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

Stator and motor

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

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

[0003] Japanese Patent Application Laid-Open No. 2008-61408

[0004] The electric motor described in Patent Document 1 uses bus bars to electrically route the coils, and as shown in FIG. 4 and other figures of Patent Document 1, the bus bars to which the coils are connected are fixed to the stator core with screws. However, in the electric motor described in Patent Document 1, the bus bars for electrically routeing the coils are provided above the stator core, which tends to make the electric motor thick. As such, the electric motor described in Patent Document 1 has room for improvement in terms of achieving electrical routing of the coils while suppressing an increase in thickness.

[0005] The present invention has been made to solve the above problems, and has an object to provide a stator that can realize electrical conduction of the coil while suppressing an increase in thickness, and a motor having the above stator.

[0006] The stator of the present invention has a circumferentially extending annular yoke and teeth protruding radially from the inner surface of the yoke, and is also equipped with a stator core made of a molded body of magnetic powder, a coil made of windings wound around the teeth, and a terminal plate provided on the outer 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, and the plate portion has, in the radial direction, a first surface located on the outer surface side of the yoke and a second surface located opposite the outer surface of the yoke, the terminal portion protruding from at least the second surface of the plate portion, and one end of the winding is fixed in a wound state around the terminal portion.

[0007] A motor according to the present invention is characterized by comprising the stator according to the present invention and a rotor provided opposite to the inner peripheral surface of the stator.

[0008] According to the present invention, it is possible to provide a stator that can realize electrical lead-out of the coil while suppressing an increase in thickness, and also to provide a motor having the above stator.

[0009] FIG. 1 is a schematic perspective view showing an example of a stator according to a first embodiment of the present invention. FIG. 2 is a schematic perspective view showing the coil unit in FIG. 1 as viewed from the inside in the radial direction. FIG. 3 is a schematic perspective view showing the coil unit in FIG. 1 as viewed from the outside in the radial direction. FIG. 4 is a schematic perspective view showing the split core in FIG. 2. FIG. 5 is a schematic perspective view showing the split core and terminal plate in FIG. 3 in an exploded state. FIG. 6 is a schematic perspective view showing the terminal plate in FIG. 5 in an exploded state. FIG. 7 is a schematic perspective view showing a coil unit constituting an example of a stator according to a modified embodiment of the first embodiment of the present invention. FIG. 8 is a schematic perspective view showing the split core and terminal plate in FIG. 7 in an exploded state. FIG. 9 is a schematic perspective view showing a coil unit constituting an example of a stator according to a second embodiment of the present invention. FIG. 10 is a schematic perspective view showing the split core and terminal plate in FIG. 9 in an exploded state. FIG. 11 is a schematic cross-sectional view showing an example of a cross section along line a1-a2 of the coil unit (excluding the winding) shown in FIG. 9 . FIG. 12 is a schematic perspective view showing a coil unit constituting an example of a stator according to a third embodiment of the present invention. FIG. 13 is a schematic perspective view showing a state in which the split cores and terminal plate in FIG. 12 are disassembled. FIG. 14 is a schematic perspective view showing the terminal plate in FIG. 13 as viewed from the radial inside. FIG. 15 is a schematic perspective view showing a coil unit constituting an example of a stator according to a modified embodiment of the third embodiment of the present invention. FIG. 16 is a schematic perspective view showing a state in which the split cores and terminal plate in FIG. 15 are disassembled. FIG. 17 is a schematic perspective view showing a coil unit constituting an example of a stator according to a fourth embodiment of the present invention. FIG. 18 is a schematic perspective view showing a state in which the split cores and terminal plate in FIG. 17 are disassembled. FIG. 19 is a schematic perspective view showing a coil unit constituting an example of a stator according to a fifth embodiment of the present invention. Fig. 20 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 19 are disassembled. Fig. 21 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 6 of the present invention. Fig. 22 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 21 are disassembled. Fig. 23 is a schematic cross-sectional view showing an example of a cross section along line b1-b2 of the coil unit (excluding the windings) shown in Fig. 21.FIG. 24 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 7 of the present invention. FIG. 25 is a schematic perspective view showing a state in which the split cores and terminal plates in FIG. 24 are disassembled. FIG. 26 is a schematic cross-sectional view showing an example of a cross section of the coil unit (excluding the windings) shown in FIG. 24 taken along line c1-c2. FIG. 27 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 8 of the present invention. FIG. 28 is a schematic perspective view showing a state in which the split cores and terminal plates in FIG. 27 are disassembled. FIG. 29 is a schematic cross-sectional view showing an example of a cross section of the coil unit (excluding the windings) taken along line d1-d2. FIG. 30 is a schematic perspective view showing an example of a stator according to embodiment 9 of the present invention. FIG. 31 is a schematic perspective view showing the coil unit in FIG. 30. FIG. 32 is a schematic perspective view showing an example of a motor according to embodiment 10 of the present invention. FIG. 33 is a schematic perspective view showing an example of a motor according to embodiment 11 of the present invention.

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

[0011] The following embodiments are merely examples, and it goes without saying that partial substitution or combination of the configurations shown in different embodiments is possible. From embodiment 2 onwards, descriptions of matters common to embodiment 1 will be omitted, and differences will be mainly described. In particular, similar effects resulting from similar configurations will not be mentioned one after the other for each embodiment.

[0012] In the following description, when there is no need to particularly distinguish between the embodiments, they 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 diagrams, and the dimensions, aspect ratio, scale, etc. may differ from those of the actual product.

[0014] In this specification, terms indicating the relationship between elements (e.g., "parallel," "orthogonal," etc.) and terms indicating the shape of elements not only mean the literal strict form, but also mean a range that is substantially equivalent, for example, a range that includes a difference of about a few percent.

[0015] [Stator] The stator of the present invention comprises a stator core having a circumferentially annular yoke and teeth protruding radially from the inner peripheral surface of the yoke, the stator core being composed of a molded body of magnetic powder, a coil composed of windings wound around the teeth, and a terminal plate provided on the outer peripheral surface of the yoke in the radial direction, the terminal plate having a plate portion and a terminal portion fixed to the plate portion, the plate portion having a first surface located on the outer peripheral surface side of the yoke in the radial direction and a second surface located opposite the outer peripheral surface of the yoke, the terminal portion protruding from at least the second surface of the plate portion, and one end of the winding being fixed in a state of being wound around the terminal portion.

[0016] <Embodiment 1> In the stator of the present invention, the outer peripheral surface of the yoke and the first surface of the plate portion may be joined by an outer peripheral surface-side joining portion. In this case, in the stator of the present invention, the outer peripheral surface-side joining portion may be formed by joining a convex portion protruding from one of the outer peripheral surface of the yoke and the first surface of the plate portion and a concave portion recessed from the other of the outer peripheral surface of the yoke and the first surface of the plate portion. A stator of this type will be described below as a stator of embodiment 1 of the present invention.

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

[0018] The stator 20A shown in FIG. 1 includes a stator core 30A, a plurality of coils 40A, and a plurality of terminal plates 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 peripheral surface of the yoke as viewed from the axial direction is defined as the circumferential direction. Furthermore, the direction perpendicular to the axial direction and in which the outer peripheral surface and inner peripheral surface of the yoke face each other is defined as the radial direction.

[0021] The yoke 31 is annular and extends in the circumferential direction.

[0022] The teeth 32 are spaced apart from one another in the circumferential direction and independently protrude from the inner peripheral surface of the yoke 31 in the radial direction of the yoke 31. In this manner, the teeth 32 are integrated with the yoke 31.

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

[0024] In the stator of the present invention, the stator core is preferably made of a powder magnetic core.

[0025] In the stator 20A, the stator core 30A is preferably made of a powder magnetic core, that is, the yoke 31 and the teeth 32 of the stator core 30A are preferably integrally made of a powder magnetic core.

[0026] The stator core 30A may be configured not only as a powder magnetic core but also as a compact of a composite material containing magnetic powder and resin.

[0027] Each of the plurality of coils 40A is formed by a winding 41 wound around a tooth 32. The plurality of coils 40A are independently provided 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 via, for example, an insulating member to be described later.

