Stator and motor

Abstract

A stator 20A comprises a stator core 30A configured from a magnetic powder molded body and including 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 configured from a winding 41 that is wound around the teeth 32, and a terminal plate 50A fixed to an end surface 31a of the yoke 31 in an axial direction of the stator core 30A, wherein: the terminal plate 50A includes a plate portion 51 and a terminal portion 52a fixed to the plate portion 51; the plate portion 51 includes a first main surface 51a positioned on the end surface 31a side of the yoke 31, in the axial direction, and a second main surface 51b positioned on the opposite side to the end surface 31a of the yoke 31; the terminal portion 52a projects in the axial direction from at least the second main surface 51b of the plate portion 51; and one end portion 41a of the winding 41 is fixed by being tied to the terminal portion 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 a bus bar to electrically connect the coils. As shown in FIG. 4 of Patent Document 1, the bus bar, to which the coils are connected, is fixed to the stator core with screws. However, when the bus bar is fixed to the stator core with screws, additional processing is required to form threaded holes in the stator core after fabrication, which reduces manufacturing efficiency. Furthermore, the stator core is damaged when the threaded holes are formed, which reduces the strength of the stator core. As such, the electric motor described in Patent Document 1 leaves room for improvement in terms of achieving electrical connection of the coils while suppressing the reduction in manufacturing efficiency and strength.

[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 coils while suppressing a decrease in manufacturing efficiency and a decrease in strength, and a motor having the above stator.

[0006] The stator of the present invention comprises a stator core having a circumferentially annular yoke and teeth protruding radially from the inner surface of the yoke, and the stator core is made of a molded body of magnetic powder, a coil made of windings wound around the teeth, and a terminal plate fixed to the end face of the yoke in the axial direction of the stator core, wherein the terminal plate has a plate portion and a terminal portion fixed to the plate portion, the plate portion having a first main surface located on the end face side of the yoke in the axial direction and a second main surface located opposite the end face of the yoke, the terminal portion protruding in the axial direction from at least the second main 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 a coil while suppressing a decrease in manufacturing efficiency and a decrease in strength. Also, according to the present invention, it is possible 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 a coil unit in FIG. 1. FIG. 3 is a schematic perspective view showing a split core in FIG. 2. FIG. 4 is a schematic perspective view showing an example of a state in which the split core and terminal plate in FIG. 2 are disassembled. FIG. 5 is a schematic perspective view showing a coil unit constituting an example of a stator according to a first modified example of the first embodiment of the present invention. FIG. 6 is a schematic perspective view showing an example of a state in which the split core and terminal plate in FIG. 5 are disassembled. FIG. 7 is a schematic perspective view showing a coil unit constituting an example of a stator according to a second modified example of the first embodiment of the present invention. FIG. 8 is a schematic perspective view showing an example of a state in which the split core and terminal plate in FIG. 7 are disassembled. FIG. 9 is a schematic perspective view showing a coil unit constituting an example of a stator according to a third modified example of the first embodiment of the present invention. FIG. 10 is a schematic perspective view showing an example of a state in which the split core and terminal plate in FIG. 9 are disassembled. FIG. 11 is a schematic perspective view showing a coil unit constituting an example of a stator according to a second modified example of the first embodiment of the present invention. FIG. 12 is a schematic perspective view showing an example of a state in which the split cores and terminal plates in FIG. 11 are disassembled. FIG. 13 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. 11. FIG. 14 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 3 of the present invention. FIG. 15 is a schematic perspective view showing a state in which the split cores and terminal plates in FIG. 14 are disassembled. FIG. 16 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 4 of the present invention. FIG. 17 is a schematic perspective view showing an example of a state in which the split cores and terminal plates in FIG. 16 are disassembled. FIG. 18 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 5 of the present invention. FIG. 19 is a schematic perspective view showing an example of a state in which the split cores and terminal plates in FIG. 18 are disassembled. FIG. 20 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. 18. 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 an example of 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 c1-c2 of the coil unit shown in Fig. 21.Fig. 24 is a cross-sectional schematic diagram showing another example of a cross section along line c1-c2 of the coil unit shown in Fig. 21. Fig. 25 is a perspective schematic diagram showing an example of a stator according to embodiment 7 of the present invention. Fig. 26 is a perspective schematic diagram showing the coil unit in Fig. 25. Fig. 27 is a perspective schematic diagram showing an example of a motor according to embodiment 8 of the present invention. Fig. 28 is a perspective schematic diagram showing an example of a motor according to embodiment 9 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] [Stator] A stator of the present invention comprises a stator core having a circumferentially annular yoke and teeth protruding radially from an inner peripheral surface of the yoke, the stator core being made of a molded body of magnetic powder, a coil made of windings wound around the teeth, and a terminal plate fixed to an end face of the yoke in the axial direction of the stator core, the terminal plate having a plate portion and a terminal portion fixed to the plate portion, the plate portion having a first main surface located on the end face side of the yoke in the axial direction and a second main surface located opposite the end face of the yoke, the terminal portion protruding in the axial direction from at least the second main surface of the plate portion, and one end of the winding being fixed in a state of being wound around the terminal portion.

[0015] First Embodiment An example of a stator according to the present invention will be described as a stator according to a first embodiment of the present invention.

[0016] FIG. 1 is a perspective schematic view showing an example of a stator according to a first embodiment of the present invention.

[0017] The stator 20A shown in FIG. 1 includes a stator core 30A, a plurality of coils 40A, and a plurality of terminal plates 50A.

[0018] The stator core 30A has a yoke (also called a core back) 31 and a plurality of teeth 32 .

[0019] 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.

[0020] The yoke 31 is annular and extends in the circumferential direction.

[0021] 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.

[0022] 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.

[0023] In the stator of the present invention, the stator core is preferably made of a powder magnetic core.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Each of the multiple coils 40A is insulated from the teeth 32 via, for example, an insulating member to be described later.

[0028] 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.

[0029] The winding wire 41 may be, for example, polyurethane copper wire (UEW).

[0030] The plurality of terminal plates 50A are each fixed to an end surface 31a of the yoke 31 in the axial direction of the stator core 30A.

[0031] The terminal board 50A has a board portion 51, a terminal portion 52a, and a terminal portion 52b.

[0032] The plate portion 51 has a first main surface 51a located on the end surface 31a side of the yoke 31 in the axial direction, and a second main surface 51b located on the opposite side to the end surface 31a of the yoke 31.

[0033] The plate portion 51 is preferably made of an insulating material.

[0034] Examples of insulating materials that can be used to form the plate portion 51 include resins such as polyphenylene sulfide (PPS).

[0035] The terminal portion 52 a and the terminal portion 52 b are fixed to the plate portion 51 .

[0036] The terminal portion 52 a and the terminal portion 52 b protrude in the axial direction from at least the second main surface 51 b of the plate portion 51 .

[0037] The terminal portion 52a and the terminal portion 52b are spaced apart from each other in the circumferential direction.

[0038] In the stator of the present invention, the terminal portion is preferably made of a conductive material.

[0039] 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.

[0040] Examples of conductive materials that form the terminal portions 52a and 52b include metals such as phosphor bronze.

[0041] 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.

[0042] Examples of insulating materials that form the terminal portions 52a and 52b include resins such as polyphenylene sulfide.

[0043] The constituent materials of the terminal portion 52a and the terminal portion 52b are preferably the same, but may be different.

[0044] 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.

[0045] 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.

[0046] As described above, terminal board 50A is fixed to end surface 31a of yoke 31. That is, terminal board 50A is fixed to end surface 31a of yoke 31 on the side of first main surface 51a of plate portion 51.

[0047] Terminal board 50A is preferably fixed to end surface 31a of yoke 31 via an insulating member (not shown). That is, an insulating member is preferably interposed between end surface 31a of yoke 31 and first main 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.

