a tooth 32. The multiple coils 40A are provided independently on the tooth 32 so as to be spaced apart from each other in the circumferential direction.

[0028] Each of the multiple coils 40A is insulated from the teeth 32, for example, via an insulating material described later.

[0029] Multiple coils 40A, for example in the case of a three-phase system, include a coil composed of a U-phase winding, a coil composed of a V-phase winding, and a coil composed of a W-phase winding. In this case, the U-phase winding, the V-phase winding, and the W-phase winding are connected in a star or delta configuration.

[0030] Examples of winding wire 41 include polyurethane copper wire (UEW).

[0031] Each of the multiple terminal boards 50A is provided on the outer circumferential surface 31a of the yoke 31 in the radial direction.

[0032] In the stator 20A, since the terminal plate 50A is provided on the outer peripheral surface 31a of the yoke 31, even when the terminal plate 50A is provided, the increase in the thickness of the stator 20A, or more specifically, the increase in the axial dimension of the stator 20A, is suppressed.

[0033] The terminal board 50A has a board portion 51, a terminal portion 52a, and a terminal portion 52b.

[0034] The plate portion 51 has, in the radial direction, a first surface 51a located on the side of the outer circumferential surface 31a of the yoke 31, and a second surface 51b located on the opposite side of the outer circumferential surface 31a of the yoke 31.

[0035] The plate portion 51 is preferably made of an insulating material.

[0036] Examples of insulating materials that constitute the plate portion 51 include resins such as polyphenylene sulfide (PPS).

[0037] Terminals 52a and 52b are fixed to the plate portion 51.

[0038] The terminal portions 52a and 52b protrude from at least the second surface 51b of the plate portion 51.

[0039] Preferably, the direction in which terminal portions 52a and 52b extend is perpendicular to the axial direction. In this case, the direction in which terminal portions 52a and 52b extend may be radial, or it may be in a direction different from the radial direction.

[0040] Terminal portions 52a and 52b are spaced apart from each other in the circumferential direction.

[0041] In the stator of the present invention, the terminal portion is preferably made of a conductive material.

[0042] In the stator 20A, it is preferable that the terminal portions 52a and 52b are made of a conductive material. In this case, one end 41a of the winding 41 and the terminal of the connection board described later can be easily connected via the terminal portion 52a. Also, the other end 41b of the winding 41 and the terminal of the connection board described later can be easily connected via the terminal portion 52b.

[0043] Examples of conductive materials that constitute terminal portions 52a and 52b include metals such as phosphor bronze.

[0044] The terminal portions 52a and 52b may be made of an insulating material. In this case, since there is no need to consider insulation between the terminal portion 52a and the stator core 30A, and furthermore, between the terminal portion 52b and the stator core 30A, the terminal portions 52a and 52b can be easily fixed to the plate portion 51. In addition, the terminal plate 50A can be easily manufactured by integrally molding the terminal portions 52a and 52b with the plate portion 51.

[0045] Examples of insulating materials that constitute terminal portions 52a and 52b include resins such as polyphenylene sulfide.

[0046] The constituent materials of terminal portion 52a and terminal portion 52b are preferably the same, but they may be different.

[0047] Examples of the three-dimensional shapes of terminal portions 52a and 52b include cylindrical and prismatic shapes.

[0048] The three-dimensional shapes of terminal portions 52a and 52b are preferably the same, but they may be different.

[0049] As described above, the terminal plate 50A is provided on the outer circumferential surface 31a of the yoke 31. In other words, the terminal plate 50A is provided on the outer circumferential surface 31a of the yoke 31 such that the first surface 51a of the plate portion 51 faces the outer circumferential surface 31a of the yoke 31.

[0050] It is preferable that the terminal plate 50A is provided on the outer circumferential surface 31a of the yoke 31 via an insulating member (not shown). In other words, it is preferable that an insulating member is interposed between the outer circumferential surface 31a of the yoke 31 and the first surface 51a of the plate portion 51. In this case, insulation between the yoke 31 and the terminal plate 50A, in particular insulation between the yoke 31 and the terminal portion 52a, and insulation between the yoke 31 and the terminal portion 52b, is ensured.

[0051] The insulating member may be an insulating film that covers at least one of the outer circumferential surface 31a of the yoke 31 and the first surface 51a of the plate portion 51. In this case, the outer circumferential surface 31a of the yoke 31 may be covered with the insulating film, or the first surface 51a of the plate portion 51 may be covered with the insulating film, or both the outer circumferential surface 31a of the yoke 31 and the first surface 51a of the plate portion 51 may be covered with the insulating film.

[0052] If the outer circumferential surface 31a of the yoke 31 is covered with an insulating film, it is preferable that the entire surface of the stator core 30A is covered with an insulating film. However, if the outer circumferential surface 31a of the yoke 31 is covered with an insulating film, the entire surface of the stator core 30A does not need to be covered with an insulating film.

[0053] When the first surface 51a of the plate portion 51 is covered with an insulating film, it is preferable that the entire surface of the plate portion 51 is covered with the insulating film. However, when the first surface 51a of the plate portion 51 is covered with an insulating film, the entire surface of the plate portion 51 does not need to be covered with the insulating film.

[0054] As a method for covering target surfaces such as the outer peripheral surface 31a of the yoke 31 and the first surface 51a of the plate portion 51 with an insulating film, for example, a method of coating the target surface with an insulating material by a coating method such as electrodeposition coating.

[0055] The insulating member may be an insulating sheet pre-formed from an insulating material. In this case, the insulating sheet is at least placed between the outer peripheral surface 31a of the yoke 31 and the first surface 51a of the plate portion 51.

[0056] As described above, if the plate portion 51 is made of an insulating material, the first surface 51a of the plate portion 51 does not need to be covered with an insulating film. However, for example, if the terminal portions 52a and 52b are exposed from the first surface 51a of the plate portion 51, as will be described later, it is preferable that the exposed portions of the terminal portions 52a and 52b that are exposed from the first surface 51a of the plate portion 51 are covered with an insulating film.

[0057] One end 41a of the winding 41 is fixed in place, wrapped around the terminal portion 52a. This allows one end 41a of the winding 41 to be led out to the terminal board 50A.

[0058] One end 41a of the winding 41 may be wrapped around the terminal portion 52a and then fixed to the terminal portion 52a by soldering or the like. Alternatively, one end 41a of the winding 41 may be wrapped around the terminal portion 52a and then fixed to the terminal portion 52a and the terminal of the wiring board described later by soldering or the like.

[0059] Preferably, the other end 41b of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52b. In this case, the other end 41b of the winding 41 is led out to the terminal board 50A.

[0060] The other end 41b of the winding 41 may be wrapped around the terminal portion 52b and then fixed to the terminal portion 52b by soldering or the like. Alternatively, the other end 41b of the winding 41 may be wrapped around the terminal portion 52b and then fixed to the terminal portion 52b and the terminal of the wiring board described later by soldering or the like.

[0061] In the stator 20A, there is only one coil 40A in which one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, and it is preferable that for all coils 40A, one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a.

[0062] In the stator 20A, as shown in Figure 1, it is particularly preferable that for all coils 40A, one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, and the other end 41b of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52b.

[0063] In addition, in the stator 20A, as long as there is at least one coil 40A in which one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, there may be coils 40A in which one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, but the other end 41b of the winding 41 is not fixed in a state where it is wrapped around the terminal portion 52b, or there may be coils 40A in which both ends of the winding 41 are not fixed in a state where they are wrapped around the terminal portion.

[0064] As described above, in the stator 20A, by utilizing the terminal plate 50A provided on the outer peripheral surface 31a of the yoke 31, electrical derivation of the coil 40A, for example, electrical derivation of the coil 40A for electrical connection to the wiring board described later, is realized.

[0065] Furthermore, in the stator 20A, since the terminal plate 50A is provided on the outer circumferential surface 31a of the yoke 31, even when the terminal plate 50A is provided, the increase in the thickness of the stator 20A, or more specifically, the increase in the axial dimension of the stator 20A, is suppressed.

[0066] Therefore, with stator 20A, it is possible to achieve electrical derivation of coil 40A while suppressing an increase in thickness.

[0067] During the manufacturing of the stator 20A, as described later, there is no need to perform additional processing on the molded stator core 30A in order to mount the terminal plate 50A on the outer surface 31a of the yoke 31. Therefore, a decrease in the manufacturing efficiency of the stator 20A is suppressed.

[0068] During the manufacturing of the stator 20A, as described later, there is no need to perform additional processing on the molded stator core 30A in order to mount the terminal plate 50A on the outer surface 31a of the yoke 31. Therefore, the stator core 30A is not damaged during the manufacturing of the stator 20A, and as a result, the reduction in the strength of the stator 20A (more specifically, the stator core 30A) is suppressed.

[0069] Furthermore, in the stator 20A, since the terminal plate 50A is mounted on the outer surface 31a of the yoke 31, the presence of the terminal plate 50A does not reduce the space factor of the coil 40A (winding 41). This ensures the power density of the motor into which the stator 20A is incorporated.

[0070] In the stator of the present invention, it is preferable that the terminal plate is provided along the boundary between the outer circumferential surface of the yoke and the end face of the yoke in the axial direction of the stator core.

[0071] In the stator 20A, it is preferable that the terminal plate 50A is provided along the boundary between the outer circumferential surface 31a of the yoke 31 and the end face 31b of the yoke 31 in the axial direction of the stator core 30A. In this case, the terminal portions 52a and 52b are closer to the main body of the coil 40A, making it easier to electrically lead out the coil 40A.

[0072] In the following, as an example of the stator of the present invention, a stator in which a plurality of coil units are arranged in a ring in the circumferential direction will be given, and the manner in which the terminal plate is installed on the outer surface of the yoke in each coil unit will be described.

[0073] The stator of the present invention may have a plurality of coil units arranged in an annular shape in the circumferential direction, and each of the plurality of coil units may independently have a divided core formed by dividing the stator core in the circumferential direction, a coil, and a terminal plate.

