Motor

Abstract

To use holding power acting on a bus bar holder from a housing as power for holding a stator core as well.SOLUTION: A motor may comprise: a cylindrical stator core; a coil disposed in the stator core; a bus bar connected to one end of the coil projecting from an end face of the stator core; at least one bus bar holder which holds the bus bar; and a housing which holds the stator core and the at least one bus bar holder from the outside in a radial direction. The bus bar holder may be located outside in the radial direction of the one end of the coil. The bus bar may comprise a connection part extending from the bus bar holder. The connection part may be connected to the one end of the coil from the outside in the radial direction.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The technology disclosed in this specification relates to a motor.

Background Art

[0002] Patent Document 1 describes a motor. This motor includes a stator core in which coils are arranged, a bus bar connected to one end of the coil, and a bus bar holder that holds the bus bar. The bus bar holder faces the stator core in the axial direction and is held by a housing from the outside in the radial direction.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described motor, a holding force acts from the housing toward the bus bar holder in the inner radial direction. However, the bus bar holder is arranged to face the stator core in the axial direction. Therefore, the radial holding force acting on the bus bar holder is difficult to be transmitted from the bus bar holder to the stator, and it is difficult to utilize this holding force as a force for holding the stator. This specification provides a technology that can also utilize the holding force acting from the housing on the bus bar holder as a force for holding the stator core.

Means for Solving the Problems

[0005] The technology disclosed in this specification is embodied in a motor. This motor may include a cylindrical stator core, a coil disposed in the stator core, a bus bar connected to one end of the coil protruding from an end face of the stator core, at least one bus bar holder for holding the bus bar, and a housing for holding the stator core and the at least one bus bar holder from the radially outer side. The bus bar holder may be located on the radially outer side with respect to the one end of the coil. The bus bar may have a connection portion extending from the bus bar holder. The connection portion may be connected from the radially outer side with respect to the one end of the coil.

[0006] In the above-described motor, the bus bar holder is located between one end of the coil and the housing in the radial direction. And the connection portion of the bus bar extending from the bus bar holder is connected from the radially outer side with respect to one end of the coil. According to such a configuration, the radial holding force acting on the bus bar holder from the housing is easily transmitted to the stator core through the connection portion between the bus bar and the coil. That is, the holding force acting on the bus bar holder from the housing can also be utilized as the force for holding the stator core. Thereby, for example, the holding force directly acting on the stator core from the housing can be reduced. In this case, the stress (i.e., strain) generated in the stator core is suppressed, and the magnetic loss in the stator core is reduced.

Brief Description of the Drawings

[0007]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying Out the Invention

[0008] In the first aspect of the present technology, as described above, the motor may include a cylindrical stator core, a coil disposed in the stator core, a bus bar connected to one end of the coil protruding from an end face of the stator core, at least one bus bar holder for holding the bus bar, and a housing for holding the stator core and the at least one bus bar holder from the outside in the radial direction. The bus bar holder may be located outside the one end of the coil in the radial direction. The bus bar may have a connecting portion extending from the bus bar holder. The connecting portion may be connected from the outside in the radial direction to the one end of the coil.

[0009] In the second aspect of the present technology, in addition to the above first aspect, the housing may have a recess for accommodating at least a part of the bus bar holder. In this case, the bus bar holder may contact the housing from the inside in the radial direction within the recess. According to such a configuration, by aligning the position of the bus bar holder with the recess of the housing, the positioning of the stator core with respect to the housing can be easily performed.

[0010] In a third aspect of the present technology, in addition to the above-described second aspect, the bus bar holder may contact the housing from at least one axial side within the recess. According to such a configuration, with respect to the axial direction, the positioning of the stator core with respect to the housing can be accurately performed.

[0011] In a fourth aspect of the present technology, in addition to the above-described second aspect or third aspect, the bus bar holder may contact the housing from at least one circumferential side within the recess. According to such a configuration, with respect to the circumferential direction, the positioning of the stator core with respect to the housing can be accurately performed.

[0012] In a fifth aspect of the present technology, in addition to any one of the first to fourth aspects above, the housing holds the stator core and the bus bar holder by interference fit. Such a configuration is not particularly limited, but can be realized by shrink-fitting the housing to the stator core and the bus bar holder.