[0048] The insulating member may be an insulating film that covers at least one of the end face 31 a of the yoke 31 and the first main surface 51 a of the plate portion 51. In this case, the end face 31 a of the yoke 31 may be covered with the insulating film, the first main surface 51 a of the plate portion 51 may be covered with the insulating film, or both the end face 31 a of the yoke 31 and the first main surface 51 a of the plate portion 51 may be covered with the insulating film.

[0049] When the end face 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 end face 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.

[0050] When the first main 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 main 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.

[0051] Methods for coating target surfaces such as the end face 31a of the yoke 31 and the first main 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.

[0052] 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 end surface 31 a of the yoke 31 and the first main surface 51 a of the plate portion 51.

[0053] As described above, when the plate portion 51 is made of an insulating material, the first main 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 main 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 main surface 51 a of the plate portion 51 be covered with an insulating film.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] As described above, in the stator 20A, by utilizing the terminal plate 50A fixed to the end face 31a of the yoke 31, electrical derivation of the coil 40A, for example, electrical derivation of the coil 40A for electrical connection to the wiring board described later, is realized.

[0062] 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 in order to fix the terminal board 50A to the end surface 31a of the yoke 31. This prevents a decrease in the manufacturing efficiency of the stator 20A.

[0063] 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 in order to fix the terminal board 50A to the end face 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.

[0064] Therefore, according to the stator 20A, it is possible to realize electrical lead-out of the coil 40A while suppressing a decrease in manufacturing efficiency and a decrease in strength.

[0065] Furthermore, in the stator 20A, the terminal plate 50A is fixed to the end surface 31a of the yoke 31, so the provision of the terminal plate 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.

[0066] 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 plate and the end face of the yoke are fixed in each coil unit will be described.

[0067] 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.

[0068] 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.

[0069] Fig. 2 is a schematic perspective view showing the coil unit in Fig. 1. Fig. 3 is a schematic perspective view showing the split core in Fig. 2. Fig. 4 is a schematic perspective view showing the split core and terminal plate in Fig. 2 in an exploded state. Note that Fig. 4 does not show the coil to make it easier to understand the structure of the split core and terminal plate. For the same reason, the coil is not shown in the subsequent drawings showing the split core and terminal plate in an exploded state.

[0070] The coil unit 70A shown in FIG. 2 includes a split core 80A, a coil 40A, and a terminal board 50A.

[0071] 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.

[0072] The split core 80A has a split yoke 81 and teeth 32.

[0073] The split yoke 81 is formed by splitting the yoke 31 in the circumferential direction.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] 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. 3, 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.

[0078] 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.

[0079] 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.

[0080] The coil 40A is provided on the teeth 32 of the split core 80A.

[0081] The terminal plate 50A is fixed to an end surface 81a of the split yoke 81 of the split core 80A in the axial direction.

[0082] As shown in FIG. 4, the terminal portion 52a and the terminal portion 52b protrude from the second main surface 51b of the plate portion 51 in the axial direction.

[0083] The terminal portion 52 a and the terminal portion 52 b pass through the plate portion 51 in the axial direction and are exposed from the first main surface 51 a of the plate portion 51 .

[0084] The terminal portion 52 a and the terminal portion 52 b do not protrude from the first main surface 51 a of the plate portion 51 in the axial direction.

[0085] At least one of the terminal portion 52a and the terminal portion 52b may protrude from the first main surface 51a of the plate portion 51 in the axial direction.

[0086] In the stator of the present invention, the end face of the yoke and the first main surface of the plate portion may be joined by a joint portion. In this case, in the stator of the present invention, the joint portion may be formed by joining a convex portion protruding in the axial direction from one of the end face of the yoke and the first main surface of the plate portion and a concave portion recessed in the axial direction from the other of the end face of the yoke and the first main surface of the plate portion.

[0087] As shown in FIGS. 3 and 4, the split yoke 81 of the split core 80A is provided with recesses 86b and 86c recessed in the axial direction from the end face 81a.

[0088] The recesses 86b and 86c are provided on the periphery of the end surface 81a of the split yoke 81. More specifically, the recesses 86b and 86c are provided from the end surface 81a of the split yoke 81 to the inner circumferential surface of the split yoke 81 in the radial direction.

[0089] The recess 86b is spaced apart from the recess 86c in the circumferential direction.

[0090] The three-dimensional shapes of the recess 86b and the recess 86c may be the same as each other or may be different from each other.

[0091] As shown in FIG. 4, the plate portion 51 of the terminal board 50A is provided with a protrusion 55b and a protrusion 55c that protrude in the axial direction from the first main surface 51a.

[0092] The protrusions 55 b and 55 c are provided on the periphery of the first main surface 51 a of the plate portion 51 .

[0093] The protrusion 55b is spaced apart from the protrusion 55c in the circumferential direction.

[0094] The three-dimensional shapes of the protrusions 55b and 55c may be the same as each other or may be different from each other.

[0095] In the coil unit 70A, the end surface 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are mated at a mating portion 90A, as shown in Fig. 4. The mating portion 90A includes a mating portion 90ba formed by mating the recessed portion 86b with the protruding portion 55b, and a mating portion 90ca formed by mating the recessed portion 86c with the protruding portion 55c. In other words, in the coil unit 70A, the terminal plate 50A is fixed to the end surface 81a of the split yoke 81 by mating the recessed portion 86b with the protruding portion 55b and by mating the recessed portion 86c with the protruding portion 55c.

[0096] As described above, in the coil unit 70A, the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are joined at the joining portion 90A, making it easier to fix the terminal board 50A to the end face 81a of the split yoke 81 and facilitating positioning of the terminal board 50A.

[0097] In the split core 80A, the recesses 86b and 86c are formed on the end surface 81a of the split yoke 81, but the recesses 86b and 86c 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 86b and 86c on the end surface 81a of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70A.

[0098] Furthermore, when manufacturing the coil unit 70A, the split core 80A is not damaged when forming the recesses 86b and 86c on the end face 81a of the split yoke 81, and therefore the reduction in strength of the coil unit 70A (more specifically, the split core 80A) is suppressed.

[0099] 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 recesses 86b and 86c are provided, a decrease in manufacturing efficiency and a decrease in strength are suppressed.

[0100] 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.

[0101] The recesses 86b and 86c provided on the end surfaces 81a of the split yoke 81 function when joining the first main surface 51a of the plate portion 51 and the end surfaces 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 86b and 86c are provided on the end surfaces 81a of the split yoke 81, the effect on the magnetic characteristics is minimized. Therefore, in the stator 20A in which a plurality of coil units 70A are arranged in a circumferential ring, the effect on the magnetic characteristics is minimized even if the recesses 86b and 86c are provided.

[0102] In the stator of the present invention, it is preferable that the winding extends toward the terminal portion so as to contact the protrusion at one end side.

[0103] In the coil unit 70A shown in FIG. 2, the winding 41 extends toward the terminal portion 52a so as to contact the protrusion 55b at one end 41a.

[0104] During the manufacturing process of split core 80A, roughness increases and burrs may form at the boundary between end face 81a of split yoke 81 and the inner peripheral surface of split yoke 81. Therefore, when one end 41a of winding 41 is led out to terminal portion 52a, if winding 41 is in contact with the boundary between end face 81a of split yoke 81 and the inner peripheral surface of split yoke 81 on the one end 41a side, the insulating coating of winding 41 may be destroyed by the burrs or the like.

[0105] 2, the winding 41 extends toward the terminal 52a so that the one end 41a of the winding 41 contacts the protrusion 55b. As a result, when the one end 41a of the winding 41 is led out to the terminal 52a, the winding 41 can avoid the boundary between the end face 81a of the split yoke 81 and the inner peripheral surface of the split yoke 81 at the one end 41a, thereby preventing damage to the insulating coating of the winding 41.

