Motor

Abstract

A motor includes a cylindrical stator core, a coil, a bus bar, at least one bus bar holder, and a housing. The bus bar is configured to be connected to one end of the coil protruding from an end surface of the stator core. The bus bar has a connection portion connected to the one end of the coil from the outside in the radial direction. The at least one bus bar holder is positioned on the outside in the radial direction with respect to the one end of the coil. The housing is configured so as to hold the stator core and the at least one bus bar holder from the outside in the radial direction. The connection portion extends from the bus bar holder.

Description

Technical Field

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

[0002] A motor is described in Japanese Unexamined Patent Application Publication No. 2019-170071. The motor includes a stator core in which a coil is disposed, a bus bar connected to one end of the coil, and a bus bar holder that holds the bus bar. The bus bar holder is opposed to the stator core in the axial direction and is held by a housing from the outer side in the radial direction.

[0003] In the above-described motor, a holding force acts on the bus bar holder from the housing toward the inner side in the radial direction. However, the bus bar holder is disposed to be opposed to 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 thus it is difficult to use this holding force as a force for holding the stator. The present disclosure provides a motor that also uses the holding force acting on the bus bar holder from the housing as a force for holding the stator core. Summary of the Invention

[0004] The motor according to the technical solution of the present disclosure includes a cylindrical stator core, a bus bar disposed in the stator core, at least one bus bar holder, and a housing. The bus bar is configured to be connected to one end of the coil protruding from an end face of the stator core. The bus bar has a connecting portion that is connected to the one end of the coil from the outer side in the radial direction. The at least one bus bar holder is configured to hold the bus bar and is located on the outer side in the radial direction with respect to the one end of the coil. The housing is configured to hold the stator core and the at least one bus bar holder from the outer side in the radial direction. The connecting portion extends from the bus bar holder.

[0005] In the above-described motor, the bus bar holder is located between one end of the coil and the housing in the radial direction. Moreover, the connecting portion of the bus bar extending from the bus bar holder is connected to one end of the coil from the outer side in the radial direction. According to the above structure, the radial holding force acting on the bus bar holder from the housing is easily transmitted to the stator core via the connecting 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 used as a 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., deformation) generated in the stator core is suppressed, and the magnetic loss in the stator core is reduced.

[0006] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned housing may also have a recess for accommodating at least a part of the above-mentioned bus bar holder. The above-mentioned bus bar holder may also contact the housing from the inner side in the above-mentioned radial direction within the above-mentioned recess. According to the above structure, by aligning the position of the bus bar holder with the recess of the housing, the positioning of the stator core relative to the housing can be easily performed.

[0007] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned bus bar holder may also contact the housing from at least one side in the axial direction within the above-mentioned recess. According to the above structure, the positioning of the stator core relative to the housing can be performed with high precision in the axial direction.

[0008] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned bus bar holder may also contact the housing from at least one side in the circumferential direction within the above-mentioned recess. According to the above structure, the positioning of the stator core relative to the housing can be performed with high precision in the circumferential direction.

[0009] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned housing may also hold the above-mentioned stator core and the above-mentioned bus bar holder by interference fit. The above structure is not particularly limited, but can be achieved by thermally pressing the housing against the stator core and the bus bar holder.

[0010] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned bus bar may also have an extension portion extending along the circumferential direction. The above-mentioned at least one bus bar holder may also include a plurality of bus bar holders that hold the above-mentioned extension portion of the above-mentioned bus bar and are held by the above-mentioned housing from the outer side in the above-mentioned radial direction. According to the above structure, the housing can stably hold the stator core via a plurality of bus bar holders.

[0011] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned plurality of bus bar holders may also be arranged at equal intervals in the above-mentioned circumferential direction. According to the above structure, the housing can hold the stator core more stably via a plurality of bus bar holders.

[0012] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned bus bar may also be a bus bar configured to electrically connect the external connection terminal of the above-mentioned motor and one end of the above-mentioned coil.

