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, it is difficult for the radial holding force acting on the bus bar holder 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 herein is embodied in a motor. This motor may comprise a cylindrical stator core, a coil disposed on the stator core, a busbar connected to one end of the coil protruding from the end face of the stator core, at least one busbar holder for holding the busbar, and a housing for holding the stator core and the at least one busbar holder from the radially outward direction. The busbar holder may be located radially outward from the one end of the coil. The busbar may have a connecting portion extending from the busbar holder. The connecting portion may be connected radially outward from the one end of the coil.

[0006] In the motor described above, the busbar holder is located radially between one end of the coil and the housing. The busbar connecting to the busbar holder is connected to one end of the coil from the radial outside. With this configuration, the radial holding force acting from the housing to the busbar holder is easily transmitted to the stator core via the connection between the busbar and the coil. In other words, the holding force acting from the housing to the busbar holder can also be used as a holding force for the stator core. This makes it possible to reduce, for example, the holding force acting directly from the housing to the stator core. 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 explanation of the drawing]

[0007] [Figure 1] This is a plan view showing the configuration of the motor in Example 1. [Figure 2] The circuit diagram of the motor in Example 1 is shown. [Figure 3] This is a cross-sectional view taken along line III-III in Figure 1. The shaft 12 and rotor 14 are not shown. [Figure 4] This is a cross-sectional view along the line IV-IV in Figure 1. The shaft 12 and rotor 14 are not shown. [Figure 5]This is a cross-sectional view along the VV line in Figure 1. The shaft 12 and rotor 14 are not shown. [Figure 6] This is a circuit diagram showing the configuration of the motor in Example 2. [Figure 7] This is a cross-sectional view showing the configuration of the motor in Example 2. [Figure 8] This is a circuit diagram showing the configuration of the motor in Example 3. [Figure 9] This is a plan view showing the configuration of the motor in Example 4. [Figure 10] This is a cross-sectional view showing the configuration of the motor in Example 5. [Modes for carrying out the invention]

[0008] In a first aspect of this technology, as previously described, the motor may comprise a cylindrical stator core, a coil disposed on the stator core, a busbar connected to one end of the coil protruding from the end face of the stator core, at least one busbar holder for holding the busbar, and a housing for holding the stator core and the at least one busbar holder from the radially outward direction. The busbar holder may be located radially outward from the one end of the coil. The busbar may have a connecting portion extending from the busbar holder. The connecting portion may be connected radially outward from the one end of the coil.

[0009] In a second aspect of this technology, in addition to the first aspect described above, the housing may have a recess that accommodates at least a portion of the busbar holder. In this case, the busbar holder may contact the housing from the radially inner side within the recess. With this configuration, the position of the stator core relative to the housing can be easily achieved by aligning the position of the busbar holder with the recess of the housing.

[0010] In a third aspect of this technology, in addition to the second aspect described above, the busbar holder may contact the housing from at least one side in the axial direction within the recess. With this configuration, the stator core can be precisely positioned relative to the housing in the axial direction.

[0011] In a fourth aspect of this technology, in addition to the second or third aspect described above, the busbar holder may contact the housing from at least one side in the circumferential direction within the recess. With this configuration, the stator core can be precisely positioned relative to the housing in the circumferential direction.

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

[0013] In a sixth aspect of this technology, in addition to any one of the first to fifth aspects described above, the busbar may have an extended portion that extends along the circumferential direction. In this case, the at least one busbar holder may hold the extended portion of the busbar and may also include a plurality of busbar holders held by the housing from the radially outside. With such a configuration, the housing can stably hold the stator core via the plurality of busbar holders.

[0014] In a seventh aspect of this technology, in addition to the sixth aspect described above, the multiple busbar holders may be arranged at equal intervals in the circumferential direction. With this configuration, the housing can hold the stator core more stably via the multiple busbar holders.

[0015] In an 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 an external connection terminal of the motor and one end of the coil.

[0016] In a 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 a 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 an eleventh aspect of the present technology, in addition to any one of the above-described first aspect to 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 a twelfth aspect of the present technology, in addition to any one of the above-described first aspect to eleventh aspect, the bus bar holder may hold a plurality of bus bars including the above-described bus bar. By holding a plurality of bus bars by the bus bar holder, 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 examples of the present invention will be described in detail with reference to the drawings. This detailed description is intended simply to show those skilled in the art details for carrying out preferred examples of the present invention and is not intended to limit the scope of the present invention. Furthermore, additional features and inventions disclosed below may be used separately from or in conjunction with other features and inventions to provide a further improved motor.