[0029] For example, in the case of a three-phase motor, the multiple coils 40A include a coil formed by a U-phase winding, a coil formed by a V-phase winding, and a coil formed by 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 connection or a delta connection.

[0030] The winding wire 41 may be, for example, polyurethane copper wire (UEW).

[0031] The plurality of terminal plates 50A are each provided on the outer peripheral surface 31a of the yoke 31 in the radial direction.

[0032] In the stator 20A, the terminal board 50A is provided on the outer peripheral surface 31a of the yoke 31, so that even when the terminal board 50A is provided, an increase in the thickness of the stator 20A, more specifically, an 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 a first surface 51a located on the outer peripheral surface 31a side of the yoke 31 in the radial direction, and a second surface 51b located on the opposite side to the outer peripheral surface 31a of the yoke 31.

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

[0036] Examples of insulating materials that can be used to form the plate portion 51 include resins such as polyphenylene sulfide (PPS).

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

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

[0039] The direction in which the terminal portions 52 a and 52 b extend is preferably perpendicular to the axial direction, but may be either the radial direction or a direction different from the radial direction.

[0040] The terminal portion 52a and the terminal portion 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, the terminals 52a and 52b are preferably made of a conductive material. In this case, one end 41a of the winding 41 can be easily connected to a terminal of a wiring board (described later) via the terminal 52a. Also, the other end 41b of the winding 41 can be easily connected to a terminal of a wiring board (described later) via the terminal 52b.

[0043] Examples of conductive materials that form the 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, there is no need to consider the insulation between the terminal portions 52a and the stator core 30A, and further, the insulation between the terminal portions 52b and the stator core 30A, so the terminal portions 52a and 52b can be easily fixed to the plate portion 51. Furthermore, by molding the terminal portions 52a and 52b integrally with the plate portion 51, the terminal plate 50A can be easily manufactured.

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

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

[0047] The three-dimensional shape of the terminal portion 52a and the terminal portion 52b may be, for example, a cylindrical shape or a rectangular pillar shape.

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

[0049] As described above, terminal board 50A is provided on outer peripheral surface 31 a of yoke 31. That is, terminal board 50A is provided on outer peripheral surface 31 a of yoke 31 so that first surface 51 a of plate portion 51 faces outer peripheral surface 31 a of yoke 31.

[0050] Terminal board 50A is preferably provided on outer peripheral surface 31a of yoke 31 via an insulating member (not shown). That is, an insulating member is preferably interposed between outer peripheral surface 31a of yoke 31 and first surface 51a of plate portion 51. In this case, insulation between yoke 31 and terminal board 50A, particularly insulation between yoke 31 and terminal portion 52a and insulation between yoke 31 and terminal portion 52b, is ensured.

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

[0052] When the outer peripheral surface 31 a 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. Note that when the outer peripheral surface 31 a of the yoke 31 is covered with an insulating film, the entire surface of the stator core 30A does not have to be covered with an insulating film.

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

[0054] Methods for coating 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 include, for example, a method of applying an insulating material to the target surfaces using a coating method such as electrocoating.

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

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

[0057] One end 41a of the winding 41 is wound around and fixed to the terminal portion 52a, so that the one end 41a of the winding 41 is led out to the terminal plate 50A.

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

[0059] The other end 41b of the winding 41 is preferably fixed in a state where it is wound around the terminal portion 52b, and in this case, the other end 41b of the winding 41 is led out to the terminal plate 50A.

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

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

[0062] In the stator 20A, as shown in FIG. 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 wound around the terminal portion 52a, and the other end 41b of the winding 41 is fixed in a state where it is wound around the terminal portion 52b.

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

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

[0065] Furthermore, in the stator 20A, the terminal board 50A is provided on the outer peripheral surface 31a of the yoke 31, so even when the terminal board 50A is provided, an increase in the thickness of the stator 20A, more specifically, an increase in the axial dimension of the stator 20A, is suppressed.

[0066] Therefore, according to the stator 20A, it is possible to suppress an increase in thickness while achieving electrical lead-out of the coil 40A.

[0067] During the manufacture of the stator 20A, as will be described later, the terminal plate 50A is provided on the outer peripheral surface 31 a of the yoke 31, so there is no need to perform additional processing on the formed stator core 30A, thereby suppressing a decrease in the manufacturing efficiency of the stator 20A.

[0068] During the manufacture of the stator 20A, as will be described later, there is no need to perform additional processing on the formed stator core 30A because the terminal plate 50A is provided on the outer peripheral surface 31a of the yoke 31. Therefore, during the manufacture of the stator 20A, no damage is inflicted on the stator core 30A, and as a result, a decrease in the strength of the stator 20A (more specifically, the stator core 30A) is suppressed.

[0069] Furthermore, in the stator 20A, the terminal board 50A is mounted on the outer peripheral surface 31a of the yoke 31, so the provision of the terminal board 50A does not reduce the space factor of the coil 40A (winding 41), thereby ensuring the power density of the motor incorporating the stator 20A.

[0070] In the stator of the present invention, the terminal plate is preferably provided along a boundary between the outer peripheral surface of the yoke and an end face of the yoke in the axial direction of the stator core.

[0071] In the stator 20A, the terminal plate 50A is preferably provided along the boundary between the outer peripheral surface 31a of the yoke 31 and the end surface 31b of the yoke 31 in the axial direction of the stator core 30A. In this case, the terminal portions 52a and 52b are easily brought close to the main body of the coil 40A, facilitating electrical derivation of the coil 40A.

[0072] In the following, a stator having a plurality of coil units arranged in a ring shape in the circumferential direction will be taken as an example of a stator of the present invention, and the manner in which the terminal plates are installed on the outer peripheral 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 a ring shape in the circumferential direction, and each of the plurality of coil units may independently have a split core formed by dividing the stator core in the circumferential direction, the coil, and the terminal plate.

[0074] The stator 20A shown in FIG. 1 is formed by arranging a plurality of coil units 70A in an annular shape in the circumferential direction.

[0075] Fig. 2 is a schematic perspective view of the coil unit in Fig. 1 as viewed from the inside in the radial direction. Fig. 3 is a schematic perspective view of the coil unit in Fig. 1 as viewed from the outside in the radial direction. Fig. 4 is a schematic perspective view of the split core in Fig. 2. Fig. 5 is a schematic perspective view of the split core and terminal plate in Fig. 3 in an exploded state. Fig. 6 is a schematic perspective view of the terminal plate in Fig. 5 in an exploded state. Note that in Fig. 5, coils are not shown to make the structures of the split core and terminal plate easier to understand. For the same reason, coils are not shown in the subsequent drawings showing the split core and terminal plate in an exploded state.

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

[0077] The split cores 80A are formed by dividing the stator core 30A in the circumferential direction. In other words, the stator core 30A is formed by arranging a plurality of split cores 80A in an annular shape in the circumferential direction.

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

[0079] The split yoke 81 is formed by splitting the yoke 31 in the circumferential direction.

[0080] The teeth 32 protrude in the radial direction from the inner peripheral surface of the split yoke 81. In this manner, the teeth 32 are integrated with the split yoke 81.

[0081] The split core 80A is made of a molded body of magnetic powder. That is, the split yoke 81 and the teeth 32 of the split core 80A are integrally made of a molded body of magnetic powder.

[0082] When viewed from the axial direction, the outer periphery of the split core 80A along the circumferential direction, i.e., the outer periphery of the split yoke 81 along the circumferential direction, may be, for example, curved, linear, or a shape that combines curved and linear shapes. The mode in which the split yokes 81 whose outer peripheries when viewed from the axial direction have the above-described shapes are arranged in the circumferential direction is included in the mode in which the yoke 31 is annular along the circumferential direction.

[0083] In the split core 80A, it is preferable that the teeth 32 are narrower in at least one of the axial and circumferential directions on the split yoke 81 side than on the opposite side of the split yoke 81. In the example shown in Fig. 4, the teeth 32 are narrower in the circumferential direction on the split yoke 81 side than on the opposite side of the split yoke 81.