[0106] 2, it is preferable that the winding 41 extends toward the terminal 52b so as to contact the protrusion 55c at the other end 41b. In this case, when the other end 41b of the winding 41 is led out to the terminal 52b, the winding 41 can avoid the boundary between the end face 81a of the split yoke 81 and the inner peripheral surface of the split yoke 81 at the other end 41b, thereby preventing damage to the insulating coating of the winding 41.

[0107] In the stator of the present invention, it is preferable that an inner end of the terminal plate is not located more inward than an inner end of the yoke in the radial direction.

[0108] 2, the inner end of terminal plate 50A is not located radially inward of the inner end of split yoke 81 (more specifically, end surface 81a of split yoke 81). In this case, it is easier to wind one end 41a of winding 41 around terminal portion 52a, and it is also easier to wind the other end 41b of winding 41 around terminal portion 52b, compared to when the inner end of terminal plate 50A is located radially inward of the inner end of split yoke 81.

[0109] In the coil unit 70A, the inner end of the terminal plate 50A is not located radially inward from the inner end of the split yoke 81, and the inner end of the terminal plate 50A may be located at the same position as the inner end of the split yoke 81 in the radial direction as shown in Figure 2, or may be located outside.

[0110] In the coil unit 70A, in the radial direction, the outer end of the terminal plate 50A may be located inside, at the same position as, or outside the outer end of the split yoke 81 (more specifically, the end face 81a of the split yoke 81).

[0111] 2, 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, end face 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.

[0112] 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. In this embodiment, the outer end of the terminal plate 50A may be positioned at the same position as the outer end of the split yoke 81 in the circumferential direction as shown in Figure 2, or may be positioned inside.

[0113] In the stator of the present invention, the mating portion that matings the end face of the yoke and the first main surface of the plate portion is not limited to the aspect shown in Fig. 4. Other aspects of the mating portion that matings the end face of the yoke and the first main surface of the plate portion will be described below using other embodiments.

[0114] <First Modification of First Embodiment> Fig. 5 is a schematic perspective view showing a coil unit constituting an example of a stator according to a first modification of the first embodiment of the present invention. Fig. 6 is a schematic perspective view showing a state in which the split cores and the terminal plates in Fig. 5 are disassembled.

[0115] The coil unit 70B shown in FIG. 5 includes a split core 80B, a coil 40A, and a terminal board 50B.

[0116] As shown in FIG. 6, the split yoke 81 of the split core 80B is provided with a protrusion 85b and a protrusion 85c that protrude in the axial direction from an end face 81a.

[0117] The protrusions 85 b and 85 c are provided on the periphery of the end surface 81 a of the split yoke 81 .

[0118] The protrusion 85b is spaced apart from the protrusion 85c in the circumferential direction.

[0119] The three-dimensional shapes of the protrusions 85b and 85c may be the same as each other or may be different from each other.

[0120] As shown in FIG. 6, the plate portion 51 of the terminal plate 50B is provided with recesses 56b and 56c recessed in the axial direction from the first main surface 51a.

[0121] The recesses 56 b and 56 c are provided on the periphery of the first main surface 51 a of the plate portion 51 .

[0122] The recess 56b is spaced apart from the recess 56c in the circumferential direction.

[0123] The three-dimensional shapes of the recess 56b and the recess 56c may be the same as each other or may be different from each other.

[0124] In the coil unit 70B, the end surface 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are mated at a mating portion 90B, as shown in Fig. 6. The mating portion 90B includes a mating portion 90bb formed by the mating of the convex portion 85b and the concave portion 56b, and a mating portion 90cb formed by the mating of the convex portion 85c and the concave portion 56c. In other words, in the coil unit 70B, the terminal plate 50B is fixed to the end surface 81a of the split yoke 81 by the mating of the convex portion 85b and the concave portion 56b, and by the mating of the convex portion 85c and the concave portion 56c.

[0125] As described above, in the coil unit 70B, the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are joined at the joining portion 90B, making it easier to fix the terminal plate 50B to the end face 81a of the split yoke 81 and facilitating positioning of the terminal plate 50B.

[0126] In the split core 80B, the convex portions 85b and 85c are provided on the end surface 81a of the split yoke 81, but the convex portions 85b and 85c are 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 convex portions 85b and 85c on the end surface 81a of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70B and further prevents a decrease in the strength of the coil unit 70B (more specifically, the split core 80B).

[0127] <Modification 2 of Embodiment 1> Fig. 7 is a schematic perspective view showing a coil unit constituting an example of a stator according to Modification 2 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 plates in Fig. 7 are disassembled.

[0128] A coil unit 70C shown in FIG. 7 includes a split core 80C, a coil 40A, and a terminal board 50C.

[0129] 8, the split yoke 81 of the split core 80C is provided with a protrusion 85a that protrudes in the axial direction from the end face 81a. Furthermore, the split yoke 81 of the split core 80C is provided with recesses 86b and 86c that are recessed in the axial direction from the end face 81a.

[0130] The protrusion 85 a , the recess 86 b , and the recess 86 c are provided on the periphery of the end surface 81 a of the split yoke 81 .

[0131] The protrusion 85a is located more inward than the recesses 86b and 86c in the circumferential direction, and more outward than the recesses 86b and 86c in the radial direction.

[0132] The recessed portion 86b is located outward from the protruding portion 85a in the circumferential direction, and is located inward from the protruding portion 85a in the radial direction. Furthermore, the recessed portion 86b is spaced apart from the recessed portion 86c in the circumferential direction.

[0133] The recessed portion 86c is located outward from the protruding portion 85a in the circumferential direction, and is located inward from the protruding portion 85a in the radial direction.

[0134] The three-dimensional shapes of the recess 86b and the recess 86c may be the same as each other or may be different from each other.

[0135] 8, plate portion 51 of terminal board 50C is provided with recessed portion 56a recessed in the axial direction from first main surface 51a. Furthermore, plate portion 51 of terminal board 50C is provided with protruding portions 55b and 55c protruding in the axial direction from first main surface 51a.

[0136] The recess 56 a, the protrusion 55 b, and the protrusion 55 c are provided on the periphery of the first main surface 51 a of the plate portion 51.

[0137] The recessed portion 56a is located more inward than the protruding portions 55b and 55c in the circumferential direction, and more outward than the protruding portions 55b and 55c in the radial direction.

[0138] The protrusions 55b are located outward from the recesses 56a in the circumferential direction, and are located inward from the recesses 56a in the radial direction. Furthermore, the protrusions 55b are spaced apart from the protrusions 55c in the circumferential direction.

[0139] The protrusions 55c are located outward from the recesses 56a in the circumferential direction, and are located inward from the recesses 56a in the radial direction.

[0140] The three-dimensional shapes of the protrusions 55b and 55c may be the same as each other or may be different from each other.

[0141] In coil unit 70C, end surface 81a of split yoke 81 and first main surface 51a of plate portion 51 are mated at mating portion 90C, as shown in Fig. 8. Mating portion 90C includes mating portion 90ab formed by mating convex portion 85a with concave portion 56a, mating portion 90ba formed by mating concave portion 86b with convex portion 55b, and mating portion 90ca formed by mating concave portion 86c with convex portion 55c. In other words, in coil unit 70C, terminal plate 50C is fixed to end surface 81a of split yoke 81 by mating convex portion 85a with concave portion 56a, mating concave portion 86b with convex portion 55b, and mating concave portion 86c with convex portion 55c.

[0142] As described above, in the coil unit 70C, the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are joined at the joining portion 90C, making it easier to fix the terminal board 50C to the end face 81a of the split yoke 81 and facilitating positioning of the terminal board 50C.

[0143] In the split core 80C, the end surface 81a of the split yoke 81 is provided with a protrusion 85a, a recess 86b, and a recess 86c, but the protrusion 85a, the recess 86b, and the recess 86c 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 protrusion 85a, the recess 86b, and the recess 86c on the end 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).

[0144] In the stator of the present invention, the engagement portion may overlap a peripheral edge of the end face of the yoke and a peripheral edge of the first main surface of the plate portion in the axial direction.

