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

Technical Field

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

Background Art

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

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the electric motor described in Patent Document 1, a bus bar is used to electrically lead out the coil. As shown in FIG. 4 of Patent Document 1 and the like, the bus bar to which the coil is connected is fixed to the stator core by screwing. However, when the bus bar is fixed to the stator core by screwing, after the stator core is manufactured, additional processing for forming screw holes in the stator core is required, resulting in a decrease in manufacturing efficiency. Furthermore, since damage is caused to the stator core when forming the screw holes, the strength of the stator core decreases. Thus, in the electric motor described in Patent Document 1, there is room for improvement in realizing electrical lead-out of the coil while suppressing a decrease in manufacturing efficiency and a decrease in strength.

[0005] The present invention was made to solve the above problems and aims to provide a stator that enables electrical derivation of the coil while suppressing a decrease in manufacturing efficiency and a decrease in strength. Furthermore, the present invention aims to provide a motor having the above stator. [Means for solving the problem]

[0006] The stator of the present invention comprises a stator core made of a molded body of magnetic powder, having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, a coil made of windings wound around the teeth, and a terminal plate 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 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 of 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, and one end of the windings is fixed in a state of being wrapped around the terminal portion.

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

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

[0009] [Figure 1] Figure 1 is a schematic perspective view showing an example of a stator according to Embodiment 1 of the present invention. [Figure 2] Figure 2 is a schematic perspective view showing the coil unit in Figure 1. [Figure 3]Figure 3 is a schematic perspective view showing the divided core in Figure 2. [Figure 4] Figure 4 is a schematic perspective view showing an example of the disassembled state of the split core and terminal board in Figure 2. [Figure 5] Figure 5 is a schematic perspective view showing a coil unit that constitutes an example of a stator in a modified example 1 of Embodiment 1 of the present invention. [Figure 6] Figure 6 is a schematic perspective view showing an example of the disassembled state of the split core and terminal board in Figure 5. [Figure 7] Figure 7 is a schematic perspective view showing a coil unit that constitutes an example of a stator in a modified example 2 of Embodiment 1 of the present invention. [Figure 8] Figure 8 is a schematic perspective view showing an example of the disassembled state of the split core and terminal board in Figure 7. [Figure 9] Figure 9 is a schematic perspective view showing a coil unit that constitutes an example of a stator in Modification 3 of Embodiment 1 of the present invention. [Figure 10] Figure 10 is a schematic perspective view showing the disassembled state of the split core and terminal board in Figure 9. [Figure 11] Figure 11 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 2 of the present invention. [Figure 12] Figure 12 is a schematic perspective view showing an example of the disassembled state of the split core and terminal board in Figure 11. [Figure 13] Figure 13 is a schematic cross-sectional diagram showing an example of a cross-section along line segment a1-a2 of the coil unit (excluding the windings) shown in Figure 11. [Figure 14] Figure 14 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 3 of the present invention. [Figure 15] Figure 15 is a schematic perspective view showing the disassembled state of the split core and terminal board in Figure 14. [Figure 16] Figure 16 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 4 of the present invention. [Figure 17]FIG. 17 is a perspective schematic view showing an example of a state in which the split core and the terminal board in FIG. 16 are disassembled. [Figure 18] FIG. 18 is a perspective schematic view showing a coil unit constituting an example of a stator according to Embodiment 5 of the present invention. [Figure 19] FIG. 19 is a perspective schematic view showing an example of a state in which the split core and the terminal board in FIG. 18 are disassembled. [Figure 20] FIG. 20 is a cross-sectional schematic view showing an example of a cross-section along line segment b1-b2 of the coil unit (excluding windings) shown in FIG. 18. [Figure 21] FIG. 21 is a perspective schematic view showing a coil unit constituting an example of a stator according to Embodiment 6 of the present invention. [Figure 22] FIG. 22 is a perspective schematic view showing an example of a state in which the split core and the terminal board in FIG. 21 are disassembled. [Figure 23] FIG. 23 is a cross-sectional schematic view showing an example of a cross-section along line segment c1-c2 of the coil unit shown in FIG. 21. [Figure 24] FIG. 24 is a cross-sectional schematic view showing another example of a cross-section along line segment c1-c2 of the coil unit shown in FIG. 21. [Figure 25] FIG. 25 is a perspective schematic view showing an example of a stator according to Embodiment 7 of the present invention. [Figure 26] FIG. 26 is a perspective schematic view showing the coil unit in FIG. 25. [Figure 27] FIG. 27 is a perspective schematic view showing an example of a motor according to Embodiment 8 of the present invention. [Figure 28] FIG. 28 is a perspective schematic view showing an example of a motor according to Embodiment 9 of the present invention.

Embodiments for Carrying Out the Invention

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

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

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

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

[0014] [Stata] The stator of the present invention comprises a stator core made of a molded body of magnetic powder, having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, a coil made of windings wound around the teeth, and a terminal plate 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 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 of 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, and one end of the windings is fixed in a state of being wrapped around the terminal portion.

[0015] <Embodiment 1> An example of the stator of the present invention will be described as the stator of Embodiment 1 of the present invention.

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

[0017] The stator 20A shown in Figure 1 has a stator core 30A, a plurality of coils 40A, and a plurality of terminal boards 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 surface of the yoke when viewed from the axial direction is defined as the circumferential direction. Furthermore, the direction perpendicular to the axial direction and in which the outer and inner surfaces of the yoke are opposite each other is defined as the radial direction.

[0020] The yoke 31 is an annular shape that follows the circumferential direction.

[0021] The multiple teeth 32 each independently protrude radially from the inner circumferential surface of the yoke 31, spaced apart from one another in the circumferential direction. In this way, the multiple teeth 32 are integrated with the yoke 31.

[0022] The stator core 30A is made of a molded magnetic powder. In other words, the yoke 31 and teeth 32 of the stator core 30A are integrally formed from a molded magnetic powder.

[0023] In the stator of the present invention, it is preferable that the stator core is made of a compacted magnetic core.

[0024] In the stator 20A, the stator core 30A is preferably made of a compacted magnetic core. In other words, the yoke 31 and teeth 32 of the stator core 30A are preferably made of a compacted magnetic core integrated into one unit.

[0025] The stator core 30A may be made of a molded body of a composite material containing magnetic powder and resin, rather than a compacted magnetic core.

[0026] Each of the multiple coils 40A consists of a winding 41 wound around a tooth 32. The multiple coils 40A are provided independently on the tooth 32 so as to be spaced apart from each other in the circumferential direction.

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

[0028] Multiple coils 40A, for example in the case of a three-phase system, include a coil composed of a U-phase winding, a coil composed of a V-phase winding, and a coil composed of a W-phase winding. In this case, the U-phase winding, the V-phase winding, and the W-phase winding are connected in a star or delta configuration.

[0029] Examples of winding wire 41 include polyurethane copper wire (UEW).

[0030] Each of the multiple terminal boards 50A is fixed to the end face 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 face 31a side of the yoke 31 in the axial direction, and a second main surface 51b located on the opposite side of the end face 31a of the yoke 31.

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

[0034] Examples of insulating materials that constitute the plate portion 51 include resins such as polyphenylene sulfide (PPS).

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

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

[0037] Terminal portions 52a and 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, it is preferable that the terminal portions 52a and 52b are made of a conductive material. In this case, one end 41a of the winding 41 and the terminal of the connection board described later can be easily connected via the terminal portion 52a. Also, the other end 41b of the winding 41 and the terminal of the connection board described later can be easily connected via the terminal portion 52b.