[0013] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned motor may also be a three-phase motor. The above-mentioned external connection terminal may also be any one of the U-phase external connection terminal, V-phase external connection terminal, and W-phase external connection terminal. One end of the above-mentioned coil may also be one end of the input / output side of any one of the U-phase coil, V-phase coil, and W-phase coil.

[0014] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned motor may also be a three-phase motor. The above-mentioned external connection terminal may also be a neutral point external connection terminal. The above-mentioned one end of the above-mentioned coil may also be one end on the neutral point side of any one of the U-phase coil, the V-phase coil, and the W-phase coil.

[0015] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned motor may also be a three-phase motor. The above-mentioned bus bar may also be a neutral point bus bar configured to electrically connect one end of the above-mentioned coil to one end of another coil and form a neutral point.

[0016] Based on the motor involved in the technical solution of the present disclosure, the above-mentioned bus bar holder may also hold a plurality of bus bars including the above-mentioned bus bar. By holding a plurality of bus bars with the bus bar holder, the rigidity of the bus bar holder becomes higher. Thereby, the holding force acting on the bus bar holder from the housing can be more reliably transmitted to the stator core.

[0017] Hereinafter, with reference to the accompanying drawings, the features, advantages, and technical and industrial significance of the exemplary embodiments of the present invention will be described. In the drawings, the same reference numerals denote the same elements. Description of the Drawings

[0018] Figure 1 It is a top view showing the structure of the motor of Embodiment 1.

[0019] Figure 2 It shows the circuit diagram of the motor of Embodiment 1.

[0020] Figure 3 It is Figure 1 A cross-sectional view taken along line III-III. The shaft and the rotor are not shown.

[0021] Figure 4 It is Figure 1 A cross-sectional view taken along line IV-IV. The shaft and the rotor are not shown.

[0022] Figure 5 It is Figure 1 A cross-sectional view taken along line V-V. The shaft and the rotor are not shown.

[0023] Figure 6 It shows the circuit diagram of the structure of the motor of Embodiment 2.

[0024] Figure 7 It is a cross-sectional view showing the structure of the motor of Embodiment 2.

[0025] Figure 8 It shows the circuit diagram of the structure of the motor of Embodiment 3.

[0026] Figure 9It is a top view showing the structure of the motor of Example 4.

[0027] Figure 10 It is a cross-sectional view showing the structure of the motor of Example 5. Detailed implementation mode

[0028] Hereinafter, with reference to the drawings, representative and non-limiting specific examples of the present disclosure will be described in detail. This detailed description is solely intended to show those skilled in the art the details of the preferred examples for implementing the present disclosure and is not intended to limit the scope of the present disclosure. In addition, in order to provide a further improved motor, the additional features disclosed below can be used separately or together with other features.

[0029] In addition, the combination of features and processes disclosed in the following detailed description is not essential in the broadest sense for implementing the present disclosure and is only described for the purpose of particularly illustrating representative specific examples of the present disclosure. And, when providing additional and useful embodiments of the present disclosure, the various features of the above-mentioned and following representative specific examples and the various features of the content recited in the independent and dependent claims do not have to be combined as in the specific examples described here or in the order listed.

[0030] All features recited in this specification and / or claims are intended to be separated from the features of the embodiments and / or claims in terms of structure and are disclosed separately and independently as limitations on the initially disclosed application and the specific matters claimed. And all recitations of numerical ranges and groups or clusters are intended to disclose the structures among them as limitations on the initially disclosed application and the specific matters claimed.

[0031] (Example) Refer to Figures 1 to 5 , the motor 10 of the example will be described. The motor 10 is, for example, a traveling motor of an electric vehicle. As Figure 2 shown, 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 U-phase AC power, the V-phase external connection terminal 30V is a terminal for inputting and outputting V-phase AC power, and the W-phase external connection terminal 30W is a terminal for inputting and outputting W-phase AC power. The motor 10 is driven by the U-phase, V-phase, and W-phase AC power supplied to the plurality of external connection terminals 30U, 30V, and 30W.