[0145] The mating portion 90C shown in Figure 8, here, mating portion 90ab, mating portion 90ba, and mating portion 90ca, overlap the peripheral edge of the end face 81a of the split yoke 81 and the peripheral edge of the first main surface 51a of the plate portion 51 in the axial direction.

[0146] In the stator of the present invention, it is preferable that the mating portion includes a first mating portion and a second mating portion located more inwardly than the first mating portion in the radial direction.

[0147] 8 includes a mating portion 90ab and a mating portion 90ba or a mating portion 90ca located radially inward of the mating portion 90ab. That is, in the mating portion 90C, the mating portion 90ab corresponds to the first mating portion, and the mating portion 90ba or the mating portion 90ca corresponds to the second mating portion. In this way, the mating portions that fit the end surface 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are provided separately and spaced apart in the radial direction, which makes it difficult for the terminal plate 50C to slip off the end surface 81a of the split yoke 81.

[0148] In the stator of the present invention, it is preferable that the mating portion further includes a third mating portion that is located more inward than the first mating portion in the radial direction and is spaced apart from the second mating portion in the circumferential direction.

[0149] 8 includes mating portions 90ba and 90ca, which are located radially inward of mating portion 90ab and spaced apart circumferentially. That is, in mating portion 90C, mating portion 90ab corresponds to the first mating portion, one of mating portions 90ba and 90ca corresponds to the second mating portion, and the other of mating portions 90ba and 90ca corresponds to the third mating portion. Because the mating portions that fit between end surface 81a of split yoke 81 and first main surface 51a of plate portion 51 are separated and spaced apart radially and circumferentially, terminal plate 50C is highly unlikely to slip off end surface 81a of split yoke 81.

[0150] 8 illustrates an example in which three mating portions are provided in one set of split yoke 81 and plate portion 51, but the total number of mating portions is not particularly limited. That is, one set of split yoke 81 and plate portion 51 may have one or more mating portions.

[0151] While Figure 8 illustrates an example in which one mating portion is provided on the radially outer side and two mating portions are provided on the radially inner side in one set of split yokes 81 and plate portions 51, the number of mating portions on the radially outer and inner sides is not particularly limited. For example, one set of split yokes 81 and plate portions 51 may have at least one mating portion on the radially outer side and at least one mating portion on the radially inner side. In this case, the number of mating portions on one set of split yokes 81 and plate portions 51 may be the same on the radially outer and inner sides, or may be different. Note that one set of split yokes 81 and plate portions 51 does not necessarily have to have a mating portion on either the radially outer or inner side.

[0152] Figure 8 illustrates an example in which the mating portions that engage the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are arranged so as to be spaced apart in the radial direction, but the mating portions do not have to be arranged so as to be spaced apart in the radial direction.

[0153] Figure 8 illustrates an example in which the mating portions that engage the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are arranged so as to be spaced apart in the circumferential direction, but the mating portions do not have to be arranged so as to be spaced apart in the circumferential direction.

[0154] <Third Modification of First Embodiment> Fig. 9 is a schematic perspective view showing a coil unit constituting an example of a stator according to a third modification of the first embodiment of the present invention. Fig. 10 is a schematic perspective view showing a state in which the split cores and the terminal plates in Fig. 9 are disassembled.

[0155] A coil unit 70D shown in FIG. 9 includes a split core 80D, a coil 40A, and a terminal board 50D.

[0156] As shown in FIG. 10, the split yoke 81 of the split core 80D is provided with recesses 86a, 86b, and 86c recessed in the axial direction from the end face 81a.

[0157] The recesses 86 a , 86 b , and 86 c are provided on the periphery of the end surface 81 a of the split yoke 81 .

[0158] The recess 86a is located more inward than the recesses 86b and 86c in the circumferential direction, and more outward than the recesses 86b and 86c in the radial direction.

[0159] The recessed portion 86b is located outward from the recessed portion 86a in the circumferential direction, and is located inward from the recessed portion 86a in the radial direction. Furthermore, the recessed portion 86b is spaced apart from the recessed portion 86c in the circumferential direction.

[0160] The recessed portion 86c is located outward from the recessed portion 86a in the circumferential direction, and is located inward from the recessed portion 86a in the radial direction.

[0161] The three-dimensional shapes of the recesses 86a, 86b, and 86c may be the same as one another, may be different from one another, or may be partially different from one another.

[0162] As shown in FIG. 10, the plate portion 51 of the terminal board 50D is provided with protrusions 55a, 55b, and 55c that protrude in the axial direction from the first main surface 51a.

[0163] The protrusions 55 a , 55 b , and 55 c are provided on the periphery of the first main surface 51 a of the plate portion 51 .

[0164] The protrusion 55a is located more inward than the protrusions 55b and 55c in the circumferential direction, and more outward than the protrusions 55b and 55c in the radial direction.

[0165] The protrusion 55b is located outward from the protrusion 55a in the circumferential direction, and is located inward from the protrusion 55a in the radial direction. Furthermore, the protrusion 55b is spaced apart from the protrusion 55c in the circumferential direction.

[0166] The protrusion 55c is located outward of the protrusion 55a in the circumferential direction, and is located inward of the protrusion 55a in the radial direction.

[0167] The three-dimensional shapes of the protrusions 55a, 55b, and 55c may be the same as one another, may be different from one another, or may be partially different from one another.

[0168] In coil unit 70D, end surface 81a of split yoke 81 and first main surface 51a of plate portion 51 are mated at mating portion 90D, as shown in Fig. 10. Mating portion 90D includes mating portion 90aa formed by mating recess 86a with protrusion 55a, mating portion 90ba formed by mating recess 86b with protrusion 55b, and mating portion 90ca formed by mating recess 86c with protrusion 55c. In other words, in coil unit 70D, terminal plate 50D is fixed to end surface 81a of split yoke 81 by mating recess 86a with protrusion 55a, mating recess 86b with protrusion 55b, and mating recess 86c with protrusion 55c.

[0169] As described above, in the coil unit 70D, the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are joined at the joining portion 90D, making it easier to fix the terminal board 50D to the end face 81a of the split yoke 81 and facilitating positioning of the terminal board 50D.

[0170] In the split core 80D, the end surface 81a of the split yoke 81 is provided with recesses 86a, 86b, and 86c, but the recesses 86a, 86b, and 86c are 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 recesses 86a, 86b, and 86c on the end surface 81a of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70D and further prevents a decrease in the strength of the coil unit 70D (more specifically, the split core 80D).

[0171] In the stator of the present invention, the configuration of the mating portion that engages the end face of the yoke with the first main surface of the plate portion may be other than the configurations of the above-mentioned embodiment 1, variant 1 of embodiment 1, variant 2 of embodiment 1, and variant 3 of embodiment 1.

[0172] In the stator of the present invention, the mating portion may overlap the terminal portion in the axial direction. 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 second embodiment of the present invention.

[0173] In the stator of the present invention, when the mating portion overlaps the terminal portion in the axial direction, it is preferable that the convex portion is arranged to protrude in the axial direction from the first main surface of the plate portion, and the concave portion is arranged to be recessed in the axial direction from the end face of the yoke.

[0174] Fig. 11 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 2 of the present invention. Fig. 12 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 11 are disassembled. Fig. 13 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. 11.

[0175] A coil unit 70E shown in FIG. 11 includes a split core 80E, a coil 40A, and a terminal board 50E.

[0176] As shown in FIG. 12, the split yoke 81 of the split core 80E is provided with recesses 86d and 86e recessed in the axial direction from the end face 81a.

[0177] The recessed portion 86d and the recessed portion 86e are spaced apart from each other in the circumferential direction.

[0178] The three-dimensional shapes of the recess 86d and the recess 86e may be the same as each other or may be different from each other.

[0179] As shown in FIG. 12, the plate portion 51 of the terminal board 50E is provided with a protrusion 55d and a protrusion 55e that protrude in the axial direction from the first main surface 51a.

