motor

Abstract

A motor includes a stator (33) having a plurality of coils (28) wound in the same direction, a plurality of first bus bars (50), and a plurality of second bus bars (51). The plurality of coils (28) includes a first coil (28) and a second coil (28) adjacent in a circumferential direction. One of the plurality of first bus bars (50) is electrically connected to one end portion (28b) of the first coil (28) and one end portion (28b) of the second coil (28), and one of the plurality of second bus bars (51) is electrically connected to the other end portion (28a) of the first coil (28). The other of the plurality of second bus bars (51) is electrically connected to the other end portion (28a) of the second coil (28).

Description

TECHNICAL FIELD

[0001] The present application relates to a motor. BACKGROUND

[0002] Patent Document 1 discloses a motor having bus bars for supplying electric current to a plurality of coils of a stator. Each coil is wound around an insulator about an axis defined in the radial direction.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENT

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-11954 SUMMARY

[0006] PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] In such a motor, the winding direction of the coils differs depending on the direction of the electric current flowing through the coils. Specifically, clockwise wound coils and counterclockwise wound coils are mixed. As a result, the connection work between the bus bars and the coils becomes complicated.

[0008] Therefore, one of the technical problems of the present application is to provide a motor capable of improving the workability of the connection of the bus bars and the coils.

[0009] SOLUTION TO THE PROBLEM

[0010] A motor according to one aspect of the present application includes a stator having a plurality of coils wound in the same direction, a plurality of first bus bars, and a plurality of second bus bars, the plurality of coils including a first coil and a second coil adjacent in the circumferential direction, one of the plurality of first bus bars electrically connected to one end portion of the first coil and one end portion of the second coil, one of the plurality of second bus bars electrically connected to the other end portion of the first coil, and the other of the plurality of second bus bars electrically connected to the other end portion of the second coil.

[0011] A motor according to another aspect of the present application includes a plurality of coils wound in the same direction, a first bus bar electrically connected to one end portion of a first coil and a second coil adjacent among the plurality of coils, a second bus bar electrically connected to the other end portion of the first coil, and a third bus bar electrically connected to the other end portion of the second coil, the direction of the electric current flowing through the first coil being opposite to the direction of the electric current flowing through the second coil. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 FIG. 1 is a perspective view schematically showing the configuration of a motor 1 according to one embodiment of the present application.

[0013] Figure 2 This is a vertical cross-sectional view schematically illustrating the structure of a motor 1 according to one embodiment of the present invention.

[0014] Figure 3 This is a horizontal cross-sectional view schematically illustrating the construction of a motor 1 according to one embodiment of the present invention.

[0015] Figure 4 It is a perspective view schematically showing the construction of a specific example of a stator assembly 25.

[0016] Figure 5 This is an exploded perspective view of the stator assembly 25 showing the state of the busbar unit 40 after it has been removed.

[0017] Figure 6 It is an exploded perspective view schematically representing the construction of a specific example of a busbar unit 40.

[0018] Figure 7 This is a three-dimensional diagram showing a state where only six first busbars 50 are arranged above coil 28.

[0019] Figure 8 This is a perspective view showing the state in which the lower second busbar 51 of the three second busbars 51 are stacked on top of the six first busbars 50.

[0020] Figure 9 This is a perspective view showing a state where the middle of three second busbars 51 is further stacked on the lower second busbar 51.

[0021] Figure 10 This is a perspective view showing the state where the upper second busbar 51 is one of three second busbars 51 further stacked on the middle second busbar 51.

[0022] Figure 11 This is a diagram showing the wiring circuit structure of motor 1. Detailed Implementation

[0023] Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings. Figure 1 This is a perspective view schematically illustrating the structure of a motor 1 according to one embodiment of the present invention. Figure 2 This is a vertical cross-sectional view schematically illustrating the structure of a motor 1 according to one embodiment of the present invention. Figure 3 This is a horizontal sectional view schematically illustrating the structure of a motor 1 according to one embodiment of the present invention. It should be noted that... Figure 2 Equivalent to Figure 1 A 2-2 cross-sectional view along an imaginary plane including the axis x that constitutes the rotational axis of motor 1. Furthermore, Figure 3 Equivalent to Figure 23-3 sectional view along an imaginary plane orthogonal to axis x.