[0013] In a sixth aspect of the present technology, in addition to any one of the first to fifth aspects above, the bus bar may include an extending portion that extends along the circumferential direction. In this case, the at least one bus bar holder may hold the extending portion of the bus bar and may include a plurality of bus bar holders held from the outside in the radial direction by the housing. According to such a configuration, the housing can stably hold the stator core via the plurality of bus bar holders.

[0014] In a seventh aspect of the present technology, in addition to the above-described sixth aspect, the plurality of bus bar holders may be arranged at equal intervals in the circumferential direction. According to such a configuration, the housing can hold the stator core more stably via the plurality of bus bar holders.

[0015] In the eighth aspect of the present technology, in addition to the above-described first aspect, the bus bar may be a bus bar that electrically connects between the external connection terminal of the motor and one end of the coil.

[0016] In the ninth aspect of the present technology, in addition to the above-described eighth aspect, the motor may be a three-phase motor. In this case, the external connection terminal may be any one of a U-phase external connection terminal, a V-phase external connection terminal, and a W-phase external connection terminal, and the one end of the coil may be one end on the input / output side of any one of a U-phase coil, a V-phase coil, and a W-phase coil.

[0017] In the tenth aspect of the present technology, in addition to the above-described eighth aspect, the motor may be a three-phase motor. In this case, the external connection terminal may be a neutral point external connection terminal, and the one end of the coil may be one end on the neutral point side of any one of a U-phase coil, a V-phase coil, and a W-phase coil.

[0018] In the eleventh aspect of the present technology, in addition to any one of the above-described first aspect to the seventh aspect, the motor may be a three-phase motor. In this case, the bus bar may be a bus bar that electrically connects the one end of the coil and one end of another coil to form a neutral point.

[0019] In the twelfth aspect of the present technology, in addition to any one of the above-described first aspect to the eleventh aspect, the bus bar holder may hold a plurality of bus bars including the above-described bus bar. By the bus bar holder holding a plurality of bus bars, the rigidity of the bus bar holder is increased. Thereby, the holding force acting on the bus bar holder from the housing can be more reliably transmitted to the stator core.

[0020] Hereinafter, representative and non-limiting specific examples of the present invention will be described in detail with reference to the drawings. This detailed description is merely intended to show those skilled in the art the details for implementing preferred examples of the present invention, and is not intended to limit the scope of the present invention. Also, the additional features and inventions disclosed below can be used separately or together with other features and inventions in order to provide an improved motor.

[0021] Also, the combinations of features and steps disclosed in the following detailed description are not essential for implementing the present invention in the broadest sense, and are described only for the purpose of explaining representative specific examples of the present invention in particular. Furthermore, the various features of the above and below representative specific examples, as well as the various features described in the independent and dependent claims, do not have to be combined as described in the specific examples here or in the order listed when providing additional and useful embodiments of the present invention.

[0022] All features described in this specification and / or the claims are intended to be disclosed separately and independently of each other, as limitations to the initial disclosure and the claimed specific matters, apart from the configurations of the features described in the examples and / or claims. Furthermore, all descriptions regarding numerical ranges and groups or populations are made with the intention of disclosing intermediate configurations as limitations to the initial disclosure and the claimed specific matters.

[0023] (Embodiment) With reference to FIGS. 1 to 5, the motor 10 of the embodiment will be described. The motor 10 is, for example, a motor for driving an electric vehicle. As shown in FIG. 2, the motor 10 is, for example, a three-phase motor. The motor 10 includes a plurality of external connection terminals 30U, 30V, and 30W. The plurality of external connection terminals 30U, 30V, and 30W include a U-phase external connection terminal 30U, a V-phase external connection terminal 30V, and a W-phase external connection terminal 30W. The U-phase external connection terminal 30U is a terminal for inputting and outputting AC power of the U-phase, the V-phase external connection terminal 30V is a terminal for inputting and outputting AC power of the V-phase, and the W-phase external connection terminal 30W is a terminal for inputting and outputting AC power of the W-phase. The motor 10 is driven by the AC power of the U-phase, V-phase, and W-phase supplied to the plurality of external connection terminals 30U, 30V, and 30W.