[0180] The protrusion 55d overlaps the terminal portion 52a in the axial direction.

[0181] The protrusion 55e overlaps the terminal portion 52b in the axial direction.

[0182] The protrusions 55d and 55e are spaced apart from each other in the circumferential direction.

[0183] The three-dimensional shapes of the protrusions 55d and the protrusions 55e may be the same as each other or may be different from each other.

[0184] In coil unit 70E, end surface 81a of split yoke 81 and first main surface 51a of plate portion 51 are mated at mating portion 90E, as shown in Fig. 12. Mating portion 90E includes mating portion 90da formed by mating recess 86d with protrusion 55d, and mating portion 90ea formed by mating recess 86e with protrusion 55e. In other words, in coil unit 70E, terminal plate 50E is fixed to end surface 81a of split yoke 81 by mating recess 86d with protrusion 55d and mating recess 86e with protrusion 55e.

[0185] In the mating portion 90E, the recess 86d and the protrusion 55d overlap in the axial direction at the mating portion 90da, and the recess 86e and the protrusion 55e overlap in the axial direction at the mating portion 90ea. Meanwhile, as described above, in the terminal board 50E, the protrusion 55d and the terminal portion 52a overlap in the axial direction, and the protrusion 55e and the terminal portion 52b overlap in the axial direction. Therefore, with regard to the positional relationship between the mating portion 90E and the terminal board 50E, the mating portion 90da overlaps with the terminal portion 52a in the axial direction, and the mating portion 90ea overlaps with the terminal portion 52b in the axial direction.

[0186] As described above, in the coil unit 70E, the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are joined at the joining portion 90E, making it easier to fix the terminal board 50E to the end face 81a of the split yoke 81 and facilitating positioning of the terminal board 50E.

[0187] In this way, in coil unit 70E, by using only two mating portions, mating portion 90da and mating portion 90ea, terminal board 50E can be fixed to end surface 81a of split yoke 81, making it possible to position terminal board 50E.

[0188] In the split core 80E, the recesses 86d and 86e are formed in the end surface 81a of the split yoke 81, but the recesses 86d and 86e 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 provide the recesses 86d and 86e in the end surface 81a 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).

[0189] Furthermore, in terminal strip 50E, convex portion 55d is provided at a position overlapping terminal portion 52a in the axial direction, and therefore, compared to a case in which convex portion 55d is not provided, it is possible to increase the axial dimension of terminal portion 52a embedded in plate portion 51, as shown in Fig. 13. As a result, in terminal strip 50E, 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.

[0190] In addition, Figure 13 shows a cross section of the coil unit 70E at the position where the terminal portion 52a and the protrusion portion 55d overlap in the axial direction, but it is preferable that the cross section of the coil unit 70E at the position where the terminal portion 52b and the protrusion portion 55e overlap in the axial direction be the same as that shown in Figure 13.

[0191] In the stator of the present invention, the mating portion may be formed by mating the plate portion with a recess recessed from the end face of the yoke in the axial direction. A stator different 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.

[0192] Fig. 14 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 3 of the present invention. Fig. 15 is a schematic perspective view showing a state in which the split cores and the terminal plates in Fig. 14 are disassembled.

[0193] A coil unit 70F shown in FIG. 14 includes a split core 80F, a coil 40A, and a terminal board 50F.

[0194] As shown in FIG. 15, the split yoke 81 of the split core 80F is provided with a recess 86f recessed in the axial direction from the end face 81a.

[0195] The recess 86f is provided radially from the inner peripheral surface to the outer peripheral surface of the split yoke 81.

[0196] The terminal board 50F has a board portion 51 and a terminal portion 52a.

[0197] One end 41a of the winding 41 is fixed in a state where it is wound around the terminal portion 52a, so that the one end 41a of the winding 41 is led out to the terminal plate 50F.

[0198] In coil unit 70F, end surface 81a of split yoke 81 and first main surface 51a of plate portion 51 are joined at joint portion 90F, as shown in Fig. 15. Joint portion 90F is composed of joint portion 90fa formed by joining plate portion 51 with recessed portion 86f provided in end surface 81a of split yoke 81. In other words, in coil unit 70F, terminal plate 50F is fixed to end surface 81a of split yoke 81 by the joint between recessed portion 86f and plate portion 51.

[0199] As described above, in the coil unit 70F, the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are joined at the joining portion 90F, making it easier to fix the terminal board 50F to the end face 81a of the split yoke 81 and facilitating positioning of the terminal board 50F.

[0200] In the split core 80F, a recess 86f is provided on the end surface 81a of the split yoke 81, but the recess 86f is formed simultaneously with the molding of the split core 80F. In other words, when manufacturing the coil unit 70F, there is no need to perform additional processing on the molded split core 80F to provide the recess 86f on the end surface 81a of the split yoke 81. This prevents a decrease in the manufacturing efficiency of the coil unit 70F and also prevents a decrease in the strength of the coil unit 70F (more specifically, the split core 80F).

[0201] Furthermore, even if the recesses 86f provided on the end surfaces 81a of the split yokes 81 are shallower than the screw holes described in Patent Document 1, for example, they function when joining the first main surface 51a of the plate portion 51 and the end surfaces 81a of the split yokes 81. Therefore, in the coil unit 70F, even if the recesses 86f are provided on the end surfaces 81a of the split yokes 81, the effect on the magnetic characteristics is kept to a minimum.

[0202] Furthermore, in coil unit 70F, because plate portion 51 is housed in recess 86f, the axial dimension of the entire coil unit is reduced compared to, for example, coil unit 70A, etc. In other words, coil unit 70F can be made thinner (lower in height) in the axial direction.

[0203] In the coil unit 70F, at the mating portion 90F (matting portion 90fa), it is sufficient that the recess 86f and at least a portion of the plate portion 51 are mated, and as shown in Fig. 15, it is preferable that the recess 86f and the entire plate portion 51 are mated. In other words, it is preferable that the depth of the recess 86f is equal to or greater than the axial dimension of the plate portion 51.

[0204] At the mating portion 90F (matting portion 90fa), the recess 86f may be mated with a part of the plate portion 51. In other words, the axial dimension of the plate portion 51 may be greater than the depth of the recess 86f.

[0205] As described above, a stator in which a plurality of coil units 70F are arranged in a ring shape in the circumferential direction can be made thinner (lower in height) in the axial direction while minimizing the effect on magnetic properties.

[0206] In the stator of the present invention, it is preferable that a winding recess is provided on the periphery of the second main surface of the plate portion when viewed from the axial direction, and the winding extends toward the terminal portion so as to pass through the winding recess at one end side.

[0207] 14 and 15 , a winding recess 57a is provided on the periphery of the second main surface 51b of the plate portion 51 when viewed in the axial direction. The winding 41 extends toward the terminal portion 52a so as to pass through the winding recess 57a at one end 41a. This reduces the contact of the winding 41 with the boundary between the end surface 81a (recess 86f) of the split yoke 81 and the inner circumferential surface of the split yoke 81 at one end 41a when the winding 41 is led out to the terminal portion 52a. This reduces the risk of burrs forming at the boundary between the end surface 81a (recess 86f) of the split yoke 81 and the inner circumferential surface of the split yoke 81, thereby preventing damage to the insulating coating of the winding 41 due to burrs that may form at the boundary between the end surface 81a (recess 86f) of the split yoke 81 and the inner circumferential surface of the split yoke 81.

[0208] In addition, in other coil units such as coil unit 70A, a winding recess may be provided on the periphery of the second main surface of the plate portion when viewed in the axial direction, and the winding may extend toward the terminal portion so as to pass through the winding recess on one end side.

[0209] In the stator of the present invention, the end surface of the yoke and the first main 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.

[0210] Fig. 16 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 4 of the present invention. Fig. 17 is a schematic perspective view showing a state in which the split cores and the terminal plates in Fig. 16 are disassembled.

