Motor and electronic apparatus

Abstract

A motor (1) comprises: a stator (4) provided with a terminal (6); and a bus bar (5) provided to the stator (4) and having a hole (51H). A side surface of the hole (51H) of the bus bar (5) and a portion (602) of the terminal (6) are connected.

Description

Motors and Electronics

[0001] The present invention relates to a motor and an electronic device.

[0002] 2. Description of the Related Art A motor is known in which a coil and a terminal are electrically connected using a printed wiring board (see, for example, Patent Document 1).

[0003] Japanese Patent Application Laid-Open No. 2000-41371

[0004] However, conventional motors have room for improvement in terms of improving stability when a large current is passed through the coils during driving.

[0005] In one aspect, an object is to provide a motor and an electronic device that can improve stability when driven to pass a large current through the coil.

[0006] In one aspect, the motor comprises a stator having a terminal, and a bus bar having a hole provided in the stator, wherein a side surface of the hole of the bus bar is connected to a portion of the terminal.

[0007] According to one aspect, the motor can improve stability when driven to pass a large current through the coil.

[0008] FIG. 1 is a perspective view of an electronic device according to a first embodiment. FIG. 2 is a plan view of a motor included in the electronic device shown in FIG. 1. FIG. 3 is a perspective view of the motor shown in FIG. 2. FIG. 4 is a perspective view of a stator and terminals included in the motor shown in FIG. 2. FIG. 5 is an electrical circuit diagram of multiple coils included in the stator shown in FIG. 4. FIG. 6 is a wiring diagram of the multiple coils shown in FIG. 5. FIG. 7 is an exploded perspective view of multiple bus bars included in the motor shown in FIG. 2. FIG. 8 is a perspective view showing a second bus bar among the multiple bus bars shown in FIG. 7. FIG. 9 is an enlarged cross-sectional view showing bus bars and terminals included in the motor shown in FIG. 2. FIG. 10 is an enlarged cross-sectional view showing a state in which terminals are press-fitted into first hole portions of the bus bars shown in FIG. 9. FIG. 11 is a perspective view showing a state in which the first bus bar is supported by the terminals shown in FIG. 3. FIG. 12 is a perspective view showing a state in which the second bus bar is supported by the terminals shown in FIG. 3. FIG. 13 is a plan view of a motor included in an electronic device according to a second embodiment. FIG. 14 is a perspective view of the motor shown in FIG. 13. FIG. 15 is an electrical circuit diagram of the plurality of coils included in the stator shown in FIG. 14 . FIG. 16 is a wiring diagram of the plurality of coils shown in FIG. 15 . FIG. 17 is a perspective view showing a second bus bar among the plurality of bus bars. FIG. 18 is a perspective view showing a state in which the first bus bar is supported by the terminals shown in FIG. 14 . FIG. 19 is a perspective view showing a state in which the second bus bar is supported by the terminals shown in FIG. 14 . FIG. 20 is a plan view of a motor included in an electronic device according to a third embodiment. FIG. 21 is a perspective view of the motor shown in FIG. 20 . FIG. 22 is an electrical circuit diagram of the plurality of coils included in the stator shown in FIG. 21 . FIG. 23 is a wiring diagram of the plurality of coils shown in FIG. 22 . FIG. 24 is a perspective view showing a second bus bar among the plurality of bus bars. FIG. 25 is a perspective view showing a state in which the second bus bar is supported by the terminals shown in FIG. 21 .

[0009] [First embodiment] A motor 1 and an electronic device 100 according to an embodiment will be described in detail below with reference to the drawings. Note that the dimensional relationships and ratios of elements in the drawings may differ from the actual situation. The dimensional relationships and ratios may also differ between the drawings.

[0010] 1 is a perspective view of an electronic device 100 according to a first embodiment. The electronic device 100 is mounted on a vehicle such as an electric vehicle or a hybrid vehicle. The electronic device 100 includes, for example, a motor 1, a housing 101 that houses the motor 1, a first gear 102, and a second gear 103.

[0011] The first gear 102 is, for example, a worm gear, and rotates in conjunction with the shaft 2 of the motor 1. The second gear 103 is, for example, a helical gear that meshes with the first gear 102, and rotates in conjunction with the output shaft 104. With this configuration, the driving force of the shaft 2 of the motor 1 is transmitted to the output shaft 104 of the electronic device 100.