[0021] Furthermore, the combinations of features and processes disclosed in the following detailed description are not essential for carrying out the present invention in the broadest sense, and are described solely to illustrate representative examples of the present invention. Moreover, the various features of the representative examples described above and below, as well as the various features described in the independent and dependent claims, do not necessarily have to be combined in the same way as the examples described herein or in the order listed, in order to provide additional and useful embodiments of the present invention.

[0022] All features described herein and / or in the claims are intended to be disclosed individually and independently of each other, as limitations to the original disclosure and claimed specific subject matter, separate from the features described in the examples and / or claims. Furthermore, all descriptions of numerical ranges and groups or clusters are intended to disclose intermediate configurations as limitations to the original disclosure and claimed specific subject matter.

[0023] (Example) The motor 10 of the example will be described with reference to Figures 1 to 5. The motor 10 is, for example, a motor for driving an electric vehicle. As shown in Figure 2, the motor 10 is, for example, a three-phase motor. The motor 10 is equipped with 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 to which U-phase AC power is input and output, the V-phase external connection terminal 30V is a terminal to which V-phase AC power is input and output, and the W-phase external connection terminal 30W is a terminal to which W-phase AC power is input and output. 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.

[0024] As shown in Figures 1 to 3, the motor 10 comprises 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 with the shaft 12 with the central axis C as the center of rotation.

[0025] Herein, in this specification, a cylindrical coordinate system consisting of axial, radial, and circumferential directions is defined with respect to the central axis C of the motor 10. The axial direction is the direction parallel to the central axis C and is defined by coordinate axis D1, which is parallel to the central axis C (see Figure 3). In this specification, the positive direction of coordinate axis D1 may be expressed as one side of the axial direction, and the negative direction of coordinate axis D1 may be expressed as the other side of the axial direction. The radial direction is the direction perpendicular to the central axis C and is defined by coordinate axis D2, which has the central axis C as its origin (see Figure 1). In this specification, the positive direction of coordinate axis D2 may be expressed as the outer side of the radial direction, and the negative direction of coordinate axis D2 may be expressed as the inner side of the radial direction. The circumferential direction is the direction perpendicular to the axial and radial directions and is defined by coordinate axis D3, which orbits around the central axis C (see Figure 1). In this specification, the positive direction of coordinate axis D3 may be expressed as one side of the circumferential direction, and the negative direction of coordinate axis D3 may be expressed as the other side of the circumferential direction.

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

[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 axially from the first end face 18e to the second end face. The stator core 18 further has an inner circumferential surface 18a and an outer circumferential surface 18b. The inner circumferential surface 18a is the radially inner surface of the stator core 18 and extends cylindrically along the circumferential direction. The inner circumferential surface 18a of the stator core 18 defines a through hole that accommodates at least a portion of the rotor 14. The inner circumferential surface 18a of the stator core 18 has a plurality of slots (not shown) arranged along the circumferential direction. The outer circumferential 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 circumferential surface 18b of the stator core 18 abuts against the housing 28. The inner circumferential surface 18a and the outer circumferential surface 18b extend axially between the first end face 18e and the second end face (not shown).

[0028] Multiple coils 20 are arranged in slots of the stator core 18. More specifically, each of the multiple coils 20 (hereinafter referred to as "each coil 20") is arranged across two or more slots. Each coil 20 is a segment coil and is made of a conductor wire having a rectangular cross-section. The specific configuration of the multiple coils 20 is not particularly limited. For example, the multiple coils 20 may have a concentrated winding configuration or a distributed winding configuration.

[0029] As an example, the multiple 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 (see Figure 2). The U-phase coil 20U has a first terminal 20Ua on the input / output side and a second terminal 20Ub on the neutral point side. The V-phase coil 20V has a first terminal 20Va on the input / output side and a second terminal 20Vb on the neutral point side. The W-phase coil 20W has a first terminal 20Wa on the input / output side and a second terminal 20Wb on the neutral point side. The second terminals 20Ub, 20Vb, and 20Wb of each coil 20U, 20V, and 20W are electrically connected to each other and form the neutral point in a Y-connection. In other words, the motor 10 in this embodiment is a Y-connection type motor. In Figure 1, 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 are not distinguished and are all shown as the first end 20a. As shown in Figure 1, the first end 20a of each coil 20 protrudes from the first end face 18e of the stator core 18 to one side in the axial direction.