[0211] A coil unit 70G shown in FIG. 16 includes a split core 80G, a coil 40A, and a terminal board 50G.

[0212] In coil unit 70G, end surface 81 a of split yoke 81 is joined to first main surface 51 a of plate portion 51. That is, terminal plate 50G is fixed to end surface 81 a of split yoke 81 by a joint (not shown).

[0213] The joining portion may be made of, for example, an adhesive.

[0214] As described above, in the coil unit 70G, the end face 81a of the split yoke 81 and the first main surface 51a of the plate portion 51 are joined, making it easier to fix the terminal board 50G to the end face 81a of the split yoke 81, and making it easier to position the terminal board 50G.

[0215] In this way, unlike coil unit 70A, etc., coil unit 70G has a simple structure that does not use a joint, as shown in Figure 17, which allows terminal board 50G to be fixed to end face 81a of split yoke 81, making it possible to position terminal board 50G.

[0216] In addition, even in an embodiment in which the terminal plate is fixed to the end face of the split yoke using a joint portion, such as coil unit 70A, the end face of the split yoke and the first main surface of the plate portion may be joined in addition to being jointed.

[0217] In the stator of the present invention, the end surface of the yoke may be provided with a recess that overlaps with the terminal portion in the axial direction, and the terminal portion may be spaced apart from a bottom surface of the recess in the axial direction. 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.

[0218] Fig. 18 is a schematic perspective view showing a coil unit constituting an example of a stator according to embodiment 5 of the present invention. Fig. 19 is a schematic perspective view showing a state in which the split cores and terminal plates in Fig. 18 are disassembled. Fig. 20 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. 18.

[0219] A coil unit 70H shown in FIG. 18 includes a split core 80H, a coil 40A, and a terminal board 50A.

[0220] As shown in FIG. 19, the split yoke 81 of the split core 80H is provided with recesses 86b and 86c recessed in the axial direction from the end face 81a.

[0221] As shown in FIG. 19, recesses 87a and 87b are further provided on the end surface 81a of the split yoke 81 of the split core 80H.

[0222] The recesses 87a and the recesses 87b are spaced apart from each other in the circumferential direction.

[0223] The three-dimensional shapes of the recesses 87a and 87b may be the same as each other or may be different from each other.

[0224] The terminal plate 50A of the coil unit 70H has the same configuration as the terminal plate 50A of the coil unit 70A. That is, as shown in Fig. 19, the plate portion 51 of the terminal plate 50A of the coil unit 70H is provided with a protrusion 55b and a protrusion 55c that protrude in the axial direction from the first main surface 51a.

[0225] In coil unit 70H, end surface 81a of split yoke 81 and first main surface 51a of plate portion 51 are joined at joint portion 90A, as shown in Fig. 19. This makes it easier to fix terminal board 50A to end surface 81a of split yoke 81 in coil unit 70H, facilitating positioning of terminal board 50A.

[0226] In coil unit 70H, when terminal board 50A is fixed to end surface 81a of split yoke 81, recess 87a overlaps terminal portion 52a in the axial direction. Furthermore, in coil unit 70H, when terminal board 50A is fixed to end surface 81a of split yoke 81, terminal portion 52a is spaced apart from the bottom surface of recess 87a in the axial direction, as shown in FIG. 20 . This ensures that terminal portion 52a does not come into contact with split yoke 81 when terminal board 50A is fixed to end surface 81a of split yoke 81, even if terminal portion 52a is exposed from first main surface 51a of plate portion 51 or even if terminal portion 52a protrudes axially from first main surface 51a of plate portion 51. Therefore, the structure shown in FIG. 20 ensures insulation between split yoke 81 and terminal portion 52a. Furthermore, according to the structure shown in Figure 20, 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).

[0227] In coil unit 70H, recess 87b overlaps terminal portion 52b in the axial direction when terminal board 50A is fixed to end surface 81a of split yoke 81. Furthermore, in coil unit 70H, when terminal board 50A is fixed to end surface 81a of split yoke 81, terminal portion 52b is spaced apart from the bottom surface of recess 87b in the axial direction, as in FIG.

[0228] In the coil unit 70H, when the terminal plate 50A is fixed to the end face 81a of the split yoke 81, it is sufficient that at least one of the terminal portion 52a and the terminal portion 52b is spaced apart from the bottom surface of the recess in the axial direction, or only one of the terminal portion 52a and the terminal portion 52b may be spaced apart from the bottom surface of the recess in the axial direction.

[0229] In the split core 80H, the end 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 end 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).

[0230] In addition, in other coil units such as coil unit 70A (excluding coil unit 70E), a recess that overlaps with the terminal portion in the axial direction may be provided on the end surface of the split yoke, and the terminal portion may be separated from the bottom surface of the recess in the axial direction.

[0231] In the stator of the present invention, the terminal portion does not have to penetrate the plate portion in the axial direction. 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.

[0232] 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 c1-c2 of the coil unit shown in Fig. 21.

[0233] A coil unit 70J shown in FIG. 21 includes a split core 80A, a coil 40A, and a terminal board 50J.

[0234] The split core 80A of the coil unit 70J has the same configuration as the split core 80A of the coil unit 70A. That is, as shown in Fig. 22, the split yoke 81 of the split core 80A of the coil unit 70J is provided with recesses 86b and 86c recessed in the axial direction from the end face 81a.

[0235] As will be described later, the terminal board 50J of the coil unit 70J has the same configuration as the terminal board 50A of the coil unit 70A, except that the terminal portions 52a and 52b are not exposed from the first main surface 51a of the board portion 51. That is, as shown in Fig. 22, the board portion 51 of the terminal board 50J is provided with the protrusions 55b and 55c that protrude in the axial direction from the first main surface 51a.

[0236] In coil unit 70J, end surface 81a of split yoke 81 and first main surface 51a of plate portion 51 are joined at joint portion 90A, as shown in Fig. 22. This makes it easier to fix terminal plate 50J to end surface 81a of split yoke 81 in coil unit 70J, facilitating positioning of terminal plate 50J.

[0237] In the coil unit 70J, as shown in FIG. 23 , the terminal portion 52a of the terminal board 50J does not axially penetrate the plate portion 51. That is, the terminal portion 52a of the terminal board 50J is not exposed from the first main surface 51a of the plate portion 51. This allows the terminal portion 52a to be configured so that the terminal portion 52a does not contact the split yoke 81 when the terminal board 50J is fixed to the end surface 81a of the split yoke 81. Therefore, the structure shown in FIG. 23 ensures insulation between the split yoke 81 and the terminal portion 52a. Furthermore, with the structure shown in FIG. 23 , when, for example, soldering is used to electrically connect one end 41a of the winding 41 to a terminal on a wiring board, as described below, heat generated during soldering is less likely to be transmitted from the terminal portion 52a to the split yoke 81. As a result, damage to the split core 80A is less likely to occur, and a decrease in the strength of the coil unit 70J (more specifically, the split core 80A) is suppressed.

[0238] In the coil unit 70J, similarly to FIG. 23, the terminal portion 52b of the terminal board 50J does not pass through the board portion 51 in the axial direction.

[0239] In the coil unit 70J, in the terminal plate 50J, it is sufficient that at least one of the terminal portions 52a and 52b does not penetrate the plate portion 51 in the axial direction, and it is also sufficient that only one of the terminal portions 52a and 52b does not penetrate the plate portion 51 in the axial direction.

[0240] For example, in terminal board 50J, when terminal portion 52b does not pass through plate portion 51 in the axial direction, terminal portion 52a may pass through plate portion 51 in the axial direction.

[0241] FIG. 24 is a schematic cross-sectional view showing another example of the cross section of the coil unit shown in FIG. 21 taken along the line c1-c2.

[0242] In the terminal board 50J shown in FIG. 24, the terminal portion 52a penetrates the board portion 51 in the axial direction.