[0024] As shown in FIGS. 1 to 3, the motor 10 includes a shaft 12, a rotor 14, a stator 16, a plurality of busbars 22, a plurality of busbar holders 24, 26, and a housing 28. The shaft 12 extends along the central axis C of the motor 10. The rotor 14 is generally a cylindrical member and extends along the central axis C. The rotor 14 is fixed to the shaft 12 and rotates together with the shaft 12 about the central axis C as the rotation center.

[0025] Here, in this specification, a cylindrical coordinate system composed of an axial direction, a radial direction, and a circumferential direction is defined with reference to the central axis C of the motor 10. The axial direction is a direction parallel to the central axis C and is defined by a coordinate axis D1 parallel to the central axis C (see FIG. 3). In this specification, the positive direction of the coordinate axis D1 may be expressed as one side in the axial direction, and the negative direction of the coordinate axis D1 may be expressed as the other side in the axial direction. The radial direction is a direction orthogonal to the central axis C and is defined by a coordinate axis D2 having the central axis C as the origin (see FIG. 1). In this specification, the positive direction of the coordinate axis D2 may be expressed as the outside in the radial direction, and the negative direction of the coordinate axis D2 may be expressed as the inside in the radial direction. The circumferential direction is a direction perpendicular to the axial direction and the radial direction and is defined by a coordinate axis D3 that circulates around the central axis C (see FIG. 1). In this specification, the positive direction of the coordinate axis D3 may be expressed as one side in the circumferential direction, and the negative direction of the coordinate axis D3 may be expressed as the other side in the circumferential direction.

[0026] The stator 16 is generally a cylindrical member. The stator 16 is disposed radially outside the rotor 14. The stator 16 has a stator core 18 and a plurality of coils 20. In the motor 10, the rotor 14 and the shaft 12 rotate when AC power of the U-phase, V-phase, and W-phase is input to and output from the plurality of coils 20 of the stator 16 from the plurality of external connection terminals 30U, 30V, and 30W.

[0027] The stator core 18 is a cylindrical member. The stator core 18 has a first end face 18e and a second end face (not shown), and extends along the axial direction from the first end face 18e to the second end face. The stator core 18 further has an inner peripheral surface 18a and an outer peripheral surface 18b. The inner peripheral surface 18a is the radially inner surface of the stator core 18 and extends cylindrically along the circumferential direction. The inner peripheral surface 18a of the stator core 18 defines a through hole that houses at least a part of the rotor 14. A plurality of slots (not shown) arranged along the circumferential direction are formed in the inner peripheral surface 18a of the stator core 18. The outer peripheral surface 18b of the stator core 18 is the radially outer surface of the stator core 18 and extends cylindrically along the circumferential direction. The outer peripheral surface 18b of the stator core 18 is in contact with the housing 28. The inner peripheral surface 18a and the outer peripheral surface 18b extend along the axial direction between the first end face 18e and the second end face (not shown).

[0028] The plurality of coils 20 are disposed in the slots of the stator core 18. Specifically, each of the plurality of coils 20 (hereinafter referred to as each coil 20) is disposed across two or more slots. Each coil 20 is a segment coil and is composed of a conductor wire having a rectangular cross section. Note that the specific configuration of the plurality of coils 20 is not particularly limited. For example, the plurality of coils 20 may have a concentrated winding configuration or a distributed winding configuration.

[0029] In one example, although it is just one case, the plurality of coils 20 includes at least one U-phase coil 20U, at least one V-phase coil 20V, and at least one W-phase coil 20W (see FIG. 2). The U-phase coil 20U has a first end 20Ua on the input / output side and a second end 20Ub on the neutral point side. The V-phase coil 20V has a first end 20Va on the input / output side and a second end 20Vb on the neutral point side. And the W-phase coil 20W has a first end 20Wa on the input / output side and a second end 20Wb on the neutral point side. The second ends 20Ub, 20Vb, and 20Wb of the respective coils 20U, 20V, and 20W are electrically connected to each other, forming a neutral point in the Y-connection. That is, the motor 10 of this embodiment is a Y-connected motor. In FIG. 1, the first ends 20Ua of the U-phase coil 20U, the first ends 20Va of the V-phase coil 20V, and the first ends 20Wa of the W-phase coil 20W are not distinguished from each other, and all of them are illustrated as the first end 20a. As shown in FIG. 1, the first end 20a of each coil 20 protrudes axially from the first end face 18e of the stator core 18 to one side.