[0012] Next, the configuration of the motor 1 provided in the electronic device 100 will be described using Figures 1 to 4. Figure 2 is a plan view of the motor 1 provided in the electronic device 100 shown in Figure 1. Figure 3 is a perspective view of the motor 1 shown in Figure 2. Figure 4 is a perspective view of the stator 4 and terminals 6 provided in the motor 1 shown in Figure 2. Note that the rotor 3 is not shown in each figure except for Figure 2. Also, for ease of explanation, in the stator 4 shown in Figure 4, part of the core 40 is omitted, some of the multiple insulators 42 are omitted, and some of the multiple coils 43 are omitted.

[0013] In describing the motor 1 and electronic device 100 according to the embodiment, in order to facilitate understanding of directions, the direction in which the shaft 2 extends will be referred to as the axial direction A, the direction in which the rotor 3 rotates will be referred to as the circumferential direction C, and the direction contained in a plane perpendicular to the axial direction A, passing through the axis 2o of the shaft 2, and perpendicular to the circumferential direction C will be referred to as the radial direction R.

[0014] 1 according to this embodiment is an inner rotor type motor in which, when viewed from the axial direction A, the stator 4 is located outside the rotor 3 in the radial direction R, with the rotor 3 serving as the reference. The motor 1 is, for example, a three-phase motor (DC motor) electrically connected to a three-phase AC power supply.

[0015] The motor 1 according to this embodiment is an electric motor that converts, for example, electrical energy from a power source into a driving force that rotates the shaft 2 in the circumferential direction C.

[0016] As shown in Fig. 2, the motor 1 includes, for example, a shaft 2, a rotor 3, a stator 4, bus bars 5, terminals 6, and an insulator 7. The shaft 2 is a so-called rotating shaft, and is formed, for example, from a metal member in a cylindrical shape extending along an axial direction A. The shaft 2 has an axis 2o and is provided so as to be rotatable about the axis 2o. The shaft 2 transmits power to the outside by rotating in a circumferential direction C.

[0017] The rotor 3 is provided so as to be rotatable about an axis 2o of the shaft 2. In the motor 1 according to this embodiment, the shaft 2 and the rotor 3 are integrally formed.

[0018] The rotor 3 is disposed, for example, inside (on the shaft 2 side of) the stator 4 in the radial direction R. In other words, the motor 1 is an inner rotor type brushless motor in which the rotor 3 is located inside the stator 4 in the radial direction R.

[0019] The rotor 3 includes a yoke 31 as a magnetic body and a plurality of magnets 32. The yoke 31 is made of a magnetic material such as iron.

[0020] The magnets 32 are, for example, permanent magnets. The magnets 32 are arranged at predetermined intervals (for example, equal intervals) along the circumferential direction C. The rotor 3 according to this embodiment includes, for example, 14 magnets 32.

[0021] The stator 4 is a part that generates a force for rotating the rotor 3 in the circumferential direction C. As shown in Figures 3 and 4 , the stator 4 includes, for example, one core (annular part) 40, a plurality of teeth (magnetic pole parts) 41, a plurality of insulators 42, and a plurality of coils 43.

[0022] The core 40 is magnetic and is formed by stacking plate-shaped magnetic materials (metal members) such as silicon steel plates, electromagnetic steel plates, and soft magnetic steel plates in the axial direction A. The core 40 is formed in an annular shape when viewed from the axial direction A. In the stator 4 according to this embodiment, the core 40 and the teeth 41 are integrally formed.

[0023] Each of the teeth 41 is formed so as to protrude from the inner circumferential surface of the core 40 toward the rotor 3 in the radial direction R. The stator 4 according to this embodiment includes, for example, twelve teeth 41.

[0024] The insulators 42 are formed of, for example, insulating resin and are attached to the surfaces of the teeth 41 to ensure insulation between the teeth 41 and the coils 43. The stator 4 according to this embodiment includes, for example, twelve insulators 42.

[0025] The coils 43 are formed, for example, by winding wire around the teeth 41 via insulators 42. The winding wire has a conductive core wire (not shown) and an insulating coating portion (not shown) that covers the periphery of the core wire. The stator 4 according to this embodiment has, for example, 12 coils 43. Each of the coils 43 is electrically connected to the bus bar 5 via the terminal 6.