[0024] It should be noted that in the following description of the embodiment of motor 1, one side along the direction of axis x (hereinafter referred to as "axial direction") is defined as the upper side, and the other side is defined as the lower side. These upper and lower sides defined in the axial direction may not necessarily correspond to the vertical relationship in the direction of gravity. Furthermore, the radial direction of motor 1 is defined as a direction perpendicular to axis x. In this radial direction, the side away from axis x is defined as the radially outer side (outer circumferential side), while the direction closer to axis x is defined as the radially inner side (inner circumferential side). Moreover, the circumferential direction of motor 1 is defined about axis x.

[0025] Refer to together Figures 1 to 3 The motor 1, for example, includes a cylindrical shaft 10 with axis x as its central axis. The shaft 10 is rotatably supported by two bearings 12 and 13 fixed to a housing 11. The bearings 12 and 13 are assembled between the shaft 10 and the housing 11, for example, by press-fitting. The bearings 12 and 13 are, for example, ball bearings. In this example, the shaft 10 protrudes significantly more from the lower side of the housing 11 than from the upper side of the upper end of the housing 11.

[0026] The housing 11 has, for example, a cylindrical body (hereinafter referred to as the "housing body") 14 and, for example, a disc-shaped cover 15. The lower end of the housing body 14 is open, while the upper end of the housing body 14 is closed by the upper portion of the housing body 14. The lower end of the housing body 14 is covered and closed by the cover 15. The shaft 10 protrudes to the outside of the housing 11 from the opening 16 formed at the upper end of the housing body 14 and the opening 17 formed at the cover 15, respectively. A flange 14a is formed at the lower end of the housing body 14, protruding radially in a predetermined shape. This flange 14a is used, for example, to assemble the motor 1 into a predetermined application.

[0027] A cylindrical rotor core 18 is fixed axially between bearings 12 and 13 on shaft 10. The rotor core 18 is formed by a stack of multiple magnetic bodies stacked axially. Figure 3 It is understood that the rotor core 18 has, for example, a cylindrical inner peripheral portion 19, a cylindrical outer peripheral portion 20, and a plurality of connecting portions 21 that connect the inner peripheral portion 19 and the outer peripheral portion 20 to each other. In the rotor core 18, the shaft 10 is inserted into and fixed in a hole formed in the inner peripheral portion 19 along the axis x. Each connecting portion 21 is, for example, formed as a longitudinally elongated plate extending radially.

[0028] Multiple magnets 22 are embedded in the outer periphery 20 of the rotor core 18, close to its outer peripheral surface. The magnets 22 are, for example, permanent magnets. Each magnet 22 is fixed, for example, in a through hole 23 of the axially extending outer periphery 20, close to the outer peripheral surface of the rotor core 18. Among the circumferentially arranged magnets 22, the orientation of the magnetic poles is alternately set as N pole and S pole. This motor 1 is a so-called magnet embedded type (IPM) motor. Furthermore, the rotor core 18 and the magnets 22 form the rotor 24 of the motor 1. That is, the motor 1 is a motor with an embedded rotor.

[0029] A stator assembly 25 is housed within the outer casing 11. The stator assembly 25 includes a stator core 26, multiple insulators 27, and multiple coils 28. The stator core 26 is fixed to the inner circumferential surface of the outer casing body 14. Multiple coils 28 arranged circumferentially are wound around the stator core 26. The stator core 26 is formed, for example, from a laminate of magnetic materials such as silicon steel sheets. The coils 28 are, for example, copper wire. The insulators 27 are formed, for example, from insulating materials such as resin. The insulators 27, disposed between the stator core 26 and the coils 28, insulate the stator core 26 from the coils 28.

[0030] like Figure 3 As shown, the stator core 26 has a cylindrical portion 29 and a plurality of teeth 30. The cylindrical portion 29 is fixed to the inner circumferential surface of the housing body 14 by its outer circumferential surface. Each tooth 30 has a spoke 31 and a magnetic pole portion 32. The spoke 31 extends radially from its outer circumferential end to its inner circumferential end. The magnetic pole portion 32 is continuous with the inner circumferential end of the spoke 31. The magnetic pole portion 32 protrudes circumferentially from the spoke 31 in opposite directions. The teeth 30 face the outer circumferential surface of the outer circumferential portion 20 of the rotor core 18 through the inner circumferential surface of the magnetic pole portion 32 with a predetermined magnetic gap. A coil 28 is wound around each spoke 31 with an insulator 27 in between. It should be noted that the stator core 26, the insulator 27, and the coil 28 constitute the stator 33 of the motor 1.