[0084] In other words, in a stator core 30A in which multiple split cores 80A are arranged in a ring 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 of the axial and circumferential directions.

[0085] If the yoke 31 side of the teeth 32 (the split yoke 81 side) is thinner than the opposite side of the yoke 31 (the opposite side of the split yoke 81), the thinner part can be used as the winding axis of the coil 40A, thereby increasing the number of turns of the coil 40A. As a result, in a motor incorporating the stator 20A, the magnetic flux penetrating the coil 40A tends to increase, which tends to improve the output torque of the motor.

[0086] The coil 40A is provided on the teeth 32 of the split core 80A.

[0087] The terminal plate 50A is fixed to the outer peripheral surface 81a of the split yoke 81 of the split core 80A in the radial direction.

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

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

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

[0091] At least one of the terminal portion 52a and the 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 the terminal portion 52b may protrude from the first surface 51a of the plate portion 51 toward the side opposite to the second surface 51b.

[0092] As shown in FIG. 5, the split yoke 81 of the split core 80A is provided with a recess 86a recessed from the outer circumferential surface 81a.

[0093] The recesses 86a are provided on the periphery of the outer peripheral surface 81a of the split yoke 81. More specifically, the recesses 86a are provided from the outer peripheral surface 81a of the split yoke 81 to the end surfaces 81b of the split yoke 81 in the axial direction.

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

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

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

[0097] The three-dimensional shape of the protrusion 55a is not limited to the form shown in FIGS.

[0098] In the coil unit 70A, the outer peripheral surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 are mated at an outer peripheral mating portion 90A, as shown in Fig. 5. The outer peripheral mating portion 90A is formed by mating the recessed portion 86a and the protruding portion 55a. In other words, in the coil unit 70A, the terminal plate 50A is fixed to the outer peripheral surface 81a of the split yoke 81 by mating the recessed portion 86a and the protruding portion 55a.

[0099] As described above, in the coil unit 70A, the outer surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 are joined at the outer surface side joining portion 90A, making it easier to fix the terminal plate 50A to the outer surface 81a of the split yoke 81 and facilitating positioning of the terminal plate 50A in the axial and circumferential directions.

[0100] In the split core 80A, the recesses 86a are formed in the outer peripheral surface 81a of the split yoke 81, but the recesses 86a are formed simultaneously with the molding of the split core 80A. In other words, when manufacturing the coil unit 70A, there is no need to perform additional processing on the molded split core 80A to provide the recesses 86a in the outer peripheral surface 81a of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70A.

[0101] Furthermore, when manufacturing the coil unit 70A, the split core 80A is not damaged when forming the recess 86a on the outer surface 81a of the split yoke 81, so the reduction in strength of the coil unit 70A (more specifically, the split core 80A) is suppressed.

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

[0103] In contrast, when the busbars are fixed to the stator core with screws, as in the electric motor described in Patent Document 1, additional processing is required to form threaded holes in the stator core after the stator core is manufactured, which reduces manufacturing efficiency. Furthermore, the stator core is damaged when the threaded holes are formed, which reduces the strength of the stator core. Note that, for example, when the stator core is made of a powder magnetic core, it is difficult to form threaded holes in the stator core because the powder magnetic core is brittle.

[0104] The recesses 86a provided on the outer peripheral surface 81a of the split yoke 81 function when mating the first surface 51a of the plate portion 51 with the outer peripheral surface 81a of the split yoke 81, even if they are shallower than the screw holes described in Patent Document 1, for example. Therefore, in the coil unit 70A, even if the recesses 86a are provided on the outer peripheral surface 81a of the split yoke 81, the effect on the magnetic characteristics is minimized. Therefore, in the stator 20A in which multiple coil units 70A are arranged in a ring shape in the circumferential direction, the effect on the magnetic characteristics is minimized even if the recesses 86a are provided.

[0105] 2 and 3, in the coil unit 70A, it is preferable that the outer end of the terminal plate 50A is not positioned axially outward from the outer end of the split yoke 81. In this case, even in the state where the terminal plate 50A is provided, an increase in the thickness of the coil unit 70A is sufficiently suppressed.

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

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

[0108] In the stator of the present invention, the outer peripheral surface side mating portion that mating the outer peripheral surface of the yoke and the first surface of the plate portion is not limited to the embodiment shown in Fig. 5. Other embodiments of the outer peripheral surface side mating portion that mating the outer peripheral surface of the yoke and the first surface of the plate portion will be described below.

[0109] <Modification of Embodiment 1> Fig. 7 is a schematic perspective view showing a coil unit constituting an example of a stator according to a modification of Embodiment 1 of the present invention. Fig. 8 is a schematic perspective view showing a state in which the split cores and the terminal plate in Fig. 7 are disassembled.

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

[0111] As shown in FIG. 8, the split yoke 81 of the split core 80B is provided with a recess 86b recessed from the outer circumferential surface 81a.

[0112] The recess 86b is provided on the outer peripheral surface 81a of the split yoke 81 along the axial direction.

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

[0114] The contour of the recess 86b when viewed from the axial direction may be, for example, curved, linear, or a combination of curved and linear 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 FIG. 8, the plate portion 51 of the terminal board 50B is provided with a protrusion 55b that protrudes from the first surface 51a.

[0116] The protrusion 55b is provided along the axial direction on the first surface 51a of the plate portion 51. More specifically, the protrusion 55b is provided from one end to the other end in the axial direction of the first surface 51a of the plate portion 51 so as to have a shape that follows the recess 86b.

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

[0118] 8, in the coil unit 70B, the outer peripheral surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 are mated at an outer peripheral mating portion 90B. The outer peripheral mating portion 90B is formed by mating the recessed portion 86b and the protruding portion 55b. In other words, in the coil unit 70B, the terminal plate 50B is fixed to the outer peripheral surface 81a of the split yoke 81 by mating the recessed portion 86b and the protruding portion 55b.

[0119] As described above, in the coil unit 70B, the outer peripheral surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 are joined at the outer peripheral surface side joining portion 90B, making it easier to fix the terminal plate 50B to the outer peripheral surface 81a of the split yoke 81 and facilitating circumferential positioning of the terminal plate 50B.

[0120] In the split core 80B, a recess 86b is provided in the outer peripheral surface 81a of the split yoke 81, but the recess 86b is formed simultaneously with the molding of the split core 80B. In other words, when manufacturing the coil unit 70B, there is no need to perform additional processing on the molded split core 80B to provide the recess 86b in the outer peripheral surface 81a of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70B and also prevents a decrease in the strength of the coil unit 70B (more specifically, the split core 80B).

[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 (split yoke) and the first surface of the plate portion may be a configuration other than that of the above-mentioned embodiment 1 and the modified example of embodiment 1.

[0122] For example, the outer surface side mating portion may have a configuration such as that shown in Figures 5 and 8, i.e., a configuration in which a recess recessed from the outer surface of the split yoke and a protrusion protruding from the first surface of the plate portion are mated, or a configuration in which a protrusion protruding from the outer surface of the split yoke and a recess recessed from the first surface of the plate portion are mated.

[0123] The position of the outer peripheral surface side engagement portion is not limited to the embodiment shown in FIGS.

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

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

[0126] The outer peripheral surface mating portion does not have to be present. In other words, the outer peripheral surface of the yoke (split yoke) and the first surface of the plate portion do not have to be mated. In this case, for example, the outer peripheral surface of the yoke (split yoke) and the first surface of the plate portion may be joined as described below.

[0127] <Embodiment 2> In the stator of the present invention, the outer peripheral surface side mating portion may overlap the terminal portion in the extension direction of the terminal portion. 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 extension direction of the terminal portion, and the concave portion is provided so as to be recessed from the outer peripheral surface of the yoke in the extension direction of the terminal portion. A stator different from the stator of embodiment 1 of the present invention in this respect will be described below as a stator of embodiment 2 of the present invention.

[0128] Fig. 9 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 2 of the present invention. Fig. 10 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 9 are disassembled. Fig. 11 is a schematic cross-sectional view showing an example of a cross section along line a1-a2 of the coil unit (excluding the windings) shown in Fig. 9.