[0026] Next, the electrical connections of the multiple coils 43 in the motor 1 according to this embodiment will be described with reference to Figures 5 and 6. Figure 5 is an electrical circuit diagram of the multiple coils 43 provided in the stator 4 shown in Figure 4. Figure 6 is a wiring diagram of the multiple coils 43 shown in Figure 5.

[0027] The stator 4 includes a plurality of (four in this embodiment) first coils 43U that constitute the U phase of the motor 1, a plurality of (four in this embodiment) second coils 43V that constitute the V phase of the motor 1, and a plurality of (four in this embodiment) third coils 43W that constitute the W phase of the motor 1.

[0028] The U-phase of the motor 1 is formed by connecting four first coils 43U in parallel, the V-phase of the motor 1 is formed by connecting four second coils 43V in parallel, and the W-phase of the motor 1 is formed by connecting four third coils 43W in parallel.

[0029] The U-phase, V-phase, and W-phase of the motor 1 are electrically connected, for example, by star connection. Furthermore, the AC power supplies (not shown) connected to these coils 43 are electrically connected, for example, by star connection.

[0030] In the motor 1 according to this embodiment, as shown in FIG. 6, two wires entering the first bus bar 51 are gathered together at one location, thereby making it possible to reduce the number of terminals 6.

[0031] Next, the bus bars 5 of the motor 1 according to this embodiment will be described with reference to Figures 7, 8, 9, and 10. Figure 7 is an exploded perspective view of the plurality of bus bars 5 provided in the motor 1 shown in Figure 2. Figure 8 is a perspective view showing a second bus bar 52 of the plurality of bus bars 5 shown in Figure 7.

[0032] 7 is formed of, for example, a conductive metal. The bus bars 5 electrically connect one coil 43 to another coil 43, for example, via terminals 6. The cross-sectional area of ​​the bus bars 5 is relatively large, and even when the motor 1 is running, deformation due to heat generation is minimal, allowing a large current to flow stably.

[0033] The multiple bus bars 5 include a first bus bar 51 located on one side of the insulator 7 in the axial direction A and a second bus bar 52 located on the other side of the insulator 7 in the axial direction A. In other words, the insulator 7 is disposed between the first bus bar 51 and the second bus bar 52 in the axial direction A.

[0034] The first bus bar 51 electrically connects the first coil 43U constituting the U phase to the neutral point NP via the terminal 6, electrically connects the second coil 43V constituting the V phase to the neutral point NP via the terminal 6, and electrically connects the third coil 43W constituting the W phase to the neutral point NP via the terminal 6 (see Figure 5).

[0035] The first bus bar 51 has a main body 51a extending in the circumferential direction C and a protruding portion 51b protruding outward in the radial direction R from the main body 51a.

[0036] The second bus bar 52 is electrically connected to each of the coils 43 constituting the U-phase, V-phase, and W-phase via the terminals 6 .

[0037] The second bus bar 52 has a first shape 521, a second shape 522, and a third shape 523 that are different from one another.

[0038] The first shape 521 has a main body 521a extending in the circumferential direction C, a protruding portion 521b protruding outward from the main body 521a in the radial direction R, and an external connection terminal 521c protruding from the main body 521a toward the other side in the axial direction A. The main body 521a of the first shape 521 also has, in the axial direction A, a low portion 21L, a portion 21H that is higher than the low portion 21L, and a step portion 21S between the low portion 21L and the high portion 21H.

[0039] The second shape 522 has a main body 522a extending in the circumferential direction C, a protruding portion 522b protruding outward from the main body 522a in the radial direction R, and an external connection terminal 522c protruding from the main body 522a toward the other side in the axial direction A. The main body 522a of the second shape 522 also has, in the axial direction A, a low portion 22L and a portion 22H that is higher than the low portion 22L.

[0040] The third shape 523 has a main body 523a extending in the circumferential direction C, a protruding portion 523b protruding outward from the main body 523a in the radial direction R, and an external connection terminal 523c protruding from the main body 523a toward the other side in the axial direction A. The main body 523a of the third shape 523 also has, in the axial direction A, a low portion 23L, a portion 23H that is higher than the low portion 23L, and a step portion 23S between the low portion 23L and the high portion 23H.