[0074] The stator 20A shown in Figure 1 consists of multiple coil units 70A arranged in a ring shape in the circumferential direction.

[0075] Figure 2 is a schematic perspective view showing the coil unit in Figure 1 viewed from the inside in the radial direction. Figure 3 is a schematic perspective view showing the coil unit in Figure 1 viewed from the outside in the radial direction. Figure 4 is a schematic perspective view showing the divided core in Figure 2. Figure 5 is a schematic perspective view showing the divided core and terminal board in Figure 3 in a disassembled state. Figure 6 is a schematic perspective view showing the terminal board in Figure 5 viewed from the inside in the radial direction. Note that in Figure 5, the coil is not shown in order to make the structure of the divided core and terminal board easier to understand. For the same reason, the coil is not shown in the subsequent drawings showing the divided core and terminal board in a disassembled state.

[0076] The coil unit 70A shown in Figures 2 and 3 comprises a split core 80A, a coil 40A, and a terminal board 50A.

[0077] The divided core 80A is formed by dividing the stator core 30A in the circumferential direction. In other words, the stator core 30A is made up of multiple divided cores 80A arranged in a ring in the circumferential direction.

[0078] The divided core 80A has a divided yoke 81 and teeth 32.

[0079] The divided yoke 81 is formed by dividing the yoke 31 in the circumferential direction.

[0080] The teeth 32 protrude radially from the inner circumferential surface of the segmented yoke 81. In this way, the teeth 32 are integrated with the segmented yoke 81.

[0081] The segmented core 80A is made of a molded magnetic powder. In other words, the segmented yoke 81 and teeth 32 of the segmented core 80A are integrally formed from a molded magnetic powder.

[0082] When viewed from the axial direction, the outer circumference of the segmented core 80A along the circumferential direction, that is, the outer circumference of the segmented yoke 81 along the circumferential direction, may be, for example, curved, straight, or a combination of curved and straight shapes. The configuration in which segmented yokes 81 having the shapes described above when viewed from the axial direction are arranged in the circumferential direction is included in the configuration in which the yoke 31 is annular along the circumferential direction.

[0083] In the divided core 80A, it is preferable that the teeth 32 are thinner on the side of the divided yoke 81 than on the side opposite to the divided yoke 81 in at least one direction, either axially or circumferentially. In the example shown in Figure 4, the teeth 32 are thinner on the side of the divided yoke 81 than on the side opposite to the divided yoke 81 in the circumferential direction.

[0084] In other words, in a stator core 30A in which multiple segmented cores 80A are arranged in an annular shape in the circumferential direction, it is preferable that the teeth 32 are thinner on the yoke 31 side than on the opposite side of the yoke 31 in at least one direction, both axially and circumferentially.

[0085] If the side of tooth 32 facing yoke 31 (the side facing split yoke 81) is thinner than the side facing yoke 31 (the side facing split yoke 81), the number of turns of coil 40A can be increased by using that thinner portion as the winding axis of coil 40A. As a result, in a motor incorporating stator 20A, the magnetic flux passing through coil 40A tends to increase, making it easier to improve the motor's output torque.

[0086] Coil 40A is located on teeth 32 of the split core 80A.

[0087] The terminal board 50A is fixed to the outer circumferential surface 81a of the divided yoke 81 of the divided core 80A in the radial direction.

[0088] As shown in Figure 5, terminal portions 52a and 52b protrude from the second surface 51b of the plate portion 51. More specifically, terminal portions 52a and 52b protrude from the second surface 51b of the plate portion 51 toward the opposite side from the first surface 51a.

[0089] As shown in Figure 6, terminal portions 52a and 52b penetrate the plate portion 51 and are exposed from the first surface 51a of the plate portion 51.

[0090] Terminal portions 52a and 52b do not protrude from the first surface 51a of the plate portion 51. More specifically, terminal portions 52a and 52b do not protrude from the first surface 51a of the plate portion 51 toward the opposite side of the second surface 51b.

[0091] Furthermore, at least one of the terminal portion 52a and terminal portion 52b may protrude from the first surface 51a of the plate portion 51. More specifically, at least one of the terminal portion 52a and terminal portion 52b may protrude from the first surface 51a of the plate portion 51 toward the opposite side of the second surface 51b.

[0092] As shown in Figure 5, the divided yoke 81 of the divided core 80A is provided with a recess 86a that is recessed from the outer peripheral surface 81a.

[0093] The recess 86a is provided on the periphery of the outer circumferential surface 81a of the divided yoke 81. More specifically, the recess 86a extends from the outer circumferential surface 81a of the divided yoke 81 to the end face 81b of the divided yoke 81 in the axial direction.

[0094] The three-dimensional shape of the recess 86a is not limited to the embodiment shown in Figure 5.

[0095] As shown in Figures 5 and 6, the plate portion 51 of the terminal board 50A is provided with a protrusion 55a that extends from the first surface 51a.

[0096] The protrusion 55a is provided on the periphery of the first surface 51a of the plate portion 51.

[0097] The three-dimensional shape of the protrusion 55a is not limited to the embodiments shown in Figures 5 and 6.

[0098] In the coil unit 70A, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are interlocked at the outer circumferential surface interlocking portion 90A, as shown in Figure 5. The outer circumferential surface interlocking portion 90A is formed by the interlocking of a recess 86a and a protrusion 55a. In other words, in the coil unit 70A, the terminal plate 50A is fixed to the outer circumferential surface 81a of the divided yoke 81 by the interlocking of the recess 86a and the protrusion 55a.

[0099] As described above, in the coil unit 70A, the outer peripheral surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are mated at the outer peripheral surface mating portion 90A, which makes it easier to fix the terminal plate 50A to the outer peripheral surface 81a of the divided yoke 81, and makes it easier to position the terminal plate 50A in the axial and circumferential directions.

[0100] In the segmented core 80A, a recess 86a is provided on the outer circumferential surface 81a of the segmented yoke 81, but the recess 86a is formed simultaneously with the molding of the segmented core 80A. In other words, when manufacturing the coil unit 70A, there is no need to perform additional processing on the segmented core 80A after molding in order to provide the recess 86a on the outer circumferential surface 81a of the segmented yoke 81. Therefore, the decrease in the manufacturing efficiency of the coil unit 70A is suppressed.

[0101] Furthermore, during the manufacturing of the coil unit 70A, the recess 86a is formed on the outer circumferential surface 81a of the divided yoke 81, and since no damage is inflicted on the divided core 80A, a decrease in the strength of the coil unit 70A (more specifically, the divided core 80A) is suppressed.

[0102] Therefore, in a stator 20A in which multiple coil units 70A are arranged in a ring in the circumferential direction, even if a recess 86a is provided, a decrease in manufacturing efficiency and a decrease in strength are suppressed.

[0103] In contrast, when the busbar is fixed to the stator core with screws, as in the electric motor described in Patent Document 1, additional processing is required to form screw holes in the stator core after it has been manufactured, which reduces manufacturing efficiency. Furthermore, the stator core is damaged when forming the screw holes, which reduces its strength. Moreover, if the stator core is made of a powdered magnetic core, it is difficult to form screw holes in the stator core at all because the powdered magnetic core is brittle.

[0104] The recess 86a provided on the outer circumferential surface 81a of the divided yoke 81 functions when the first surface 51a of the plate portion 51 and the outer circumferential surface 81a of the divided yoke 81 are engaged, even if it is shallower than, for example, the screw hole described in Patent Document 1. Therefore, in the coil unit 70A, even if the recess 86a is provided on the outer circumferential surface 81a of the divided yoke 81, the effect on the magnetic properties is minimized. Consequently, in the stator 20A in which multiple coil units 70A are arranged in an annular shape in the circumferential direction, even if the recess 86a is provided, the effect on the magnetic properties is minimized.

[0105] In the coil unit 70A, as shown in Figures 2 and 3, it is preferable that the outer end of the terminal plate 50A is not located outside the outer end of the divided yoke 81 in the axial direction. In this case, even with the terminal plate 50A in place, the increase in the thickness of the coil unit 70A is sufficiently suppressed.

[0106] In the coil unit 70A, as shown in Figures 2 and 3, it is preferable that the outer end of the terminal plate 50A is not located outside the outer end of the divided yoke 81 (more specifically, the outer peripheral surface 81a of the divided yoke 81) in the circumferential direction. In this case, compared to the case where the outer end of the terminal plate 50A is located outside the outer end of the divided yoke 81 in the circumferential direction, it becomes easier to arrange multiple coil units 70A in a ring shape in the circumferential direction without interfering with each other during the manufacturing of the stator 20A.

[0107] In the coil unit 70A, in a configuration where the outer end of the terminal plate 50A is not located outside the outer end of the divided yoke 81 in the circumferential direction, the outer end of the terminal plate 50A may be located inside the outer end of the divided yoke 81 in the circumferential direction, as shown in Figures 2 and 3, or it may be located at the same position as the outer end of the divided yoke 81.

[0108] In the stator of the present invention, the outer surface mating portion that mates the outer surface of the yoke with the first surface of the plate portion is not limited to the configuration shown in Figure 5. Other configurations of the outer surface mating portion that mates the outer surface of the yoke with the first surface of the plate portion are described below.

[0109] <Modified form of Embodiment 1> Figure 7 is a schematic perspective view showing a coil unit that constitutes an example of a stator in a modified embodiment 1 of the present invention. Figure 8 is a schematic perspective view showing the divided core and terminal board in Figure 7 in a disassembled state.

[0110] The coil unit 70B shown in Figure 7 comprises a split core 80B, a coil 40A, and a terminal board 50B.

[0111] As shown in Figure 8, the divided yoke 81 of the divided core 80B is provided with a recess 86b that is recessed from the outer peripheral surface 81a.

[0112] The recess 86b is provided on the outer circumferential surface 81a of the divided yoke 81 so as to be aligned with the axial direction.

[0113] The recess 86b may be provided extending from one end to the other in the axial direction of the outer peripheral surface 81a of the divided yoke 81.