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

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

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

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

[0133] The three-dimensional shapes of the recess 86c and the recess 86d may be the same as each other or may be different from each other.

[0134] 10 , plate portion 51 of terminal board 50C is provided with protrusions 55c protruding from first surface 51a in the direction in which terminal portions 52a extend. Furthermore, plate portion 51 of terminal board 50C is provided with protrusions 55d protruding from first surface 51a in the direction in which terminal portions 52b extend.

[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 shapes shown in FIG.

[0139] The three-dimensional shapes of the protrusions 55c and 55d may be the same as or different from each other.

[0140] 10 , in coil unit 70C, outer peripheral surface 81a of split yoke 81 and first surface 51a of plate portion 51 are mated at outer peripheral surface-side mating portion 90C. Outer peripheral surface-side mating portion 90C includes outer peripheral surface-side mating portion 90ca formed by mating recess 86c with protrusion 55c, and outer peripheral surface-side mating portion 90cb formed by mating recess 86d with protrusion 55d. In other words, in coil unit 70C, terminal plate 50C is fixed to outer peripheral surface 81a of split yoke 81 by mating recess 86c with protrusion 55c and mating recess 86d with protrusion 55d.

[0141] In the outer peripheral surface side mating portion 90C, the recess 86c and the protrusion 55c overlap in the direction in which the terminal portion 52a extends at the outer peripheral surface side mating portion 90ca. Furthermore, in the outer peripheral surface side mating portion 90C, the recess 86d and the protrusion 55d overlap in the direction in which the terminal portion 52b extends at the outer peripheral surface side mating portion 90cb. Meanwhile, as described above, in the terminal board 50C, the protrusion 55c and the terminal portion 52a overlap in the direction in which the terminal portion 52a extends. Furthermore, in the terminal board 50C, the protrusion 55d and the terminal portion 52b overlap in the direction in which the terminal portion 52b extends. Therefore, with regard to the positional relationship between the outer peripheral surface side mating portion 90C and the terminal board 50C, the outer peripheral surface side mating portion 90ca overlaps the terminal portion 52a in the direction in which the terminal portion 52a extends. Furthermore, the outer peripheral surface side 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 split yoke 81 and the first surface 51a of the plate portion 51 are joined at the outer peripheral surface side joining portion 90C, making it easier to fix the terminal plate 50C to the outer peripheral surface 81a of the split yoke 81 and facilitating positioning of the terminal plate 50C.

[0143] In this way, in the coil unit 70C, by using only two outer surface side mating portions, the outer surface side mating portion 90ca and the outer surface side mating portion 90cb, the terminal board 50C can be fixed to the outer surface 81a of the split yoke 81, making it possible to position the terminal board 50C.

[0144] In the split core 80C, the recesses 86c and 86d are formed in the outer peripheral surface 81a of the split yoke 81, but the recesses 86c and 86d are formed simultaneously with the molding of the split core 80C. In other words, when manufacturing the coil unit 70C, there is no need to perform additional processing on the molded split core 80C to provide the recesses 86c and 86d in the outer peripheral surface 81a of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70C and further prevents a decrease in the strength of the coil unit 70C (more specifically, the split core 80C).

[0145] Furthermore, in terminal strip 50C, protrusion 55c is provided at a position overlapping terminal portion 52a in the direction in which terminal portion 52a extends, and therefore, compared to a case in which protrusion 55c is not provided, it is possible to increase the dimension of terminal portion 52a embedded in plate portion 51 in the direction in which terminal portion 52a extends, as shown in Fig. 11. As a result, in terminal strip 50C, terminal portion 52a is firmly fixed to plate portion 51. Terminal portion 52a firmly fixed to plate portion 51 is less likely to wobble, which improves the efficiency of the work when winding one end 41a of winding wire 41 to terminal portion 52a.

[0146] Although Figure 11 shows a cross section of the coil unit 70C at the position where the terminal portion 52a and the protrusion portion 55c overlap, it is preferable that the cross section of the position where the terminal portion 52b and the protrusion portion 55d overlap is also similar to that shown 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 peripheral surface of the yoke and a second plate portion extending from a part of the first plate portion so as to face an end face of the yoke in the axial direction of the stator core. The first plate portion may have the first surface and the 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 from 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 joined by an end face side mating portion. Furthermore, in this case, in the stator of the present invention, the end face side mating portion may be formed by a protrusion protruding from one of the end face of the yoke and the third surface of the second plate portion and a recess recessed from the other of the end face of the yoke and the third surface of the second plate portion. A stator that differs from the stator of the first embodiment of the present invention in this respect will be described below as a stator of the third embodiment of the present invention.

[0148] Fig. 12 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 3 of the present invention. Fig. 13 is a schematic perspective view showing a state in which the split cores and terminal plate in Fig. 12 are disassembled. Fig. 14 is a schematic perspective view showing the terminal plate in Fig. 13 as viewed from the radial inside.

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

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

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

[0152] As shown in FIGS. 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 51 p faces the outer peripheral surface 81 a of the split 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 surface 81b of the split yoke 81.

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

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

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

[0159] The three-dimensional shape of the protrusion 55e is not limited to the form shown in FIGS.

[0160] 13, in coil unit 70D, end face 81b of split yoke 81 and third face 51c of second plate portion 51q are joined at end face-side joint 91A. End face-side joint 91A is formed by mating recess 86e and protrusion 55e. In other words, in coil unit 70D, by mating recess 86e and protrusion 55e, terminal board 50D is fixed to end face 81b of split yoke 81 and is provided on outer peripheral surface 81a of split yoke 81.

[0161] As described above, in the coil unit 70D, the end face 81b of the split yoke 81 and the third face 51c of the second plate portion 51q are joined at the end face side joining portion 91A, making it easier to fix the terminal plate 50D to the end face 81b of the split yoke 81 and facilitating positioning of the terminal plate 50D in the axial direction.

[0162] In the split core 80D, a recess 86e is provided in the end surface 81b of the split yoke 81, but the recess 86e is formed simultaneously with the molding of the split core 80D. In other words, when manufacturing the coil unit 70D, there is no need to perform additional processing on the molded split core 80D to provide the recess 86e in the end surface 81b of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70D and also prevents a decrease in the strength of the coil unit 70D (more specifically, the split core 80D).

[0163] In the coil unit 70D, the second plate portion 51q is provided on the end surface 81b of the split yoke 81, which may increase the thickness of the coil unit 70D. 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 the thickness of the bus bar described in Patent Document 1, for example. Therefore, the second plate portion 51q has almost no effect on 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 smaller than the diameter of the winding 41 (e.g., 0.3 mm or more and 0.5 mm or less), the effect 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 larger 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 in the axial direction provided in the end surface 81b of the split yoke 81. In this case, the effect 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 entire second plate portion 51q is housed in a recess provided in the end surface 81b of the split yoke 81 in the axial direction. In other words, it is preferable that the entire thickness of the second plate portion 51q is equal to or smaller than 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 in the end surface 81b of the split yoke 81. In other words, the thickness of a portion of the second plate portion 51q may be equal to or smaller than 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 matings the end face of the yoke and the third surface of the second plate portion is not limited to the embodiment shown in Fig. 13. Other embodiments of the end face side mating portion that matings the end face of the yoke and the third surface of the second plate portion will be described below.

[0168] In the stator of the present invention, when the end surface of the yoke and the third surface of the second plate portion are joined at an end surface side joint portion, the end surface of the yoke may be provided with a yoke groove along the direction in which the second plate portion extends, and the end surface side joint portion may be formed by the yoke groove and the second plate portion being joined together. A stator that differs from the stator of the third embodiment of the present invention in this respect will be described below as a stator of a modification of the third embodiment of the present invention.

[0169] Fig. 15 is a schematic perspective view showing a coil unit constituting an example of a stator according to a modified example of embodiment 3 of the present invention. Fig. 16 is a schematic perspective view showing a state in which the split cores and the terminal plates in Fig. 15 are disassembled.

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

[0171] As shown in FIG. 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 51 qa extends from a part of the first plate portion 51 p so as to face the end surface 81 b of the split yoke 81 .