[0041] 7 and 8, a hole 5H is formed in each of the protrusions 51b, 521b, 522b, and 523b, penetrating the side surfaces of the protrusions 51b, 521b, 522b, and 523b in the axial direction A. The hole 5H opens in the axial direction A and forms, for example, a periphery (inner periphery) of the protrusions 51b, 521b, 522b, and 523b when viewed from the axial direction A. Note that, hereinafter, the hole will be referred to as penetrating the side surface of a predetermined member and forming a periphery (inner periphery) of the predetermined member.

[0042] The holes 5H include first holes 51H through which the terminals 6 are inserted and second holes 52H through which pins 7P (see FIG. 3 ) for holding the bus bars 5 in the insulator 7 are inserted. When viewed from the axial direction A, as shown in FIG. 2 , the size (diameter) of the second holes 52H is larger than the size (diameter) of the first holes 51H, and the second holes 52H are formed to have different sizes.

[0043] The thickness of the busbar 5 in the axial direction A is relatively large. Therefore, compared to when a flexible printed circuit board is used, it is possible to reduce the electrical resistance at the contact points between the side surfaces of the hole 5H of the busbar 5 and the terminals 6. Furthermore, because the busbar 5 is in direct contact with the terminals 6, there is no need to use other parts, and the number of parts can be reduced.

[0044] As shown in Figure 8, the first shape 521 and the second shape 522 are positioned to overlap in the axial direction A, the second shape 522 and the third shape 523 are positioned to overlap in the axial direction A, and the third shape 523 and the first shape 521 are positioned to overlap in the axial direction A.

[0045] Next, the overlapping of the first shape 521, the second shape 522, and the third shape 523 in the axial direction A will be described with reference to FIG.

[0046] In the axial direction A, the high portion 21H of the first shape 521 overlaps with the low portion 22L of the second shape 522. Note that the high portion 22H of the second shape 522 may also overlap with the low portion 21L of the first shape 521.

[0047] In the axial direction A, the high portion 22H of the second shape 522 overlaps with the low portion 23L of the third shape 523. Note that the high portion 23H of the third shape 523 may also overlap with the low portion 22L of the second shape 522.

[0048] In the axial direction A, the high portion 23H of the third shape 523 overlaps with the low portion 21L of the first shape 521. Note that the high portion 21H of the first shape 521 may also overlap with the low portion 23L of the third shape 523.

[0049] Next, the terminal 6 will be described with reference to Figures 9 and 10. Figure 9 is an enlarged cross-sectional view showing the bus bar 5 and the terminal 6 provided in the motor 1 shown in Figure 2. Figure 10 is an enlarged cross-sectional view showing the terminal 6 press-fitted into the first hole 51H of the bus bar 5 shown in Figure 9.

[0050] The terminal 6 is made of, for example, a conductive metal material, and is formed to extend in the axial direction A. One side in the axial direction A is electrically connected to one of the coils 43, while the other side in the axial direction A is electrically connected to one of the bus bars 5. The terminal 6 is a so-called press-fit terminal. The terminal 6 and the coil 43 are electrically connected by welding.

[0051] The terminal 6 has a main body 601 and a connection portion 602 formed on the other side of the main body 601 in the axial direction A and electrically connected to the bus bar 5. The connection portion 602 extends in the axial direction A.

[0052] The connecting portion 602 has two protrusions 602a arranged adjacent to the other side of the main body portion 601 in the axial direction A, and a deformable portion 602b arranged adjacent to the other side of the protrusions 602a in the axial direction A.

[0053] The pair of protrusions 602a protrude from the main body 601 so as to be separated from each other in the circumferential direction C. The tip (end) of the deformable portion 602b is formed in a shape that tapers from one side to the other in the axial direction A toward the tip, so that the width of the tip of the deformable portion 602b in the circumferential direction C gradually narrows. The deformable portion 602b also has a through hole 602H that penetrates the connecting portion 602 in the radial direction R. One end of the through hole 602H in the axial direction A extends beyond one end of the connecting portion 602 in the axial direction A to the position of the protrusions 602a. In addition, the width W1 of the deformable portion 602b in the circumferential direction C is slightly wider than the width W2 of the hole 51H of the busbar 5.