[0114] The contour of the recess 86b when viewed from the axial direction may be, for example, curved, straight, or a combination of curved and straight shapes. In the example shown in Figure 8, the contour of the recess 86b when viewed from the axial direction is curved.

[0115] As shown in Figure 8, the plate portion 51 of the terminal board 50B is provided with a protrusion 55b that extends from the first surface 51a.

[0116] The protrusion 55b is provided on the first surface 51a of the plate portion 51 so as to be aligned with the axial direction. More specifically, the protrusion 55b is provided on the first surface 51a of the plate portion 51 from one end to the other in the axial direction so as to be shaped to follow the recess 86b.

[0117] The contour of the convex portion 55b when viewed from the axial direction may be, for example, curved, straight, or a combination of curved and straight shapes. In the example shown in Figure 8, the contour of the convex portion 55b when viewed from the axial direction is curved.

[0118] As shown in Figure 8, in the coil unit 70B, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are interlocked at the outer circumferential surface interlocking portion 90B. The outer circumferential surface interlocking portion 90B is formed by the interlocking of a recess 86b and a protrusion 55b. In other words, in the coil unit 70B, the terminal plate 50B is fixed to the outer circumferential surface 81a of the divided yoke 81 by the interlocking of the recess 86b and the protrusion 55b.

[0119] As described above, in the coil unit 70B, the outer peripheral surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are interlocked at the outer peripheral surface side interlocking portion 90B, which makes it easier to fix the terminal plate 50B to the outer peripheral surface 81a of the divided yoke 81 and facilitates the positioning of the terminal plate 50B in the circumferential direction.

[0120] In the segmented core 80B, a recess 86b is provided on the outer circumferential surface 81a of the segmented yoke 81, but the recess 86b is formed simultaneously with the molding of the segmented core 80B. In other words, when manufacturing the coil unit 70B, there is no need to perform additional processing on the segmented core 80B after molding in order to provide the recess 86b on the outer circumferential surface 81a of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70B is suppressed, and furthermore, the decrease in strength of the coil unit 70B (more specifically, the segmented core 80B) is suppressed.

[0121] In the stator of the present invention, the configuration of the outer surface side mating portion that fits the outer surface of the yoke (divided yoke) with the first surface of the plate portion may be a configuration other than that of Embodiment 1 and its modified form described above.

[0122] For example, the outer circumferential surface mating portion may have a configuration other than that shown in Figures 5 and 8, namely, a configuration in which a recess that is recessed from the outer circumferential surface of the divided yoke and a protrusion that is projecting from the first surface of the plate portion are mated together, or a configuration in which a protrusion that is projecting from the outer circumferential surface of the divided yoke and a recess that is recessed from the first surface of the plate portion are mated together.

[0123] The position of the outer circumferential surface mating portion is not limited to the configurations shown in Figures 5 and 8.

[0124] The total number of outer surface mating portions is not limited to the configurations shown in Figures 5 and 8. In other words, one outer surface mating portion may be provided for a set of divided yokes and plate portions, as shown in Figures 5 and 8, or multiple portions may be provided.

[0125] When multiple outer surface side interlocking portions are provided, the positional relationship of these outer surface side interlocking portions is not particularly limited. For example, the multiple outer surface side interlocking portions may or may not be spaced apart in the axial direction. Alternatively, the multiple outer surface side interlocking portions may or may not be spaced apart in the circumferential direction.

[0126] Furthermore, the outer surface mating portion does not necessarily have to exist. In other words, the outer surface of the yoke (divided yoke) and the first surface of the plate portion do not need to be mated. In this case, for example, the outer surface of the yoke (divided yoke) and the first surface of the plate portion may be joined together as described later.

[0127] <Embodiment 2> In the stator of the present invention, the outer peripheral surface mating portion may overlap the terminal portion in the direction in which the terminal portion extends. In this case, in the stator of the present invention, it is preferable that the convex portion is provided so as to protrude from the first surface of the plate portion in the direction in which the terminal portion extends, and it is preferable that the concave portion is provided so as to be recessed from the outer peripheral surface of the yoke in the direction in which the terminal portion extends. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 2 of the present invention.

[0128] Figure 9 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 2 of the present invention. Figure 10 is a schematic perspective view showing the divided core and terminal board in Figure 9 in a disassembled state. Figure 11 is a schematic cross-sectional view showing an example of a cross-section along line segment a1-a2 of the coil unit (excluding the windings) shown in Figure 9.

[0129] The coil unit 70C shown in Figure 9 comprises a split core 80C, a coil 40A, and a terminal board 50C.

[0130] As shown in Figure 10, the divided yoke 81 of the divided core 80C is provided with a recess 86c that is recessed in the direction in which the terminal portion 52a extends from the outer peripheral surface 81a. Furthermore, the divided yoke 81 of the divided core 80C is provided with a recess 86d that is recessed in the direction in which the terminal portion 52b extends from the outer peripheral surface 81a.

[0131] The recesses 86c and 86d are spaced apart from each other in the circumferential direction.

[0132] The three-dimensional shapes of recesses 86c and 86d are not limited to the embodiments shown in Figure 10.

[0133] The three-dimensional shapes of recesses 86c and 86d may be the same or different.

[0134] As shown in Figure 10, the plate portion 51 of the terminal plate 50C is provided with a protrusion 55c that projects from the first surface 51a in the direction in which the terminal portion 52a extends. Furthermore, the plate portion 51 of the terminal plate 50C is provided with a protrusion 55d that projects from the first surface 51a in the direction in which the terminal portion 52b extends.

[0135] The protrusion 55c overlaps the terminal portion 52a in the direction in which the terminal portion 52a extends.

[0136] The protrusion 55d overlaps the terminal portion 52b in the direction in which the terminal portion 52b extends.

[0137] The protrusions 55c and 55d are spaced apart from each other in the circumferential direction.

[0138] The three-dimensional shapes of the protrusions 55c and 55d are not limited to the embodiments shown in Figure 10.

[0139] The three-dimensional shapes of the convex portions 55c and 55d may be the same or different.

[0140] As shown in Figure 10, in the coil unit 70C, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are interlocked by the outer circumferential surface interlocking portion 90C. The outer circumferential surface interlocking portion 90C includes an outer circumferential surface interlocking portion 90ca formed by the interlocking of a recess 86c and a protrusion 55c, and an outer circumferential surface interlocking portion 90cb formed by the interlocking of a recess 86d and a protrusion 55d. In other words, in the coil unit 70C, the terminal plate 50C is fixed to the outer circumferential surface 81a of the divided yoke 81 by the interlocking of the recess 86c and the protrusion 55c, and by the interlocking of the recess 86d and the protrusion 55d.

[0141] In the outer circumferential mating portion 90C, in the outer circumferential mating portion 90ca, the recess 86c and the protrusion 55c overlap in the direction in which the terminal portion 52a extends. Furthermore, in the outer circumferential mating portion 90C, in the outer circumferential mating portion 90cb, the recess 86d and the protrusion 55d overlap in the direction in which the terminal portion 52b extends. On the other hand, as described above, in the terminal plate 50C, the protrusion 55c and the terminal portion 52a overlap in the direction in which the terminal portion 52a extends. Furthermore, in the terminal plate 50C, the protrusion 55d and the terminal portion 52b overlap in the direction in which the terminal portion 52b extends. Therefore, regarding the positional relationship between the outer circumferential mating portion 90C and the terminal plate 50C, the outer circumferential mating portion 90ca overlaps with the terminal portion 52a in the direction in which the terminal portion 52a extends. Furthermore, the outer circumferential mating portion 90cb overlaps the terminal portion 52b in the direction in which the terminal portion 52b extends.

[0142] As described above, in the coil unit 70C, the outer peripheral surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are interlocked at the outer peripheral surface side interlocking portion 90C, which makes it easier to fix the terminal plate 50C to the outer peripheral surface 81a of the divided yoke 81 and makes it easier to position the terminal plate 50C.

[0143] Thus, in the coil unit 70C, by utilizing only the two outer surface mating portions 90ca and 90cb, the terminal plate 50C can be fixed to the outer surface 81a of the split yoke 81, and the positioning of the terminal plate 50C becomes possible.

[0144] In the segmented core 80C, recesses 86c and 86d are provided on the outer circumferential surface 81a of the segmented yoke 81, but recesses 86c and 86d are formed simultaneously with the molding of the segmented core 80C. In other words, when manufacturing the coil unit 70C, there is no need to perform additional processing on the segmented core 80C after molding in order to provide recesses 86c and 86d on the outer circumferential surface 81a of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70C is suppressed, and furthermore, the decrease in strength of the coil unit 70C (more specifically, the segmented core 80C) is suppressed.

[0145] Furthermore, in the terminal board 50C, a protrusion 55c is provided at a position that overlaps with the terminal portion 52a in the direction in which the terminal portion 52a extends. Therefore, compared to the case where the protrusion 55c is not provided, as shown in Figure 11, it is possible to increase the dimensions of the terminal portion 52a embedded in the plate portion 51 in the direction in which the terminal portion 52a extends. As a result, in the terminal board 50C, the terminal portion 52a is firmly fixed to the plate portion 51. Since the terminal portion 52a, which is firmly fixed to the plate portion 51, is less likely to wobble, the work efficiency when wrapping one end 41a of the winding 41 around the terminal portion 52a is improved.

[0146] In addition, while Figure 11 shows a cross-section of the coil unit 70C at the position where the terminal portion 52a and the protrusion 55c overlap, it is preferable that the cross-section at the position where the terminal portion 52b and the protrusion 55d overlap is the same as in Figure 11.

[0147] <Embodiment 3> In the stator of the present invention, the plate portion may have a first plate portion facing the outer circumferential surface of the yoke, and a second plate portion extending from a part of the first plate portion so as to face the end face of the yoke in the axial direction of the stator core. The first plate portion may have a first surface and a second surface, and the second plate portion may have a third surface located on the end face side of the yoke and a fourth surface located on the opposite side of the end face of the yoke. In this case, in the stator of the present invention, the end face of the yoke and the third surface of the second plate portion may be mated together at an end face side mating portion. Furthermore, in this case, in the stator of the present invention, the end face side mating portion may consist of a convex portion protruding from one of the end face of the yoke and the third surface of the second plate portion, and a concave portion recessed from the other of the end face of the yoke and the third surface of the second plate portion. In this respect, a stator that differs from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 3 of the present invention.