[0030] In addition to the first end 20a described above, some of the coils 20 protrude from the first end face 18e of the stator core 18 to one side in the axial direction. These protruding portions from the first end face 18e of the stator core 18 are also referred to as "coil ends" as part of the coils 20.

[0031] Each of the multiple busbars 22 (hereinafter referred to as "each busbar 22") is constructed using a conductive material such as metal. Each busbar 22 does not have the flexibility of a wire and has rigidity that can maintain its shape against its own weight. The surface of each busbar 22 may be provided with a coating made of an insulating material such as resin. Each busbar 22 is electrically connected to a corresponding external connection terminal 30U, 30V, or 30W and to the first end 20a of a corresponding coil 20. As an example, the multiple busbars 22 include a U-phase busbar 22U, a V-phase busbar 22V, and a W-phase busbar 22W (see Figure 2). The U-phase busbar 22U is electrically connected to the U-phase external connection terminal 30U and to the first end 20Ua of the U-phase coil 20U. The V-phase busbar 22V electrically connects the V-phase external connection terminal 30V to the first terminal 20Va of the V-phase coil 20V. The W-phase busbar 22W electrically connects the W-phase external connection terminal 30W to the first terminal 20Wa of the W-phase coil 20W. Note that in Figure 1, the U-phase busbar 22U, V-phase busbar 22V, and W-phase busbar 22W are not distinguished and are all shown as busbar 22.

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

[0033] Each Busba 22In this configuration, the connection portion 22c extends radially inward from the extension portion 22e. Each busbar 22's connection portion 22c is electrically connected to the first end 20a of a corresponding coil 20. Specifically, the connection portion 22Uc of the U-phase busbar 22U is electrically connected to the first end 20Ua of the U-phase coil 20U. The connection portion 22Vc of the V-phase busbar 22V is electrically connected to the first end 20Va of the V-phase coil 20V. The connection portion 22Wc of the W-phase busbar 22W is electrically connected to the first end 20Wa of the W-phase coil 20W. Here, the connection portion 22c of each busbar 22 and the first end 20a of the coil 20 connected to it face each other in the radial direction.

[0034] Multiple busbar holders 24, 26 hold multiple busbars 22. Each of the multiple busbar holders 24, 26 (hereinafter referred to as each busbar holder 24, 26) generally has a rectangular parallelepiped shape. Each busbar holder 24, 26 is constructed using an insulating material such as resin. The multiple busbar holders 24, 26 are arranged along the circumferential direction, and the extended portion 22e of each busbar 22 extends between one or more busbar holders 24, 26. As shown in Figures 3-5, each busbar holder 24, 26 is located radially outward with respect to the first end 20a of a corresponding coil 20. In each busbar holder 24, 26, the connecting portion 22c of a corresponding busbar 22 extends toward and is connected to the first end 20a of the corresponding coil 20.

[0035] The multiple busbar holders 24, 26 include two first busbar holders 24 and multiple second busbar holders 26. Each of the two first busbar holders 24 (hereinafter referred to as each first busbar holder 24) protrudes radially outward from the outer circumferential surface 18b of the stator core 18. Each of the multiple second busbar holders 26 (hereinafter referred to as each second busbar holder 26) protrudes radially outward from the outer circumferential surface 18b of the stator core 18. The radial dimension of each first busbar holder 24 is greater than the radial dimension of each second busbar holder 26.

[0036] As mentioned above, the multiple busbar holders 24 and 26 are arranged along the circumferential direction. Among them, the two first busbar holders 24 are arranged at equal intervals in the circumferential direction. That is, in this embodiment, the two first busbar holders 24 are arranged at a 180-degree interval in the circumferential direction.

[0037] As an example, as shown in Figures 3-5, multiple busbars 22 are arranged along the axial direction. The multiple busbars 22 are arranged in the order of U-phase busbar 22U, V-phase busbar 22V, and W-phase busbar 22W, from one side to the other in the axial direction. The connection portions 22Uc, 22Vc, and 22Wc of the U-phase busbar 22U, V-phase busbar 22V, and W-phase busbar 22W are at different positions in the circumferential direction and are located on different busbar holders 24 and 26.