[0031] Figure 4 It is a perspective view schematically showing the construction of a specific example of a stator assembly 25. Figure 5 This is an exploded perspective view of the stator assembly 25 showing the state after the busbar unit 40 has been removed. See also... Figure 2 , Figure 4 and Figure 5 The stator assembly 25 has a busbar unit 40. The busbar unit 40 is disposed between the coil 28 and the upper end of the housing body 14. The busbar unit 40 has an annular housing 41 and a busbar assembly 42, which serves as a conductive member, housed within the housing 41. The busbar unit 40 is configured to supply current to the coil 28 from an external power source (not shown) via the busbar assembly 42.

[0032] Busbar assembly 42 has a plurality of terminals (twelve in this example, referred to as "outer terminals") 43 extending from housing 41 to the outer periphery, a plurality of terminals (twelve in this example, referred to as "first terminals") 44 extending from housing 41 to the inner periphery, and a plurality of terminals (three in this example, referred to as "outer terminals") 45 extending from housing 41 to the upper side. The outer terminals 43 and the inner terminals 44 are forked terminals. The outer terminals 43 are arranged from housing 41 to the outer periphery, while the inner terminals 44 are arranged from housing 41 to the inner periphery.

[0033] That is, the outer terminal 43 and the inner terminal 44 are arranged in different positions in the radial direction. In this example, the outer terminal 45 extends from the housing 41 from the outer peripheral side toward the upper side.

[0034] Multiple outer terminals 43 and multiple inner terminals 44 are electrically connected to coil 28 based on a predetermined wiring circuit. On the other hand, outer terminals 45 are electrically connected to an external device (not shown). The external device includes a power supply for supplying current to motor 1, etc. Details of the wiring circuit will be described later. Figure 1 and Figure 2 As shown, the external terminal 45 protrudes upward through the opening 14b formed at the upper end of the housing body 14 to the outside of the housing 11. In this example, the three external terminals 45 are arranged at equal intervals in the circumferential direction. Each external terminal 45 is electrically connected to an external device via wiring (not shown) or the like.

[0035] Each coil 28 has an additional end (hereinafter referred to as the "outer end") 28a extending from the outer circumference to the upper side and an end (hereinafter referred to as the "inner end") 28b extending from the inner circumference to the upper side. In this example, all coils 28 are wound around the spoke 31 in the same direction about an axis defined in the radial direction. Furthermore, all coils 28 are wound around each spoke 31 in the same manner. The plurality of outer ends 28a and the plurality of inner ends 28b are arranged at equal intervals in the circumferential direction. In this example, twelve coils 28 are arranged circumferentially, so the twelve outer ends 28a are arranged at a predetermined interval (e.g., equal intervals), and the twelve inner ends 28b are arranged at a predetermined interval (e.g., equal intervals).

[0036] Each outer terminal 43 has a recessed groove (recess) 43a extending from its outer peripheral end toward its inner peripheral side. The outer end 28a is received within this groove 43a, and each coil 28 is electrically connected to the outer terminal 43. Similarly, each inner terminal 44 has a recessed groove (recess) 44a extending from its inner peripheral end toward its outer peripheral side. The inner end 28b is received within this groove 44a, and each coil 28 is electrically connected to the inner terminal 44. It should be noted that riveting can also be performed on each outer terminal 43 and each inner terminal 44 to press the outer ends 28a and 28b onto each outer terminal 43 and each inner terminal 44, respectively. Alternatively, the outer ends 28a and 28b can also be joined to each outer terminal 43 and each inner terminal 44 using a joining member (solder), respectively.

[0037] Figure 6 This is an exploded perspective view schematically illustrating the construction of a specific example of a busbar unit 40. For example... Figure 6 As shown, the housing 41 of the busbar unit 40 has a base 46 for housing the busbar assembly 42 and a cover 47 covering the upper end of the base 46. Both the base 46 and the cover 47 are formed of an insulating material including a resin material. The busbar assembly 42 has a plurality of first busbars 50 and a plurality of second busbars 51. In this example, the first busbars 50 are arranged side by side along the circumference. On the other hand, three second busbars 51 are arranged axially above the first busbars 50. The first busbars 50 and the second busbars 51 are formed of a conductive material including metallic materials such as copper and aluminum.