[0030] In addition to the above-described first end 20a, a part of the plurality of coils 20 protrudes axially from the first end face 18e of the stator core 18 to one side. The portion protruding from the first end face 18e of the stator core 18 in this way is also referred to as a "coil end" as a part of the plurality of coils 20.

[0031] Each of the plurality of busbars 22 (hereinafter referred to as each busbar 22) is configured using a conductor member such as metal. Each busbar 22 does not have flexibility like a wire and has rigidity capable of maintaining its own shape against at least its own weight. Note that a coating film made of an insulating material such as resin may be provided on the surface of each busbar 22. Each busbar 22 electrically connects between a corresponding one of the external connection terminals 30U, 30V, 30W and a first end 20a of a corresponding one of the coils 20. Although it is an example, the plurality of busbars 22 includes a U-phase busbar 22U, a V-phase busbar 22V, and a W-phase busbar 22W (see FIG. 2). The U-phase busbar 22U electrically connects between the U-phase external connection terminal 30U and the first end 20Ua of the U-phase coil 20U. The V-phase busbar 22V electrically connects between the V-phase external connection terminal 30V and the first end 20Va of the V-phase coil 20V. The W-phase busbar 22W electrically connects between the W-phase external connection terminal 30W and the first end 20Wa of the W-phase coil 20W. In FIG. 1, the U-phase busbar 22U, the V-phase busbar 22V, and the W-phase busbar 22W are all illustrated as the busbar 22 without being distinguished from each other.

[0032] Each busbar 22 has an extending portion 22e and a connecting portion 22c. In each busbar 22, the extending portion 22e is a portion extending in the circumferential direction. The extending portion 22e is electrically connected to a corresponding one of the external connection terminals 30U, 30V, 30W. Specifically, the extending portion 22Ue of the U-phase busbar 22U is electrically connected to the U-phase external connection terminal 30U. The extending portion 22Ve of the V-phase busbar 22V is electrically connected to the V-phase external connection terminal 30V. The extending portion 22We of the W-phase busbar 22W is electrically connected to the W-phase external connection terminal 30W.

[0033] In each coil 20, the connection portion 22c extends radially inward from the extending portion 22e. The connection portion 22c of each bus bar 22 is electrically connected to the first end 20a of the corresponding one coil 20. Specifically, the connection portion 22Uc of the U-phase bus bar 22U is electrically connected to the first end 20Ua of the U-phase coil 20U. The connection portion 22Vc of the V-phase bus bar 22V is electrically connected to the first end 20Va of the V-phase coil 20V. The connection portion 22Wc of the W-phase bus bar 22W is electrically connected to the first end 20Wa of the W-phase coil 20W. Here, the connection portion 22c of each bus bar 22 and the first end 20a of the coil 20 connected thereto face each other in the radial direction.

[0034] The plurality of bus bar holders 24, 26 hold the plurality of bus bars 22. Each of the plurality of bus bar holders 24, 26 (hereinafter referred to as each bus bar holder 24, 26) generally has a rectangular parallelepiped shape. Each of the bus bar holders 24, 26 is made of an insulating material such as resin. The plurality of bus bar holders 24, 26 are arranged along the circumferential direction, and the extending portion 22e of each bus bar 22 extends between one or more bus bar holders 24, 26. As shown in FIGS. 3 to 5, each of the bus bar holders 24, 26 is located radially outside the first end 20a of the corresponding one coil 20. And in each of the bus bar holders 24, 26, the connection portion 22c of the corresponding one bus bar 22 extends toward the first end 20a of the corresponding one coil 20 and is connected to the first end 20a.

[0035] The plurality of bus bar holders 24, 26 include two first bus bar holders 24 and a plurality of second bus bar holders 26. Each of the two first bus bar holders 24 (hereinafter referred to as each first bus bar holder 24) protrudes radially outward from the outer peripheral surface 18b of the stator core 18. Each of the plurality of second bus bar holders 26 (hereinafter referred to as each second bus bar holder 26) protrudes radially outward from the outer peripheral surface 18b of the stator core 18. The dimension of each first bus bar holder 24 in the radial direction is larger than the dimension of each second bus bar holder 26 in the radial direction.