[0148] Figure 12 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 3 of the present invention. Figure 13 is a schematic perspective view showing the divided core and terminal plate in Figure 12 in a disassembled state. Figure 14 is a schematic perspective view showing the terminal plate in Figure 13 viewed from the radially inner side.

[0149] The coil unit 70D shown in Figure 12 comprises a split core 80D, a coil 40A, and a terminal board 50D.

[0150] As shown in Figure 13, the divided yoke 81 of the divided core 80D is provided with a recess 86e that is recessed from the end face 81b in the axial direction.

[0151] The three-dimensional shape of the recess 86e is not limited to the embodiment shown in Figure 13.

[0152] As shown in Figures 13 and 14, the plate portion 51 of the terminal board 50D has a first plate portion 51p and a second plate portion 51q.

[0153] The first plate portion 51p faces the outer circumferential surface 81a of the divided yoke 81.

[0154] The first plate portion 51p has a first surface 51a and a second surface 51b.

[0155] The second plate portion 51q extends from a part of the first plate portion 51p so as to face the end face 81b of the divided yoke 81.

[0156] Preferably, the direction in which the second plate portion 51q extends is perpendicular to the axial direction. In this case, the direction in which the second plate portion 51q extends may be radial, or it may be in a direction different from the radial direction.

[0157] The second plate portion 51q has a third surface 51c located on the end face 81b side of the divided yoke 81, and a fourth surface 51d located on the opposite side of the end face 81b of the divided yoke 81.

[0158] As shown in Figures 13 and 14, the second plate portion 51q is provided with a protrusion 55e that extends from the third surface 51c.

[0159] The three-dimensional shape of the convex portion 55e is not limited to the embodiments shown in Figures 13 and 14.

[0160] As shown in Figure 13, in the coil unit 70D, the end face 81b of the divided yoke 81 and the third face 51c of the second plate portion 51q are interlocked at the end face side interlocking portion 91A. The end face side interlocking portion 91A is formed by the interlocking of a recess 86e and a protrusion 55e. In other words, in the coil unit 70D, the terminal plate 50D is fixed to the end face 81b of the divided yoke 81 while being provided on the outer peripheral surface 81a of the divided yoke 81, due to the interlocking of the recess 86e and the protrusion 55e.

[0161] As described above, in the coil unit 70D, the end face 81b of the divided yoke 81 and the third face 51c of the second plate portion 51q are interlocked at the end face side interlocking portion 91A, which makes it easier to fix the terminal plate 50D to the end face 81b of the divided yoke 81 and facilitates the axial positioning of the terminal plate 50D.

[0162] In the segmented core 80D, a recess 86e is provided on the end face 81b of the segmented yoke 81, but the recess 86e is formed simultaneously with the molding of the segmented core 80D. In other words, when manufacturing the coil unit 70D, there is no need to perform additional processing on the segmented core 80D after molding in order to provide the recess 86e on the end face 81b of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70D is suppressed, and furthermore, the decrease in strength of the coil unit 70D (more specifically, the segmented core 80D) is suppressed.

[0163] In the coil unit 70D, there is a concern that the thickness of the coil unit 70D will increase because the second plate portion 51q is provided on the end face 81b of the divided yoke 81. However, in the coil unit 70D, the thickness of the second plate portion 51q, more specifically, the axial dimension of the second plate portion 51q, is sufficiently smaller than, for example, the thickness of the busbar described in Patent Document 1, so the second plate portion 51q hardly affects the increase in the thickness of the coil unit 70D. For example, if the thickness of the second plate portion 51q is equal to or less than the diameter of the winding 41 (for example, 0.3 mm or more and 0.5 mm or less), the influence of the second plate portion 51q on the increase in the thickness of the coil unit 70D is sufficiently suppressed. Note that the thickness of the second plate portion 51q may be greater than the diameter of the winding 41, as long as it does not affect the increase in the thickness of the coil unit 70D.

[0164] In the coil unit 70D, at least a portion of the second plate portion 51q may be housed in a recess provided on the end face 81b of the divided yoke 81 in the axial direction. In this case, the influence of the second plate portion 51q on increasing the thickness of the coil unit 70D is minimized.

[0165] From this viewpoint, it is preferable that the entirety of the second plate portion 51q is housed in a recess provided in the end face 81b of the divided yoke 81 in the axial direction. In other words, it is preferable that the total thickness of the second plate portion 51q is less than or equal to the depth of the recess in which the second plate portion 51q is housed.

[0166] In addition, in the axial direction, a portion of the second plate portion 51q may be housed in a recess provided on the end face 81b of the divided yoke 81. That is, the thickness of a portion of the second plate portion 51q may be less than or equal to the depth of the recess in which the second plate portion 51q is housed.

[0167] In the stator of the present invention, the end face side mating portion that mates the end face of the yoke with the third surface of the second plate portion is not limited to the configuration shown in Figure 13. Other configurations of the end face side mating portion that mates the end face of the yoke with the third surface of the second plate portion are described below.

[0168] <Modified form of Embodiment 3> In the stator of the present invention, when the end face of the yoke and the third face of the second plate are mated at the end face side mating portion, the end face of the yoke may be provided with a yoke groove along the direction in which the second plate extends, and the end face side mating portion may be formed by mating the yoke groove and the second plate. In this respect, a stator that differs from the stator of Embodiment 3 of the present invention will be described below as a modified example of the stator of Embodiment 3 of the present invention.

[0169] Figure 15 is a schematic perspective view showing a coil unit that constitutes an example of a stator in a modified embodiment 3 of the present invention. Figure 16 is a schematic perspective view showing the divided core and terminal board in Figure 15 in a disassembled state.

[0170] The coil unit 70E shown in Figure 15 comprises a split core 80E, a coil 40A, and a terminal board 50E.

[0171] As shown in Figure 16, the plate portion 51 of the terminal board 50E has a first plate portion 51p, a second plate portion 51qa, and a second plate portion 51qb.

[0172] The second plate portion 51qa extends from a part of the first plate portion 51p so as to face the end face 81b of the divided yoke 81.

[0173] The second plate portion 51qb extends from a part of the first plate portion 51p at a position circumferentially separated from the second plate portion 51qa, and facing the end face 81b of the divided yoke 81.

[0174] The directions in which the second plate portion 51qa and the second plate portion 51qb extend may be the same (they may be parallel to each other) or they may be different (they may not be parallel to each other).

[0175] The second plate portion 51qa has a third surface 51ca located on the end face 81b side of the divided yoke 81, and a fourth surface 51da ​​located on the opposite side of the end face 81b of the divided yoke 81.

[0176] The second plate portion 51qb has a third surface 51cb located on the end face 81b side of the divided yoke 81, and a fourth surface 51db located on the opposite side of the end face 81b of the divided yoke 81.

[0177] As shown in Figure 16, the end face 81b of the divided yoke 81 is provided with a yoke groove 89a that is aligned with the direction in which the second plate portion 51qa extends. Furthermore, the end face 81b of the divided yoke 81 is provided with a yoke groove 89b that is aligned with the direction in which the second plate portion 51qb extends.

[0178] It is preferable that the yoke groove 89a is provided extending from one end to the other end of the end face 81b of the divided yoke 81 in the direction in which the second plate portion 51qa extends. Furthermore, it is preferable that the yoke groove 89b is provided extending from one end to the other end of the end face 81b of the divided yoke 81 in the direction in which the second plate portion 51qb extends.

[0179] The three-dimensional shapes of the yoke groove 89a and yoke groove 89b are not limited to the embodiments shown in Figure 16.

[0180] The three-dimensional shapes of the yoke groove 89a and the yoke groove 89b may be the same or different.

[0181] As shown in Figure 16, in the coil unit 70E, the end face 81b of the divided yoke 81 and the third faces of the second plate portion 51qa and the second plate portion 51qb are interlocked at the end face side interlocking portion 91B. The end face side interlocking portion 91B includes an end face side interlocking portion 91ba formed by the interlocking of the yoke groove 89a and the second plate portion 51qa, and an end face side interlocking portion 91bb formed by the interlocking of the yoke groove 89b and the second plate portion 51qb. In other words, in the coil unit 70E, the terminal plate 50E is fixed to the end face 81b of the divided yoke 81 while being provided on the outer peripheral surface 81a of the divided yoke 81, due to the interlocking of the yoke groove 89a and the second plate portion 51qa, and the interlocking of the yoke groove 89b and the second plate portion 51qb.

[0182] As described above, in the coil unit 70E, the end face 81b of the divided yoke 81 and the third faces of the second plate portion 51qa and the second plate portion 51qb are interlocked at the end face side interlocking portion 91B, which makes it easier to fix the terminal plate 50E to the end face 81b of the divided yoke 81 and makes it easier to position the terminal plate 50E in the axial direction.

[0183] In the segmented core 80E, yoke grooves 89a and 89b are provided on the end face 81b of the segmented yoke 81, but the yoke grooves 89a and 89b are formed simultaneously with the molding of the segmented core 80E. In other words, when manufacturing the coil unit 70E, there is no need to perform additional processing on the segmented core 80E after molding in order to provide the yoke grooves 89a and 89b on the end face 81b of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70E is suppressed, and furthermore, the decrease in strength of the coil unit 70E (more specifically, the segmented core 80E) is suppressed.

[0184] Furthermore, as shown in Figure 15, in the coil unit 70E, the second plate portion 51qa is housed in the yoke groove 89a, and the second plate portion 51qb is housed in the yoke groove 89b. Therefore, the influence of the second plate portions 51qa and 51qb on increasing the thickness of the coil unit 70E is minimized.