[0038] Specifically, as shown in Figure 3, one of the two first busbar holders 24 holds the extended portions 22Ue, 22Ve, and 22We of the U-phase busbar 22U, V-phase busbar 22V, and W-phase busbar 22W. The connection portion 22Uc of the U-phase busbar 22U extends from this one first busbar holder 24 and is connected to the first end 20Ua of the U-phase coil 20U from the radially outside. As shown in Figure 4, one of the multiple second busbar holders 26 holds the extended portions 22Ve and 22We of the V-phase busbar 22V and W-phase busbar 22W. The connection portion 22Vc of the V-phase busbar 22V extends from this one second busbar holder 26 and is connected to the first end 20Va of the V-phase coil 20V from the radially outside. As shown in Figure 5, in one of the other second busbar holders 26, the extended portion 22We of the W-phase busbar 22W is held. The connection portion 22Wc of the W-phase busbar 22W extends from this other second busbar holder 26 and is connected to the first end 20Wa of the W-phase coil 20W from the radially outer side.

[0039] The housing 28 is located radially outward relative to the stator core 18. The housing 28 is generally a cylindrical housing member. The housing 28 has an inner circumferential surface 28a located radially inward and an outer circumferential surface 28b located radially outward. The housing 28 is in contact with the outer circumferential surface 18b of the stator core 18 and the two first busbar holders 24 at the inner circumferential surface 28a. In this way, the housing 28 holds the stator core 18 and the multiple first busbar holders 24 from radially outward. On the other hand, the housing 28 is not in contact with the multiple second busbar holders 26.

[0040] As described above, each first busbar holder 24 is located radially outward from the first end 20a of the corresponding coil 20. In each first busbar holder 24, the connection portion 22c of the corresponding busbar 22 is connected radially outward from the first end 20a of the corresponding coil 20. With this configuration, the radial holding force acting from the housing 28 on each first busbar holder 24 is easily transmitted to the stator core 18 via the connection portion between the busbar 22 and the coil 20. In other words, the holding force acting from the housing 28 on each first busbar holder 24 can also be used as a holding force for the stator core 18. This makes it possible to reduce, for example, the holding force directly acting from the housing 28 on the stator core 18. In this case, stress (i.e., strain) generated in the stator core 18 is suppressed, and magnetic loss in the stator core 18 is reduced. In the first busbar holder 24 shown in Figure 3, a connection portion 22c for the U-phase busbar 22U is provided, but in addition to this, or instead, a connection portion 22Vc for the V-phase busbar 22V and / or a connection portion 22Wc for the W-phase busbar 22W may also be provided.

[0041] The number of first busbar holders 24 is not limited to two; there may be one or three or more. However, if there are multiple first busbar holders 24, it is preferable that they be arranged at equal intervals in the circumferential direction. With such a configuration, the housing 28 can hold the stator core 18 more stably via the multiple first busbar holders 24.

[0042] In this embodiment, the housing 28 is fixed to the stator core 18 and the two first busbar holders 24 by shrink fitting. Thus, the housing 28 holds the stator core 18 and the first busbar holders 24 by interference fit. The stator core 18 and the first busbar holders 24 are subjected to stress directed radially inward from the housing 28. With this configuration, the housing 28 can firmly hold the stator core 18 and the two first busbar holders 24, regardless of whether shrink fitting is used or not.

[0043] For 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 accommodates at least a portion of the corresponding first busbar holder 24. In other words, each first busbar holder 24 is in contact with the housing 28 from the radially inward side within the corresponding recess 28r. With this configuration, when manufacturing the motor 10, the position of each first busbar holder 24 can be easily adjusted relative to the housing 28 by aligning the position of each first busbar holder 24 with the corresponding recess 28r of the housing 28.

[0044] For example, each first busbar holder 24 contacts the housing 28 from one axial side within a corresponding recess 28r. With this configuration, the stator core 18 can be precisely positioned relative to the housing 28 in the axial direction. In other embodiments, each first busbar holder 24 may contact the housing 28 from the other axial side within a corresponding recess 28r. Alternatively, each first busbar holder 24 may contact the housing 28 from both axial sides within a corresponding recess 28r. However, in the motor 10 of this embodiment, each recess 28r extends to one axial end face 28e of the housing 28. With this configuration, it is easy to position each first busbar holder 24 within a corresponding recess 28r when manufacturing the motor 10.

[0045] For example, each first busbar holder 24 contacts the housing 28 from both sides in the circumferential direction within a corresponding recess 28r. That is, the circumferential dimensions of the first busbar holder 24 are substantially equal to the circumferential dimensions of the recess 28r. With this configuration, the stator core 18 can be positioned with high accuracy in the circumferential direction relative to the housing 28. Note that each first busbar holder 24 only needs to contact the housing 28 from at least one side in the circumferential direction within a corresponding recess 28r.