[0040] Examples of conductive materials that constitute 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, since there is no need to consider insulation between the terminal portion 52a and the stator core 30A, and furthermore, insulation between the terminal portion 52b and the stator core 30A, the terminal portions 52a and 52b can be easily fixed to the plate portion 51. In addition, the terminal plate 50A can be easily manufactured by integrally molding the terminal portions 52a and 52b with the plate portion 51.

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

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

[0044] Examples of the three-dimensional shapes of terminal portions 52a and 52b include cylindrical and prismatic shapes.

[0045] The three-dimensional shapes of terminal portions 52a and 52b are preferably the same, but they may be different.

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

[0047] It is preferable that the terminal plate 50A is fixed to the end face 31a of the yoke 31 via an insulating member (not shown). In other words, it is preferable that an insulating member is interposed between the end face 31a of the yoke 31 and the first main surface 51a of the plate portion 51. In this case, insulation between the yoke 31 and the terminal plate 50A, in particular insulation between the yoke 31 and the terminal portion 52a, and insulation between the yoke 31 and the terminal portion 52b, is ensured.

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

[0049] If the end face 31a of the yoke 31 is covered with an insulating film, it is preferable that the entire surface of the stator core 30A is covered with an insulating film. However, if the end face 31a of the yoke 31 is covered with an insulating film, the entire surface of the stator core 30A does not need to be covered.

[0050] When the first main surface 51a of the plate portion 51 is covered with an insulating film, it is preferable that the entire surface of the plate portion 51 is covered with the insulating film. However, when the first main surface 51a of the plate portion 51 is covered with an insulating film, the entire surface of the plate portion 51 does not need to be covered.

[0051] A method for covering 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 includes, for example, a method of coating the target surface with an insulating material by a painting method such as electrodeposition coating.

[0052] The insulating member may be an insulating sheet pre-formed from an insulating material. In this case, the insulating sheet is at least placed between the end face 31a of the yoke 31 and the first main surface 51a of the plate portion 51.

[0053] As described above, if the plate portion 51 is made of an insulating material, the first main surface 51a of the plate portion 51 does not need to be covered with an insulating film. However, for example, if the terminal portions 52a and 52b are exposed from the first main surface 51a of the plate portion 51, as will be described later, it is preferable that the exposed portions of the terminal portions 52a and 52b that are exposed from the first main surface 51a of the plate portion 51 are covered with an insulating film.

[0054] One end 41a of the winding 41 is fixed in place, wrapped around the terminal portion 52a. This allows one end 41a of the winding 41 to be led out to the terminal board 50A.

[0055] One end 41a of the winding 41 may be wrapped around the terminal portion 52a and then fixed to the terminal portion 52a by soldering or the like. Alternatively, one end 41a of the winding 41 may be wrapped around the terminal portion 52a and then fixed to the terminal portion 52a and the terminal of the wiring board described later by soldering or the like.

[0056] Preferably, the other end 41b of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52b. In this case, the other end 41b of the winding 41 is led out to the terminal board 50A.

[0057] The other end 41b of the winding 41 may be wrapped around the terminal portion 52b and then fixed to the terminal portion 52b by soldering or the like. Alternatively, the other end 41b of the winding 41 may be wrapped around the terminal portion 52b and then fixed to the terminal portion 52b and the terminal of the wiring board described later by soldering or the like.

[0058] In the stator 20A, there is only one coil 40A in which one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, and it is preferable that for all coils 40A, one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a.

[0059] In the stator 20A, as shown in Figure 1, it is particularly preferable that for all coils 40A, one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, and the other end 41b of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52b.

[0060] In addition, in the stator 20A, as long as there is at least one coil 40A in which one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, there may be coils 40A in which one end 41a of the winding 41 is fixed in a state where it is wrapped around the terminal portion 52a, but the other end 41b of the winding 41 is not fixed in a state where it is wrapped around the terminal portion 52b, or there may be coils 40A in which both ends of the winding 41 are not fixed in a state where they are wrapped around the terminal portion.

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

[0063] During the manufacturing of the stator 20A, as described later, there is no need to perform additional processing on the molded stator core 30A in order to fix the terminal plate 50A to the end face 31a of the yoke 31. Therefore, the stator core 30A is not damaged during the manufacturing of the stator 20A, and as a result, the reduction in the strength of the stator 20A (more specifically, the stator core 30A) is suppressed.

[0064] Therefore, with stator 20A, it is possible to achieve electrical derivation of coil 40A while suppressing a decrease in manufacturing efficiency and strength.

[0065] Furthermore, in the stator 20A, since the fixing position of the terminal plate 50A is the end face 31a of the yoke 31, the presence of the terminal plate 50A does not reduce the space factor of the coil 40A (winding 41). This ensures the power density of the motor into which the stator 20A is incorporated.

[0066] In the following, as an example of the stator of the present invention, a stator in which a plurality of coil units are arranged in a ring in the circumferential direction will be given, and the manner in which the terminal plate 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 an annular shape in the circumferential direction, and each of the plurality of coil units may independently have a divided core formed by dividing the stator core in the circumferential direction, a coil, and a terminal plate.

[0068] The stator 20A shown in Figure 1 consists of multiple coil units 70A arranged in a ring shape in the circumferential direction.

[0069] Figure 2 is a schematic perspective view showing the coil unit in Figure 1. Figure 3 is a schematic perspective view showing the segmented core in Figure 2. Figure 4 is a schematic perspective view showing the segmented core and terminal board in Figure 2 in a disassembled state. Note that in Figure 4, the coil is not shown in order to make the structure of the segmented core and terminal board easier to understand. For the same reason, the coil is not shown in subsequent drawings showing the segmented core and terminal board in a disassembled state.

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

[0071] The divided core 80A is formed by dividing the stator core 30A in the circumferential direction. In other words, the stator core 30A is made up of multiple divided cores 80A arranged in a ring in the circumferential direction.

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

[0073] The divided yoke 81 is formed by dividing the yoke 31 in the circumferential direction.

[0074] The teeth 32 protrude radially from the inner circumferential surface of the segmented yoke 81. In this way, the teeth 32 are integrated with the segmented yoke 81.

[0075] The segmented core 80A is made of a molded magnetic powder. In other words, the segmented yoke 81 and teeth 32 of the segmented core 80A are integrally formed from a molded magnetic powder.

[0076] When viewed from the axial direction, the outer circumference of the segmented core 80A along the circumferential direction, that is, the outer circumference of the segmented yoke 81 along the circumferential direction, may be, for example, curved, straight, or a combination of curved and straight shapes. The configuration in which segmented yokes 81 having the shapes described above when viewed from the axial direction are arranged in the circumferential direction is included in the configuration in which the yoke 31 is annular along the circumferential direction.

[0077] In the divided core 80A, it is preferable that the teeth 32 are thinner on the side of the divided yoke 81 than on the side opposite to the divided yoke 81 in at least one direction, either axially or circumferentially. In the example shown in Figure 3, the teeth 32 are thinner on the side of the divided yoke 81 than on the side opposite to the divided yoke 81 in the circumferential direction.

[0078] In other words, in a stator core 30A in which multiple segmented cores 80A are arranged in an annular shape in the circumferential direction, it is preferable that the teeth 32 are thinner on the yoke 31 side than on the opposite side of the yoke 31 in at least one direction, both axially and circumferentially.