[0173] The second plate portion 51qb extends from a part of the first plate portion 51p so as to face the end surface 81b of the split yoke 81 at a position spaced apart from the second plate portion 51qa in the circumferential direction.

[0174] The extending directions of the second plate portion 51qa and the second plate portion 51qb may be the same as each other (may be parallel to each other) or may be different from each other (do not have to be parallel to each other).

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

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

[0177] 16, a yoke groove 89a extending along the direction in which the second plate portion 51qa extends is provided on the end surface 81b of the split yoke 81. Furthermore, a yoke groove 89b extending along the direction in which the second plate portion 51qb extends is provided on the end surface 81b of the split yoke 81.

[0178] The yoke groove 89a is preferably provided from one end to the other end of the end face 81b of the split yoke 81 in the direction in which the second plate portion 51qa extends. Furthermore, the yoke groove 89b is preferably provided from one end to the other end of the end face 81b of the split yoke 81 in the direction in which the second plate portion 51qb extends.

[0179] The three-dimensional shapes of the yoke grooves 89a and 89b are not limited to the shapes shown in FIG.

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

[0181] 16 , in the coil unit 70E, the end face 81b of the split yoke 81 and the third surfaces of the second plate portion 51qa and the second plate portion 51qb are joined by an end face-side mating portion 91B. The end face-side mating portion 91B includes an end face-side mating portion 91ba formed by the yoke groove 89a and the second plate portion 51qa being joined, and an end face-side mating portion 91bb formed by the yoke groove 89b and the second plate portion 51qb being joined. In other words, in the coil unit 70E, the yoke groove 89a and the second plate portion 51qa are joined, and the terminal board 50E is provided on the outer peripheral surface 81a of the split yoke 81 while being fixed to the end face 81b of the split yoke 81.

[0182] As described above, in the coil unit 70E, the end face 81b of the split yoke 81 and the third faces of the second plate portions 51qa and 51qb are joined by the end face side joining portion 91B, making it easier to fix the terminal plate 50E to the end face 81b of the split yoke 81 and facilitating positioning of the terminal plate 50E in the axial direction.

[0183] In the split core 80E, the yoke grooves 89a and 89b are formed in the end surface 81b of the split yoke 81, but the yoke grooves 89a and 89b are formed simultaneously with the molding of the split core 80E. In other words, when manufacturing the coil unit 70E, there is no need to perform additional processing on the molded split core 80E to form the yoke grooves 89a and 89b in the end surface 81b of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70E and further prevents a decrease in the strength of the coil unit 70E (more specifically, the split core 80E).

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

[0185] From this viewpoint, it is preferable that the entire second plate portion 51qa is housed in the yoke groove 89a, and the entire 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 so as to pass through the guide groove at one end side.

[0187] 16, a guide groove 59a is provided on the fourth surface 51da ​​of the second plate portion 51qa along the direction in which the second plate portion 51qa extends, and a guide groove 59b is provided on the fourth surface 51db of the second plate portion 51qb along the direction in which the second plate portion 51qb extends.

[0188] 15, one end 41a of the winding 41 extends toward the terminal 52a so as to pass through the guide groove 59a. In other words, the guide groove 59a is used as a groove for arranging the winding 41 when leading the one end 41a of the winding 41 to the terminal 52a.

[0189] During the manufacturing process of split core 80E, the boundary between outer peripheral surface 81a and end face 81b of split yoke 81 and the boundary between inner peripheral surface and end face 81b of split yoke 81 may become rough and burrs may be formed. Therefore, when one end 41a of winding 41 is led out to terminal portion 52a, if one end 41a of winding 41 is in contact with the boundary between outer peripheral surface 81a and end face 81b of split yoke 81 and the boundary between inner peripheral surface and end face 81b of split yoke 81, the insulating coating of winding 41 may be destroyed by the burrs.

[0190] In contrast, in coil unit 70E, one end 41a of winding 41 extends toward terminal 52a so as to pass through guide groove 59a. As a result, when one end 41a of winding 41 is led out to terminal 52a, one end 41a of winding 41 can avoid the boundary between outer circumferential surface 81a and end face 81b of split yoke 81 and the boundary between inner circumferential surface and end face 81b of split yoke 81, preventing damage to the insulating coating of winding 41.

[0191] 15, the other end 41b of the winding 41 extends toward the terminal 52b through the guide groove 59b. That is, the guide groove 59b is used as a groove for arranging the winding 41 when the other end 41b of the winding 41 is led out to the terminal 52b.

[0192] In the coil unit 70E, the winding 41 extends toward the terminal portion 52b so as to pass through the guide groove 59b on the other end 41b side. Therefore, when the other end 41b of the winding 41 is led out to the terminal portion 52b, the other end 41b side of the winding 41 can avoid the boundary between the outer surface 81a and the end face 81b of the split yoke 81 and the boundary between the inner surface and the end face 81b of the split yoke 81, thereby preventing destruction of 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 engages the end face of the yoke (split yoke) with the third surface of the second plate portion may be a configuration other than that of the above-mentioned embodiment 3 and the modified example of embodiment 3.

[0194] For example, the end face side mating portion may have a configuration such as that shown in Figure 13, i.e., a configuration in which a recess recessed from the end face of the split yoke and a protrusion protruding from the third surface of the second plate portion are mated, or a configuration in which a protrusion protruding from the end face of the split yoke and a recess recessed from the third surface of the second plate portion are mated.

[0195] The position of the end face side mating portion is not limited to the embodiment shown in FIGS.

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

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

[0198] The end face side mating portion does not have to be present. In other words, the end face of the yoke (split 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 (split yoke) and the third surface of the second plate portion may be joined.

[0199] In the stator of the present invention, the outer peripheral surface of the yoke and the first surface of the plate portion may be joined together. A stator that differs from the stator of the first embodiment of the present invention in this respect will be described below as a stator of the fourth embodiment of the present invention.

[0200] Fig. 17 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 4 of the present invention. Fig. 18 is a schematic perspective view showing a state in which the split cores and the terminal plates in Fig. 17 are disassembled.

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

[0202] In coil unit 70F, outer peripheral surface 81 a of split yoke 81 is joined to first surface 51 a of plate portion 51. That is, terminal plate 50F is fixed to outer peripheral surface 81 a of split yoke 81 at a joint (not shown).

[0203] The joining portion may be made of, for example, an adhesive.

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

[0205] In this way, unlike coil unit 70A, etc., coil unit 70F has a simple structure that does not use a mating portion, as shown in Figure 18, which allows terminal board 50F to be fixed to the outer surface 81a of split yoke 81, making it possible to position terminal board 50F.

[0206] In addition, even in an embodiment in which the terminal plate is fixed to the outer surface of the split yoke using the outer surface side mating portion, such as coil unit 70A, the outer surface of the split yoke and the first surface of the plate portion may be joined in addition to being mated.

[0207] Also, in an embodiment in which the terminal plate is fixed to the end face of the split yoke using the end face side mating portion, such as coil unit 70D, 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] In the stator of the present invention, the outer peripheral surface of the yoke may have a first outer peripheral surface, a second outer peripheral surface located radially inward from the first outer peripheral surface, and a stepped surface connecting the first outer peripheral surface and the second outer peripheral surface, and the terminal plate may be provided on the stepped surface. A stator that differs from the stator of the first embodiment of the present invention in this respect will be described below as a stator of the fifth embodiment of the present invention.

[0209] Fig. 19 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 5 of the present invention, and Fig. 20 is a schematic perspective view showing a state in which the split cores and the terminal plates in Fig. 19 are disassembled.

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

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

[0212] As shown in FIG. 20, the outer peripheral surface 81a of the split yoke 81 has a first outer peripheral surface 81aa, a second outer peripheral surface 81ab, and a step surface 81ac.

[0213] The first outer peripheral surface 81aa of the split yoke 81 is located on the opposite side of the end surface 81b in the axial direction from the second outer peripheral surface 81ab (axially lower in FIG. 20).

[0214] The first outer peripheral surface 81aa of the split yoke 81 may be located closer to the end face 81b in the axial direction than the second outer peripheral surface 81ab (upper in the axial direction in FIG. 20).