[0054] Next, the electrical connection between the terminal 6 and the busbar 5 will be described. First, the worker inserts the tip of the connection portion 602 of the terminal 6 into the first hole 51H of the busbar 5 by moving the busbar 5 in the axial direction A relative to the terminal 6. Next, the worker presses the connection portion 602 of the terminal 6 into the hole 51H of the busbar 5, thereby deforming the deformable portion 602b so that the width W3 of the deformable portion 602b becomes slightly narrower than the initial width W1, and the side surface of the first hole 51H comes into contact with the outer circumferential surface of the connection portion (part) 602 of the terminal 6. Thus, the terminal 6 and the busbar 5 are electrically connected. The busbar 5 is supported by the stator 4 via the terminal 6. Furthermore, when the connection portion 602 of the terminal 6 is inserted a predetermined length into the first hole 51H of the busbar 5 in the axial direction A, the lower surface (side surface) of the busbar 5 comes into contact with the pair of protrusions 602a of the terminal 6. Therefore, the length by which the terminals 6 protrude from the upper surface (side surface) of the busbar 5 is constant for all the terminals 6, and the position of the busbar 5 in the axial direction A relative to the stator 4 is determined.

[0055] Next, support of the bus bar 5 by the terminal 6 will be described. Fig. 11 is a perspective view showing a state in which the first bus bar 51 is supported by the terminal 6 shown in Fig. 3. Fig. 12 is a perspective view showing a state in which the second bus bar 52 is supported by the terminal 6 shown in Fig. 3. For ease of explanation, the second bus bar 52 is omitted in Fig. 11, and the first bus bar 51 is omitted in Fig. 12.

[0056] The terminals 6 include a first terminal 61 and a second terminal 62. The first terminal 61 electrically connects the neutral point NP to one of the coils 43 via the first bus bar 51. The second terminal 62 electrically connects the second bus bar 52 to one of the first coil 43U constituting the U phase, the second coil 43V constituting the V phase, or the third coil 43W constituting the W phase. As shown in FIG. 11 , the length of the second terminal 62 in the axial direction A is longer than the length of the first terminal 61 in the axial direction A.

[0057] The second terminal 62 includes a first shape 621 and a second shape 622 having a length in the axial direction A that is longer than that of the first shape 621 .

[0058] The insulator 7 is made of, for example, an insulating resin. As shown in Fig. 2 , the insulator 7 according to this embodiment includes a main body 71 that is a ring-shaped portion when viewed from the axial direction A, and a wall portion 72 that protrudes from the main body 71 to the other side in the axial direction A.

[0059] As described above, the motor 1 according to this embodiment includes a stator 4 having a terminal 6, and a bus bar 5 having a first hole portion 51H provided in the stator 4, and the side of the first hole portion 51H of the bus bar 5 is connected to the connection portion (part) 602 of the terminal 6.

[0060] In the motor 1 according to this embodiment, the first hole 51H of the bus bar 5 opens in the axial direction A, and the connection portion (portion) 602 of the terminal 6 extends in the axial direction A.

[0061] In the motor 1 according to this embodiment, the bus bars 5 are supported by the stator 4 via terminals 6 .

[0062] In addition, in the motor 1 according to this embodiment, the stator 4 includes a first bus bar 51, a second bus bar 52, a first terminal 61, and a second terminal 62, and the connection portion (part) 602 of the second terminal 62 is electrically connected to the hole portion 51H of the second bus bar 52.

[0063] In the motor 1 according to this embodiment, the stator 4 includes a plurality of coils 43 , and the second bus bar 52 is electrically connected to the coils 43 via the terminals 6 .

[0064] Furthermore, the motor 1 according to this embodiment includes a plurality of second bus bars 52 including a second bus bar 52, and includes two of the plurality of second bus bars 52 that are positioned to overlap in the axial direction A. Each of the two second bus bars 52 includes, in the axial direction A, low portions 21L, 22L, portions 21H, 22H that are higher than the low portions 21L, 22L, and step portions 21S, 22S, and of the two second bus bars 52, the low portion 22L of one second bus bar 52 and the high portion 21H of the other second bus bar 52 overlap in the axial direction A.

[0065] In addition, in the axial direction A of the motor 1 according to this embodiment, an insulator 7 is disposed between the first bus bar 51 and the second bus bar 52 .

[0066] The electronic device 100 also includes the motor 1 described above and a housing 101 that houses the motor 1 .

[0067] The electronic device 100 also includes the motor 1 described above and one or more gears 102 and 103 .

[0068] Second Embodiment Next, the schematic configuration of a motor 1A according to a second embodiment will be described with reference to Fig. 13 and Fig. 14. Fig. 13 is a plan view of the motor 1A provided in an electronic device 100 according to the second embodiment. Fig. 14 is a perspective view of the motor 1A shown in Fig. 13.