[0079] If the side of tooth 32 facing yoke 31 (the side facing split yoke 81) is thinner than the side facing yoke 31 (the side facing split yoke 81), the number of turns of coil 40A can be increased by using that thinner portion as the winding axis of coil 40A. As a result, in a motor incorporating stator 20A, the magnetic flux passing through coil 40A tends to increase, making it easier to improve the motor's output torque.

[0080] Coil 40A is located on teeth 32 of the split core 80A.

[0081] The terminal board 50A is fixed to the end face 81a of the divided yoke 81 of the divided core 80A in the axial direction.

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

[0083] Terminal portions 52a and 52b penetrate the plate portion 51 in the axial direction and are exposed from the first main surface 51a of the plate portion 51.

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

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

[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 mated together at a mating portion. In this case, the mating portion may consist of a convex portion that protrudes 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 that is 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 Figures 3 and 4, the divided yoke 81 of the divided core 80A is provided with recesses 86b and 86c that are recessed in the axial direction from the end face 81a.

[0088] The recesses 86b and 86c are provided on the periphery of the end face 81a of the divided yoke 81. More specifically, the recesses 86b and 86c are provided extending radially from the end face 81a of the divided yoke 81 to the inner circumferential surface of the divided yoke 81.

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

[0090] The three-dimensional shapes of recesses 86b and 86c may be the same or different.

[0091] As shown in Figure 4, the plate portion 51 of the terminal board 50A is provided with protrusions 55b and 55c that project axially from the first main surface 51a.

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

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

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

[0095] In the coil unit 70A, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked by an interlocking portion 90A, as shown in Figure 4. The interlocking portion 90A includes an interlocking portion 90ba formed by the interlocking of a recess 86b and a protrusion 55b, and an interlocking portion 90ca formed by the interlocking of a recess 86c and a protrusion 55c. In other words, in the coil unit 70A, the terminal plate 50A is fixed to the end face 81a of the divided yoke 81 by the interlocking of the recess 86b and the protrusion 55b, and by the interlocking of the recess 86c and the protrusion 55c.

[0096] As described above, in the coil unit 70A, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are mated together at the mating portion 90A, which makes it easier to fix the terminal plate 50A to the end face 81a of the divided yoke 81 and makes it easier to position the terminal plate 50A.

[0097] In the split core 80A, recesses 86b and 86c are provided on the end face 81a of the split yoke 81, but 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 in order to provide recesses 86b and 86c on the end face 81a of the split yoke 81. Therefore, the decrease in the manufacturing efficiency of the coil unit 70A is suppressed.

[0098] Furthermore, during the manufacturing of the coil unit 70A, the recesses 86b and 86c are formed on the end face 81a of the divided yoke 81, and since the divided core 80A is not damaged in this process, a decrease in the strength of the coil unit 70A (more specifically, the divided core 80A) is suppressed.

[0099] Therefore, in a stator 20A in which multiple coil units 70A are arranged in a ring in the circumferential direction, even if recesses 86b and 86c are provided, a decrease in manufacturing efficiency and a decrease in strength are suppressed.

[0100] In contrast, when the busbar is fixed to the stator core with screws, as in the electric motor described in Patent Document 1, additional processing is required to form screw holes in the stator core after it has been manufactured, which reduces manufacturing efficiency. Furthermore, the stator core is damaged when forming the screw holes, which reduces its strength. Moreover, if the stator core is made of a powdered magnetic core, it is difficult to form screw holes in the stator core at all because the powdered magnetic core is brittle.

[0101] The recesses 86b and 86c provided on the end face 81a of the divided yoke 81 function when engaging the first main surface 51a of the plate portion 51 with the end face 81a of the divided yoke 81, even if they are shallower than, for example, the screw holes described in Patent Document 1. Therefore, in the coil unit 70A, even if the recesses 86b and 86c are provided on the end face 81a of the divided yoke 81, the influence on the magnetic properties is minimized. Consequently, in the stator 20A in which a plurality of coil units 70A are arranged in an annular shape in the circumferential direction, the influence on the magnetic properties 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.

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

[0104] At the boundary between the end face 81a of the divided yoke 81 and the inner circumferential surface of the divided yoke 81, the roughness may increase during the manufacturing process of the divided core 80A, and burrs may be formed. Therefore, when one end 41a of the winding 41 is led out to the terminal portion 52a, if the winding 41 is in contact with the boundary between the end face 81a of the divided yoke 81 and the inner circumferential surface of the divided yoke 81 on the end 41a side, the insulating coating of the winding 41 may be damaged by the aforementioned burrs, etc.

[0105] In contrast, in the coil unit 70A shown in Figure 2, the winding 41 extends toward the terminal portion 52a such that it contacts the protrusion 55b at one end 41a. As a result, when one end 41a of the winding 41 is led out to the terminal portion 52a, the winding 41 can avoid the boundary between the end face 81a of the divided yoke 81 and the inner circumferential surface of the divided yoke 81 at one end 41a, thereby preventing damage to the insulating coating of the winding 41.

[0106] In the coil unit 70A shown in Figure 2, it is preferable that the winding 41 extends toward the terminal portion 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 portion 52b, the winding 41 can avoid the boundary between the end face 81a of the divided yoke 81 and the inner circumferential surface of the divided 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 the inner end of the terminal plate is not located inside the inner end of the yoke in the radial direction.

[0108] In the coil unit 70A shown in Figure 2, the inner end of the terminal plate 50A is not located inside the inner end of the split yoke 81 (more specifically, the end face 81a of the split yoke 81) in the radial direction. In this case, compared to the case where the inner end of the terminal plate 50A is located inside the inner end of the split yoke 81 in the radial direction, it becomes easier to wrap one end 41a of the winding 41 around the terminal portion 52a, and furthermore, it becomes easier to wrap the other end 41b of the winding 41 around the terminal portion 52b.

[0109] In the coil unit 70A, in a configuration where the inner end of the terminal plate 50A is not located inside the inner end of the divided yoke 81 in the radial direction, the inner end of the terminal plate 50A may be located at the same position as the inner end of the divided yoke 81 in the radial direction, as shown in Figure 2, or it 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 inward, at the same position as, or outward from the outer end of the divided yoke 81 (more specifically, the end face 81a of the divided yoke 81).

[0111] In the coil unit 70A, as shown in Figure 2, it is preferable that the outer end of the terminal plate 50A is not located outside the outer end of the divided yoke 81 (more specifically, the end face 81a of the divided yoke 81) in the circumferential direction. In this case, compared to the case where the outer end of the terminal plate 50A is located outside the outer end of the divided yoke 81 in the circumferential direction, it becomes easier to arrange multiple coil units 70A in a ring shape in the circumferential direction without interfering with each other during the manufacturing of the stator 20A.

[0112] In the coil unit 70A, in a configuration where the outer end of the terminal plate 50A is not located outside the outer end of the divided yoke 81 in the circumferential direction, the outer end of the terminal plate 50A may be located at the same position as the outer end of the divided yoke 81, as shown in Figure 2, or it may be located inside it.

[0113] In the stator of the present invention, the mating portion that mats the end face of the yoke with the first main surface of the plate portion is not limited to the configuration shown in Figure 4. Other configurations of the mating portion that mats the end face of the yoke with the first main surface of the plate portion will be described below with reference to other embodiments.

[0114] <Modification 1 of Embodiment 1> Figure 5 is a schematic perspective view showing a coil unit that constitutes an example of a stator in Modification 1 of Embodiment 1 of the present invention. Figure 6 is a schematic perspective view showing the divided core and terminal board in Figure 5 in a disassembled state.