[0036] As described above, the plurality of bus bar holders 24 and 26 are arranged along the circumferential direction. Among them, the two first bus bar holders 24 are arranged at equal intervals in the circumferential direction. That is, in this embodiment, the two first bus bar holders 24 are arranged at an interval of 180 degrees in the circumferential direction.

[0037] Although it is an example, as shown in FIGS. 3 to 5, the plurality of bus bars 22 are arranged along the axial direction. The plurality of bus bars 22 are arranged from one side in the axial direction to the other side in the order of the U-phase bus bar 22U, the V-phase bus bar 22V, and the W-phase bus bar 22W. The connection portions 22Uc, 22Vc, and 22Wc of the U-phase bus bar 22U, the V-phase bus bar 22V, and the W-phase bus bar 22W are different from each other in the circumferential direction and are located in different bus bar holders 24 and 26.

[0038] Specifically, as shown in FIG. 3, in one of the two first bus bar holders 24, the extending portions 22Ue, 22Ve, and 22We of the U-phase bus bar 22U, the V-phase bus bar 22V, and the W-phase bus bar 22W are held. And the connection portion 22Uc of the U-phase bus bar 22U extends from the one first bus bar holder 24 and is connected to the first end 20Ua of the U-phase coil 20U from the outside in the radial direction. As shown in FIG. 4, in one of the plurality of second bus bar holders 26, the extending portions 22Ve and 22We of the V-phase bus bar 22V and the W-phase bus bar 22W are held. And the connection portion 22Vc of the V-phase bus bar 22V extends from the one second bus bar holder 26 and is connected to the first end 20Va of the V-phase coil 20V from the outside in the radial direction. As shown in FIG. 5, in another one of the plurality of second bus bar holders 26, the extending portion 22We of the W-phase bus bar 22W is held. And the connection portion 22Wc of the W-phase bus bar 22W extends from the other second bus bar holder 26 and is connected to the first end 20Wa of the W-phase coil 20W from the outside in the radial direction.

[0039] The housing 28 is located radially outside the stator core 18. The housing 28 is generally a cylindrical housing member. The housing 28 has an inner peripheral surface 28a located radially inside and an outer peripheral surface 28b located radially outside. The housing 28 is in contact with the outer peripheral surface 18b of the stator core 18 and the two first busbar holders 24 on the inner peripheral surface 28a. Thereby, the housing 28 holds the stator core 18 and the plurality of first busbar holders 24 from the outside in the radial direction. On the other hand, the housing 28 is not in contact with the plurality of second busbar holders 26.

[0040] As described above, each first busbar holder 24 is located radially outside the first end 20a of the corresponding one coil 20. And in each first busbar holder 24, the connection portion 22c of the corresponding one busbar 22 is connected to the first end 20a of the corresponding one coil 20 from the outside in the radial direction. According to such a configuration, the radial holding force acting on each first busbar holder 24 from the housing 28 is easily transmitted to the stator core 18 through the connection portion between the busbar 22 and the coil 20. That is, the holding force acting on each first busbar holder 24 from the housing 28 can also be used as the force for holding the stator core 18. Thereby, for example, the holding force directly acting on the stator core 18 from the housing 28 can be reduced. In this case, the stress (i.e., strain) generated in the stator core 18 is suppressed, and the magnetic loss in the stator core 18 is reduced. In addition, although the connection portion 22c of the U-phase busbar 22U is provided in the first busbar holder 24 shown in FIG. 3, in addition to this, or instead of this, the connection portion 22Vc of the V-phase busbar 22V and / or the connection portion 22Wc of the W-phase busbar 22W may be provided.

[0041] Note that the number of the first bus bar holders 24 is not limited to two, and may be one or three or more. However, when there are a plurality of first bus bar holders 24, the plurality of first bus bar holders 24 may be arranged at equal intervals in the circumferential direction. According to such a configuration, the housing 28 can hold the stator core 18 more stably via the plurality of first bus bar holders 24.

[0042] Although it is an example, the housing 28 in the present embodiment is fixed to the stator core 18 and the two first bus bar holders 24 by shrink fitting. Therefore, the housing 28 holds the stator core 18 and the first bus bar holders 24 by interference fit. The stator core 18 and the first bus bar holders 24 are subjected to stress directed radially inward from the housing 28. According to such a configuration, regardless of whether it is by shrink fitting or not, the housing 28 can firmly hold the stator core 18 and the two first bus bar holders 24.