[0038] Each first busbar 50 has a portion 52 extending in an arc shape along the circumference and a plurality of (in this example, a pair) inner terminals 44, 44 extending from the portion 52 toward the inner circumference. The pair of inner terminals 44, 44 are arranged at a predetermined interval in the circumferential direction. Two adjacent first busbars 50, 50 in the circumferential direction are arranged separately in the circumferential direction. In this example, all first busbars 50 have the same shape. On the other hand, each second busbar 51 has a portion 53 extending in a ring shape along the circumference, a plurality of (in this example, four) outer terminals 43 extending from the portion 53 toward the outer circumference, and an outer terminal 45 extending upward. In this example, the portion 53 is formed in a continuous ring shape. The outer terminals 43 and the outer terminal 45 are arranged at a predetermined interval (e.g., equal interval) in the circumferential direction. All second busbars 51 have the same shape.

[0039] An insulating member 54 is disposed between axially adjacent first busbars 50 and second busbars 51, and between axially adjacent second busbars 51 and each other. In this example, the insulating member 54 is formed of, for example, a flat, sheet-like annular member. The insulating member 54 is formed of, for example, an insulating material comprising a resin material. In this example, when viewed from above, the outline of the insulating member 54 is substantially consistent with the outline of the second busbars 51 when viewed from above. Through the function of the insulating member 54, insulation is ensured between axially adjacent first busbars 50 and second busbars 51, and between axially adjacent second busbars 51, 51 and each other. In the busbar unit 40, these first busbars 50, second busbars 51, and insulating members 54 are stacked axially.

[0040] The base 46 of the housing 41 defines an annular space for accommodating the busbar assembly 42. This annular space is enclosed by a cover 47. A plurality of recesses 46a are formed on the outer peripheral sidewall of the base 46. The recesses 46a are recessed downwards from the upper end of the outer peripheral sidewall. Each recess 46a can accommodate an outer terminal 43. On the other hand, a plurality of recesses 46b are formed on the inner peripheral sidewall of the base 46. The recesses 46b are recessed downwards from the upper end of the inner peripheral sidewall. Each recess 46b can accommodate an inner terminal 44. When the busbar assembly 42 is accommodated in the annular space of the base 46, the inner terminal 44 of the first busbar 50 protrudes from the recess 46b toward the inner peripheral side, and the outer terminal 43 of the second busbar 51 protrudes from the recess 46a toward the outer peripheral side.

[0041] The housing 41's cover 47 has: an annular portion 47a that closes the annular space of the base 46; a plurality of retaining portions 47b disposed on the outer periphery of the portion 47a; and a plurality of protrusions 47c that project downwards from the outer and inner periphery edges of the portion 47a. The portion 47a extends, for example, along a plane orthogonal to the axis x. The retaining portions 47b are formed as cylindrical sections capable of holding the outer terminals 45 of the second busbar 51. Figure 1 As shown, the retaining part 47b passes through the opening 14b of the housing body 14 of the motor 1 and partially protrudes to the outside of the housing 11. When the cover 47 is assembled with the base 46, each protrusion 47c is received in the recesses 46a and 46b of the base 46.

[0042] Next, the electrical connection between the busbar group 42 of the busbar unit 40 and the plurality of coils 28 will be described. Figure 7 This is a perspective view showing the state where only the first busbar 50 is arranged above the coil 28. In this example, the coils 28 are labeled 28A to 28L sequentially along the circumference. Similarly, the first busbar 50 is labeled 50A to 50F sequentially along the circumference. The inner terminals 44, 44 of the first busbar 50A are electrically connected to the inner terminals 28b of coil 28A and 28b of coil 28B, respectively.

[0043] The inner terminals 44, 44 of the second busbar 50B are electrically connected to the inner terminals 28b of coil 28C and 28d, respectively. Hereinafter, the inner terminal 44 of the second busbar 50C is electrically connected to the inner terminals 28b of coil 28E and 28F; the inner terminal 44 of the second busbar 50D is electrically connected to the inner terminals 28b of coil 28G and 28H; the inner terminal 44 of the second busbar 50E is electrically connected to the inner terminals 28b of coil 28I and 28J; and the inner terminal 44 of the second busbar 50F is electrically connected to the inner terminals 28b of coil 28K and 28L. Thus, the first buses 50A to 50F are electrically connected to a pair of circumferentially adjacent coils 28, 28, respectively.

