Motor

Abstract

This motor is provided with: a coil wound around a stator; a bus bar disposed so as to face the coil and connected to the coil; a temperature sensor disposed between the coil and the bus bar and in contact with the coil; and a spring disposed between the bus bar and the temperature sensor and pressing the temperature sensor against the coil.

Description

Technical Field

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

[0002] For a motor, when the output is large, the coils of the stator heat up. To measure the temperature of the stator or the coils, a temperature sensor is installed on the stator or the coils of the motor. Examples of motors with temperature sensors installed on the stator or the coils are disclosed in Japanese Unexamined Patent Application Publication No. 2017-99177, U.S. Patent Publication No. 2021 / 0278284, Japanese Unexamined Patent Application Publication No. 2023-89815, and International Publication No. 2011 / 117985. In the motor of Japanese Unexamined Patent Application Publication No. 2017-99177, a temperature sensor is installed on a wire extending from the coil. In the motor of U.S. Patent Publication No. 2021 / 0278284, a temperature sensor is installed on the coil. In the motor of Japanese Unexamined Patent Application Publication No. 2023-89815, a temperature sensor is installed on a bus bar connected to the coil. The temperature sensor is disposed between the bus bar and an outer cover (an outer cover covering the end of the housing of the motor). A biasing member is disposed between the temperature sensor and the outer cover. The biasing member presses the temperature sensor against the bus bar. In the motor of International Publication No. 2011 / 117985, a temperature sensor is installed on the coil. The temperature sensor is disposed between the inner surface of the housing of the motor and the coil, and an elastic member is disposed between the temperature sensor and the inner surface of the housing. The elastic member presses the temperature sensor against the coil. By pressing the temperature sensor against the coil with the elastic member, the temperature sensor is in close contact with the coil, so that the temperature of the coil can be accurately measured. Summary of the Invention

[0003] This specification provides a structure that simplifies the installation process of the spring that presses the temperature sensor against the coil.

[0004] The motor disclosed in this specification includes: a coil wound around a stator; a bus bar connected to the coil; a temperature sensor in contact with the coil; and a spring that presses the temperature sensor against the coil. The bus bar is configured to face the coil. The temperature sensor is disposed between the coil and the bus bar. In addition, "in contact with the coil" means in thermal contact with the coil. That is, a thermally conductive adhesive layer may be interposed between the coil and the temperature sensor. The spring is disposed between the bus bar and the temperature sensor. According to this structure, the bus bar and the spring can be installed on the coil at the same time. That is, according to this structure, the installation process of the spring that presses the temperature sensor against the coil can be simplified. In addition, if the spring is fixed to the bus bar, the spring can be moved together with the bus bar. The spring can also be installed by an automated device that operates on the bus bar to fix it to the stator.

[0005] The details and further improvements of the technology disclosed in this specification are described in the following "Detailed Description".

[0006] The features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 is a schematic configuration diagram of a motor according to the first embodiment.

[0008] Figure 2 is a view of the dashed-line range II as viewed from the direction of arrow A Figure 1 thereof.

[0009] Figure 3 is a view of the periphery of a temperature sensor of a motor according to the second embodiment. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] First Embodiment

[0011] In Figure 1 is shown a schematic cross-sectional view of a motor 2 according to the first embodiment. Figure 1 It is a cross-sectional view, but illustration of the hatching indicating the cross-section is omitted. The motor 2 includes a stator 3, a rotor 4, and a housing 5 that houses them. The stator 3 is fixed to the inner surface of the housing 5. The structure of the portion where the stator 3 is fixed is omitted from the illustration. The rotor 4 is supported by the housing 5 via bearings.

[0012] A coil 10 is wound around the stator 3. In Figure 1 and Figure 2 , illustration of each individual winding of the coil 10 is omitted, and only the outer shape of the coil 10 is shown. A temperature sensor 20 is attached to the end of the coil 10. Figure 2 is a view of the dashed-line range II as viewed from the direction of arrow A Figure 1 thereof. The mounting structure of the temperature sensor 20 will be described with reference to Figure 2 . In addition, illustration of the signal line of the temperature sensor 20 is omitted.

[0013] The temperature sensor 20 is provided to measure the temperature of the coil 10. The temperature sensor 20 is, for example, a thermistor or the like. The temperature sensor 20 is attached to the coil 10 via an adhesive resin 21. The adhesive resin is, for example, varnish, an adhesive sheet, or the like. In addition, the temperature sensor 20 may be directly attached to the coil 10 without passing through the adhesive resin.