[0243] As shown in FIG. 24 , the bottom of terminal portion 52a may be wider in the radial direction than the other portions. Furthermore, in terminal board 50J, the bottom of terminal portion 52a may be wider in the circumferential direction than the other portions. That is, in terminal board 50J, the bottom of terminal portion 52a may be wider in at least one of the radial and circumferential directions than the other portions. By having the bottom of terminal portion 52a be wider in this way, terminal portion 52a is less likely to come off plate portion 51 in the axial direction.

[0244] As shown in FIG. 24 , the terminal portion 52a may be spaced apart from the end surface 81a of the split yoke 81 in the axial direction. That is, a cavity 88 may be provided between the terminal portion 52a and the split yoke 81. In this case, even if the terminal portion 52a penetrates the plate portion 51 in the axial direction, the terminal portion 52a does not contact the split yoke 81 when the terminal plate 50J is fixed to the end surface 81a of the split yoke 81. Therefore, the structure shown in FIG. 24 ensures insulation between the split yoke 81 and the terminal portion 52a. Furthermore, with the structure shown in FIG. 24 , when, for example, soldering is used to electrically connect one end 41a of the winding 41 to a terminal on a wiring board, as described below, heat generated during soldering is less likely to be transmitted from the terminal portion 52a to the split yoke 81. As a result, damage to the split core 80A is less likely to occur, and a decrease in the strength of the coil unit 70J (more specifically, the split core 80A) is suppressed.

[0245] In other coil units such as the coil unit 70A, the terminal portion does not have to pass through the plate portion in the axial direction.

[0246] Seventh Embodiment 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 that differs from the stator of the fourth embodiment of the present invention in this respect will be described below as a stator of the seventh embodiment of the present invention.

[0247] Fig. 25 is a schematic perspective view showing an example of a stator according to a seventh embodiment of the present invention. Fig. 26 is a schematic perspective view showing a coil unit in Fig. 25.

[0248] A stator 20K shown in FIG. 25 includes a coil unit 70K.

[0249] A coil unit 70K shown in FIG. 26 includes a split core 80G, a coil 40A, and a terminal board 50K.

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

[0251] The terminal board 50K has a board portion 51 and a terminal portion 52a.

[0252] 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 50K.

[0253] In the stator 20K, the coil unit 70K is used, for example, when connecting the windings 41 of the multiple coils 40A in series. In this case, as shown in Fig. 25 , the stator 20K may further include, in addition to the coil unit 70K, a coil unit 71K in which both ends of the winding 41 are not led out to the terminal plate. In other words, the stator 20K may include a mixture of the coil unit 70K in which one end 41a of the winding 41 is led out to the terminal plate and the coil unit 71K in which both ends of the winding 41 are not led out to the terminal plate.

[0254] In other coil units such as the coil unit 70A, the terminal plate may also have only one terminal portion.

[0255] 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.

[0256] 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.

[0257] 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.

[0258] [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.

[0259] Eighth Embodiment An example of the motor of the present invention will be described as a motor of an eighth embodiment of the present invention.

[0260] FIG. 27 is a schematic perspective view showing an example of a motor according to an eighth embodiment of the present invention.

[0261] A motor 1A shown in FIG. 27 includes a rotor 10A and a stator 20A.

[0262] 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.

[0263] The rotor 10A is disposed opposite the inner peripheral surface of the stator 20A.

[0264] The rotor 10A includes, for example, a rotor yoke 11, a shaft 12, and a permanent magnet 13.

[0265] 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.

[0266] The shaft 12 is inserted through the rotor yoke 11 .

[0267] Examples of materials that can be used to form the shaft 12 include metals such as stainless steel.

[0268] 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.

[0269] 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.

[0270] When viewed in the axial direction, the rotor 10A may have a substantially circular shape or a substantially polygonal shape.

[0271] 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.

[0272] Ninth Embodiment The motor of the present invention may further include a wiring board electrically connected to one end of the winding. A motor that differs from the motor of the eighth embodiment of the present invention in this respect will be described below as a ninth embodiment of the present invention.

[0273] FIG. 28 is a schematic perspective view showing an example of a motor according to a ninth embodiment of the present invention.

[0274] The motor 1B shown in FIG. 28 further includes a wiring board 25A in addition to the rotor 10A and the stator 20A.

[0275] 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.

[0276] The wiring board 25A is provided with a plurality of through holes 26 that penetrate in the axial direction and are spaced apart from one another in the circumferential direction.

[0277] In the wiring board 25A, a terminal (not shown) is exposed on the inner wall surface of each through hole 26.

[0278] In motor 1B, wiring board 25A is mounted on 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. Therefore, when wiring board 25A is mounted on stator 20A as described above, one end 41a of winding 41 wound around terminal portion 52a and the other end 41b of winding 41 wound around terminal portion 52b can be efficiently connected to terminals exposed from the inner wall surfaces of the separate through holes 26. Therefore, according to motor 1B, electrical connection between one end 41a of winding 41 and the terminal of wiring board 25A, and electrical connection between the other end 41b of winding 41 and the terminal of wiring board 25A can be easily achieved.

[0279] The present specification discloses the following:

[0280] <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 fixed to an end surface of the yoke in an axial direction of the stator core, wherein the terminal plate has a plate portion and a terminal portion fixed to the plate portion, the plate portion having a first main surface located on the end surface side of the yoke in the axial direction and a second main surface located opposite the end surface of the yoke, the terminal portion protruding in the axial direction from at least the second main surface of the plate portion, and one end of the winding is fixed in a state of being wound around the terminal portion.

[0281] <2> The stator according to <1>, wherein the end surface of the yoke and the first main surface of the plate portion are joined at a joint portion.

[0282] <3> The stator according to <2>, wherein the mating portion is formed by mating a convex portion protruding in the axial direction from one of the end face of the yoke and the first main surface of the plate portion with a concave portion recessed in the axial direction from the other of the end face of the yoke and the first main surface of the plate portion.

[0283] <4> The stator according to <3>, wherein the engagement portion overlaps with a periphery of the end face of the yoke and a periphery of the first main surface of the plate portion in the axial direction.

[0284] <5> The stator according to <3> or <4>, wherein the engagement portion includes a first engagement portion and a second engagement portion located more inward than the first engagement portion in the radial direction.

[0285] <6> The stator according to <5>, wherein the mating portion further includes a third mating portion located more inward than the first mating portion in the radial direction and spaced apart from the second mating portion in the circumferential direction.

[0286] <7> The stator according to any one of <4> to <6>, wherein the winding extends toward the terminal portion so as to contact the protrusion at one end side.

[0287] <8> The stator according to <3>, wherein the mating portion overlaps the terminal portion in the axial direction.

[0288] <9> The stator according to <8>, wherein the convex portion is provided so as to protrude from the first main surface of the plate portion in the axial direction, and the concave portion is provided so as to be recessed from the end surface of the yoke in the axial direction.

[0289] <10> The stator according to <2>, wherein the mating portion is formed by mating the plate portion with a recess recessed in the axial direction from the end face of the yoke.

[0290] <11> The stator according to any one of <1> to <10>, wherein a winding recess is provided on a periphery of the second main surface of the plate portion when viewed from the axial direction, and the winding extends toward the terminal portion so as to pass through the winding recess at one end side.

[0291] <12> The stator according to any one of <1> to <11>, wherein the end surface of the yoke and the first main surface of the plate portion are joined together.

[0292] <13> The stator according to any one of <1> to <12>, wherein a recess overlapping the terminal portion in the axial direction is provided on the end surface of the yoke, and the terminal portion is spaced apart from a bottom surface of the recess in the axial direction.

[0293] <14> The stator according to any one of <1> to <13>, wherein the terminal portion does not penetrate the plate portion in the axial direction.

[0294] <15> The stator according to any one of <1> to <14>, wherein an inner end of the terminal plate is not positioned more inward than an inner end of the yoke in the radial direction.