[0044] Figure 8 This is a perspective view showing the state in which the lower second generatrix 51 is stacked on top of three second generatrixes 51 arranged circumferentially as first generatrixes 50A to 50F. In this example, the lower second generatrix 51 is labeled 51A. Figure 8 As shown, the four outer terminals 43 of the second busbar 51A are electrically connected to the outer ends 28a of coils 28A, 28F, 28H, and 28K, respectively. The outer terminals 45 of the second busbar 51A are positioned above the coil 28C in the axial direction. Thus, one second busbar 51A is electrically connected to four coils 28.

[0045] Figure 9 This is a perspective view showing the state where the middle second busbar 51 of three second busbars 51 are further stacked on the lower second busbar 51A. In this example, the middle second busbar 51 is labeled 51B. Figure 9 As shown, the four outer terminals 43 of the second busbar 51B are electrically connected to the outer ends 28a of coils 28B, 28D, 28G, and 28I, respectively. The outer terminals 45 of the second busbar 51B are positioned above the coil 28K along its axial direction. Thus, one second busbar 51B is electrically connected to four coils 28.

[0046] Figure 10 This is a perspective view showing the state where three second busbars 51 are further stacked on top of the middle second busbar 51B, with the upper second busbar 51 being the most prominent one. In this example, the upper second busbar 51 is labeled 51C. Figure 10 As shown, the four outer terminals 43 of the second busbar 51C are electrically connected to the outer ends 28a of coils 28C, 28E, 28J, and 28L, respectively. The outer terminals 45 of the second busbar 51C are positioned above the coil 28G in the axial direction. Thus, one second busbar 51C is electrically connected to four coils 28.

[0047] In the bus unit 40 above, a delta connection / two-series-two-parallel connection circuit is established. In this connection circuit, the second bus 51A on the lower side of the axial direction forms the U phase, the second bus 51B in the middle forms the V phase, and the third bus 51C on the upper side of the axial direction forms the W phase. Figure 11 This diagram shows the wiring circuit structure of motor 1. The wiring circuit consists of three second busbars 51A, 51B, and 51C that respectively constitute phases U, V, and W; six first busbars 50A to 50F; and twelve coils 28A to 28L. (See diagram for details.) Figure 11 As shown, a pair of coils 28, 28 adjacent to each other in the circumferential direction are connected in series to ground via the second bus 51.

[0048] In such a stator assembly 25, as an example, current flows from an external device into the second busbar 51A, which constitutes phase U, through external terminals 45. Figure 8 As shown, current flows from the external terminal 45 of the second busbar 51A (second busbar) into the coil 28K (first coil). Then, as... Figure 7 As shown, current flows from coil 28K to the first busbar 50F (first busbar) and then into coil 28L (second coil), which is circumferentially adjacent to coil 28K. Figure 10 As shown, current flows from coil 28L into the second busbar 51C (third busbar) constituting phase W, and then flows out from the external terminal 45 of the second busbar 51C to an external device. That is, in adjacent coils 28K and 28L, the direction of current is opposite to that of each other.

[0049] In the motor 1 described above, for example, the inner ends 28b of coils 28K and 28L are electrically connected via a first busbar 50F. As a result, current flowing into coil 28K from the second busbar 51A via the outer end 28a of coil 28K flows into coil 28L via the first busbar 50F from the inner end 28b. Current flows out from the outer end 28a of coil 28L to the second busbar 51C. Adjacent coils 28, 28 wound in the same direction are electrically connected via the second busbar 51C, thus establishing a structure in which current flows in opposite directions in adjacent coils 28, 28. With this structure, it is not necessary to have different winding directions for each coil 28, thus significantly improving the operability of the connection between the busbar unit 40 and the coils 28.

[0050] It should be noted that in motor 1, the first busbar 50 has an inner terminal 44 and the second busbar 51 has an outer terminal 43, but the opposite structure can also be established. That is, the first busbar 50 can have an outer terminal 43, while the second busbar 51 can have an inner terminal 44. As an alternative example, both the first busbar 50 and the second busbar 51 can have inner terminals 44, and conversely, both the first busbar 50 and the second busbar 51 can have outer terminals 43. In this case, the other end 28a and the other end 28b of the coil 28 can be arranged either from the first busbar 50 and the second busbar 51 toward the inner periphery, or both can be arranged from the first busbar 50 and the second busbar 51 toward the outer periphery.