[0046] As an example, as shown in Figure 3, one of the two first busbar holders 24 holds three busbars 22. By having the first busbar holder 24 hold multiple busbars 22, the rigidity of the first busbar holder 24 and the overall rigidity of the multiple busbar holders 24, 26 connected by multiple busbars 22 are relatively high. This allows the holding force acting from the housing 28 to the first busbar holder 24 to be transmitted to the stator core 18 more reliably. Note that this is not limited to the one first busbar holder 24, but the other first busbar holder 24 or one or more second busbar holders 26 may also hold two or more busbars 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. The U-phase coil 20U, V-phase coil 20V, and W-phase coil 20W in this embodiment are examples of "coils" in this embodiment. The multiple first busbar holders 24 in this embodiment are examples of "busbar holders" in the present technology. Also, 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 this embodiment are examples of "one end of a coil" in the present technology. The U-phase busbar 22U, its extension 22Ue, and its connecting part 22Uc in this embodiment are examples of "busbars," "extensions," and "connecting parts" in the present technology. The V-phase busbar 22V, its extension 22Ve, and its connecting part 22Vc in this embodiment are examples of "busbars," "extensions," and "connecting parts" in the present technology. The W-phase busbar 22W, its extension 22We, and its connecting portion 22Wc in this embodiment are examples of the "busbar," "extension portion," and "connecting portion" in this technology.

[0048] (Example 2) The motor 100 of Example 2 will be described with reference to Figures 6 and 7. As shown in Figure 6, the motor 100 of Example 2 further includes a neutral point busbar 122 in addition to the multiple busbars 22 in Example 1. In this respect, the motor 100 of Example 2 differs from the motor 10 of Example 1. 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 multiple 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. The motor 100 of Example 2 has multiple external connection terminals 30U, 30V, and 30W, similar to Example 1.

[0049] The neutral point busbar 122 has an extended portion 122e and a plurality of connecting portions 122c. The extended portion 122e of the neutral point busbar 122 extends in the circumferential direction. Each of the plurality of connecting portions 122c extends radially inward from the extended portion 122e. Specifically, as shown in Figure 7, in one first busbar holder 24, the neutral point busbar 122 is connected together with the extended portions 22Ue, 22Ve, and 22We of the U-phase busbar 22U, V-phase busbar 22V, and W-phase busbar 22W. extension portion 122e The neutral point busbar 122 is held in place. Each of the multiple connection portions 122c of the neutral point busbar 122 extends from the first busbar holder 24 and is connected from the radially outer side to the second end 20b of one of the multiple coils 20. That is, the second end 20b is 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. In this embodiment, the neutral point busbar 122, the extension portion 122e, and the connection portion 122c are examples of "busbar," "extension portion," and "connection portion," respectively, in this technology. In this embodiment, the second end 20b of the coil 20, i.e., 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 examples of "one end of a coil" in this technology.

[0050] (Example 3) The motor 200 of Example 3 will be described with reference to Figure 8. As shown in Figure 8, in the motor 200 of Example 3, the multiple external connection terminals 30U, 30V, 30W, and 230N include a neutral point external connection terminal 230N in addition to the multiple external connection terminals 30U, 30V, and 30W of Example 2. Furthermore, the motor 200 of Example 3 is equipped with a neutral point busbar 222 instead of the neutral point busbar 122 in Example 2. The neutral point busbar 222 has an extended portion 222e and multiple connection portions 122c, similar to Example 2. The extended portion 222e of the neutral point busbar 222 is electrically connected to the neutral point external connection terminal 230N. The neutral point busbar 222 electrically connects the second end 20b of the coil 20 to the neutral point external connection terminal 230N of the motor 300. In other words, the motor 200 of Example 3 differs from that of Example 2 in these respects. The neutral point external connection terminal 230N is an example of an "external connection terminal" in this technology.

[0051] (Example 4) The motor 300 of Example 4 will be described with reference to Figure 9. As shown in Figure 9, the motor 300 of Example 4 is equipped with four first busbar holders 24, which distinguishes it from the motor 10 of Example 1. The four first busbar holders 24 are arranged at equal intervals in the circumferential direction. That is, in Example 4, the four first busbar holders 24 are arranged at 90-degree intervals in the circumferential direction. With this configuration, the housing 28 can hold the stator core 18 more stably via the multiple first busbar holders 24.