[0043] Although it is an example, the housing 28 has two recesses 28r. Each of the two recesses 28r (hereinafter referred to as each recess 28r) is recessed radially outward from the inner circumferential surface 28a of the housing. Each recess 28r houses at least a part of the corresponding first bus bar holder 24. In other words, each first bus bar holder 24 is in contact with the housing 28 from the radially inner side within the corresponding one recess 28r. According to such a configuration, when manufacturing the motor 10, by aligning the position of each first bus bar holder 24 with the corresponding one recess 28r of the housing 28, the positioning of the stator core 18 with respect to the housing 28 can be easily performed.

[0044] In one example, although it is just one case, each first bus bar holder 24 is in contact with the housing 28 from one axial side within the corresponding one recess 28r. According to such a configuration, in the axial direction, the positioning of the stator core 18 with respect to the housing 28 can be accurately performed in the axial direction. Note that, as another embodiment, each first bus bar holder 24 may be in contact with the housing 28 from the other axial side within the corresponding one recess 28r. Alternatively, each first bus bar holder 24 may be in contact with the housing 28 from both axial sides within the corresponding one recess 28r. However, in the motor 10 of this embodiment, each recess 28r extends to the end face 28e on one axial side of the housing 28. According to such a configuration, when manufacturing the motor 10, it is easy to arrange each first bus bar holder 24 within the corresponding one recess 28r.

[0045] In one example, although it is just one case, each first bus bar holder 24 is in contact with the housing 28 from both circumferential sides within the corresponding one recess 28r. That is, the dimension of the first bus bar holder 24 in the circumferential direction is substantially equal to the dimension of the recess 28r in the circumferential direction. According to such a configuration, in the circumferential direction, the positioning of the stator core 18 with respect to the housing 28 can be accurately performed in the circumferential direction. Note that each first bus bar holder 24 only needs to be in contact with the housing 28 from at least one circumferential side within the corresponding one recess 28r.

[0046] In one example, although it is just one case, as shown in FIG. 3, one of the two first bus bar holders 24 holds three bus bars 22. By the first bus bar holder 24 holding a plurality of bus bars 22, the rigidity of the first bus bar holder 24 and the overall rigidity of the plurality of bus bar holders 24, 26 connected by the plurality of bus bars 22 become relatively high. Thereby, the holding force acting on the first bus bar holder 24 from the housing 28 can be more reliably transmitted to the stator core 18. Note that it is not limited to the said one first bus bar holder 24, and the other first bus bar holder 24 or one or a plurality of second bus bar holders 26 may hold two or more bus bars 22.

[0047] Here, the correspondence between the configuration of the motor 10 in this embodiment and the configuration of the motor according to the present technology is shown. Each of the U-phase coil 20U, V-phase coil 20V, and W-phase coil 20W in this embodiment is an example of the "coil" in this embodiment. The plurality of first busbar holders 24 in this embodiment is an example of the "busbar holder" in the present technology. Also, the first ends 20Ua of the U-phase coil 20U, 20Va of the V-phase coil 20V, and 20Wa of the W-phase coil 20W in this embodiment are examples of the "one end of the coil" in the present technology. The U-phase busbar 22U in this embodiment, its extending portion 22Ue, and connecting portion 22Uc are examples of the "busbar", "extending portion", and "connecting portion" in the present technology. The V-phase busbar 22V in this embodiment, its extending portion 22Ve, and connecting portion 22Vc are examples of the "busbar", "extending portion", and "connecting portion" in the present technology. The W-phase busbar 22W in this embodiment, its extending portion 22We, and connecting portion 22Wc are examples of the "busbar", "extending portion", and "connecting portion" in the present technology.

[0048] (Embodiment 2) Referring to FIGS. 6 and 7, the motor 100 of Embodiment 2 will be described. As shown in FIG. 6, the motor 100 of Embodiment 2 further includes a neutral point busbar 122 in addition to the plurality of busbars 22 in Embodiment 1. The motor 100 of Embodiment 2 is different from the motor 10 of Embodiment 1 in this regard. The neutral point busbar 122 is a busbar that constitutes the neutral point. The neutral point busbar 122 connects the second ends 20b of the plurality of coils 20 to each other. Specifically, the neutral point busbar 122 electrically connects the second end 20Ub of the U-phase coil 20U, the second end 20Vb of the V-phase coil 20V, and the second end 20Wb of the W-phase coil 20W to each other. Note that the motor 100 of Embodiment 2 has a plurality of external connection terminals 30U, 30V, and 30W, similar to Embodiment 1.