[0185] From this perspective, it is preferable that the entirety of the second plate portion 51qa is housed in the yoke groove 89a, and the entirety of the second plate portion 51qb is housed in the yoke groove 89b.

[0186] In the stator of the present invention, the fourth surface of the second plate portion may be provided with a guide groove along the direction in which the second plate portion extends, and the winding may extend toward the terminal portion such that it passes through the guide groove at one end.

[0187] As shown in Figure 16, the fourth surface 51da ​​of the second plate portion 51qa is provided with a guide groove 59a that runs in the direction in which the second plate portion 51qa extends. Furthermore, the fourth surface 51db of the second plate portion 51qb is provided with a guide groove 59b that runs in the direction in which the second plate portion 51qb extends.

[0188] As shown in Figure 15, the winding 41 extends toward the terminal portion 52a, passing through the guide groove 59a at one end 41a. In other words, the guide groove 59a is used as a groove for positioning the winding 41 when leading out one end 41a of the winding 41 to the terminal portion 52a.

[0189] During the manufacturing process of the divided core 80E, the roughness of the boundary between the outer circumferential surface 81a and the end face 81b of the divided yoke 81 increases, and burrs may form at the boundary between the inner circumferential surface and the end face 81b of the divided yoke 81. Therefore, when one end 41a of the winding 41 is led out to the terminal portion 52a, if the end 41a of the winding 41 is in contact with the boundary between the outer circumferential surface 81a and the end face 81b of the divided yoke 81, and the boundary between the inner circumferential surface and the end face 81b of the divided yoke 81, the insulating coating of the winding 41 may be damaged by the aforementioned burrs.

[0190] In contrast, in the coil unit 70E, the winding 41 extends toward the terminal portion 52a such that it passes through the guide groove 59a on one end 41a side. As a result, when one end 41a of the winding 41 is led out to the terminal portion 52a, the one end 41a side of the winding 41 can avoid the boundary between the outer circumferential surface 81a and the end face 81b of the divided yoke 81 and the boundary between the inner circumferential surface and the end face 81b of the divided yoke 81, thereby preventing damage to the insulating coating of the winding 41.

[0191] As shown in Figure 15, the winding 41 extends toward the terminal portion 52b so that it passes through the guide groove 59b at the other end 41b. In other words, the guide groove 59b is used as a groove for positioning the winding 41 when leading out the other end 41b of the winding 41 to the terminal portion 52b.

[0192] In the coil unit 70E, the winding 41 extends toward the terminal portion 52b such that it passes through the guide groove 59b on the other end 41b side. As a result, when the other end 41b of the winding 41 is led out to the terminal portion 52b, the other end 41b of the winding 41 can avoid the boundary between the outer circumferential surface 81a and the end face 81b of the divided yoke 81 and the boundary between the inner circumferential surface and the end face 81b of the divided yoke 81, thus preventing damage to the insulating coating of the winding 41.

[0193] In the stator of the present invention, the configuration of the end face side mating portion that fits the end face of the yoke (divided yoke) with the third face of the second plate portion may be a configuration other than that of Embodiment 3 and its modified form described above.

[0194] For example, the end face mating portion may have a configuration other than that shown in Figure 13, namely, a configuration in which a recess extending from the end face of the divided yoke and a protrusion extending from the third surface of the second plate portion are mated together, or a configuration in which a protrusion extending from the end face of the divided yoke and a recess extending from the third surface of the second plate portion are mated together.

[0195] The position of the end face side mating portion is not limited to the configuration shown in Figures 13 and 16.

[0196] The total number of end-face side mating portions is not limited to the configurations shown in Figures 13 and 16. In other words, for a set of divided yokes and plate portions, there may be one end-face side mating portion as shown in Figure 13, two as shown in Figure 16, or three or more.

[0197] When multiple end face side mating portions are provided, the positional relationship of these end face side mating portions is not particularly limited. For example, the multiple end face side mating portions may be spaced apart in the circumferential direction as shown in Figure 16, or they may not be spaced apart in the circumferential direction. Alternatively, the multiple end face side mating portions may be spaced apart in the radial direction, or they may not be spaced apart in the radial direction.

[0198] Furthermore, the end face mating portion does not necessarily have to exist. In other words, the end face of the yoke (divided yoke) and the third surface of the second plate portion do not have to be mated. In this case, for example, the end face of the yoke (divided yoke) and the third surface of the second plate portion may be joined together.

[0199] <Embodiment 4> In the stator of the present invention, the outer circumferential surface of the yoke and the first surface of the plate portion may be joined together. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 4 of the present invention.

[0200] Figure 17 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 4 of the present invention. Figure 18 is a schematic perspective view showing the divided core and terminal board in Figure 17 in a disassembled state.

[0201] The coil unit 70F shown in Figure 17 comprises a split core 80F, a coil 40A, and a terminal board 50F.

[0202] In the coil unit 70F, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are joined together. In other words, the terminal plate 50F is fixed to the outer circumferential surface 81a of the divided yoke 81 at a joint (not shown).

[0203] Examples of joints include adhesives.

[0204] As described above, in the coil unit 70F, the outer surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are joined together, making it easier to fix the terminal plate 50F to the outer surface 81a of the divided yoke 81 and facilitating the positioning of the terminal plate 50F.

[0205] Thus, unlike the coil unit 70A and the like, the coil unit 70F has a simple structure that does not utilize a mating section, as shown in Figure 18, which allows the terminal plate 50F to be fixed to the outer surface 81a of the split yoke 81, and enables the positioning of the terminal plate 50F.

[0206] Furthermore, even in configurations such as coil unit 70A, where the terminal plate is fixed to the outer surface of the split yoke using the mating portion on the outer surface, the outer surface of the split yoke and the first surface of the plate portion may be joined in addition to being mated.

[0207] Furthermore, in embodiments such as the coil unit 70D, where the terminal plate is fixed to the end face of the split yoke using the end face side mating portion, the end face of the split yoke and the third surface of the plate portion (second plate portion) may be joined in addition to being mated.

[0208] <Embodiment 5> In the stator of the present invention, the outer circumferential surface of the yoke may have a first outer circumferential surface, a second outer circumferential surface located inward from the first outer circumferential surface in the radial direction, and a stepped surface connecting the first outer circumferential surface and the second outer circumferential surface, and the terminal plate may be provided on the stepped surface. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 5 of the present invention.

[0209] Figure 19 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 5 of the present invention. Figure 20 is a schematic perspective view showing the divided core and terminal board in Figure 19 in a disassembled state.

[0210] The coil unit 70G shown in Figure 19 comprises a split core 80G, a coil 40A, and a terminal board 50F.

[0211] The terminal board 50F of coil unit 70G has the same configuration as the terminal board 50F of coil unit 70F.

[0212] As shown in Figure 20, the outer circumferential surface 81a of the divided yoke 81 has a first outer circumferential surface 81aa, a second outer circumferential surface 81ab, and a stepped surface 81ac.

[0213] The first outer peripheral surface 81aa of the divided yoke 81 is located in the axial direction opposite to the end surface 81b compared to the second outer peripheral surface 81ab (downward in the axial direction in Figure 20).

[0214] The first outer peripheral surface 81aa of the divided yoke 81 may be located on the end face 81b side (upward in the axial direction in Figure 20) than the second outer peripheral surface 81ab in the axial direction.

[0215] The second outer surface 81ab of the divided yoke 81 is located radially inward from the first outer surface 81aa. In other words, when viewed from the axial direction, the second outer surface 81ab of the divided yoke 81 is radially inward relative to the first outer surface 81aa.

[0216] The stepped surface 81ac of the divided yoke 81 connects the first outer surface 81aa and the second outer surface 81ab.

[0217] In the example shown in Figure 20, the stepped surface 81ac of the divided yoke 81 extends in the circumferential direction. More specifically, the stepped surface 81ac of the divided yoke 81 extends from one end to the other in the circumferential direction of the outer peripheral surface 81a.

[0218] Furthermore, the stepped surface 81ac of the divided yoke 81 does not necessarily extend from one end to the other in the circumferential direction of the outer peripheral surface 81a. For example, the stepped surface 81ac of the divided yoke 81 may be provided in part of the path from one end to the other in the circumferential direction of the outer peripheral surface 81a.

[0219] As shown in Figure 19, in the coil unit 70G, the terminal board 50F is provided on the stepped surface 81ac of the divided yoke 81.

[0220] In the coil unit 70G, the terminal plate 50F is positioned on the stepped surface 81ac of the divided yoke 81, so that the stepped surface 81ac of the divided yoke 81 functions as a structure for positioning the terminal plate 50F in the axial direction. In other words, in the coil unit 70G, the stepped surface 81ac of the divided yoke 81 facilitates the axial positioning of the terminal plate 50F.

[0221] Furthermore, in the coil unit 70G, since the terminal plate 50F is provided on the stepped surface 81ac of the divided yoke 81, the increase in the radial dimension of the coil unit 70G is suppressed even when the terminal plate 50F is provided.

[0222] From this viewpoint, it is preferable that, in the radial direction, the entire second surface 51b of the plate portion 51 is not located outside the outer end of the stepped surface 81ac of the divided yoke 81. In other words, it is preferable that the overall radial dimension of the plate portion 51 is less than or equal to the radial dimension of the stepped surface 81ac of the divided yoke 81.

[0223] Furthermore, in the radial direction, a portion of the second surface 51b of the plate portion 51 does not necessarily have to be located outside the outer end of the stepped surface 81ac of the divided yoke 81. In other words, the radial dimension of a portion of the plate portion 51 may be less than or equal to the radial dimension of the stepped surface 81ac of the divided yoke 81.

[0224] In the coil unit 70G, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are joined together, for example. Alternatively, in the coil unit 70G, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 may be joined at an outer circumferential surface side joint, as in the coil unit 70A, etc.

[0225] <Embodiment 6> In the stator of the present invention, the outer circumferential surface of the yoke may be provided with a recess that overlaps the terminal portion in the direction in which the terminal portion extends, and the terminal portion may be spaced apart from the bottom surface of the recess in the direction in which the terminal portion extends. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 6 of the present invention.