[0295] <16> The stator according to any one of <1> to <15>, 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.

[0296] <17> The stator according to any one of <1> to <16>, wherein the stator core is made of a powder magnetic core.

[0297] <18> The stator according to any one of <1> to <17>, wherein the terminal portion is made of a conductive material.

[0298] <19> A motor comprising: the stator according to any one of <1> to <18>; and a rotor provided opposite to the inner peripheral surface of the stator.

[0299] <20> The motor according to <19>, further comprising a wiring board electrically connected to one end of the winding.

[0300] 1A, 1B Motor 10A Rotor 11 Rotor yoke 12 Shaft 13 Permanent magnet 20A, 20K Stator 25A Wiring board 26 Through hole 30A Stator core 31 Yoke 31a 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, 50G, 50J, 50K Terminal board 51 Plate portion 51a First main surface of plate portion 51b Second main surface of plate portion 52a, 52b Terminal portion 55a, 55b, 55c, 55d, 55e Convex portion of plate portion 56a, 56b, 56c Concave portion of plate portion 57a ​​Recess for winding 70A, 70B, 70C, 70D, 70E, 70F, 70G, 70H, 70J, 70K, 71K Coil unit 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H Split core 81 Split yoke 81a End surface of split yoke 85a, 85b, 85c Convex portion of split yoke 86a, 86b, 86c, 86d, 86e, 86f Concave portion of split yoke 87a, 87b Depression of split yoke 88 Cavity 90A, 90B, 90C, 90D, 90E, 90F, 90aa, 90ab, 90ba, 90bb, 90ca, 90cb, 90da, 90ea, 90fa Joint portion 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 fixed to an end surface of the yoke in the axial direction of the stator core and not extending from the end surface of the yoke to a position overlapping the teeth, The terminal board has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first main surface located on the end face side of the yoke in the axial direction and a second main surface located on the opposite side to the end face of the yoke, The terminal portion protrudes in the axial direction from at least the second main surface of the plate portion, A stator, characterized in that one end of the winding is 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 fixed to an end surface of the yoke in the axial direction of the stator core, The terminal board has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first main surface located on the end face side of the yoke in the axial direction and a second main surface located on the opposite side to the end face of the yoke, The terminal portion protrudes in the axial direction from at least the second main surface of the plate portion, One end of the winding is fixed in a wound state to the terminal portion, The end surface of the yoke and the first main surface of the plate portion are joined at a joint portion, the engagement portion is formed by engaging a convex portion protruding in the axial direction from one of the end surface of the yoke and the first main surface of the plate portion, and a concave portion recessed in the axial direction from the other of the end surface of the yoke and the first main surface of the plate portion, a stator comprising: a first main surface of the plate portion and a second main surface of the yoke portion; a first engaging portion of the first main surface of the plate portion;

3. 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 fixed to an end surface of the yoke in the axial direction of the stator core, The terminal board has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first main surface located on the end face side of the yoke in the axial direction and a second main surface located on the opposite side to the end face of the yoke, The terminal portion protrudes in the axial direction from at least the second main surface of the plate portion, One end of the winding is fixed in a wound state to the terminal portion, The end surface of the yoke and the first main surface of the plate portion are joined at a joint portion, the engagement portion is formed by engaging a convex portion protruding in the axial direction from one of the end surface of the yoke and the first main surface of the plate portion, and a concave portion recessed in the axial direction from the other of the end surface of the yoke and the first main surface of the plate portion, A stator characterized in that the engagement portion includes a first engagement portion and a second engagement portion located radially inward of the first engagement portion.

4. A stator core having an annular yoke extending in 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 fixed to an end surface of the yoke in the axial direction of the stator core, The terminal board has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first main surface located on the end face side of the yoke in the axial direction and a second main surface located on the opposite side to the end face of the yoke, The terminal portion protrudes in the axial direction from at least the second main surface of the plate portion, One end of the winding is fixed in a wound state to the terminal portion, The end surface of the yoke and the first main surface of the plate portion are joined at a joint portion, the engagement portion is formed by engaging a convex portion protruding in the axial direction from one of the end surface of the yoke and the first main surface of the plate portion, and a concave portion recessed in the axial direction from the other of the end surface of the yoke and the first main surface of the plate portion, The stator according to claim 1, wherein the mating portion overlaps the terminal portion in the axial direction.

5. 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 fixed to an end surface of the yoke in the axial direction of the stator core, The terminal board has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first main surface located on the end face side of the yoke in the axial direction and a second main surface located on the opposite side to the end face of the yoke, The terminal portion protrudes in the axial direction from at least the second main surface of the plate portion, One end of the winding is fixed in a wound state to the terminal portion, a recess that overlaps with the terminal portion in the axial direction is provided on the end surface of the yoke, A stator, wherein the terminal portion is spaced apart from a bottom surface of the recess in the axial direction.

6. 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 fixed to an end surface of the yoke in the axial direction of the stator core, The terminal board has a plate portion and a terminal portion fixed to the plate portion, the plate portion has a first main surface located on the end face side of the yoke in the axial direction and a second main surface located on the opposite side to the end face of the yoke, The terminal portion protrudes in the axial direction from at least the second main surface of the plate portion, One end of the winding is fixed in a wound state to the terminal portion, a stator including a terminal plate having an inner end that is not positioned more inward than an inner end of the yoke in the radial direction;

7. 7. The stator according to claim 1, wherein the end surface of the yoke and the first main surface of the plate portion are joined together at a joint portion.

8. 8. The stator according to claim 7, wherein the engagement portion is formed by engaging a convex portion protruding in the axial direction from one of the end face of the yoke and the first main surface of the plate portion, and a concave portion recessed in the axial direction from the other of the end face of the yoke and the first main surface of the plate portion.

9. The stator according to claim 8 , wherein the engagement portion overlaps with a peripheral edge of the end face of the yoke and a peripheral edge of the first main surface of the plate portion in the axial direction.

10. The stator according to claim 8 , wherein the engagement portion includes a first engagement portion and a second engagement portion located more inwardly than the first engagement portion in the radial direction.

11. The stator according to claim 10 , wherein the engagement portion further includes a third engagement portion that is located more inward than the first engagement portion in the radial direction and that is spaced apart from the second engagement portion in the circumferential direction.

12. 10. The stator according to claim 9, wherein the winding extends toward the terminal portion so as to contact the protruding portion at one end side.

13. The stator according to claim 8 , wherein the engagement portion overlaps with the terminal portion in the axial direction.

14. The protrusion is provided so as to protrude in the axial direction from the first main surface of the plate portion, The stator according to claim 13 , wherein the recess is recessed from the end face of the yoke in the axial direction.

15. The stator according to claim 7 , wherein the engagement portion is formed by engaging a recess recessed in the axial direction from the end face of the yoke with the plate portion.

16. a winding recess is provided on a periphery of the second main surface of the plate portion when viewed in the axial direction, 7. The stator according to claim 1, wherein one end of the winding extends toward the terminal portion so as to pass through the winding recess.

17. 7. The stator according to claim 1, wherein the end face of the yoke and the first main surface of the plate portion are joined together.

18. a recess that overlaps with the terminal portion in the axial direction is provided on the end surface of the yoke, The stator according to claim 1 , wherein the terminal portion is spaced apart from a bottom surface of the recess in the axial direction.

19. 7. The stator according to claim 1, wherein the terminal portion does not penetrate the plate portion in the axial direction.

20. 6. The stator according to claim 1, wherein an inner end of the terminal plate is not positioned further inward than an inner end of the yoke in the radial direction.

21. 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 6, 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.

22. The stator according to any one of claims 1 to 6, wherein the stator core is made of a powder magnetic core.

23. The stator according to any one of claims 1 to 6, wherein the terminal portion is made of a conductive material.

24. A stator according to any one of claims 1 to 6, a rotor provided opposite to an inner circumferential surface of the stator.

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