[0032] As Figures 1 to 3As shown, 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 an approximately 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.

[0033] Here, in this specification, a cylindrical coordinate system composed of an axial direction, a radial direction, and a circumferential direction is defined based on the central axis C of the motor 10. The axial direction is the direction parallel to the central axis C and is defined by a coordinate axis D1 parallel to the central axis C (see Figure 3 ). In this specification, sometimes the positive orientation of the coordinate axis D1 is expressed as one side of the axial direction, and the negative orientation of the coordinate axis D1 is expressed as the other side of the axial direction. The radial direction is the direction orthogonal to the central axis C and is defined by a coordinate axis D2 with the central axis C as the origin (see Figure 1 ). In this specification, sometimes the positive orientation of the coordinate axis D2 is expressed as the outer side of the radial direction, and the negative orientation of the coordinate axis D2 is expressed as the inner side of the radial direction. The circumferential direction is the direction perpendicular to the axial direction and the radial direction and is defined by a coordinate axis D3 that rotates around the central axis C (see Figure 1 ). In this specification, sometimes the positive orientation of the coordinate axis D3 is expressed as one side of the circumferential direction, and the negative orientation of the coordinate axis D3 is expressed as the other side of the circumferential direction.

[0034] The stator 16 is an approximately cylindrical member. The stator 16 is disposed on the outer side in the radial direction with respect to the rotor 14. The stator 16 has a stator core 18 and a plurality of coils 20. In the motor 10, AC power of U-phase, V-phase, and W-phase is input to and output from the plurality of coils 20 of the stator 16 from a plurality of external connection terminals 30U, 30V, 30W, whereby the rotor 14 and the shaft 12 rotate.

[0035] 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 also has an inner peripheral surface 18a and an outer peripheral surface 18b. The inner peripheral surface 18a is the surface on the inner side in the radial direction of the stator core 18 and extends in a cylindrical shape 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 sockets (not shown) arranged along the circumferential direction are formed on the inner peripheral surface 18a of the stator core 18. The outer peripheral surface 18b of the stator core 18 is the surface on the outer side in the radial direction of the stator core 18 and extends in a cylindrical shape along the circumferential direction. The outer peripheral surface 18b of the stator core 18 abuts against 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).

[0036] A plurality of coils 20 are arranged in the slots of the stator core 18. Specifically, the plurality of coils 20 (hereinafter, each coil 20) are arranged across two or more slots. Each coil 20 is a sectional coil and is composed of a conductor wire having a square cross section. In addition, the specific structure of the plurality of coils 20 is not particularly limited. For example, the plurality of coils 20 may have a concentrated winding structure or a distributed winding structure.

[0037] Although it is an example, the plurality of coils 20 include at least one U-phase coil 20U, at least one V-phase coil 20V, and at least one W-phase coil 20W (refer to Figure 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. Further, 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 to form a neutral point in the Y-connection. That is, the motor 10 of the present embodiment is a Y-connection type motor. In addition, in Figure 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 and are all illustrated as the first end 20a. As Figure 1 shown, the first end 20a of each coil 20 protrudes from the first end face 18e of the stator core 18 toward one side in the axial direction.

[0038] In addition, in addition to the above-described first end 20a, a part of the plurality of coils 20 protrudes from the first end face 18e of the stator core 18 toward one side in the axial direction. Such a part protruding from the first end face 18e of the stator core 18 is also referred to as a "coil end portion" as a part of the plurality of coils 20.