[0014] On the other hand, a bus bar unit 30 is located above the temperature sensor 20. The bus bar unit 30 includes a relay bus bar 31 that connects the coil 10 to an external bus bar 40, and a resin block 32 that supports the relay bus bar 31. A part of the relay bus bar 31 is buried in the resin block 32. In Figure 2In [description], the resin block 32 and the bolts fixing the resin block 32 are depicted by phantom lines. In Figure 1 In [description], the resin block 32 is shown by phantom lines, and the illustration of the bolts is omitted. The bus bar unit 30 is fixed to the stator 3 by bolts. The first end of the relay bus bar 31 is connected to the lead wire 12 of the coil 10, and the second end of the relay bus bar 31 is connected to the external bus bar 40. The relay bus bar 31 is connected to the lead wire 12 by welding. The relay bus bar 31 can also be connected to the lead wire 12 by bolts.

[0015] The relay bus bar 31 extends to the outside of the housing 5 through the hole 6 provided in the housing 5. One end of the relay bus bar 31 reaches the terminal block 41 provided on the outer periphery of the housing 5. At the terminal block 41, the relay bus bar 31 and the external bus bar 40 are jointly fastened by bolts 42. The external bus bar 40 is connected to the AC output terminal of an inverter (not shown). Electric power is supplied from the inverter (not shown) to the coil 10 through the external bus bar 40 and the relay bus bar 31.

[0016] As described above, a part of the relay bus bar 31 is buried in the resin block 32, and the resin block 32 is fixed to the stator 3. A part of the relay bus bar 31 is positioned so as to face the coil 10. The temperature sensor 20 is located between the coil 10 and the relay bus bar 31. The first end of the spring 35 is buried in the resin block 32, and the second end of the spring 35 contacts the temperature sensor 20. The spring 35 is located between the temperature sensor 20 and the relay bus bar 31, and the spring 35 presses the temperature sensor 20 against the coil 10.

[0017] The reaction force of the spring 35 formed by pressing the temperature sensor 20 is borne by the relay bus bar 31. By the relay bus bar 31 bearing the reaction force of the spring 35, the temperature sensor 20 is in close contact with the coil 10. In addition, by fixing the spring 35 to the bus bar unit 30, the spring 35 is also installed when the bus bar unit 30 is installed on the stator 3. The installation process of the spring 35 is simplified. More precisely, the spring 35 is fixed to the resin block 32 of the bus bar unit 30.

[0018] Second Embodiment

[0019] While referring Figure 3 while explaining the motor 102 of the second embodiment. Figure 3 Similar to Figure 2 is a view of the motor 102 observed from the direction of arrow A of Figure 1 . The motor 102 is a three-phase AC electric motor, and a plurality of coils 10u, 10v are wound around the stator 3. In Figure 3In the figure, the illustration of each winding of the coil is also omitted, and only the outer shape of the coil is depicted. Coil 10u is a U-phase coil, and coil 10v is a V-phase coil. Although not depicted in Figure 3 it, the stator 3 also has a W-phase coil. As is well known, one end of the three coils is connected to each other at the neutral point. In Figure 3 the figure, the illustration of the housing is omitted.

[0020] In the motor 102, the neutral point bus bar 131 connects the coil 10u and the coil 10v. More specifically, the first end of the neutral point bus bar 131 is connected to the lead wire 12u of the coil 10u, and the second end is connected to the lead wire 12v of the coil 10v. The neutral point bus bar 131 is in a U shape, and the bottom of the U shape faces the coil 10u. A temperature sensor 20 is installed on the coil 10u. The temperature sensor 20 is fixed to the coil 10u by an adhesive resin 21. The temperature sensor 20 is located between the bottom of the U shape of the neutral point bus bar 131 and the coil 10u. A spring 35 is disposed between the neutral point bus bar 131 and the temperature sensor 20. The spring 35 is fixed to the neutral point bus bar 131 by an adhesive resin 133, and the spring 35 presses the temperature sensor 20 against the coil 10u. The neutral point bus bar 131 and the adhesive resin 133 are collectively referred to as the bus bar unit 130. The spring 35 is fixed to the neutral point bus bar 131 (bus bar unit 130).

[0021] The neutral point bus bar 131 bears the reaction force of the spring 35 formed by pressing the temperature sensor 20. By the neutral point bus bar 131 bearing the reaction force of the spring 35, the temperature sensor 20 is in close contact with the coil 10u. In addition, since the spring 35 is fixed to the neutral point bus bar 131 (bus bar unit 130), when the neutral point bus bar 131 is installed on the coil 10u (stator 3), the spring 35 is also installed at the same time. The installation process of the spring 35 is simplified.