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

[0216] The step surface 81ac of the split yoke 81 connects the first outer peripheral surface 81aa and the second outer peripheral surface 81ab.

[0217] 20, the step surface 81ac of the split yoke 81 extends in the circumferential direction. More specifically, the step surface 81ac of the split yoke 81 extends from one end to the other end in the circumferential direction of the outer circumferential surface 81a.

[0218] The step surface 81ac of the split yoke 81 does not have to extend from one end to the other in the circumferential direction of the outer peripheral surface 81a. For example, the step surface 81ac of the split yoke 81 may be provided on a part of a path extending from one end to the other in the circumferential direction of the outer peripheral surface 81a.

[0219] As shown in FIG. 19, in a coil unit 70G, a terminal board 50F is provided on a step surface 81ac of a split yoke 81.

[0220] In coil unit 70G, terminal board 50F is provided on step surface 81ac of split yoke 81, so that step surface 81ac of split yoke 81 functions as a structure for axially positioning terminal board 50F. That is, in coil unit 70G, step surface 81ac of split yoke 81 makes it easy to position terminal board 50F in the axial direction.

[0221] Furthermore, in the coil unit 70G, the terminal board 50F is provided on the step surface 81ac of the split yoke 81, so that even when the terminal board 50F is provided, an increase in the radial dimension of the coil unit 70G is suppressed.

[0222] From this viewpoint, it is preferable that the entire second surface 51b of the plate portion 51 is not positioned radially outward from the outer end of the step surface 81ac of the split yoke 81. In other words, it is preferable that the entire radial dimension of the plate portion 51 is equal to or smaller than the radial dimension of the step surface 81ac of the split yoke 81.

[0223] In addition, in the radial direction, a part of the second surface 51b of the plate portion 51 does not have to be located outward from the outer end of the step surface 81ac of the split yoke 81. In other words, the radial dimension of the part of the plate portion 51 may be equal to or smaller than the radial dimension of the step surface 81ac of the split yoke 81.

[0224] In coil unit 70G, for example, outer peripheral surfaces 81a of split yoke 81 and first surfaces 51a of plate portions 51 are joined together. Note that in coil unit 70G, outer peripheral surfaces 81a of split yoke 81 and first surfaces 51a of plate portions 51 may be joined together at an outer peripheral surface joining portion, as in coil unit 70A, etc.

[0225] In the stator of the present invention, the outer peripheral surface of the yoke may be provided with a recess that overlaps with the terminal portion in the extension direction of the terminal portion, and the terminal portion may be spaced apart from a bottom surface of the recess in the extension direction of the terminal portion. A stator that differs from the stator of the first embodiment of the present invention in this respect will be described below as a stator of the sixth embodiment of the present invention.

[0226] Fig. 21 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 6 of the present invention. Fig. 22 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 21 are disassembled. Fig. 23 is a schematic cross-sectional view showing an example of a cross section along line b1-b2 of the coil unit (excluding the windings) shown in Fig. 21.

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

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

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

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

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

[0232] In the coil unit 70H, for example, the outer peripheral surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 are joined together. Note that in the coil unit 70H, the outer peripheral surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 may be joined together at an outer peripheral surface joining portion, as in the coil unit 70A, etc.

[0233] In the coil unit 70H, when the terminal board 50F is fixed to the outer peripheral surface 81a of the split yoke 81, the recess 87a overlaps the terminal portion 52a in the direction in which the terminal portion 52a extends, as shown in FIG. 23 . Furthermore, in the coil unit 70H, when the terminal board 50F is fixed to the outer peripheral surface 81a of the split yoke 81, the terminal portion 52a is spaced from the bottom surface of the recess 87a in the direction in which the terminal portion 52a extends, as shown in FIG. 23 . This ensures that the terminal portion 52a does not contact the split yoke 81 when the terminal board 50F is fixed to the outer peripheral surface 81a of the split yoke 81, 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. Therefore, the structure shown in FIG. 23 ensures insulation between the split yoke 81 and the terminal portion 52a. Furthermore, according to the structure shown in Figure 23, when electrically connecting one end 41a of the winding 41 to the terminal of the wiring board as described below, for example, by using solder bonding, the heat generated during the solder bonding is less likely to be transmitted from the terminal portion 52a to the split yoke 81, and as a result, damage to the split core 80H is less likely to occur, thereby suppressing a decrease in the strength of the coil unit 70H (more specifically, the split core 80H).

[0234] In coil unit 70H, with terminal board 50F fixed to outer peripheral surface 81a of split yoke 81, recess 87b overlaps terminal portion 52b in the direction in which terminal portion 52b extends, as in Fig. 23. Furthermore, in coil unit 70H, with terminal board 50F fixed to outer peripheral surface 81a of split yoke 81, terminal portion 52b is spaced apart from the bottom surface of recess 87b in the direction in which terminal portion 52b extends, as in Fig. 23.

[0235] In the coil unit 70H, when the terminal plate 50F is fixed to the outer peripheral surface 81a of the split yoke 81, at least one of the terminal portions 52a and 52b needs to be spaced apart from the bottom surface of the recess in the direction in which the terminal portion extends, or only one of the terminal portions 52a and 52b may be spaced apart from the bottom surface of the recess in the direction in which the terminal portion extends.

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

[0237] In addition, in other coil units such as coil unit 70A (excluding coil unit 70C), a recess may be provided on the outer surface of the split yoke that overlaps with 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] In the stator of the present invention, the terminal portion does not have to penetrate between the first surface and the second surface of the plate portion. A stator that differs from the stator of the first embodiment in this respect will be described below as a stator of the seventh embodiment of the present invention.

[0239] Fig. 24 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 7 of the present invention. Fig. 25 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 24 are disassembled. Fig. 26 is a schematic cross-sectional view showing an example of a cross section along line c1-c2 of the coil unit shown in Fig. 24.

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

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

[0242] In coil unit 70J, for example, outer peripheral surfaces 81a of split yoke 81 and first surfaces 51a of plate portions 51 are joined together. Note that in coil unit 70J, outer peripheral surfaces 81a of split yoke 81 and first surfaces 51a of plate portions 51 may be joined together at an outer peripheral surface joining portion, as in coil unit 70A, etc.

[0243] In coil unit 70J, as shown in FIG. 26 , in terminal board 50J, terminal portion 52a does not penetrate between first surface 51a and second surface 51b of plate portion 51. That is, in terminal board 50J, terminal portion 52a is not exposed from first surface 51a of plate portion 51. This allows for a structure in which terminal board 50J is fixed to outer peripheral surface 81a of split yoke 81 and terminal portion 52a does not come into contact with split yoke 81. Therefore, the structure shown in FIG. 26 ensures insulation between split yoke 81 and terminal portion 52a. Furthermore, according to the structure shown in Figure 26, when electrically connecting one end 41a of the winding 41 to the terminal of the wiring board as described below, for example, by using solder bonding, the heat generated during the solder bonding is less likely to be transmitted from the terminal portion 52a to the split yoke 81, and as a result, damage to the split core 80F is less likely to occur, thereby 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 sufficient 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 terminal board 50J, if terminal portion 52a does not penetrate between the first surface 51a and the second surface 51b of plate portion 51, terminal portion 52b may not penetrate between the first surface 51a and the second surface 51b of plate portion 51, or may penetrate between the first surface 51a and the second surface 51b of plate portion 51.

[0246] In other coil units such as the coil unit 70A, the terminal portion does not have to pass through between the first surface and the second surface 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, in the stator of the present invention, 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, in the stator of the present invention, the bottom of the terminal portion may be spaced apart from the outer peripheral surface of the yoke in the direction in which the terminal portion extends. A stator that differs from the stator of embodiment 1 of the present invention in this respect will be described below as a stator of embodiment 8 of the present invention.

[0248] Fig. 27 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 8 of the present invention. Fig. 28 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 27 are disassembled. Fig. 29 is a schematic cross-sectional view showing an example of a cross section along line segment d1-d2 of the coil unit shown in Fig. 27.