[0069] In the motor 1A according to this embodiment, various changes have been made to each part, mainly in the connection of the coils 43 in the stator 4A, which is different from the connection of the coils 43 in the stator 4 of the motor 1 according to the first embodiment. Note that in the configuration of the motor 1A according to the second embodiment, the same components as those in the motor 1 according to the first embodiment are denoted by the same reference numerals and descriptions thereof will be omitted. Also, in each drawing of the motor 1A according to the second embodiment, the rotor 3 is not shown.

[0070] As shown in FIG. 13, the motor 1A includes, for example, a shaft 2, a rotor 3, a stator 4A, a bus bar 5A, terminals 6A, and an insulator 7.

[0071] As shown in FIG. 14, the stator 4A includes, for example, one core (annular portion) 40, a plurality of teeth (magnetic pole portions) 41, a plurality of insulators 42, and a plurality of coils 43.

[0072] Next, the electrical connections of the multiple coils 43 in the motor 1A according to this embodiment will be described with reference to Figures 15 and 16. Figure 15 is an electrical circuit diagram of the multiple coils 43 provided in the stator 4A shown in Figure 14. Figure 16 is a wiring diagram of the multiple coils 43 shown in Figure 15.

[0073] The stator 4A includes a plurality of (four in this embodiment) first coils 43U that constitute the U phase of the motor 1A, a plurality of (four in this embodiment) second coils 43V that constitute the V phase of the motor 1A, and a plurality of (four in this embodiment) third coils 43W that constitute the W phase of the motor 1A.

[0074] The U-phase of the motor 1A is configured by connecting two of the four first coils 43U in series and connecting the two first coils 43U connected in series in parallel.

[0075] The V-phase of the motor 1A is configured by connecting two of the four second coils 43V in series and then connecting the two second coils 43V connected in series in parallel.

[0076] The W phase of the motor 1A is configured by connecting two of the four third coils 43W in series and connecting the two third coils 43W connected in series in parallel.

[0077] The U-phase, V-phase, and W-phase of the motor 1A are electrically connected, for example, by star connection. Furthermore, the AC power supplies (not shown) connected to these coils 43 are electrically connected, for example, by star connection.

[0078] Next, the multiple bus bars 5A of the motor 1A according to this embodiment will be described using Figures 17, 18, and 19. Figure 17 is a perspective view showing a second bus bar 52A of the multiple bus bars 5A. Figure 18 is a perspective view showing a state in which the first bus bar 51A is supported by the terminal 6A shown in Figure 14. Figure 19 is a perspective view showing a state in which the second bus bar 52A is supported by the terminal 6A shown in Figure 14. For ease of explanation, the second bus bar 52A is omitted from Figure 18, and the first bus bar 51A is omitted from Figure 19.

[0079] The bus bar 5A includes a first bus bar 51A and a plurality of second bus bars 52A. As shown in Fig. 15 , the first bus bar 51A electrically connects the first coil 43U constituting the U phase to a neutral point NP via a terminal 6A, electrically connects the second coil 43V constituting the V phase to a neutral point NP via a terminal 6A, and electrically connects the third coil 43W constituting the W phase to a neutral point NP via a terminal 6A. The first bus bar 51A shown in Fig. 18 includes a main body 51a and protrusions 51b.

[0080] As shown in FIG. 15, the second bus bar 52A is electrically connected to the coils 43 constituting the U-phase, V-phase, and W-phase via terminals 6A.

[0081] As shown in FIG. 17, the second bus bar 52A has a first shape 521A, a second shape 522A, and a third shape 523A that are different from one another.

[0082] The first shape 521A has a main body 521a, a protrusion 521b, and an external connection terminal 521c. The main body 521a of the first shape 521 also has, in the axial direction A, a low portion 21L, a high portion 21H, and a step portion 21S.

[0083] The second shape 522A has a main body 522a, a protrusion 522b, and an external connection terminal 522c. The main body 522a of the second shape 522 also has, in the axial direction A, a low portion 22L, a high portion 22H, and a step portion 22S.

[0084] The third shape 523A has a main body 523a, a protrusion 523b, and an external connection terminal 523c. The main body 523a of the third shape 523 also has, in the axial direction A, a low portion 23L, a high portion 23H, and a step portion 23S.