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

[0116] As shown in Figure 6, the divided yoke 81 of the divided core 80B is provided with protrusions 85b and 85c that project axially from the end face 81a.

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

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

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

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

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

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

[0123] The three-dimensional shapes of recesses 56b and 56c may be the same or different.

[0124] In the coil unit 70B, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked by an interlocking portion 90B, as shown in Figure 6. The interlocking portion 90B includes an interlocking portion 90bb formed by the interlocking of a convex portion 85b and a concave portion 56b, and an interlocking portion 90cb formed by the interlocking of a convex portion 85c and a concave portion 56c. In other words, in the coil unit 70B, the terminal plate 50B is fixed to the end face 81a of the divided yoke 81 by the interlocking of the convex portion 85b and the concave portion 56b, and by the interlocking 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 divided yoke 81 and the first main surface 51a of the plate portion 51 are mated together at the mating portion 90B, which makes it easier to fix the terminal plate 50B to the end face 81a of the divided yoke 81 and makes it easier to position the terminal plate 50B.

[0126] In the segmented core 80B, protrusions 85b and 85c are provided on the end face 81a of the segmented yoke 81, but the protrusions 85b and 85c are formed simultaneously with the molding of the segmented core 80B. In other words, when manufacturing the coil unit 70B, there is no need to perform additional processing on the segmented core 80B after molding in order to provide the protrusions 85b and 85c on the end face 81a of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70B is suppressed, and furthermore, the decrease in strength of the coil unit 70B (more specifically, the segmented core 80B) is suppressed.

[0127] <Modification 2 of Embodiment 1> Figure 7 is a schematic perspective view showing a coil unit that constitutes an example of a stator in a modified example 2 of Embodiment 1 of the present invention. Figure 8 is a schematic perspective view showing the divided core and terminal board in Figure 7 in a disassembled state.

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

[0129] As shown in Figure 8, the divided yoke 81 of the divided core 80C is provided with a protrusion 85a that projects axially from the end face 81a. Furthermore, the divided yoke 81 of the divided core 80C is provided with recesses 86b and 86c that are recessed axially from the end face 81a.

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

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

[0132] The recess 86b is located outward from the protrusion 85a in the circumferential direction. Furthermore, the recess 86b is located inward from the protrusion 85a in the radial direction. Additionally, the recess 86b is separated from the recess 86c in the circumferential direction.

[0133] The recess 86c is located outward from the protrusion 85a in the circumferential direction. Furthermore, the recess 86c is located inward from the protrusion 85a in the radial direction.

[0134] The three-dimensional shapes of recesses 86b and 86c may be the same or different.

[0135] As shown in Figure 8, the plate portion 51 of the terminal plate 50C is provided with a recess 56a that is recessed in the axial direction from the first main surface 51a. Furthermore, the plate portion 51 of the terminal plate 50C is provided with protrusions 55b and 55c that project in the axial direction from the first main surface 51a.

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

[0137] The recess 56a is located inward in the circumferential direction compared to the protrusions 55b and 55c. Furthermore, the recess 56a is located outward in the radial direction compared to the protrusions 55b and 55c.

[0138] The protrusion 55b is located outward from the recess 56a in the circumferential direction. Furthermore, the protrusion 55b is located inward from the recess 56a in the radial direction. Additionally, the protrusion 55b is spaced apart from the protrusion 55c in the circumferential direction.

[0139] The protrusion 55c is located outward from the recess 56a in the circumferential direction. Furthermore, the protrusion 55c is located inward from the recess 56a in the radial direction.

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

[0141] In the coil unit 70C, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked by an interlocking portion 90C, as shown in Figure 8. The interlocking portion 90C includes an interlocking portion 90ab formed by the interlocking of a convex portion 85a and a concave portion 56a, an interlocking portion 90ba formed by the interlocking of a concave portion 86b and a convex portion 55b, and an interlocking portion 90ca formed by the interlocking of a concave portion 86c and a convex portion 55c. In other words, in the coil unit 70C, the terminal plate 50C is fixed to the end face 81a of the divided yoke 81 by the interlocking of the convex portion 85a and the concave portion 56a, the interlocking of the concave portion 86b and the convex portion 55b, and the interlocking of the concave portion 86c and the convex portion 55c.

[0142] As described above, in the coil unit 70C, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are mated together at the mating portion 90C, which makes it easier to fix the terminal plate 50C to the end face 81a of the divided yoke 81 and makes it easier to position the terminal plate 50C.

[0143] In the segmented core 80C, a protrusion 85a, a recess 86b, and a recess 86c are provided on the end face 81a of the segmented yoke 81, but the protrusion 85a, the recess 86b, and the recess 86c are formed simultaneously with the molding of the segmented core 80C. In other words, when manufacturing the coil unit 70C, there is no need to perform additional processing on the segmented core 80C after molding in order to provide the protrusion 85a, the recess 86b, and the recess 86c on the end face 81a of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70C is suppressed, and furthermore, the decrease in strength of the coil unit 70C (more specifically, the segmented core 80C) is suppressed.

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

[0145] In Figure 8, the mating portion 90C, specifically mating portions 90ab, 90ba, and 90ca, overlap in the axial direction with the periphery of the end face 81a of the divided yoke 81 and the periphery of the first main surface 51a of the plate portion 51.

[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 inward from the first mating portion in the radial direction.

[0147] The mating portion 90C shown in Figure 8 includes a mating portion 90ab and a mating portion 90ba or mating portion 90ca located radially inward from the mating portion 90ab. In other words, in the mating portion 90C, the mating portion 90ab corresponds to the first mating portion, and the mating portion 90ba or mating portion 90ca corresponds to the second mating portion. In this way, the mating portions that fit the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are provided separately so as to be radially separated, making it difficult for the terminal plate 50C to shift away from the end face 81a of the divided yoke 81.

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

[0149] The mating portion 90C shown in Figure 8 includes mating portions 90ba and 90ca, which are located inside the mating portion 90ab in the radial direction and are separated from each other in the circumferential direction. In other words, in the mating portion 90C, the mating portion 90ab corresponds to the first mating portion, one of the mating portions 90ba and 90ca corresponds to the second mating portion, and the other of the mating portions 90ba and 90ca corresponds to the third mating portion. In this way, the mating portions that fit the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are provided separately so as to be separated in the radial and circumferential directions, making it very difficult for the terminal plate 50C to shift away from the end face 81a of the divided yoke 81.

[0150] Figure 8 illustrates an example in which three interlocking parts are provided in one set of divided yokes 81 and plate sections 51, but the total number of interlocking parts is not particularly limited. In other words, one set of divided yokes 81 and plate sections 51 may have one interlocking part or multiple interlocking parts.

[0151] Figure 8 illustrates an example in which a pair of divided yokes 81 and plate portions 51 have one mating portion on the radially outer side and two mating portions on the radially inner side. However, the number of mating portions on the radially outer and inner sides is not particularly limited. For example, a pair of divided 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 in a pair of divided yokes 81 and plate portions 51 may be the same on the radially outer and inner sides, or they may be different. Furthermore, a pair of divided yokes 81 and plate portions 51 may not have mating portions on either the radially outer or inner side.

[0152] Figure 8 illustrates an example in which the mating portion that fits the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 is provided to be spaced radially apart. However, the mating portion does not have to be provided to be spaced radially apart.

[0153] Figure 8 illustrates an embodiment in which the mating portion that fits the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 is provided to be spaced apart in the circumferential direction. However, the mating portion does not have to be provided to be spaced apart in the circumferential direction.