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

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

[0251] In the coil unit 70K, for example, the outer peripheral surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 are joined together. Note that in the coil unit 70K, the outer peripheral surface 81a of the split yoke 81 and the first surface 51a of the plate portion 51 may be joined together at an outer peripheral surface joining portion, as in the coil unit 70A, etc.

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

[0253] 29, in the coil unit 70K, the bottom of the terminal portion 52a of the terminal board 50K has a shape that is wider than the rest of the terminal portion 52a in a direction perpendicular to the direction in which the terminal portion 52a extends (the axial direction in FIG. 29). Because the bottom of the terminal portion 52a has such a wider shape, the terminal portion 52a is less likely to come off the board portion 51.

[0254] In coil unit 70K, as shown in FIG. 29 , in terminal board 50K, the bottom of terminal portion 52a is spaced from outer peripheral surface 81a of split yoke 81 in the direction in which terminal portion 52a extends. That is, a cavity 88 is provided between terminal portion 52a and split yoke 81. This allows for a structure in which terminal portion 52a does not contact split yoke 81 even if terminal portion 52a penetrates between first surface 51a and second surface 51b of plate portion 51, when terminal board 50K is fixed to outer peripheral surface 81a of split yoke 81. Therefore, the structure shown in FIG. 29 ensures insulation between split yoke 81 and terminal portion 52a. Furthermore, according to the structure shown in Figure 29, when electrically connecting one end 41a of the winding 41 to the terminal of the wiring board as described below, for example, by using solder bonding, the heat generated during the solder bonding is less likely to be transmitted from the terminal portion 52a to the split yoke 81, and as a result, damage to the split core 80F is less likely to occur, thereby suppressing a decrease in the strength of the coil unit 70K (more specifically, the split core 80F).

[0255] 29 can be manufactured by, for example, press-fitting terminal portion 52a from the first surface 51a side of plate portion 51. According to such a manufacturing method, terminal portion 52a can be easily fixed to plate portion 51, which tends to improve the manufacturing efficiency of 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 the terminal portion 52b penetrates between the first surface 51a and the second surface 51b of the plate portion 51, and it is also possible that only one of the terminal portion 52a and the terminal portion 52b penetrates between the first surface 51a and the second surface 51b of the plate portion 51.

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

[0258] In terminal board 50K, when terminal portion 52b penetrates between first surface 51a and second surface 51b of plate portion 51, the bottom of terminal portion 52b may have a shape that is wider than the rest of the terminal portion 52b in a direction perpendicular to the extension direction of terminal portion 52b, as in Fig. 29. Furthermore, the bottom of terminal portion 52b may be spaced apart from outer peripheral surface 81a of split yoke 81 in the extension direction of terminal portion 52b, as in Fig. 29.

[0259] In other coil units such as the coil unit 70A, the terminal portion may also pass through between the first surface and the second surface of the plate portion.

[0260] <Embodiment 9> In the above embodiments, the terminal plate has two terminal portions, but in the stator of the present invention, the terminal plate may have only one terminal portion. That is, in the stator of the present invention, only one end of the winding may be fixed in a state where it is wound around the terminal portion. A stator of embodiment 9 of the present invention that differs from the stator of embodiment 4 of the present invention in this respect will be described below as a stator of embodiment 9 of the present invention.

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

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

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

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

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

[0266] One end 41a of the winding 41 is wound around and fixed to the terminal portion 52a, so that the one end 41a of the winding 41 is led out to the terminal plate 50L.

[0267] In the stator 20L, the coil unit 70L is used, for example, when connecting the windings 41 of multiple coils 40A in series. In this case, as shown in FIG. 30 , the stator 20L may further include, in addition to the coil unit 70L, a coil unit 71L in which both ends of the winding 41 are not led out to a terminal plate. That is, the stator 20L may include a mixture of coil units 70L in which one end 41 a of the winding 41 is led out to a terminal plate and coil units 71L in which both ends of the winding 41 are not led out to a terminal plate. In this case, there is no need to provide terminal plates for all coil units, thereby reducing costs associated with terminal plates.

[0268] In other coil units such as the coil unit 70A, the terminal plate may also have only one terminal portion.

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

[0270] In a stator having a split stator core, the coils 40A can be arranged more densely than in a stator having an integrated stator core, and as a result, the number of coils 40A can be increased. Therefore, in a stator having a split stator core, the motor characteristics can be more easily improved than in a stator having an integrated stator core.

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

[0272] [Motor] A motor of the present invention is characterized by including the stator of the present invention and a rotor provided opposite to the inner peripheral surface of the stator.

[0273] Tenth Embodiment An example of a motor according to the present invention will be described below as a motor according to a tenth embodiment of the present invention.

[0274] FIG. 32 is a schematic perspective view showing an example of a motor according to a tenth embodiment of the present invention.

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

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

[0277] The rotor 10A is disposed opposite the inner peripheral 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 made of, for example, a bulk soft magnetic material, an electromagnetic steel sheet, a powder magnetic core, a resin molded body containing a soft magnetic material, or the like.

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

[0281] Examples of materials that can be used to form the shaft 12 include metals such as stainless steel.

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

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

[0284] When viewed in the axial direction, the rotor 10A may have a substantially circular shape or a substantially polygonal shape.

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

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

[0287] FIG. 33 is a schematic perspective view showing an example of a motor according to an eleventh embodiment of the present invention.

[0288] The motor 1B shown in FIG. 33 further includes a wiring board 25A in addition to the rotor 10A and the stator 20A.

[0289] The wiring board 25A is electrically connected to one end 41a of the winding 41 of the coil 40A of the stator 20A. Furthermore, the wiring 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 will be described below.

[0290] The wiring board 25A is provided with a plurality of through holes 26 that penetrate between one main surface and the other main surface and are spaced apart from one another in the circumferential direction.

[0291] In the wiring board 25A, a terminal (not shown) is exposed on the inner wall surface of each through hole 26.

[0292] In motor 1B, wiring board 25A is provided to face terminal board 50A on outer peripheral surface 31a of yoke 31. More specifically, wiring board 25A is wound circumferentially around stator 20A so that terminal portion 52a and terminal portion 52b pass through separate through holes 26. Meanwhile, one end 41a of winding 41 is wound around and fixed to terminal portion 52a, and the other end 41b of winding 41 is wound around and fixed to terminal portion 52b.

[0293] Therefore, in the motor 1B in which the wiring board 25A is wound circumferentially around the stator 20A 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 terminals exposed from the inner wall surfaces of the respective through holes 26. Furthermore, in the motor 1B, the wiring board 25A is disposed opposite the terminal plate 50A on the outer peripheral surface 31a of the yoke 31, thereby suppressing an increase in the thickness of the motor 1B, more specifically, an increase in the axial dimension of the motor 1B. Therefore, in the motor 1B, electrical connection between the one end 41a of the winding 41 and the terminal of the wiring board 25A and between the other end 41b of the winding 41 and the terminal of the wiring board 25A can be easily achieved while suppressing an increase in thickness.

[0294] The wiring board 25A is preferably a board with excellent flexibility, such as a flexible printed circuit board (FPC), since it is used in a state where it is wound around the stator 20A in the circumferential direction.

[0295] The present specification discloses the following:

[0296] <1> A stator comprising: a stator core having an annular yoke extending along a circumferential direction and teeth protruding radially from an inner peripheral surface of the yoke, and the stator core being formed of a molded body of magnetic powder; a coil formed of windings wound around the teeth; and a terminal plate provided on an outer peripheral 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 having, in the radial direction, a first surface located on the outer peripheral surface side of the yoke and a second surface located opposite the outer peripheral surface of the yoke, the terminal portion protruding from at least the second surface of the plate portion, and one end of the winding is fixed in a state of being wound around the terminal portion.

[0297] <2> The stator according to <1>, wherein the outer peripheral surface of the yoke and the first surface of the plate portion are joined together at an outer peripheral surface side joining portion.

[0298] <3> The stator described in <2>, wherein the outer peripheral surface side 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.

[0299] <4> The stator according to <3>, wherein the outer peripheral surface side mating portion overlaps the terminal portion in an extension direction of the terminal portion.