[0022] The neutral point bus bar 131 is connected to the lead wires 12u and 12v by welding. The neutral point bus bar 131 can also be connected to the lead wires 12u and 12v by bolts. In addition, the neutral point bus bar 131 can also be supported by the stator 3.

[0023] As described above, the spring 35 that presses the temperature sensor 20 against the coil is fixed to the bus bar 31 (131). With this configuration, the spring 35 can be installed at the same time during the installation process of the bus bar 31 (131). In other words, the installation process of the spring 35 is simplified.

[0024] Enumerate the features of the motor 2 (102) in the embodiments. The motor 2 (102) includes: a coil 10 (10u) wound around a stator; busbars (relay busbar 31, neutral point busbar 131) connected to the coil 10 (10u); a temperature sensor 20 in contact with the coil 10 (10u); and a spring 35. The busbars (relay busbar 31, neutral point busbar 131) are arranged to face the coil 10 (10u). The temperature sensor 20 is arranged between the coil 10 (10u) and the busbars (relay busbar 31, neutral point busbar 131). The spring 35 is arranged between the busbars (relay busbar 31, neutral point busbar 131) and the temperature sensor 20, and presses the temperature sensor 20 against the coil 10 (10u).

[0025] In the motor 102, the coil includes a first coil (coil 10u) and a second coil (coil 10v). The first end of the neutral point busbar 131 is connected to the first coil (coil 10u), and the second end is connected to the second coil (coil 10v). The lead wire 12u of the first coil and the lead wire 12v of the second coil are positioned with the temperature sensor 20 therebetween. The neutral point busbar 131 connecting the lead wires 12u and 12v is in a U shape, and the bottom of the U is opposed to the temperature sensor 20.

[0026] The spring 35 is fixed to the busbars (relay busbar 31, neutral point busbar 131). More specifically, a part of the relay busbar 31 is buried in the resin block 32, and a part of the spring 35 is buried in the resin block 32. In other words, the spring 35 is fixed to the busbar unit 30 (130). If the spring 35 is fixed to the busbar unit 30 (130), the spring 35 is also fixed to a specified position in the process of operating and fixing the busbar unit 30 (130) to the stator 3.

[0027] Describe the points to note regarding the technology described in the embodiments. The temperature sensor 20 is mounted on the outer surface of the coil 10 (10u) in the radial direction of the motor 2 (102). The temperature sensor 20 may also be mounted on the end face of the coil 10 (10u) in the axial direction of the motor. The place where the temperature sensor 20 is mounted may also be any part of the coil. For example, the temperature sensor may also be mounted across the first coil and the second coil. At this time, an adhesive resin may also be filled between the first coil and the second coil to fill the gap between the two coils.

[0028] The first end of the busbars (relay busbar 31, neutral point busbar 131) is connected to the lead wire 12 (12u) of the coil 10 (10u). The second end of the busbar (relay busbar 31) may be connected to another busbar (external busbar 40), or may be connected to the lead wire 12v of another coil 10v.

[0029] The motor 102 of the second embodiment may also have a configuration in which the neutral point bus bar 131 is supported by a resin block and the resin block is fixed to the stator.

[0030] As described above, specific examples of the present invention have been described in detail. However, these are merely examples and do not limit the claims. The technology described in the claims includes technologies obtained by various modifications and changes to the above-described specific examples. The technical elements described in this specification or the drawings exhibit technical utility individually or in various combinations, and are not limited to the combinations recited in the claims at the time of application. In addition, the technologies illustrated in this specification or the drawings can achieve multiple objects simultaneously, and achieving one of the objects itself has technical utility.

Claims

1. A motor, characterized in that: The motor has: Coil, wound around the stator; a bus bar, arranged to be opposite to the coil and connected to the coil; a temperature sensor, disposed between the coil and the bus bar and in contact with the coil; as well as The spring is disposed between the bus bar and the temperature sensor and presses the temperature sensor against the coil.

2. The motor according to claim 1, characterized in that The coil includes a first coil and a second coil, The first end of the bus bar is connected to the first coil, and the second end of the bus bar is connected to the second coil.

3. The motor according to claim 2, characterized in that The lead wire of the first coil and the lead wire of the second coil are positioned with the temperature sensor interposed therebetween.

4. The motor according to any one of claims 1 to 3, characterized in that: The spring is fixed to the bus bar.

5. The motor according to claim 1, characterized in that A resin block fixed to the stator is further provided, and a part of the bus bar and the first end of the spring are buried in the resin block.

6. The motor according to claim 5, characterized in that The second end of the spring is in contact with the temperature sensor.

7. The motor according to claim 2, characterized in that The first end of the spring is fixed to the bus bar.

8. The motor according to claim 7, characterized in that The second end of the spring contacts the temperature sensor.

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