[0154] <Modification 3 of Embodiment 1> Figure 9 is a schematic perspective view showing a coil unit that constitutes an example of a stator in Modification 3 of Embodiment 1 of the present invention. Figure 10 is a schematic perspective view showing the divided core and terminal board in Figure 9 in a disassembled state.

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

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

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

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

[0159] The recess 86b is located outward from the recess 86a in the circumferential direction. Furthermore, the recess 86b is located inward from the recess 86a in the radial direction. Additionally, the recess 86b is separated from the recess 86c in the circumferential direction.

[0160] The recess 86c is located outward from the recess 86a in the circumferential direction. Furthermore, the recess 86c is located inward from the recess 86a in the radial direction.

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

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

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

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

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

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

[0167] The three-dimensional shapes of the protrusions 55a, 55b, and 55c may be the same as each other, may be different from each other, or may be different in part.

[0168] In the coil unit 70D, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked by an interlocking portion 90D, as shown in Figure 10. The interlocking portion 90D includes an interlocking portion 90aa formed by the interlocking of a recess 86a and a protrusion 55a, an interlocking portion 90ba formed by the interlocking of a recess 86b and a protrusion 55b, and an interlocking portion 90ca formed by the interlocking of a recess 86c and a protrusion 55c. In other words, in the coil unit 70D, the terminal plate 50D is fixed to the end face 81a of the divided yoke 81 by the interlocking of the recess 86a and the protrusion 55a, the interlocking of the recess 86b and the protrusion 55b, and the interlocking of the recess 86c and the protrusion 55c.

[0169] As described above, in the coil unit 70D, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked at the interlocking portion 90D, which makes it easier to fix the terminal plate 50D to the end face 81a of the divided yoke 81 and makes it easier to position the terminal plate 50D.

[0170] In the split core 80D, recesses 86a, 86b, and 86c are provided on the end face 81a of the split yoke 81, but 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 split core 80D after molding in order to provide recesses 86a, 86b, and 86c on the end face 81a of the split yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70D is suppressed, and furthermore, the decrease in strength of the coil unit 70D (more specifically, the split core 80D) is suppressed.

[0171] In the stator of the present invention, the configuration of the mating portion that fits the end face of the yoke and the first main surface of the plate portion may be a configuration other than that of Embodiment 1, Modification 1 of Embodiment 1, Modification 2 of Embodiment 1, and Modification 3 of Embodiment 1 described above.

[0172] <Embodiment 2> In the stator of the present invention, the mating portion may overlap the terminal portion in the axial direction. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 2 of the present invention.

[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 provided so as to protrude in the axial direction from the first main surface of the plate portion, and the concave portion is provided so as to be recessed in the axial direction from the end surface of the yoke.

[0174] Figure 11 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 2 of the present invention. Figure 12 is a schematic perspective view showing the divided core and terminal board in Figure 11 in a disassembled state. Figure 13 is a schematic cross-sectional view showing an example of a cross-section along line segment a1-a2 of the coil unit (excluding the windings) shown in Figure 11.

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

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

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

[0178] The three-dimensional shapes of recesses 86d and 86e may be the same or different.

[0179] As shown in Figure 12, the plate portion 51 of the terminal board 50E is provided with protrusions 55d and 55e that project axially 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 convex portion 55d and the convex portion 55e may be the same or different from each other.

[0184] In the coil unit 70E, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked by an interlocking portion 90E, as shown in Figure 12. The interlocking portion 90E includes an interlocking portion 90da formed by the interlocking of a recess 86d and a protrusion 55d, and an interlocking portion 90ea formed by the interlocking of a recess 86e and a protrusion 55e. In other words, in the coil unit 70E, the terminal plate 50E is fixed to the end face 81a of the divided yoke 81 by the interlocking of the recess 86d and the protrusion 55d, and by the interlocking of the recess 86e and the protrusion 55e.

[0185] In the mating portion 90E, the recess 86d and the protrusion 55d overlap in the axial direction in the mating portion 90da, and the recess 86e and the protrusion 55e overlap in the axial direction in the mating portion 90ea. On the other hand, as described above, in the terminal plate 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, regarding the positional relationship between the mating portion 90E and the terminal plate 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 divided yoke 81 and the first main surface 51a of the plate portion 51 are mated together at the mating portion 90E, which makes it easier to fix the terminal plate 50E to the end face 81a of the divided yoke 81 and makes it easier to position the terminal plate 50E.

[0187] Thus, in the coil unit 70E, by utilizing only the two mating parts, mating part 90da and mating part 90ea, the terminal plate 50E can be fixed to the end face 81a of the split yoke 81, and the positioning of the terminal plate 50E becomes possible.

[0188] In the segmented core 80E, recesses 86d and 86e are provided on the end face 81a of the segmented yoke 81, but recesses 86d and 86e are formed simultaneously with the molding of the segmented core 80E. In other words, when manufacturing the coil unit 70E, there is no need to perform additional processing on the segmented core 80E after molding in order to provide recesses 86d and 86e on the end face 81a of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70E is suppressed, and furthermore, the decrease in strength of the coil unit 70E (more specifically, the segmented core 80E) is suppressed.

[0189] Furthermore, in the terminal plate 50E, a protrusion 55d is provided at a position that overlaps with the terminal portion 52a in the axial direction. Compared to the case where the protrusion 55d is not provided, it is possible to increase the axial dimension of the terminal portion 52a embedded in the plate portion 51, as shown in Figure 13. As a result, in the terminal plate 50E, the terminal portion 52a is firmly fixed to the plate portion 51. Since the terminal portion 52a, which is firmly fixed to the plate portion 51, is less likely to wobble, the work efficiency when wrapping one end 41a of the winding 41 around the terminal portion 52a is improved.

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

[0191] <Embodiment 3> In the stator of the present invention, the mating portion may be formed by mating a recess that is recessed in the axial direction from the end face of the yoke with the plate portion. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 3 of the present invention.

[0192] Figure 14 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 3 of the present invention. Figure 15 is a schematic perspective view showing the divided core and terminal board in Figure 14 in a disassembled state.

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

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

[0195] The recess 86f is provided radially, extending from the inner circumferential surface to the outer circumferential surface of the divided 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 place, wrapped around the terminal portion 52a. This allows one end 41a of the winding 41 to be led out to the terminal board 50F.

[0198] In the coil unit 70F, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked at the interlocking portion 90F, as shown in Figure 15. The interlocking portion 90F consists of an interlocking portion 90fa formed by interlocking a recess 86f provided on the end face 81a of the divided yoke 81 with the plate portion 51. In other words, in the coil unit 70F, the terminal plate 50F is fixed to the end face 81a of the divided yoke 81 by the interlocking of the recess 86f and the plate portion 51.

[0199] As described above, in the coil unit 70F, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked at the interlocking portion 90F, which makes it easier to fix the terminal plate 50F to the end face 81a of the divided yoke 81 and makes it easier to position the terminal plate 50F.

[0200] In the segmented core 80F, a recess 86f is provided on the end face 81a of the segmented yoke 81, but the recess 86f is formed simultaneously with the molding of the segmented core 80F. In other words, when manufacturing the coil unit 70F, there is no need to perform additional processing on the segmented core 80F after molding in order to provide the recess 86f on the end face 81a of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70F is suppressed, and furthermore, the decrease in strength of the coil unit 70F (more specifically, the segmented core 80F) is suppressed.