[0300] <5> The stator according to <4>, wherein the convex portion is provided so as to protrude from the first surface of the plate portion in a direction in which the terminal portion extends, and 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.

[0301] <6> The stator according to any one of <1> to <5>, wherein the plate portion has a first plate portion facing the outer peripheral surface of the yoke and a second plate portion extending from a part of the first plate portion so as to face an end face of the yoke in the axial direction of the stator core, the first plate portion having the first surface and the second surface, and the second plate portion having a third surface located on the side of the end face of the yoke and a fourth surface located opposite the end face of the yoke.

[0302] <7> The stator according to <6>, wherein the end surface of the yoke and the third surface of the second plate portion are joined at an end surface side joining portion.

[0303] <8> The stator described in <7>, 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.

[0304] <9> The stator according to <7>, wherein a yoke groove is provided on the end surface of the yoke along the direction in which the second plate portion extends, and the end surface side mating portion is formed by mating the yoke groove and the second plate portion.

[0305] <10> The stator according to any one of <6> to <9>, wherein a guide groove is provided on the fourth surface of the second plate portion along an extending direction of the second plate portion, and one end of the winding extends toward the terminal portion so as to pass through the guide groove.

[0306] <11> The stator according to any one of <1> to <10>, wherein the outer peripheral surface of the yoke and the first surface of the plate portion are joined together.

[0307] <12> The stator according to any one of <1> to <11>, wherein the outer peripheral surface of the yoke has a first outer peripheral surface, a second outer peripheral surface located radially inward of the first outer peripheral surface, and a stepped surface connecting the first outer peripheral surface and the second outer peripheral surface, and the terminal plate is provided on the stepped surface.

[0308] <13> The stator according to any one of <1> to <12>, wherein the outer peripheral surface of the yoke is provided with a recess that overlaps the terminal portion in an extension direction of the terminal portion, and the terminal portion is spaced apart from a bottom surface of the recess in the extension direction of the terminal portion.

[0309] <14> The stator according to any one of <1> to <13>, wherein the terminal portion does not penetrate between the first surface and the second surface of the plate portion.

[0310] <15> The stator according to any one of <1> to <13>, wherein the terminal portion penetrates between the first surface and the second surface of the plate portion.

[0311] <16> The stator according to <15>, wherein the bottom of the terminal portion has 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.

[0312] <17> The stator according to <15> or <16>, wherein the bottom of the terminal portion is spaced apart from the outer circumferential surface of the yoke in the extending direction of the terminal portion.

[0313] <18> The stator according to any one of <1> to <17>, wherein the terminal plate is provided along a boundary between the outer peripheral surface of the yoke and an end face of the yoke in the axial direction of the stator core.

[0314] <19> The stator according to any one of <1> to <18>, wherein a plurality of coil units are arranged in an annular shape in the circumferential direction, and each of the plurality of coil units independently has a split core formed by splitting the stator core in the circumferential direction, the coil, and the terminal plate.

[0315] <20> The stator according to any one of <1> to <19>, wherein the stator core is made of a powder magnetic core.

[0316] <21> The stator according to any one of <1> to <20>, wherein the terminal portion is made of a conductive material.

[0317] <22> A motor comprising: the stator according to any one of <1> to <21>; and a rotor provided opposite to an inner peripheral surface of the stator.

[0318] <23> The motor according to <22>, further comprising a wiring board electrically connected to one end of the winding.

[0319] <24> The motor according to <23>, wherein the wiring board is provided so as to face the terminal plate on the outer peripheral surface of the yoke.

[0320] DESCRIPTION OF SYMBOLS 1A, 1B Motor 10A Rotor 11 Rotor yoke 12 Shaft 13 Permanent magnet 20A, 20L Stator 25A Wiring board 26 Through hole 30A Stator core 31 Yoke 31a Outer circumferential surface of yoke 31b End face of yoke 32 Teeth 40A Coil 41 Winding 41a One end of winding 41b Other end of winding 50A, 50B, 50C, 50D, 50E, 50F, 50J, 50K, 50L Terminal board 51 Plate portion 51a First surface of plate portion (first plate portion) 51b Second surface of plate portion (first plate portion) 51c, 51ca, 51cb Third surface of plate portion (second plate portion) 51d, 51da, 51db Fourth surface of plate portion (second plate portion) 51p First plate portion 51q, 51qa, 51qb Second plate portion 52a, 52b Terminal portion 55a, 55b, 55c, 55d, 55e Convex portion of plate portion 59a, 59b Guide groove 70A, 70B, 70C, 70D, 70E, 70F, 70G, 70H, 70J, 70K, 70L, 71L Coil unit 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H Split core 81 Split yoke 81a Outer peripheral surface of split yoke 81aa First outer peripheral surface of split yoke 81ab Second outer peripheral surface of split yoke 81ac Step surface of split yoke 81b End surface of split yoke 86a, 86b, 86c, 86d, 86e: Recesses of divided yoke 87a, 87b: Cavities of divided yoke 88: Cavities 89a, 89b: Yoke grooves 90A, 90B, 90C, 90ca, 90cb: Outer circumferential surface side mating portions 91A, 91B, 91ba, 91bb: End surface side mating portions AX: Axis line

Claims

1. a stator core including a circumferentially annular yoke and teeth protruding from an inner peripheral surface of the yoke in a radial direction of the yoke, the stator core being made of a compact of magnetic powder; A coil formed by a winding wound around the teeth; a terminal plate provided on an outer circumferential surface of the yoke in the radial direction, The yoke has an end surface in an 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 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 to 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 from the inner 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 wound state to the terminal portion.

2. A stator core having an annular yoke extending along a circumferential direction and teeth protruding from an inner peripheral surface of the yoke in a radial direction of the yoke, the stator core being made of a compact of magnetic powder; A coil formed by a winding wound around the teeth; a terminal plate provided on an 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 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 to 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 a wound state to the terminal portion, A stator, characterized in that the outer peripheral surface of the yoke and the first surface of the plate portion are joined at an outer peripheral surface side joining 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 joined together at an outer peripheral surface side joining portion.

4. 4. The stator according to claim 2 or 3, wherein the outer peripheral surface side 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 side mating portion overlaps the terminal portion in a direction in which the terminal portion extends.

6. the protrusion is provided to protrude from the first surface of the plate portion in an extending direction of the terminal portion, The stator according to claim 5 , wherein the recess is recessed from the outer circumferential surface of the yoke in a 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 an end surface of the yoke in an axial direction of the stator core, The first plate portion has the first surface and the 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 to the end face of the yoke.

8. The stator according to claim 7 , wherein the end surface of the yoke and the third surface of the second plate portion are joined together at an end surface side joint portion.

9. 9. The stator of 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. a yoke groove is provided on the end surface of the yoke along a direction in which the second plate portion extends, The stator according to claim 8 , wherein the end face side mating portion is formed by mating the yoke groove with the second plate portion.

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

12. 4. The stator according to claim 1, wherein the outer peripheral 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 on the inner side of the first outer circumferential surface in the radial direction, and a step surface connecting the first outer circumferential surface and the second outer circumferential surface, 4. The stator according to claim 1, wherein the terminal plate is provided on the stepped surface.

14. a recess that overlaps with the terminal portion in an extension direction of the terminal portion is provided on the outer peripheral surface of the yoke, 4. The stator according to claim 1, wherein the terminal portion is spaced apart from a bottom surface of the recess in a direction in which the terminal portion extends.

15. 4. The stator according to claim 1, wherein the terminal portion does not extend between the first surface and the second surface of the plate portion.

16. 4. The stator according to claim 1, 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 each of the terminal portions has a shape wider than a portion other than the bottom in a direction perpendicular to the direction in which the terminal portions extend.

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

19. 4. The stator according to claim 1, wherein the terminal plate is provided along a boundary between the outer circumferential surface of the yoke and an end face of the yoke in an axial direction of the stator core.

20. A plurality of coil units are arranged in an annular 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 has a split 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 made of a powder 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 rotor provided opposite to an inner circumferential surface of the stator.

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

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