[0039] The plurality of bus bars 22 are each (hereinafter, each bus bar 22) formed of a conductor member such as metal, for example. Each bus bar 22 does not have the flexibility like a wire, but has a rigidity capable of maintaining its own shape by overcoming its own weight at least. In addition, a coating film formed of an insulating material such as resin may be provided on the surface of each bus bar 22. Each bus bar 22 electrically connects a corresponding one of the external connection terminals 30U, 30V, 30W and the first end 20a of a corresponding one of the coils 20. Although it is an example, the plurality of bus bars 22 include a U-phase bus bar 22U, a V-phase bus bar 22V, and a W-phase bus bar 22W (refer to Figure 2)。The U-phase bus bar 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 bus bar 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 bus bar 22W electrically connects between the W-phase external connection terminal 30W and the first end 20Wa of the W-phase coil 20W. In addition, in Figure 1 , the U-phase bus bar 22U, the V-phase bus bar 22V, and the W-phase bus bar 22W are not distinguished, and all of them are illustrated as the bus bar 22.

[0040] Each bus bar 22 has an extension portion 22e and a connection portion 22c. In each bus bar 22, the extension portion 22e is a portion extending in the circumferential direction. The extension portion 22e is electrically connected to a corresponding one of the external connection terminals 30U, 30V, 30W. Specifically, the extension portion 22Ue of the U-phase bus bar 22U is electrically connected to the U-phase external connection terminal 30U. The extension portion 22Ve of the V-phase bus bar 22V is electrically connected to the V-phase external connection terminal 30V. The extension portion 22We of the W-phase bus bar 22W is electrically connected to the W-phase external connection terminal 30W.

[0041] In each bus bar 22, the connection portion 22c extends from the extension portion 22e toward the radially inner side. The connection portion 22c of each bus bar 22 is electrically connected to the first end 20a of a corresponding one of the coils 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 are opposed to each other in the radial direction.

[0042] A plurality of bus bar holders 24, 26 hold a plurality of bus bars 22. The plurality of bus bar holders 24, 26 each (hereinafter referred to as each bus bar holder 24, 26) has an approximate cube shape. Each of the bus bar holders 24, 26 is formed of an insulating material such as resin. The plurality of bus bar holders 24, 26 are arranged along the circumferential direction, and the extension portion 22e of each bus bar 22 extends between one or more bus bar holders 24, 26. As Figures 3 to 5 shown, each bus bar holder 24, 26 is located on the radially outer side with respect to the first end 20a of a corresponding one of the coils 20. Moreover, in each bus bar holder 24, 26, the connection portion 22c of a corresponding one of the bus bars 22 extends toward the first end 20a of a corresponding one of the coils 20 and is connected to the first end 20a.

[0043] The plurality of bus bar holders 24, 26 include two first bus bar holders 24 and a plurality of second bus bar holders 26. The two first bus bar holders 24 respectively (hereinafter referred to as each first bus bar holder 24) protrude radially outward from the outer peripheral surface 18b of the stator core 18. The plurality of second bus bar holders 26 respectively (hereinafter referred to as each second bus bar holder 26) protrude radially outward with respect to 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.

[0044] As described above, the plurality of bus bar holders 24, 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 the present embodiment, the two first bus bar holders 24 are arranged at an interval of 180 degrees in the circumferential direction.

[0045] Although it is an example, as Figures 3 to 5 shown, the plurality of bus bars 22 are arranged along the axial direction. The plurality of bus bars 22 are arranged in the order of the U-phase bus bar 22U, the V-phase bus bar 22V, and the W-phase bus bar 22W from one side to the other side in the axial direction. The circumferential positions of the connection portions 22Uc, 22Vc, 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 and are located at different bus bar holders 24, 26.

[0046] Specifically, as Figure 3 shown, in one of the two first bus bar holders 24, the extending portions 22Ue, 22Ve, 22We of the U-phase bus bar 22U, the V-phase bus bar 22V, and the W-phase bus bar 22W are held. Moreover, the connection portion 22Uc of the U-phase bus bar 22U extends from this 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 Figure 4 shown, in one of the plurality of second bus bar holders 26, the extending portions 22Ve, 22We of the V-phase bus bar 22V and the W-phase bus bar 22W are held. Moreover, the connection portion 22Vc of the V-phase bus bar 22V extends from this 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 Figure 5 shown, in the other of the plurality of second bus bar holders 26, the extending portion 22We of the W-phase bus bar 22W is held. Moreover, the connection portion 22Wc of the W-phase bus bar 22W extends from this 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.