[0051] The embodiments described above are intended to facilitate understanding of the present invention, and not to limit its interpretation. Furthermore, the above embodiments do not limit the scope of application of the present invention; the present invention can include any object as its object of application. The constituent elements, their arrangement, materials, conditions, shapes, and dimensions, etc., provided in the above embodiments are not limited to the examples shown and can be appropriately modified. For example, the present invention includes differences that may arise during implementation, such as manufacturing tolerances. Furthermore, the constituent elements shown in different embodiments can be partially substituted or combined with each other to the extent that they are not technically contradictory. Moreover, the structures can be appropriately and selectively combined to achieve at least a portion of the aforementioned problems and effects.

[0052] Explanation of reference numerals in the attached figures

[0053] 1: Motor; 10: Shaft; 11: Housing; 12, 13: Bearings; 14: Main body (housing body); 14a: Flange; 14b: Opening; 15: Cover; 16: Opening; 17: Opening; 18: Rotor core; 19: Inner circumference; 20: Outer circumference; 21: Connecting part; 22: Magnet; 23: Through hole; 24: Rotor; 25: Stator assembly; 26: Stator core; 27: Insulator; 28, 28A~28L: Coil; 28a: Another end (outer end); 28b: One end (inner end); 29: Cylindrical part; 30: Tooth; 31: Spoke; 32: Magnetic pole section; 33: Stator; 40: Busbar unit; 41: Housing; 42: Busbar assembly; 43: Terminal (second terminal); 43a: Groove; 44: Terminal (first terminal); 44a: Groove; 45: Terminal; 46: Base; 46a: Recess; 46b: Recess; 47: Cover; 47a: Part; 47b: Holding part; 47c: Protrusion; 50, 50A~50F: First busbar; 51, 51A~51C: Second busbar; 52: Part; 53: Part; 54: Insulating member; x: Axis.

Claims

1. A motor, comprising: The stator has multiple coils wound in the same direction; Multiple first busbars; and Multiple second busbars, The plurality of coils includes a first coil and a second coil that are circumferentially adjacent. One of the plurality of first busbars is electrically connected to one end of the first coil and one end of the second coil. One of the plurality of second busbars is electrically connected to the other end of the first coil. The other second busbar of the plurality of second busbars is electrically connected to the other end of the second coil.

2. The motor according to claim 1, wherein, The plurality of first busbars are arranged side by side along the circumference.

3. The motor according to claim 1 or 2, wherein, The plurality of second busbars are stacked axially.

4. The motor according to any one of claims 1 to 3, wherein, Each of the plurality of second busbars has a terminal for electrical connection to an external device.

5. The motor according to any one of claims 1 to 4, wherein, Multiple terminals of the first busbar are electrically connected to one end of the first coil and one end of the second coil.

6. The motor according to claim 5, wherein, One terminal of the second busbar is electrically connected to the other end of the first coil. The terminals of the other second busbar are electrically connected to the other end of the second coil.

7. The motor according to any one of claims 1 to 6, wherein, The first busbar has a portion extending circumferentially and the plurality of terminals extending radially inward.

8. The motor according to any one of claims 1 to 7, wherein, The second busbar has a portion extending circumferentially and the plurality of terminals extending radially outward.

9. A motor, comprising: Multiple coils are wound in the same direction; The first busbar is electrically connected to one end of the first and second coils, which are adjacent to each other among a plurality of coils; The second busbar is electrically connected to the other end of the first coil; and The third busbar is electrically connected to the other end of the second coil. The direction of the current flowing through the first coil is opposite to the direction of the current flowing through the second coil.

10. The motor according to claim 9, wherein, The first busbar, the second busbar, and the third busbar are formed from different components.

11. The motor according to claim 9 or 10, wherein, The first busbar has two first terminals that are electrically connected to the first coil and the second coil. The second busbar has a second terminal that is electrically connected to the first coil. In the radial direction, the two first terminals and the second terminal are located at different positions.

12. The motor according to claim 11, wherein, The two first terminals extend radially inward, and the second terminal extends radially outward.

13. The motor according to any one of claims 9 to 12, wherein, The second busbar and the third busbar each have terminals for electrical connection to external devices.

Images