[0201] Furthermore, the recess 86f provided on the end face 81a of the divided yoke 81 functions when the first main surface 51a of the plate portion 51 and the end face 81a of the divided yoke 81 are engaged, even if it is shallower than, for example, the screw hole described in Patent Document 1. Therefore, in the coil unit 70F, even if the recess 86f is provided on the end face 81a of the divided yoke 81, the influence on the magnetic properties is minimized.

[0202] Furthermore, in the coil unit 70F, since the plate portion 51 is housed in the recess 86f, the overall axial dimensions of the coil unit are reduced compared to, for example, the coil unit 70A. In other words, the coil unit 70F can be made thinner (lower profile) in the axial direction.

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

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

[0205] Based on the above, in a stator in which multiple coil units 70F are arranged in a ring shape in the circumferential direction, it is possible to make the axial structure thinner (lower profile) while minimizing the impact 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 that the winding extends toward the terminal portion so as to pass through the winding recess at one end.

[0207] In the coil unit 70F shown in Figures 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 from 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. As a result, when one end 41a of the winding 41 is led out to the terminal portion 52a, the contact between the winding 41 and the boundary between the end face 81a (recess 86f) of the divided yoke 81 and the inner circumferential surface of the divided yoke 81 is mitigated, thereby suppressing the destruction of the insulating coating of the winding 41 by burrs that may be formed at the boundary between the end face 81a (recess 86f) of the divided yoke 81 and the inner circumferential surface of the divided 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 from the axial direction, and the winding may extend toward the terminal portion so as to pass through the winding recess at one end.

[0209] <Embodiment 4> 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 together. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 4 of the present invention.

[0210] Figure 16 is a schematic perspective view showing a coil unit that constitutes an example of a stator according to Embodiment 4 of the present invention. Figure 17 is a schematic perspective view showing the divided core and terminal board in Figure 16 in a disassembled state.

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

[0212] In the coil unit 70G, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are joined. In other words, the terminal plate 50G is fixed to the end face 81a of the divided yoke 81 by a joint (not shown).

[0213] Examples of joints include adhesives.

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

[0215] Thus, unlike the coil unit 70A and the like, the coil unit 70G has a simple structure that does not utilize a mating section, as shown in Figure 17, which allows the terminal plate 50G to be fixed to the end face 81a of the split yoke 81, and enables the positioning of the terminal plate 50G.

[0216] Furthermore, even in embodiments such as the coil unit 70A, where the terminal plate is fixed to the end face of the split yoke using the interlocking portion, the end face of the split yoke and the first main surface of the plate portion may be joined in addition to being interlocked.

[0217] <Embodiment 5> In the stator of the present invention, the end face of the yoke may be provided with a recess that overlaps the terminal portion in the axial direction, and the terminal portion may be spaced apart from the bottom surface of the recess in the axial direction. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 5 of the present invention.

[0218] Figure 18 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 5 of the present invention. Figure 19 is a schematic perspective view showing the divided core and terminal board in Figure 18 in a disassembled state. Figure 20 is a schematic cross-sectional view showing an example of a cross-section along line segment b1-b2 of the coil unit (excluding the windings) shown in Figure 18.

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

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

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

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

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

[0224] The terminal board 50A of the coil unit 70H has the same configuration as the terminal board 50A of the coil unit 70A. That is, as shown in Figure 19, the plate portion 51 of the terminal board 50A of the coil unit 70H is provided with protrusions 55b and 55c that project axially from the first main surface 51a.

[0225] In the coil unit 70H, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked at the interlocking portion 90A, as shown in Figure 19. This makes it easier to fix the terminal plate 50A to the end face 81a of the divided yoke 81 in the coil unit 70H, and facilitates the positioning of the terminal plate 50A.

[0226] In the coil unit 70H, with the terminal plate 50A fixed to the end face 81a of the split yoke 81, the recess 87a overlaps the terminal portion 52a in the axial direction. Furthermore, in the coil unit 70H, with the terminal plate 50A fixed to the end face 81a of the split yoke 81, as shown in Figure 20, the terminal portion 52a is separated from the bottom surface of the recess 87a in the axial direction. As a result, even if the terminal portion 52a is exposed from the first main surface 51a of the plate portion 51, or even if the terminal portion 52a protrudes axially from the first main surface 51a of the plate portion 51, the terminal portion 52a does not come into contact with the split yoke 81 while the terminal plate 50A is fixed to the end face 81a of the split yoke 81. Therefore, according to the structure shown in Figure 20, insulation between the split yoke 81 and the terminal portion 52a is ensured. Furthermore, according to the structure shown in Figure 20, when electrically connecting one end 41a of the winding 41 to the terminal of the connecting substrate, as will be described later, for example, when using solder joints, the heat generated during solder jointing is less likely to be transmitted from the terminal portion 52a to the split yoke 81. As a result, damage to the split core 80H is less likely to occur, thus suppressing a decrease in the strength of the coil unit 70H (more specifically, the split core 80H).

[0227] In the coil unit 70H, with the terminal plate 50A fixed to the end face 81a of the split yoke 81, the recess 87b overlaps the terminal portion 52b in the axial direction. Furthermore, in the coil unit 70H, with the terminal plate 50A fixed to the end face 81a of the split yoke 81, the terminal portion 52b is separated from the bottom surface of the recess 87b in the axial direction, similar to Figure 20.

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

[0229] In the segmented core 80H, recesses 87a and 87b are provided on the end face 81a of the segmented yoke 81, but recesses 87a and 87b are formed simultaneously with the molding of the segmented core 80H. In other words, when manufacturing the coil unit 70H, there is no need to perform additional processing on the segmented core 80H after molding in order to provide recesses 87a and 87b on the end face 81a of the segmented yoke 81. As a result, the decrease in manufacturing efficiency of the coil unit 70H is suppressed, and furthermore, the decrease in strength of the coil unit 70H (more specifically, the segmented core 80H) is suppressed.

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

[0231] <Embodiment 6> In the stator of the present invention, the terminal portion does not necessarily have to penetrate the plate portion in the axial direction. A stator that differs in this respect from the stator of Embodiment 1 of the present invention will be described below as the stator of Embodiment 6 of the present invention.

[0232] Figure 21 is a schematic perspective view showing a coil unit constituting an example of a stator according to Embodiment 6 of the present invention. Figure 22 is a schematic perspective view showing the divided core and terminal board in Figure 21 in a disassembled state. Figure 23 is a schematic cross-sectional view showing an example of a cross-section along the line segment c1-c2 of the coil unit shown in Figure 21.

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

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

[0235] 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 plate portion 51, as will be described later. In other words, as shown in Figure 22, the plate portion 51 of the terminal board 50J is provided with protrusions 55b and 55c that project axially from the first main surface 51a.

[0236] In the coil unit 70J, the end face 81a of the divided yoke 81 and the first main surface 51a of the plate portion 51 are interlocked at the interlocking portion 90A, as shown in Figure 22. This makes it easier to fix the terminal plate 50J to the end face 81a of the divided yoke 81 in the coil unit 70J, and makes it easier to position the terminal plate 50J.

[0237] In the coil unit 70J, as shown in Figure 23, the terminal portion 52a of the terminal plate 50J does not penetrate the plate portion 51 in the axial direction. In other words, in the terminal plate 50J, the terminal portion 52a is not exposed from the first main surface 51a of the plate portion 51. This makes it possible to have a structure in which the terminal portion 52a does not come into contact with the split yoke 81 when the terminal plate 50J is fixed to the end face 81a of the split yoke 81. Therefore, according to the structure shown in Figure 23, insulation between the split yoke 81 and the terminal portion 52a is ensured. Furthermore, according to the structure shown in Figure 23, when electrically connecting one end 41a of the winding 41 to the terminal of the connecting substrate, for example, when using solder joints, the heat generated during solder joints is less likely to be transferred 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 thus a decrease in the strength of the coil unit 70J (more specifically, the split core 80A) is suppressed.