[0049] The neutral bus bar 122 has an extending portion 122e and a plurality of connection portions 122c. The extending portion 122e of the neutral bus bar 122 extends in the circumferential direction. Each of the plurality of connection portions 122c extends radially inward from the extending portion 122e. Specifically, as shown in FIG. 7, in one of the first bus bar holders 24, the neutral bus bar 122 is held together with the extending portions 22Ue, 22Ve, and 22We of the U-phase bus bar 22U, the V-phase bus bar 22V, and the W-phase bus bar 22W. And each of the plurality of connection portions 122c of the neutral bus bar 122 extends from the first bus bar holder 24 and is connected to the second end 20b of any one of the plurality of coils 20 from the outside in the radial direction. That is, the second end 20b is any one of the second end 20Ub of the U-phase coil 20U, the second end 20Vb of the V-phase coil 20V, and the second end 20Wb of the W-phase coil 20W. Note that the neutral bus bar 122, the extending portion 122e, and the connection portion 122c in this embodiment are each an example of the "bus bar", the "extending portion", and the "connection portion" in this technology. The second end 20b of the coil 20 in this embodiment, that is, the second end 20Ub of the U-phase coil 20U, the second end 20Vb of the V-phase coil 20V, and the second end 20Wb of the W-phase coil 20W are an example of the "one end of the coil" in this technology.

[0050] (Embodiment 3) Referring to FIG. 8, the motor 200 of Embodiment 3 will be described. As shown in FIG. 8, in the motor 200 of Embodiment 3, in addition to the plurality of external connection terminals 30U, 30V, 30W of Embodiment 2, the plurality of external connection terminals 30U, 30V, 30W further includes a neutral point external connection terminal 230N. Further, the motor 200 of Embodiment 3 includes a neutral bus bar 222 instead of the neutral bus bar 122 in Embodiment 2. The neutral bus bar 222 has an extending portion 222e and a plurality of connection portions 122c similar to those in Embodiment 2. The extending portion 222e of the neutral bus bar 222 is electrically connected to the neutral point external connection terminal 230N. The neutral bus bar 222 electrically connects between the second end 20b of the coil 20 and the neutral point external connection terminal 230N of the motor 300. That is, in these points, the motor 200 of Embodiment 3 is different from Embodiment 2. Note that the neutral point external connection terminal 230N is an example of the "external connection terminal" in this technology.

[0051] (Example 4) Referring to FIG. 9, the motor 300 of Example 4 will be described. As shown in FIG. 9, the motor 300 of Example 4 includes four first bus bar holders 24, which is different from the motor 10 of Example 1 in this regard. The four first bus bar holders 24 are arranged at equal intervals in the circumferential direction. That is, in Example 4, the four first bus bar holders 24 are arranged at intervals of 90 degrees in the circumferential direction. According to such a configuration, the housing 28 can hold the stator core 18 more stably via the plurality of first bus bar holders 24.

[0052] (Example 5) Referring to FIG. 10, the motor 400 of Example 5 will be described. As shown in FIG. 10, in the motor 400 of Example 5, the configuration of one of the two recesses 28r in Example 1 is changed, which is different from the motor 10 of Example 1 in this regard. The motor 400 has a recess 28r and a second recess 428r. The second recess 428r is provided only in a range facing one of the two first bus bar holders 24. In this case, the one first bus bar holder 24 contacts the housing 28 from the inner side in the radial direction, both sides in the axial direction, and both sides in the circumferential direction within the second recess 428r. According to such a configuration, the positioning of the stator core 18 with respect to the housing 28 can be performed with high precision. However, as another embodiment, the second recess 428r may be adopted for all of the plurality of recesses of the housing 28.

[0053] In all of the above-described embodiments, each of the plurality of first bus bar holders 24 contacts the housing 28 in the corresponding recesses 28r, 428r. In contrast, as another embodiment, the plurality of first bus bar holders 24 may contact the housing 28 within one recess. In this case, the inner circumferential surface 28a of the housing 28 may have a recess that is long in the circumferential direction. Further, as yet another embodiment, the housing 28 may not have the recess 28r.