[0047] The housing 28 is located radially outside the stator core 18. The housing 28 is an approximately cylindrical housing member. The housing 28 has an inner circumferential surface 28a located radially inside and an outer circumferential surface 28b located radially outside. The housing 28 contacts the outer circumferential surface 18b of the stator core 18 and the two first bus bar holders 24 on the inner circumferential surface 28a. Thus, the housing 28 holds the stator core 18 and the plurality of first bus bar holders 24 from the radially outside. On the other hand, the housing 28 does not contact the plurality of second bus bar holders 26.

[0048] As described above, each of the first bus bar holders 24 is located radially outside the first end 20a of the corresponding one coil 20. Moreover, in each of the first bus bar holders 24, the connecting portion 22c of the corresponding one bus bar 22 is connected to the first end 20a of the corresponding one coil 20 from the radially outside. According to such a structure, the radial holding force acting on each of the first bus bar holders 24 from the housing 28 is easily transmitted to the stator core 18 via the connecting portion between the bus bar 22 and the coil 20. That is, the holding force acting on each of the first bus bar holders 24 from the housing 28 can also be used as the force for holding the stator core 18. Thus, 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., deformation) generated in the stator core 18 is suppressed, and the magnetic loss in the stator core 18 is reduced. In addition, in Figure 3 In the first bus bar holder 24 shown, the connecting portion 22c of the U-phase bus bar 22U is provided, but on this basis, or instead, the connecting portion 22Vc of the V-phase bus bar 22V and / or the connecting portion 22Wc of the W-phase bus bar 22W may be provided.

[0049] In addition, the number of the first bus bar holders 24 is not limited to two, and may be one or three or more. Among them, in the case where 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 structure, the housing 28 can hold the stator core 18 more stably via the plurality of first bus bar holders 24.

[0050] Although it is an example, in this embodiment, the housing 28 is fixed to the stator core 18 and the two first bus bar holders 24 by press-fitting. Therefore, the housing 28 holds the stator core 18 and the first bus bar holder 24 by interference fit. The stator core 18 and the first bus bar holder 24 apply stress from the housing 28 toward the radially inside. According to such a structure, whether by press-fitting or not, the housing 28 can firmly hold the stator core 18 and the two first bus bar holders 24.

[0051] Although this is just one example, the housing 28 has two recesses 28r. The two recesses 28r respectively (hereinafter referred to as each recess 28r) are recessed radially outward from the inner peripheral 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 contacts the housing 28 from the radial inner side within a corresponding one of the recesses 28r. According to such a structure, when manufacturing the motor 10, by aligning the positions of the respective first bus bar holders 24 with a corresponding one of the recesses 28r of the housing 28, the positioning of the stator core 18 relative to the housing 28 can be easily performed.

[0052] Although this is just one example, each first bus bar holder 24 contacts the housing 28 from one side in the axial direction within a corresponding one of the recesses 28r. According to such a structure, the positioning of the stator core 18 relative to the housing 28 can be performed with high precision in the axial direction. In addition, as another embodiment, each first bus bar holder 24 may also contact the housing 28 from the other side in the axial direction within a corresponding one of the recesses 28r. Alternatively, each first bus bar holder 24 may also contact the housing 28 from both sides in the axial direction within a corresponding one of the recesses 28r. Among them, in the motor 10 of the present embodiment, each recess 28r extends to the end face 28e on one side in the axial direction of the housing 28. According to such a structure, when manufacturing the motor 10, it is easy to arrange each first bus bar holder 24 within a corresponding one of the recesses 28r.