[0238] In the coil unit 70J, similar to Figure 23, the terminal portion 52b of the terminal plate 50J does not penetrate the plate 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 acceptable 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 the terminal board 50J, if the terminal portion 52b does not penetrate the plate portion 51 in the axial direction, the terminal portion 52a may penetrate the plate portion 51 in the axial direction.

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

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

[0243] As shown in Figure 24, the bottom of the terminal portion 52a may be wider in the radial direction than the rest of the portion. Also, in the terminal plate 50J, the bottom of the terminal portion 52a may be wider in the circumferential direction than the rest of the portion. In other words, in the terminal plate 50J, the bottom of the terminal portion 52a may be wider in at least one direction, radially and circumferentially, than the rest of the portion. By having the bottom of the terminal portion 52a be wider in this way, the terminal portion 52a becomes less likely to come out of the plate portion 51 in the axial direction.

[0244] As shown in Figure 24, the terminal portion 52a may be spaced apart from the end face 81a of the split yoke 81 in the axial direction. In other words, 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 plate 50J can be fixed to the end face 81a of the split yoke 81, and the terminal portion 52a can be made to not come into contact with the split yoke 81. Therefore, according to the structure shown in Figure 24, insulation between the split yoke 81 and the terminal portion 52a is ensured. Furthermore, according to the structure shown in Figure 24, when electrically connecting one end 41a of the winding 41 to the terminal of the connecting substrate, for example, when using solder joints, the heat generated during solder joints is less likely to be transmitted from the terminal portion 52a to the split yoke 81, and as a result, damage to the split core 80A is less likely to occur, thus suppressing a decrease in the strength of the coil unit 70J (more specifically, the split core 80A).

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

[0246] <Embodiment 7> In the embodiments described above, the terminal board is shown to have two terminal portions. However, in the stator of the present invention, the terminal board may have only one terminal portion. In other words, in the stator of the present invention, only one end of the winding may be fixed in a state where it is wrapped around the terminal portion. A stator that differs in this respect from the stator of Embodiment 4 of the present invention will be described below as the stator of Embodiment 7 of the present invention.

[0247] Figure 25 is a schematic perspective view showing an example of a stator according to Embodiment 7 of the present invention. Figure 26 is a schematic perspective view showing the coil unit in Figure 25.

[0248] The stator 20K shown in Figure 25 has a coil unit 70K.

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

[0250] The split core 80G in coil unit 70K has the same configuration as the split core 80G in 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 fixed in place, wrapped around the terminal portion 52a. This allows one end 41a of the winding 41 to be led out to the terminal board 50K.

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

[0254] Furthermore, in other coil units such as coil unit 70A, the terminal board may have only one terminal section.

[0255] In the embodiments described above, the stator core was shown to be a segmented structure divided into segmented cores. However, in the stator of the present invention, the stator core may be an integrated structure that is not segmented.

[0256] In a stator with a segmented stator core, the coils 40A can be arranged more densely compared to a stator with a single-piece stator core, resulting in a greater number of coils 40A. Therefore, a stator with a segmented stator core makes it easier to improve the motor's characteristics compared to a stator with a single-piece stator core.

[0257] The stator of the present invention may be used not only as a component of a motor described later, but also, for example, as a component of a generator.

[0258] [motor] The motor of the present invention is characterized by comprising a stator of the present invention and a rotor provided opposite to the inner circumferential surface of the stator.

[0259] <Embodiment 8> An example of the motor of the present invention will be described as the motor of Embodiment 8 of the present invention.

[0260] Figure 27 is a schematic perspective view showing an example of a motor according to Embodiment 8 of the present invention.

[0261] The motor 1A shown in Figure 27 has a rotor 10A and a stator 20A.

[0262] In motor 1A, the rotor 10A is located coaxially on the inside of the axis AX, and the stator 20A is located coaxially on the outside. The axis AX corresponds to the rotation axis of the rotor 10A.

[0263] The rotor 10A is positioned opposite the inner circumferential 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 composed of, for example, a bulk soft magnetic material, an electromagnetic steel sheet, a compacted magnetic core, or a resin molded body containing a soft magnetic material.

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

[0267] Examples of materials used to construct the shaft 12 include metals such as stainless steel.

[0268] The direction in which the shaft 12 extends, that is, the direction in which the axis AX extends, is parallel to the axial direction.

[0269] The permanent magnets 13 are provided along the outer peripheral surface of the rotor yoke 11 such that the N poles and S poles alternate.

[0270] When viewed from the axial direction, the rotor 10A may be substantially circular or substantially polygonal.

[0271] In this embodiment, a motor having a stator 20A in which a plurality of coil units 70A are arranged annularly in the circumferential direction is shown, but the same applies to a motor having a stator in which other coil units such as the coil unit 70B are arranged annularly in the circumferential direction.

[0272] <Embodiment 9> The motor of the present invention may further include a connection substrate electrically connected to one end of the above winding. A motor in a different aspect from the motor of Embodiment 8 of the present invention in this regard will be described below as the motor of Embodiment 9 of the present invention.

[0273] FIG. 28 is a perspective schematic view showing an example of the motor of Embodiment 9 of the present invention.

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

[0275] The connection substrate 25A is electrically connected to one end 41a of the winding 41 of the coil 40A included in the stator 20A. Further, the connection substrate 25A is preferably electrically connected to the other end 41b of the winding 41 of the coil 40A included in the stator 20A. An example of this connection mode will be described below.

[0276] The connection substrate 25A is provided with a plurality of through holes 26 penetrating in the axial direction so as to be spaced apart from each other in the circumferential direction.

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

[0278] In motor 1B, the wiring board 25A is mounted on the stator 20A such that terminals 52a and 52b pass through separate through-holes 26. One end 41a of the winding 41 is fixed to terminal 52a with the winding wrapped around it, and the other end 41b of the winding 41 is fixed to terminal 52b with the winding wrapped around it. Therefore, as described above, with the wiring board 25A mounted on the stator 20A, it is possible to efficiently connect one end 41a of the winding 41 wrapped around terminal 52a and the other end 41b of the winding 41 wrapped around terminal 52b to terminals exposed from the inner wall surface of separate through-holes 26. Therefore, with motor 1B, electrical connection between one end 41a of winding 41 and the terminal of the connecting board 25A, and electrical connection between the other end 41b of winding 41 and the terminal of the connecting board 25A can be easily achieved.

[0279] This specification discloses the following:

[0280] <1> A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of windings wound around the teeth mentioned above, The stator core comprises a terminal plate fixed to the end face of the yoke in the axial direction, The above terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the axial direction, a first main surface located on the end face side of the yoke and a second main surface located on the opposite side of the end face of the yoke. The above-mentioned 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 state where it is wrapped around the terminal portion.

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

[0282] <3> The stator according to <2>, wherein the fitting portion is formed by fitting 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.

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

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

[0285] <6> The stator according to <5>, wherein the fitting portion further includes a third fitting portion located inside the first fitting portion in the radial direction and separated from the second fitting portion in the circumferential direction.

[0286] <> [[ID=]]The winding extends toward the terminal portion so as to contact the convex portion on one end side, the stator according to any one of <4> to <6>.