[0226] Figure 21 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 6 of the present invention. Figure 22 is a schematic perspective view showing the divided core and terminal board in Figure 21 in a disassembled state. Figure 23 is a schematic cross-sectional view showing an example of a cross-section along line segment b1-b2 of the coil unit (excluding the windings) shown in Figure 21.

[0227] The coil unit 70H shown in Figure 21 comprises a split core 80H, a coil 40A, and a terminal board 50F.

[0228] The terminal board 50F of coil unit 70H has the same configuration as the terminal board 50F of coil unit 70F.

[0229] As shown in Figure 22, recesses 87a and 87b are provided on the outer circumferential surface 81a of the divided yoke 81 of the divided core 80H.

[0230] The depressions 87a and 87b are spaced apart from each other in the circumferential direction.

[0231] The three-dimensional shapes of recesses 87a and 87b may be the same or different.

[0232] In the coil unit 70H, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are joined, for example. Alternatively, in the coil unit 70H, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 may be joined at an outer circumferential surface side joint, as in the coil unit 70A, etc.

[0233] In the coil unit 70H, with the terminal plate 50F fixed to the outer circumferential surface 81a of the divided yoke 81, the recess 87a overlaps the terminal portion 52a in the direction in which the terminal portion 52a extends, as shown in Figure 23. Furthermore, in the coil unit 70H, with the terminal plate 50F fixed to the outer circumferential surface 81a of the divided yoke 81, the terminal portion 52a is separated from the bottom surface of the recess 87a in the direction in which the terminal portion 52a extends, as shown in Figure 23. As a result, even if the terminal portion 52a is exposed from the first surface 51a of the plate portion 51, or even if the terminal portion 52a protrudes from the first surface 51a of the plate portion 51, the terminal portion 52a does not come into contact with the divided yoke 81 while the terminal plate 50F is fixed to the outer circumferential surface 81a of the divided yoke 81. Therefore, according to the structure shown in Figure 23, insulation between the divided yoke 81 and the terminal portion 52a is ensured. Furthermore, according to the structure shown in Figure 23, when electrically connecting one end 41a of the winding 41 to the terminal of the connecting substrate, as will be described later, for example, when using solder joints, the heat generated during solder joints is less likely to be transmitted from the terminal portion 52a to the split yoke 81. As a result, damage to the split core 80H is less likely to occur, thus suppressing a decrease in the strength of the coil unit 70H (more specifically, the split core 80H).

[0234] In the coil unit 70H, with the terminal plate 50F fixed to the outer circumferential surface 81a of the split yoke 81, the recess 87b overlaps the terminal portion 52b in the direction in which the terminal portion 52b extends, similar to Figure 23. Furthermore, in the coil unit 70H, with the terminal plate 50F fixed to the outer circumferential surface 81a of the split yoke 81, the terminal portion 52b is separated from the bottom surface of the recess 87b in the direction in which the terminal portion 52b extends, similar to Figure 23.

[0235] In the coil unit 70H, with the terminal plate 50F fixed to the outer peripheral surface 81a of the divided yoke 81, it is sufficient that at least one of the terminal portion 52a and terminal portion 52b is separated from the bottom surface of the recess in the direction in which the terminal portion extends, or that only one of the terminal portion 52a and terminal portion 52b is separated from the bottom surface of the recess in the direction in which the terminal portion extends.

[0236] In the segmented core 80H, recesses 87a and 87b are provided on the outer circumferential surface 81a of the segmented yoke 81, but recesses 87a and 87b are formed simultaneously with the molding of the segmented core 80H. In other words, when manufacturing the coil unit 70H, there is no need to perform additional processing on the segmented core 80H after molding in order to provide recesses 87a and 87b on the outer circumferential surface 81a of the segmented yoke 81. Therefore, a decrease in the manufacturing efficiency of the coil unit 70H is suppressed, and furthermore, a decrease in the strength of the coil unit 70H (more specifically, the segmented core 80H) is suppressed.

[0237] In addition, other coil units such as coil unit 70A (excluding coil unit 70C) may also have a recess on the outer surface of the split yoke that overlaps the terminal portion in the direction in which the terminal portion extends, and the terminal portion may be separated from the bottom surface of the recess in the direction in which the terminal portion extends.

[0238] <Embodiment 7> In the stator of the present invention, the terminal portion does not need to penetrate between the first surface and the second surface of the plate portion. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 7 of the present invention.

[0239] Figure 24 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 7 of the present invention. Figure 25 is a schematic perspective view showing the divided core and terminal board in Figure 24 in a disassembled state. Figure 26 is a schematic cross-sectional view showing an example of a cross-section along the line segment c1-c2 of the coil unit shown in Figure 24.

[0240] The coil unit 70J shown in Figure 24 comprises a split core 80F, a coil 40A, and a terminal board 50J.

[0241] The segmented core 80F of coil unit 70J has the same configuration as the segmented core 80F of coil unit 70F.

[0242] In the coil unit 70J, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are joined, for example. Alternatively, in the coil unit 70J, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 may be joined at an outer circumferential surface side joint, as in the coil unit 70A, etc.

[0243] In the coil unit 70J, as shown in Figure 26, the terminal portion 52a of the terminal plate 50J does not penetrate between the first surface 51a and the second surface 51b of the plate portion 51. In other words, in the terminal plate 50J, the terminal portion 52a is not exposed from the first surface 51a of the plate portion 51. This makes it possible to have a structure in which the terminal portion 52a does not come into contact with the divided yoke 81 while the terminal plate 50J is fixed to the outer peripheral surface 81a of the divided yoke 81. Therefore, according to the structure shown in Figure 26, insulation between the divided yoke 81 and the terminal portion 52a is ensured. Furthermore, according to the structure shown in Figure 26, when electrically connecting one end 41a of the winding 41 to the terminal of the connecting substrate, as will be described later, for example, when using solder joints, the heat generated during solder joints is less likely to be transmitted from the terminal portion 52a to the split yoke 81. As a result, damage to the split core 80F is less likely to occur, thus suppressing a decrease in the strength of the coil unit 70J (more specifically, the split core 80F).

[0244] In the coil unit 70J, in the terminal board 50J, it is sufficient that at least one of the terminal portions 52a and 52b does not penetrate between the first surface 51a and the second surface 51b of the plate portion 51, and it is also acceptable that only one of the terminal portions 52a and 52b does not penetrate between the first surface 51a and the second surface 51b of the plate portion 51.

[0245] For example, in the terminal board 50J, if the terminal portion 52a does not penetrate between the first surface 51a and the second surface 51b of the plate portion 51, the terminal portion 52b does not have to penetrate between the first surface 51a and the second surface 51b of the plate portion 51, or it does penetrate between the first surface 51a and the second surface 51b of the plate portion 51.

[0246] Furthermore, in other coil units such as coil unit 70A, the terminal portion does not necessarily have to penetrate between the first and second surfaces of the plate portion.

[0247] <Embodiment 8> In the stator of the present invention, the terminal portion may penetrate between the first surface and the second surface of the plate portion. In this case, the bottom of the terminal portion may have a shape that is wider than the portion other than the bottom in a direction perpendicular to the direction in which the terminal portion extends. Furthermore, in this case, the bottom of the terminal portion may be separated from the outer circumferential surface of the yoke in the direction in which the terminal portion extends. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 8 of the present invention.

[0248] Figure 27 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 8 of the present invention. Figure 28 is a schematic perspective view showing the divided core and terminal board in Figure 27 in a disassembled state. Figure 29 is a schematic cross-sectional view showing an example of a cross-section along the line segment d1-d2 of the coil unit shown in Figure 27.

[0249] The coil unit 70K shown in Figure 27 comprises a split core 80F, a coil 40A, and a terminal board 50K.

[0250] The split core 80F of coil unit 70K has the same configuration as the split core 80F of coil unit 70F.

[0251] In the coil unit 70K, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 are joined together, for example. Alternatively, in the coil unit 70K, the outer circumferential surface 81a of the divided yoke 81 and the first surface 51a of the plate portion 51 may be joined at an outer circumferential surface side joint, as in the coil unit 70A, etc.

[0252] In the coil unit 70K, as shown in Figure 29, the terminal portion 52a of the terminal board 50K penetrates between the first surface 51a and the second surface 51b of the plate portion 51. In other words, in the terminal board 50K, the terminal portion 52a is exposed from the first surface 51a of the plate portion 51.

[0253] In the coil unit 70K, as shown in Figure 29, the bottom of the terminal portion 52a of the terminal plate 50K has a shape that is wider than the rest of the terminal portion in a direction perpendicular to the direction in which the terminal portion 52a extends (axial direction in Figure 29). This wider shape of the bottom of the terminal portion 52a makes it difficult for the terminal portion 52a to come loose from the plate portion 51.

[0254] In the coil unit 70K, as shown in Figure 29, the bottom of the terminal portion 52a of the terminal plate 50K is separated from the outer circumferential surface 81a of the divided yoke 81 in the direction in which the terminal portion 52a extends. In other words, a cavity 88 is provided between the terminal portion 52a and the divided yoke 81. As a result, even if the terminal portion 52a penetrates between the first surface 51a and the second surface 51b of the plate portion 51, the terminal plate 50K is fixed to the outer circumferential surface 81a of the divided yoke 81, and the terminal portion 52a does not come into contact with the divided yoke 81. Therefore, according to the structure shown in Figure 29, insulation between the divided yoke 81 and the terminal portion 52a is ensured. Furthermore, according to the structure shown in Figure 29, when electrically connecting one end 41a of the winding 41 to the terminal of the connecting substrate, as will be described later, for example, when using solder joints, the heat generated during solder joints is less likely to be transmitted from the terminal portion 52a to the split yoke 81. As a result, damage to the split core 80F is less likely to occur, thus suppressing a decrease in the strength of the coil unit 70K (more specifically, the split core 80F).