[0053] Although this is just one example, each first bus bar holder 24 contacts the housing 28 from both sides in the circumferential direction within a corresponding one of the recesses 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 structure, the positioning of the stator core 18 relative to the housing 28 can be performed with high precision in the circumferential direction. In addition, each first bus bar holder 24 only needs to contact the housing 28 from at least one side in the circumferential direction within a corresponding one of the recesses 28r.

[0054] Although this is just one example, as shown in Figure 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. In addition, it is not limited to this one first bus bar holder 24, and two or more bus bars 22 may also be held by another first bus bar holder 24, one or more second bus bar holders 26.

[0055] Here, the correspondence between the structure in the motor 10 of the present embodiment and the structure of the motor related to the present technology is shown. The U-phase coil 20U, the V-phase coil 20V, and the W-phase coil 20W in the present embodiment are examples of the "coil" in the present embodiment. The plurality of first bus bar holders 24 in the present embodiment are examples of the "bus bar holder" in the present technology. In addition, the first end 20Ua of the U-phase coil 20U, the first end 20Va of the V-phase coil 20V, and the first end 20Wa of the W-phase coil 20W in the present embodiment are examples of the "one end of the coil" in the present technology. The U-phase bus bar 22U, its extension 22Ue, and the connection part 22Uc in the present embodiment are examples of the "bus bar", "extension", and "connection part" in the present technology. The V-phase bus bar 22V, its extension 22Ve, and the connection part 22Vc in the present embodiment are examples of the "bus bar", "extension", and "connection part" in the present technology. The W-phase bus bar 22W, its extension 22We, and the connection part 22Wc in the present embodiment are examples of the "bus bar", "extension", and "connection part" in the present technology.

[0056] (Embodiment 2) Refer to Figure 6 , Figure 7 , and the motor 100 of Embodiment 2 will be described. As Figure 6 shown, in addition to the plurality of bus bars 22 in Embodiment 1, the motor 100 of Embodiment 2 further includes a neutral point bus bar 122. The motor 100 of Embodiment 2 is different from the motor 10 of Embodiment 1 in this regard. The neutral point bus bar 122 is a bus bar that constitutes the neutral point. The neutral point bus bar 122 electrically connects the second ends 20b of the plurality of coils 20 to each other. Specifically, the neutral point bus bar 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. In addition, the motor 100 of Embodiment 2 is the same as Embodiment 1 and has a plurality of external connection terminals 30U, 30V, and 30W.

[0057] The neutral point bus bar 122 has an extension 122e and a plurality of connection parts 122c. The extension 122e of the neutral point bus bar 122 extends in the circumferential direction. The plurality of connection parts 122c respectively extend from the extension 122e toward the inner side in the radial direction. Specifically, as Figure 7As shown, in a first bus bar holding member 24, an extension portion 122e of a neutral point bus bar 122 is held together with extension portions 22Ue, 22Ve, and 22We of a U-phase bus bar 22U, a V-phase bus bar 22V, and a W-phase bus bar 22W. Moreover, a plurality of connection portions 122c of the neutral point bus bar 122 extend from the first bus bar holding member 24 respectively, and are connected to a second end 20b of any one of a plurality of coils 20 from the outer side in the radial direction. That is, the second end 20b is any one of a second end 20Ub of a U-phase coil 20U, a second end 20Vb of a V-phase coil 20V, and a second end 20Wb of a W-phase coil 20W. In addition, the neutral point bus bar 122, the extension portion 122e, and the connection portion 122c in this embodiment are each an example of a "bus bar", an "extension portion", and a "connection portion" in the present 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 an "end of a coil" in the present technology.