[0085] Each of the protrusions 51b, 521b, 522b, and 523b shown in FIGS. 17 and 18 has a hole 5H formed therein that penetrates (the side surface) of each of the protrusions 51b, 521b, 522b, and 523b in the axial direction A.

[0086] 17 , the first shape 521A and the second shape 522A are positioned to overlap in the axial direction A, the second shape 522A and the third shape 523A are positioned to overlap in the axial direction A, and the third shape 523A and the first shape 521A are positioned to overlap in the axial direction A.

[0087] Next, the overlapping of the first shape 521A, the second shape 522A, and the third shape 523A in the axial direction A will be described.

[0088] In the axial direction A, the high portion 21H of the first shape 521A and the low portion 22L of the second shape 522A overlap with each other.

[0089] In the axial direction A, the high portion 22H of the second shape 522A and the low portion 23L of the third shape 523A overlap with each other.

[0090] In the axial direction A, the high portion 23H of the third shape 523A and the low portion 21L of the first shape 521A overlap with each other.

[0091] Next, the terminals 6A will be described using Figures 18 and 19. The configuration of the terminals 6A includes the configuration of the terminals 6, and also includes protrusions 603 that protrude in the circumferential direction C from the side surfaces of the main body 601. The protrusions 603 electrically connect one terminal 6A to another terminal 6A via an electric wire W (see Figures 15, 16, and 18). Therefore, the motor 1A according to this embodiment can reduce the number of terminals 6A compared to the motor 1 according to the first embodiment.

[0092] Third Embodiment Next, the schematic configuration of a motor 1B according to a third embodiment will be described with reference to Fig. 20 and Fig. 21. Fig. 20 is a plan view of a motor 1B provided in an electronic device 100 according to the third embodiment. Fig. 21 is a perspective view of the motor 1B shown in Fig. 20.

[0093] In the motor 1B according to the third embodiment, various changes are made to each part, mainly in the connection of the coils 43 in the stator 4B, which is different from the connection of the coils 43 in the stator 4 of the motor 1 according to the first embodiment. Note that in the configuration of the motor 1B according to the third embodiment, the same components as those in the motor 1 according to the first embodiment and the motor 1A according to the second embodiment are denoted by the same reference numerals and will not be described again. Also, in each drawing of the motor 1B according to the third embodiment, the rotor 3 is not shown.

[0094] As shown in FIG. 20, the motor 1B includes, for example, a shaft 2, a rotor 3, a stator 4B, a bus bar 5B, terminals 6A, and an insulator 7.

[0095] As shown in FIG. 21, the stator 4B includes, for example, one core (annular portion) 40, a plurality of teeth (magnetic pole portions) 41, a plurality of insulators 42, and a plurality of coils 43.

[0096] Next, the electrical connections of the multiple coils 43 in the motor 1B according to this embodiment will be described with reference to Figures 22 and 23. Figure 22 is an electrical circuit diagram of the multiple coils 43 provided in the stator 4B shown in Figure 21. Figure 23 is a wiring diagram of the multiple coils 43 shown in Figure 22.

[0097] The stator 4B includes a plurality (four in this embodiment) of first coils 43U that constitute the U phase of the motor 1B, a plurality (four in this embodiment) of second coils 43V that constitute the V phase of the motor 1B, and a plurality (four in this embodiment) of third coils 43W that constitute the W phase of the motor 1B.

[0098] The U-phase of the motor 1B is configured by connecting two of the four first coils 43U in series and connecting the two first coils 43U in parallel.

[0099] The V-phase of the motor 1B is configured by connecting two of the four second coils 43V in series and connecting the two second coils 43V in parallel.

[0100] The W phase of the motor 1B is configured by connecting two of the four third coils 43W in series and connecting the two third coils 43W in parallel.

[0101] The U-phase, V-phase, and W-phase of the motor 1B are electrically connected, for example, by a delta connection. Furthermore, the AC power supplies (not shown) connected to these coils 43 are electrically connected, for example, by a delta connection.

[0102] Next, the multiple bus bars 5B of the motor 1B according to this embodiment will be described with reference to Figures 24 and 25. Figure 24 is a perspective view showing a second bus bar 52B of the multiple bus bars 5B. Figure 25 is a perspective view showing a state in which the second bus bar 52A is supported by the terminal 6A shown in Figure 21.

[0103] The bus bar 5B includes only a plurality of second bus bars 52B. The second bus bars 52B are electrically connected to the coils 43 constituting the U-phase, V-phase, and W-phase via terminals 6A.