[0255] The terminal board 50K having the structure shown in Figure 29 can be manufactured, for example, by press-fitting the terminal portion 52a from the first surface 51a side of the plate portion 51. With this manufacturing method, the terminal portion 52a can be easily fixed to the plate portion 51, which makes it easier to improve the manufacturing efficiency of the terminal board 50K.

[0256] In the coil unit 70K, in the terminal board 50K, it is sufficient that at least one of the terminal portion 52a and terminal portion 52b penetrates between the first surface 51a and the second surface 51b of the plate portion 51, or that only one of the terminal portion 52a and terminal portion 52b penetrates between the first surface 51a and the second surface 51b of the plate portion 51.

[0257] For example, in the terminal board 50K, if the terminal portion 52a penetrates between the first surface 51a and the second surface 51b of the plate portion 51, the terminal portion 52b may or may not penetrate between the first surface 51a and the second surface 51b of the plate portion 51.

[0258] In the terminal board 50K, if the terminal portion 52b penetrates between the first surface 51a and the second surface 51b of the plate portion 51, the bottom of the terminal portion 52b may have a shape that is wider than the rest of the terminal portion in a direction perpendicular to the direction in which the terminal portion 52b extends. Furthermore, similar to Figure 29, the bottom of the terminal portion 52b may be separated from the outer peripheral surface 81a of the divided yoke 81 in the direction in which the terminal portion 52b extends.

[0259] In addition, in other coil units such as coil unit 70A, the terminal portion may also penetrate between the first and second surfaces of the plate portion.

[0260] <Embodiment 9> In the embodiments described above, the terminal board is shown to have two terminal portions. However, in the stator of the present invention, the terminal board may have only one terminal portion. In other words, in the stator of the present invention, only one end of the winding may be fixed in a state where it is wrapped around the terminal portion. A stator that differs in this respect from the stator of Embodiment 4 of the present invention will be described below as the stator of Embodiment 9 of the present invention.

[0261] Figure 30 is a schematic perspective view showing an example of a stator according to Embodiment 9 of the present invention. Figure 31 is a schematic perspective view showing the coil unit in Figure 30.

[0262] The stator 20L shown in FIG. 30 has a coil unit 70L.

[0263] The coil unit 70L shown in FIG. 31 has a split core 80F, a coil 40A, and a terminal board 50L.

[0264] The split core 80F included in the coil unit 70L has the same configuration as the split core 80F included in the coil unit 70F.

[0265] The terminal board 50L has a plate portion 51 and a terminal portion 52a.

[0266] One end portion 41a of the winding 41 is fixed in a state of being wound around the terminal portion 52a. Thereby, one end portion 41a of the winding 41 is led out to the terminal board 50L.

[0267] In the stator 20L, the coil unit 70L is used, for example, when connecting the windings 41 of a plurality of coils 40A in series connection. At this time, as shown in FIG. 30, in addition to the coil unit 70L, the stator 20L may further have a coil unit 71L in which both end portions of the winding 41 are not led out to the terminal board. That is, in the stator 20L, the coil unit 70L having a structure in which one end portion 41a of the winding 41 is led out to the terminal board and the coil unit 71L having a structure in which both end portions of the winding 41 are not led out to the terminal board may be mixed. In this case, since it is not necessary to provide a terminal board for all the coil units, the cost related to the terminal board can be reduced.

[0268] Note that in other coil units such as the coil unit 70A, the terminal board may have only one terminal portion.

[0269] In the above embodiment, an aspect in which the stator core has a split structure divided into split cores is shown, but in the stator of the present invention, the stator core may have an integral structure that is not divided.

[0270] In a stator with a segmented stator core, the coils 40A can be arranged more densely compared to a stator with a single-piece stator core, resulting in a greater number of coils 40A. Therefore, a stator with a segmented stator core makes it easier to improve the motor's characteristics compared to a stator with a single-piece stator core.

[0271] The stator of the present invention may be used not only as a component of a motor described later, but also, for example, as a component of a generator.

[0272] [motor] The motor of the present invention is characterized by comprising a stator of the present invention and a rotor provided opposite to the inner circumferential surface of the stator.

[0273] <Embodiment 10> An example of the motor of the present invention will be described below as the motor of Embodiment 10 of the present invention.

[0274] Figure 32 is a schematic perspective view showing an example of a motor according to Embodiment 10 of the present invention.

[0275] The motor 1A shown in Figure 32 has a rotor 10A and a stator 20A.

[0276] In motor 1A, the rotor 10A is located coaxially on the inside of the axis AX, and the stator 20A is located coaxially on the outside. The axis AX corresponds to the rotation axis of the rotor 10A.

[0277] The rotor 10A is positioned opposite the inner circumferential surface of the stator 20A.

[0278] The rotor 10A includes, for example, a rotor yoke 11, a shaft 12, and a permanent magnet 13.

[0279] The rotor yoke 11 is composed of, for example, a bulk soft magnetic material, an electromagnetic steel sheet, a compacted magnetic core, or a resin molded body containing a soft magnetic material.

[0280] The shaft 12 is inserted through the rotor yoke 11.

[0281] Examples of materials used to construct the shaft 12 include metals such as stainless steel.

[0282] The direction in which the shaft 12 extends, that is, the direction in which the axis AX extends, is parallel to the axial direction.

[0283] The permanent magnets 13 are arranged along the outer surface of the rotor yoke 11 such that the north poles and south poles are arranged alternately.

[0284] When viewed from the axial direction, the rotor 10A may be approximately circular in shape or approximately polygonal in shape.

[0285] In this embodiment, a motor having a stator 20A in which a plurality of coil units 70A are arranged in a ring in the circumferential direction is shown, but the same applies to a motor having a stator in which other coil units, such as coil units 70B, are arranged in a ring in the circumferential direction.

[0286] <Embodiment 11> The motor of the present invention may further include a connection board electrically connected to one end of the winding. In this case, the connection board in the motor of the present invention may be provided so as to face the terminal plate on the outer surface of the yoke. A motor that differs in this respect from the motor of Embodiment 10 of the present invention will be described below as the motor of Embodiment 11 of the present invention.

[0287] Figure 33 is a schematic perspective view showing an example of a motor according to Embodiment 11 of the present invention.

[0288] The motor 1B shown in Figure 33 has a rotor 10A and a stator 20A, as well as a wiring board 25A.

[0289] The connection board 25A is electrically connected to one end 41a of the winding 41 of the coil 40A of the stator 20A. Further, the connection board 25A is preferably electrically connected to the other end 41b of the winding 41 of the coil 40A of the stator 20A. An example of this connection mode will be described below.

[0290] The connection board 25A is provided with a plurality of through holes 26 penetrating between one main surface and the other main surface so as to be spaced apart from each other in the circumferential direction.

[0291] In the connection board 25A, terminals (not shown) are exposed on the inner wall surfaces of the respective through holes 26.

[0292] In the motor 1B, the connection board 25A is provided so as to face the terminal board 50A on the outer peripheral surface 31a of the yoke 31. More specifically, the connection board 25A is wound around the stator 20A in the circumferential direction so that the terminal portions 52a and 52b pass through separate through holes 26. On the other hand, one end 41a of the winding 41 is fixed to the terminal portion 52a in a state of being wound around it, and the other end 41b of the winding 41 is fixed to the terminal portion 52b in a state of being wound around it.

[0293] Therefore, according to the motor 1B in which the connection board 25A is wound around the stator 20A in the circumferential direction as described above, one end 41a of the winding 41 wound around the terminal portion 52a and the other end 41b of the winding 41 wound around the terminal portion 52b can be efficiently connected to the terminals exposed from the inner wall surfaces of separate through holes 26. Further, in the motor 1B, since the connection board 25A is provided so as to face the terminal board 50A on the outer peripheral surface 31a of the yoke 31, an increase in the thickness of the motor 1B, more specifically, an increase in the axial dimension of the motor 1B is suppressed. Therefore, according to the motor 1B, it is possible to easily realize the electrical connection between one end 41a of the winding 41 and the terminal of the connection board 25A, and the electrical connection between the other end 41b of the winding 41 and the terminal of the connection board 25A while suppressing an increase in thickness.

[0294] Since the wiring substrate 25A is used while wound around the stator 20A in the circumferential direction, it is preferable that the substrate be highly flexible, such as a flexible printed circuit board (FPC).

[0295] This specification discloses the following:

[0296] <1> A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of windings wound around the teeth mentioned above, The yoke comprises a terminal plate provided on the outer circumferential surface of the yoke in the radial direction, The above terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the radial direction, a first surface located on the outer circumferential surface side of the yoke, and a second surface located on the opposite side of the outer circumferential surface of the yoke. The terminal portion described above protrudes from at least the second surface of the plate portion, A stator characterized in that one end of the winding is fixed in a state where it is wrapped around the terminal portion.

[0297] <2> The outer circumferential surface of the yoke and the first surface of the plate portion are mated at the outer circumferential surface mating portion. <1> The status listed.

[0298] <3> The outer peripheral surface mating portion is formed by mating a convex portion protruding from one of the outer peripheral surface of the yoke and the first surface of the plate portion with a concave portion recessed from the other of the outer peripheral surface of the yoke and the first surface of the plate portion. <2> The status listed.

[0299] <4> The outer peripheral mating portion described above overlaps the terminal portion in the direction in which the terminal portion extends. <3> The status listed.

[0300] <5> The above-mentioned protrusion is provided so as to protrude from the first surface of the plate portion in the direction in which the terminal portion extends. The recess is provided so as to be recessed from the outer circumferential surface of the yoke in the direction in which the terminal portion extends. <4> The status listed.

[0301] <6> The plate portion has a first plate portion facing the outer circumferential surface of the yoke, and a second plate portion extending from a part of the first plate portion so as to face the end face of the yoke in the axial direction of the stator core. The above-mentioned first plate portion has the above-mentioned first surface and the above-mentioned second surface, The second plate portion has a third surface located on the end face side of the yoke and a fourth surface located on the opposite side of the end face of the yoke. <1> ~ <5> The status listed in any of the following.

[0302] <7> The end face of the yoke and the third surface of the second plate are joined at the end face side joint. <6> The status listed.