[0052] (Example 5) The motor 400 of Example 5 will be described with reference to Figure 10. As shown in Figure 10, the motor 400 of Example 5 differs from the motor 10 of Example 1 in that the configuration of one of the two recesses 28r in Example 1 has been changed. The motor 400 has a recess 28r and a second recess 428r. The second recess 428r is provided only in the area facing one of the two first busbar holders 24. In this case, the first busbar holder 24 has a housing 28 within the second recess 428r, radially inward and on both sides in the axial direction. and Contact is made from both sides in the circumferential direction. With this configuration, the stator core 18 can be positioned with high precision relative to the housing 28. However, in another embodiment, the second recess 428r may be used for all of the multiple recesses of the housing 28.

[0053] In all the embodiments described above, each of the multiple first busbar holders 24 contacts the housing 28 in the corresponding recesses 28r, 428r. In contrast, in another embodiment, the multiple first busbar holders 24 may contact the housing 28 in a single recess. In this case, the inner circumferential surface 28a of the housing 28 may have a recess that is elongated in the circumferential direction. Furthermore, in yet another embodiment, the housing 28 has a recess 28r 、428r It is not necessary to have it.

[0054] The drawing shows eight busbar holders 24 and 26 as an example, but the number of busbar holders 24 and 26 is not limited to this. The number of busbar holders 24 and 26 can be changed as appropriate depending on the motor configuration. [Explanation of Symbols]

[0055] 10, 100, 200, 300, 400: Motor, 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: Busbar, 22c: Connection part, 22e: Extension part, 22U: U-phase busbar, 22Uc: U-phase busbar 122,222: Connection part, 22Ue: Extension of U-phase busbar, 22V: V-phase busbar, 22Vc: Connection part of V-phase busbar, 22Ve: Extension of V-phase busbar, 22W: W-phase busbar, 22Wc: Connection part of W-phase busbar, 22We: Extension of U-phase busbar, 24: First busbar holder, 26: Second busbar 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 busbar, 122c: Connection part of neutral point busbar, 122e,222e: Extension of neutral point busbar, 230N: Neutral point external connection terminal, C: Central axis

Claims

1. A cylindrical stator core, A coil arranged in the stator core, A busbar connected to one end of the coil protruding from the end face of the stator core, A busbar holder for holding the busbar, A housing that holds the stator core and the at least one busbar holder from the radial outside, Equipped with, The busbar holder is located radially outward with respect to one end of the coil, The busbar has a connecting portion extending from the busbar holder, The aforementioned connection portion is connected to the one end of the coil from the radially outer side, The housing has a recess that accommodates at least a portion of the busbar holder, The busbar holder is in contact with the housing from the radially inner side within the recess of the motor.

2. The motor according to claim 1, wherein the busbar holder is in contact with the housing from at least one side in the axial direction within the recess.

3. The motor according to claim 1, wherein the busbar holder is in contact with the housing from at least one side in the circumferential direction within the recess.

4. The motor according to claim 3, wherein the housing holds the stator core and the busbar holder by crimp-fit.

5. The bus bar has an extended portion that extends along the circumferential direction, The motor according to claim 1, wherein the at least one busbar holder holds the extended portion of the busbar and includes a plurality of busbar holders held radially from the outside by the housing.

6. A cylindrical stator core, A coil arranged in the stator core, A busbar connected to one end of the coil protruding from the end face of the stator core, A busbar holder for holding the busbar, A housing that holds the stator core and the at least one busbar holder from the radial outside, Equipped with, The busbar holder is located radially outward with respect to one end of the coil, The busbar has a connecting portion extending from the busbar holder, The aforementioned connection portion is connected to the one end of the coil from the radially outer side, The bus bar has an extended portion that extends along the circumferential direction, A motor in which the at least one busbar holder holds the extended portion of the busbar and includes a plurality of busbar holders held radially outward by the housing.

7. The motor according to claim 5 or 6, wherein the plurality of busbar holders are arranged at equal intervals in the circumferential direction.

8. The motor according to any one of claims 1 to 6, wherein the busbar is a busbar that electrically connects the external connection terminal of the motor to one end of the coil.

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

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

11. The motor is a three-phase motor, The motor according to any one of claims 1 to 6, wherein the busbar is a neutral point busbar that electrically connects one end of the coil to one end of the other coil to form a neutral point.

12. The motor according to any one of claims 1 to 6, wherein the busbar holder holds a plurality of busbars, including the busbar.

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