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

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

[0289] <10> The above-mentioned mating portion is formed by mating a recess that is recessed in the axial direction from the end face of the yoke with the plate portion. <2> The status listed.

[0290] <11> A winding recess is provided on the periphery of the second main surface of the plate portion when viewed from the axial direction. The winding extends toward the terminal portion so as to pass through the winding recess at one end. <1> ~ <10> The status listed in any of the following.

[0291] <12> The end face of the yoke and the first main surface of the plate are joined together. <1> ~ <11> The status listed in any of the following.

[0292] <13> The end face of the yoke is provided with a recess that overlaps the terminal portion in the axial direction. The above-mentioned terminal portion is separated from the bottom surface of the recess in the axial direction. <1> ~ <12> The status listed in any of the following.

[0293] <14> The above terminal portion does not penetrate the above plate portion in the axial direction. <1> ~ <13> The status listed in any of the following.

[0294] <15> In the radial direction described above, the inner end of the terminal plate is not located inside the inner end of the yoke. <1> ~ <14> The status listed in any of the following.

[0295] <16> Multiple coil units are arranged in a ring shape in the circumferential direction as described above. Each of the above-mentioned coil units independently comprises a divided core formed by dividing the stator core in the circumferential direction, the coil, and the terminal plate. <1> ~ <15> The status listed in any of the following.

[0296] <17> The stator core described above is composed of a compacted magnetic core. <1> ~ <16> The status listed in any of the following.

[0297] <18> The above terminal portion is made of a conductive material. <1> ~ <17> The status listed in any of the following.

[0298] <19> <1> ~ <18> The status listed in any of the following, A motor characterized by comprising a rotor provided opposite the inner circumferential surface of the stator described above.

[0299] <20> The winding further comprises a connection board electrically connected to one end of the winding. <19> The motor described above. [Explanation of Symbols]

[0300] 1A, 1B motors 10A Rotor 11 Rotor yoke 12 shafts 13 Permanent Magnets 20A, 20K stator 25A Wiring Board 26 Through-holes 30A stator core 31 York 31a End face of yoke 32 Teeth 40A coil 41 Winding 41a One end of the winding 41b The other end of the winding 50A, 50B, 50C, 50D, 50E, 50G, 50J, 50K terminal board 51 Board part 51a First main surface of the plate portion 51b Second main surface of the plate 52a, 52b terminal section 55a, 55b, 55c, 55d, 55e Protrusions on the plate portion 56a, 56b, 56c Recesses in the plate portion 57a Winding recess 70A, 70B, 70C, 70D, 70E, 70F, 70G, 70H, 70J, 70K, 71K Coil Unit 80A, 80B, 80C, 80D, 80E, 80F, 80G, 80H Split Core 81-part yoke 81a End face of the split yoke 85a, 85b, 85c Convex part of the divided yoke 86a, 86b, 86c, 86d, 86e, 86f Divided yoke recess 87a, 87b Recess in the divided yoke 88 Hollow 90A, 90B, 90C, 90D, 90E, 90F, 90aa, 90ab, 90ba, 90bb, 90ca, 90cb, 90da, 90ea, 90fa mating part AX axis

Claims

1. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The stator core comprises a terminal plate fixed to the end face of the yoke in the axial direction, and not extending from the end face 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, in the axial direction, a first main surface located on the end face side of the yoke and a second main surface located on the opposite side of 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 state where it is wrapped around the terminal portion.

2. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The stator core comprises a terminal plate fixed to the end face of the yoke in the axial direction, The terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the axial direction, a first main surface located on the end face side of the yoke and a second main surface located on the opposite side of 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 place, wrapped around the terminal portion. The end face of the yoke and the first main surface of the plate portion are joined together at the joint portion. The mating portion is formed by mating a convex portion that protrudes 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 that is recessed in the axial direction from the other end face of the yoke and the first main surface of the plate portion. The stator is characterized in that the mating portion overlaps the periphery of the end face of the yoke and the periphery of the first main surface of the plate portion in the axial direction.

3. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The stator core comprises a terminal plate fixed to the end face of the yoke in the axial direction, The terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the axial direction, a first main surface located on the end face side of the yoke and a second main surface located on the opposite side of 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 place, wrapped around the terminal portion. The end face of the yoke and the first main surface of the plate portion are joined together at the joint portion. The mating portion is formed by mating a convex portion that protrudes 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 that is recessed in the axial direction from the other end face of the yoke and the first main surface of the plate portion. The stator is characterized in that the mating portion includes a first mating portion and a second mating portion located inward from the first mating portion in the radial direction.

4. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The stator core comprises a terminal plate fixed to the end face of the yoke in the axial direction, The terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the axial direction, a first main surface located on the end face side of the yoke and a second main surface located on the opposite side of 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 place, wrapped around the terminal portion. The end face of the yoke and the first main surface of the plate portion are joined together at the joint portion. The mating portion is formed by mating a convex portion that protrudes 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 that is recessed in the axial direction from the other end face of the yoke and the first main surface of the plate portion. A stator characterized in that the mating portion overlaps the terminal portion in the axial direction.

5. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The stator core comprises a terminal plate fixed to the end face of the yoke in the axial direction, The terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the axial direction, a first main surface located on the end face side of the yoke and a second main surface located on the opposite side of 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 place, wrapped around the terminal portion. The end face of the yoke is provided with a recess that overlaps the terminal portion in the axial direction. The stator is characterized in that the terminal portion is spaced apart from the bottom surface of the recess in the axial direction.

6. A stator core having an annular yoke along the circumferential direction and teeth protruding radially from the inner circumferential surface of the yoke, and being made of a molded body of magnetic powder, A coil consisting of a winding wound around the aforementioned teeth, The stator core comprises a terminal plate fixed to the end face of the yoke in the axial direction, The terminal board has a plate portion and a terminal portion fixed to the plate portion. The plate portion has, in the axial direction, a first main surface located on the end face side of the yoke and a second main surface located on the opposite side of 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 place, wrapped around the terminal portion. A stator characterized in that, in the radial direction, the inner end of the terminal plate is not located inside the inner end of the yoke.

7. The stator according to claim 1, 5, or 6, wherein the end face of the yoke and the first main surface of the plate portion are mated together at a mating portion.

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

9. The stator according to claim 8, wherein the mating portion overlaps the periphery of the end face of the yoke and the periphery of the first main surface of the plate portion in the axial direction.

10. The stator according to claim 8, wherein the mating portion includes a first mating portion and a second mating portion located inward from the first mating portion in the radial direction.

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

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

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

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

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

16. A winding recess is provided on the periphery of the second main surface of the plate portion when viewed from the axial direction. The stator according to any one of claims 1 to 6, wherein the winding extends toward the terminal portion so as to pass through the winding recess at one end.

17. The stator according to any one of claims 1 to 6, wherein the end face of the yoke and the first main surface of the plate portion are joined together.

18. The end face of the yoke is provided with a recess that overlaps the terminal portion in the axial direction. The stator according to claim 1, 2, 3, 4, or 6, wherein the terminal portion is spaced apart from the bottom surface of the recess in the axial direction.

19. The stator according to any one of claims 1 to 6, wherein the terminal portion does not penetrate the plate portion in the axial direction.

20. The stator according to any one of claims 1 to 5, wherein in the radial direction, the inner end of the terminal plate is not located inside the inner end of the yoke.

21. Multiple coil units are arranged in a ring 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 comprises a divided 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 composed of a compacted 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 motor characterized by comprising a rotor provided opposite the inner circumferential surface of the stator.

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

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