[0104] The second bus bar 52B has a first shape 521B, a second shape 522B, and a third shape 523B that are different from one another.

[0105] Each of the protrusions 521b, 522b, and 523b shown in FIG. 24 has a hole 5H formed therein that penetrates through each of the protrusions 521b, 522b, and 523b in the axial direction A.

[0106] 24 , the first shape 521B and the second shape 522B are positioned to overlap in the axial direction A, the second shape 522B and the third shape 523B are positioned to overlap in the axial direction A, and the third shape 523B and the first shape 521B are positioned to overlap in the axial direction A.

[0107] Next, the overlapping of the first shape 521B, the second shape 522B, and the third shape 523B in the axial direction A will be described.

[0108] In the axial direction A, the protruding portion 521b protruding from the high portion 21H of the first shape 521B and the low portion 22L of the second shape 522B overlap with each other.

[0109] In the axial direction A, the protruding portion 522b protruding from the high portion 22H of the second shape 522B and the low portion 23L of the third shape 523B overlap with each other.

[0110] In the axial direction A, the protruding portion 523b protruding from the high portion 23H of the third shape 523B and the low portion 21L of the first shape 521B overlap with each other.

[0111] In the motor 1B according to this embodiment, for example, a terminal 6A having a protrusion 603 as shown in FIG. 25 is used.

[0112] The motors 1, 1A, and 1B according to the first to third embodiments described above are mounted on vehicles such as electric vehicles or hybrid vehicles. However, the motors 1, 1A, and 1B according to the present embodiments are not limited to these applications and can also be used in other devices.

[0113] Furthermore, the motors 1, 1A, and 1B according to the first to third embodiments described above have been described as including 12 coils 43 and 12 teeth 41. However, in the motors 1, 1A, and 1B according to the present embodiments, the numbers of coils 43 and teeth 41 are not limited to these and can be increased or decreased as appropriate.

[0114] The above has been a description of the first, second, and third embodiments of the motors 1, 1A, 1B, etc. according to the present invention, but it goes without saying that the present invention is not limited to these embodiments, and various modifications are possible without departing from the spirit of the present invention. The present invention also includes configurations in which the components of the above-described embodiments are appropriately combined. Such modifications without departing from the spirit of the present invention are also included within the technical scope of the present invention, and this will be clear to those skilled in the art from the claims.

[0115] DESCRIPTION OF SYMBOLS 1, 1A, 1B Motor, 4, 4A, 4B Stator, 43 Coil, 5, 5A, 5B Bus bar, 51, 51A First bus bar, 52, 52A, 52B Second bus bar, 21L, 22L, 23L Low portion, 21H, 22H, 23H High portion, 51H First hole portion (hole portion), 6, 6A Terminal, 61 First terminal, 62 Second terminal, 602 Connection portion (part), 7 Insulator, 100 Electronic device, 101 Housing, 102, 103 Gear, A Axial direction

Claims

1. A motor comprising a stator having terminals, and a bus bar provided on the stator and having a hole portion, wherein a side surface of the hole portion of the bus bar is connected to a part of the terminal.

2. The motor according to claim 1, wherein the hole portion of the bus bar opens in the axial direction, and a part of the terminal extends in the axial direction.

3. The motor according to claim 1 or 2, wherein the bus bar is supported with respect to the stator via the terminal.

4. The motor according to claim 1 or 2, comprising a second bus bar provided on the stator having a second terminal, with a part of the second terminal being electrically connected to a hole portion of the second bus bar, where the terminal is taken as a first terminal and the bus bar is taken as a first bus bar.

5. The motor according to claim 4, wherein the stator comprises a coil, and the second bus bar is electrically connected to the coil.

6. The motor according to claim 5, comprising a plurality of second bus bars including the second bus bar, including two second bus bars that overlap in the axial direction, each of the two second bus bars comprising a lower portion and a portion higher than the lower portion in the axial direction, and in the axial direction, the lower portion of one of the two second bus bars overlaps with the higher portion of the other second bus bar.

7. The motor according to claim 4 or 5, wherein an insulator is disposed between the first bus bar and the second bus bar in the axial direction.

8. An electronic device comprising the motor according to claim 6 and a housing for housing the motor.

9. An electronic device comprising the motor according to claim 6 and one or more gears.

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