[0058] (Embodiment 3) Refer to Figure 8 , and the motor 200 of Embodiment 3 will be described. As Figure 8 shown, in the motor 200 of Embodiment 3, in addition to the plurality of external connection terminals 30U, 30V, and 30W of Embodiment 2, a plurality of external connection terminals 30U, 30V, 30W, 230N further include a neutral point external connection terminal 230N. And the motor 200 of Embodiment 3 includes a neutral point bus bar 222 instead of the neutral point bus bar 122 in Embodiment 2. The neutral point bus bar 222 has an extension portion 222e and has a plurality of connection portions 122c in the same manner as in Embodiment 2. The extension portion 222e of the neutral point bus bar 222 is electrically connected to the neutral point external connection terminal 230N. The neutral point 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, at these points, the motor 200 of Embodiment 3 is different from Embodiment 2. In addition, the neutral point external connection terminal 230N is an example of an "external connection terminal" in the present technology.

[0059] (Embodiment 4) Refer to Figure 9 , and the motor 300 of Embodiment 4 will be described. As Figure 9 shown, the motor 300 of Embodiment 4 includes four first bus bar holding members 24, and in this regard, it is different from the motor 10 of Embodiment 1. The four first bus bar holding members 24 are arranged at equal intervals in the circumferential direction. That is, in Embodiment 4, the four first bus bar holding members 24 are arranged at intervals of 90 degrees in the circumferential direction. According to such a structure, the housing 28 can hold the stator core 18 more stably via the plurality of first bus bar holding members 24.

[0060] (Example 5) Refer to Figure 10 , and the motor 400 of Example 5 will be described. As Figure 10 shown, in the motor 400 of Example 5, the structure of one of the two recesses 28r in Example 1 is changed, and in this regard, it is different from the motor 10 of Example 1. 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, this 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. With such a structure, the positioning of the stator core 18 relative to the housing 28 can be performed with high precision. Among them, as another embodiment, for the plurality of recesses of the housing 28, all of them may be the second recess 428r.

[0061] In all of the above embodiments, the plurality of first bus bar holders 24 contact the housing 28 in the corresponding recesses 28r, 428r respectively. In contrast, as another embodiment, the plurality of first bus bar holders 24 may also contact the housing 28 in one recess. In this case, the inner peripheral surface 28a of the housing 28 may also have a recess that is long in the circumferential direction. Additionally, as yet another embodiment, the housing 28 may not have the recesses 28r, 428r.

[0062] In the drawings, eight bus bar holders 24, 26 are illustrated, but the number of the bus bar holders 24, 26 is not limited thereto. The number of the bus bar holders 24, 26 can be appropriately changed according to the structure of the motor.

Claims

1. A motor, characterized in that: The motor includes: A cylindrical stator core; A coil disposed on the stator core; A bus bar configured to be connected to one end of the coil protruding from an end face of the stator core, the bus bar having a connection portion connected from the outer side in the radial direction to the one end of the coil; At least one bus bar holder configured to hold the bus bar and located on the outer side in the radial direction with respect to the one end of the coil; and A housing configured to hold the stator core and the at least one bus bar holder from the outer side in the radial direction, wherein the connection portion extends from the bus bar holder.

2. The motor according to claim 1, characterized in that: The housing has a recess for accommodating at least a part of the bus bar holder, and the bus bar holder contacts the housing from the inner side in the radial direction within the recess.

3. The motor according to claim 2, characterized in that: The bus bar holder contacts the housing from at least one side in the axial direction within the recess.

4. The motor according to claim 2, characterized in that: The bus bar holder contacts the housing from at least one side in the circumferential direction within the recess.

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

6. The motor according to claim 1, characterized in that: The bus bar has an extension portion extending along the circumferential direction, and the at least one bus bar holder includes a plurality of bus bar holders that hold the extension portion of the bus bar and are held by the housing from the outer side in the radial direction.

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

8. The motor according to claim 1, characterized in that: The bus bar is a bus bar configured to electrically connect an external connection terminal of the motor to the one end of the coil.

9. The motor according to claim 8, characterized in that: 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, and the one end of the coil is the input / output side end of any one of a U-phase coil, a V-phase coil, and a W-phase coil.

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

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

12. The motor according to claim 1, characterized in that: The bus bar holder holds a plurality of bus bars including the bus bar.

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