[0054] In the drawings, eight bus bar holders 24 and 26 are illustrated, but the number of the bus bar holders 24 and 26 is not limited thereto. The number of the bus bar holders 24 and 26 can be appropriately changed according to the configuration of the motor.

Explanation of Reference Numerals

[0055] 10, 100, 200, 300, 400: Motors, 16: Stator, 18: Stator Core, 18e: First End Face, 20: Coil, 20a: First End of Coil, 20b: Second End of Coil, 20U: U-Phase Coil, 20Ua: First End of U-Phase Coil, 20Ub: Second End of U-Phase Coil, 20V: V-Phase Coil, 20Va: First End of V-Phase Coil, 20Vb: Second End of V-Phase Coil, 20W: W-Phase Coil, 20Wa: First End of W-Phase Coil, 20Wb: Second End of W-Phase Coil, 22: Bus Bar, 22c: Connection Portion, 22e: Extension Portion, 22U: U-Phase Bus Bar, 22Uc: Connection Portion of U-Phase Bus Bar, 22Ue: Extension Portion of U-Phase Bus Bar, 22V: V-Phase Bus Bar, 22Vc: Connection Portion of V-Phase Bus Bar, 22Ve: Extension Portion of V-Phase Bus Bar, 22W: W-Phase Bus Bar, 22Wc: Connection Portion of W-Phase Bus Bar, 22We: Extension Portion of U-Phase Bus Bar, 24: First Bus Bar Holder, 26: Second Bus Bar Holder, 30: External Connection Terminal, 30U: U-Phase External Connection Terminal, 30V: V-Phase External Connection Terminal, 30W: W-Phase External Connection Terminal, 122, 222: Neutral Point Bus Bar, 122c: Connection Portion of Neutral Point Bus Bar, 122e, 222e: Extension Portion of Neutral Point Bus Bar, 230N: Neutral Point External Connection Terminal, C: Central Axis

Claims

1. A cylindrical stator core, a coil disposed in the stator core, a bus bar connected to one end of the coil protruding from an end face of the stator core, at least one bus bar holder for holding the bus bar, a housing for holding the stator core and the at least one bus bar holder from the outside in the radial direction, comprising, the bus bar holder is located outside the coil in the radial direction with respect to the one end of the coil, the bus bar has a connection portion extending from the bus bar holder, the connection portion is connected from the outside in the radial direction with respect to the one end of the coil, a motor.

2. The housing has a recess for accommodating at least a part of the bus bar holder, the bus bar holder is in contact with the housing from the inside in the radial direction within the recess, the motor according to claim l.

3. The bus bar holder is in contact with the housing from at least one side in the axial direction within the recess, the motor according to claim 2.

4. The bus bar holder is in contact with the housing from at least one side in the circumferential direction within the recess, the motor according to claim 2.

5. The housing holds the stator core and the bus bar holder by interference fit, the motor according to claim 4.

6. The bus bar includes an extending portion extending along the circumferential direction, the at least one bus bar holder holds the extending portion of the bus bar and includes a plurality of bus bar holders held by the housing from the outside in the radial direction, the motor according to claim l.

7. The plurality of bus bar holders are arranged at equal intervals in the circumferential direction, the motor according to claim 6.

8. The bus bar is a bus bar for electrically connecting between an external connection terminal of the motor and the one end of the coil, the motor according to claim l.

9. The motor is a three-phase motor, the external connection terminal is any one of a U-phase external connection terminal, a V-phase external connection terminal, and a W-phase external connection terminal, the one end of the coil is one end of an input / output side of any one of a U-phase coil, a V-phase coil, and a W-phase coil, the motor according to claim 8.

10. The motor is a three-phase motor, the external connection terminal is a neutral point external connection terminal, The one end of the coil is one end on the neutral point side of any one of the U-phase coil, the V-phase coil, and the W-phase coil, and the motor according to claim 8.

11. The motor is a three-phase motor, The bus bar is a neutral point bus bar that electrically connects the one end of the coil and one end of another coil to form a neutral point, and the motor according to claim 1.

12. The bus bar holder holds a plurality of bus bars including the bus bar, and the motor according to claim 1.

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