[0303] <8> The above end face side mating portion is formed by mating a convex portion protruding from one of the end face of the yoke and the third surface of the second plate portion with a concave portion recessed from the other end face of the yoke and the third surface of the second plate portion. <7> The status listed.

[0304] <9> The end face of the yoke is provided with a yoke groove that runs in the direction in which the second plate extends. The above end face side mating portion is formed by mating the yoke groove and the second plate portion. <7> The status listed.

[0305] <10> A guide groove is provided on the fourth surface of the second plate portion, along the direction in which the second plate portion extends. The winding described above extends toward the terminal portion so as to pass through the guide groove at one end. <6> ~ <9> The status listed in any of the following.

[0306] <11> The outer circumferential surface of the yoke and the first surface of the plate are joined together. <1> ~ <10> The status listed in any of the following.

[0307] <12> The outer circumferential surface of the yoke has a first outer circumferential surface, a second outer circumferential surface located inward from the first outer circumferential surface in the radial direction, and a stepped surface connecting the first outer circumferential surface and the second outer circumferential surface. The above terminal board is provided on the stepped surface, <1> ~ <11> The status listed in any of the following.

[0308] <13> The outer circumferential surface of the yoke is provided with a recess that overlaps the terminal portion in the direction in which the terminal portion extends. The above-mentioned terminal portion is separated from the bottom surface of the recess in the direction in which the terminal portion extends. <1> ~ <12> The status listed in any of the following.

[0309] <14> The terminal portion described above does not penetrate between the first surface and the second surface of the plate portion. <1> ~ <13> The status listed in any of the following.

[0310] <15> The terminal portion described above penetrates between the first surface and the second surface of the plate portion. <1> ~ <13> The status listed in any of the following.

[0311] <16> The bottom of the terminal portion has a shape that is wider than the rest of the terminal portion in a direction perpendicular to the direction in which the terminal portion extends. <15> The status listed.

[0312] <17> The bottom of the above-mentioned terminal portion is separated from the above-mentioned outer surface of the yoke in the direction in which the above-mentioned terminal portion extends. <15> or <16> The status listed.

[0313] <18> The terminal plate is provided along the boundary between the outer circumferential surface of the yoke and the end face of the yoke in the axial direction of the stator core. <1> ~ <17> The status listed in any of the following.

[0314] <19> Multiple coil units are arranged in a ring shape in the circumferential direction as described above. Each of the above-mentioned coil units independently comprises a divided core formed by dividing the stator core in the circumferential direction, the coil, and the terminal plate. <1> ~ <18> The status listed in any of the following.

[0315] <20> The stator core described above is composed of a compacted magnetic core. <1> ~ <19> The status listed in any of the following.

[0316] <21> The above terminal portion is made of a conductive material. <1> ~ <20> The status listed in any of the following.

[0317] <22> <1> ~ <21> The status listed in any of the following, A motor characterized by comprising a rotor provided opposite the inner circumferential surface of the stator described above.

[0318] <23> The winding further comprises a connection board electrically connected to one end of the winding. <22> The motor described above.

[0319] <24> The above-mentioned wiring board is provided on the outer surface of the yoke so as to face the above-mentioned terminal plate. <23> The motor described above. [Explanation of symbols]

[0320] 1A, 1B motors 10A Rotor 11 Rotor yoke 12 shafts 13 Permanent Magnets 20A, 20L stator 25A Wiring Board 26 Through-holes 30A stator core 31 York 31a Outer surface of the yoke 31b End face of the yoke 32 Teeth 40A coil 41 Winding 41a One end of the winding 41b The other end of the winding 50A, 50B, 50C, 50D, 50E, 50F, 50J, 50K, 50L terminal board 51 Board part 51a First surface of the plate section (first plate section) 51b Second surface of the plate section (first plate section) 51c, 51ca, 51cb: Third surface of the plate section (second plate section) 51d, 51da, 51db: Fourth surface of the plate section (second plate section) 51p 1st plate part 51q, 51qa, 51qb 2nd plate section 52a, 52b terminal section 55a, 55b, 55c, 55d, 55e Protrusions on the plate portion 59a, 59b Guide grooves 70A, 70B, 70C, 70D, 70E, 70F, 70G, 70H, 70J, 70K, 70L, 71L Coil Units 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H Split Core 81-part yoke 81a Outer surface of the divided yoke 81aa First outer surface of the divided yoke 81ab Second outer surface of the split yoke 81ac Stepped surface of the split yoke 81b End face of the split yoke 86a, 86b, 86c, 86d, 86e Recesses in the divided yoke 87a, 87b Recess in the divided yoke 88 Hollow 89a, 89b Yoke groove 90A, 90B, 90C, 90ca, 90cb Outer peripheral side joint 91A, 91B, 91ba, 91bb End face side mating parts AX axis

Claims

1. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The yoke comprises a terminal plate provided on the outer circumferential surface of the yoke in the radial direction, The yoke has an end face in the axial direction of the stator core, The terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the radial direction, a first surface located on the outer circumferential surface side of the yoke, and a second surface located on the opposite side of the outer circumferential surface of the yoke. The terminal portion protrudes from at least the second surface of the plate portion, A stator characterized in that one end of the winding is led out from the inner circumferential surface side of the yoke, through the end face of the yoke, to the second surface side of the plate portion, and fixed in a state where it is wrapped around the terminal portion.

2. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The yoke comprises a terminal plate provided on the outer circumferential surface of the yoke in the radial direction, The terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the radial direction, a first surface located on the outer circumferential surface side of the yoke, and a second surface located on the opposite side of the outer circumferential surface of the yoke. The terminal portion protrudes from at least the second surface of the plate portion, One end of the winding is fixed in place, wrapped around the terminal portion. A stator characterized in that the outer peripheral surface of the yoke and the first surface of the plate portion are mated at the outer peripheral surface side mating portion.

3. The stator according to claim 1, wherein the outer peripheral surface of the yoke and the first surface of the plate portion are mated at the outer peripheral surface side mating portion.

4. The stator according to claim 2 or 3, wherein the outer peripheral surface mating portion is formed by mating a convex portion protruding from one of the outer peripheral surface of the yoke and the first surface of the plate portion with a concave portion recessed from the other of the outer peripheral surface of the yoke and the first surface of the plate portion.

5. The stator according to claim 4, wherein the outer peripheral surface mating portion overlaps the terminal portion in the direction in which the terminal portion extends.

6. The protrusion is provided so as to project from the first surface of the plate portion in the direction in which the terminal portion extends. The stator according to claim 5, wherein the recess is provided so as to be recessed from the outer circumferential surface of the yoke in the direction in which the terminal portion extends.

7. The plate portion has a first plate portion facing the outer circumferential surface of the yoke, and a second plate portion extending from a part of the first plate portion so as to face the end face of the yoke in the axial direction of the stator core. The first plate portion has a first surface and a second surface, The stator according to any one of claims 1 to 3, wherein the second plate portion has a third surface located on the end face side of the yoke and a fourth surface located on the opposite side of the end face of the yoke.

8. The stator according to claim 7, wherein the end face of the yoke and the third face of the second plate portion are mated at the end face side mating portion.

9. The stator according to claim 8, wherein the end face side mating portion is formed by mating a convex portion protruding from one of the end face of the yoke and the third surface of the second plate portion with a concave portion recessed from the other of the end face of the yoke and the third surface of the second plate portion.

10. The end face of the yoke is provided with a yoke groove that runs in the direction in which the second plate extends. The stator according to claim 8, wherein the end face side mating portion is formed by mating the yoke groove and the second plate portion.

11. A guide groove is provided on the fourth surface of the second plate portion, along the direction in which the second plate portion extends. The stator according to claim 7, wherein the winding extends toward the terminal portion so as to pass through the guide groove at one end.

12. The stator according to any one of claims 1 to 3, wherein the outer circumferential surface of the yoke and the first surface of the plate portion are joined together.

13. The outer circumferential surface of the yoke has a first outer circumferential surface, a second outer circumferential surface located inward from the first outer circumferential surface in the radial direction, and a stepped surface connecting the first outer circumferential surface and the second outer circumferential surface. The stator according to any one of claims 1 to 3, wherein the terminal plate is provided on the stepped surface.

14. The outer circumferential surface of the yoke is provided with a recess that overlaps the terminal portion in the direction in which the terminal portion extends. The stator according to any one of claims 1 to 3, wherein the terminal portion is spaced apart from the bottom surface of the recess in the direction in which the terminal portion extends.

15. The stator according to any one of claims 1 to 3, wherein the terminal portion does not penetrate between the first surface and the second surface of the plate portion.

16. The stator according to any one of claims 1 to 3, wherein the terminal portion penetrates between the first surface and the second surface of the plate portion.

17. The stator according to claim 16, wherein the bottom of the terminal portion has a shape that is wider than the portion other than the bottom portion in a direction perpendicular to the direction in which the terminal portion extends.

18. The stator according to claim 16, wherein the bottom of the terminal portion is spaced apart from the outer circumferential surface of the yoke in the direction in which the terminal portion extends.

19. The stator according to any one of claims 1 to 3, wherein the terminal plate is provided along the boundary between the outer circumferential surface of the yoke and the end face of the yoke in the axial direction of the stator core.

20. Multiple coil units are arranged in a ring shape in the circumferential direction, The stator according to any one of claims 1 to 3, wherein each of the plurality of coil units independently comprises a divided core formed by dividing the stator core in the circumferential direction, the coil, and the terminal plate.

21. The stator according to any one of claims 1 to 3, wherein the stator core is composed of a compacted magnetic core.

22. The stator according to any one of claims 1 to 3, wherein the terminal portion is made of a conductive material.

23. A stator according to any one of claims 1 to 3, A motor characterized by comprising a rotor provided opposite the inner circumferential surface of the stator.

24. The motor according to claim 23, further comprising a connecting board electrically connected to one end of the winding.

25. The motor according to claim 24, wherein the connection board is provided on the outer surface of the yoke so as to face the terminal plate.

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