Busbar structure, and motor stator assembly and motor comprising busbar structure

Abstract

The present invention relates to a busbar structure (100) for a motor stator assembly (1000), a motor stator assembly (1000) comprising the busbar structure, and a motor comprising the motor stator assembly. The busbar structure (100) comprises a busbar (1) and a temperature sensor (2) for detecting a temperature of the busbar (1), wherein a part of the busbar (1) is directly attached to a temperature measuring portion (21) of the temperature sensor (2), the busbar structure (100) further comprises an injection-molded member (3), the injection-molded member (3) is integrally formed with the busbar (1) and the temperature sensor (2) by means of injection molding, and covers the part of the busbar (1) and at least part of the temperature measuring portion (21) of the temperature sensor (2) to fix the temperature measuring portion (21) to the busbar (1). The present invention makes it possible to improve the temperature measurement accuracy, simplify the process flow, reduce the production costs, and allow the sensor to be firmly fixed.

Description

[0001] BUSBAR STRUCTURE, AND MOTOR STATOR ASSEMBLY AND MOTOR COMPRISING BUSBAR STRUCTURE

[0002] Technical Field

[0003] The present invention relates to the technical field of motors, and in particular to a busbar structure for a motor stator assembly, a motor stator assembly comprising the busbar structure, and a motor comprising the motor stator assembly.

[0004] Background Art

[0005] A motor generates a lot of heat during operation, especially in a stator winding. If the temperature is too high, it will cause the insulation of the stator winding to age and deteriorate, thereby reducing the efficiency and life of the motor. Therefore, a temperature sensor is usually arranged to detect the temperature change in the stator winding in real time and transmit the signal to a controller for processing, so as to perform current limiting or derating in a timely manner to avoid motor burnout.

[0006] In the prior art, the temperature sensor is usually fixed to a busbar of a stator assembly, and the busbar is connected to the stator winding, so that the temperature of the stator winding can be detected by using the temperature sensor. Currently, there are the following several methods for fixing the temperature sensor to the busbar:

[0007] 1 . A temperature measuring portion of the temperature sensor is directly tied or clamped to the busbar. This method has a small temperature measurement error. However, the labor cost is high, the sensor is easy to loosen, and the temperature measuring portion of the sensor is easily wetted by a coolant.

[0008] 2. The temperature measuring portion of the temperature sensor is welded to the busbar. This method has a small temperature measurement error and the sensor is firmly fixed. However, the process is complex, the labor cost is high, and the temperature measuring portion of the sensor is easily wetted by the coolant.

[0009] 3. The temperature measuring portion of the temperature sensor is covered with a plastic shell and clamped to the busbar by a clip. The temperature measuring portion of the sensor in this method is not easily wetted by the coolant. However, the temperature measurement error is large, the labor cost is high, the material cost is high, and the sensor is easy to loosen.

[0010] Therefore, there is a need to improve the fixing method of the temperature sensor.

[0011] Summary of the Invention

[0012] The present invention aims to solve at least one aspect of the above problems and defects existing in the prior art.

[0013] To this end, the present invention proposes a busbar structure for a motor stator assembly, comprising a busbar and a temperature sensor for detecting a temperature of the busbar, wherein a part of the busbar is directly attached to a temperature measuring portion of the temperature sensor, the busbar structure further comprises an injection-molded member, the injection-molded member is integrally formed with the busbar and the temperature sensor by means of injection molding, and covers the part of the busbar and at least part of the temperature measuring portion of the temperature sensor to fix the temperature measuring portion to the busbar.

[0014] On the one hand, since the temperature sensor is fixed to the busbar by means of injection molding, the stator assembling process can be simplified, the labor cost and material cost can be reduced, and the sensor can be firmly fixed. On the other hand, since the temperature measuring portion of the temperature sensor is in direct contact with the busbar, the temperature measurement error can be reduced and the temperature measurement accuracy can be improved. In addition, since the temperature measuring portion of the temperature sensor is covered in the injection-molded member, the temperature measuring portion can be prevented from being wetted by the coolant and reducing the temperature measurement accuracy.

[0015] In a preferred embodiment, the temperature sensor has an anti-detachment structure for preventing the temperature measuring portion from being detached from the busbar. In a preferred embodiment, the anti-detachment structure is a protrusion provided on the temperature measuring portion, and the protrusion is inserted into an opening or recessed portion of a sensor fixing end of the busbar. On the one hand, this can fix the temperature sensor and the busbar more firmly to prevent the temperature sensor from being detached from the busbar; on the other hand, this can position the temperature sensor and the busbar during the injection molding process to solve the problem of difficult and inaccurate positioning between the temperature sensor and the busbar.

[0016] In a preferred embodiment, the anti-detachment structure is a protrusion provided on the temperature measuring portion, and the protrusion is embedded in the injection-molded member. This may fix the temperature sensor and the busbar more firmly in a simple manner to prevent the temperature sensor from being detached from the busbar.

[0017] In a preferred embodiment, the anti-detachment structure comprises a first protrusion and a second protrusion provided on the temperature measuring portion, wherein the first protrusion is inserted into an opening or recessed portion of a sensor fixing end of the busbar, and the second protrusion is embedded in the injection-molded member. This allows the fixing firmness between the temperature sensor and the busbar to be further improved.

[0018] In a preferred embodiment, the temperature measuring portion comprises a first part farther from a cable of the temperature sensor and a second part closer to the cable, wherein the first part has a greater width than the second part, and the first part is covered by the injection-molded member to form the anti-detachment structure. This prevents the temperature sensor from being detached from the busbar while also allowing the temperature measurement accuracy to be improved and avoiding affecting the electrical properties of the busbar.

[0019] In a preferred embodiment, the busbar comprises a first-phase busbar, a second-phase busbar, a third-phase busbar and a neutral busbar, and the temperature measuring portion of the temperature sensor is directly attached to the 2024P00105WQ

[0020] 4 first-phase busbar, the second-phase busbar, the third-phase busbar or the neutral busbar.

[0021] In a preferred embodiment, the neutral busbar comprises a main body portion, a connecting end and a sensor fixing end, wherein the connecting end is connected to the main body portion, the sensor fixing end is connected to the main body portion or the connecting end, and the temperature measuring portion of the temperature sensor is directly attached to the sensor fixing end.

[0022] In a preferred embodiment, the sensor fixing end is connected to the main body portion in a direction perpendicular to a plane where the main body portion is located or in a direction where the main body portion extends, or the sensor fixing end is connected to the connecting end in a direction perpendicular to a plane where the connecting end is located. This provides multiple spatial possibilities for the installation of the temperature sensor.

[0023] The present invention further proposes a motor stator assembly, comprising a stator core and a stator winding inserted in tooth slots of the stator core, wherein the motor stator assembly further comprises the busbar structure described above, and the busbar of the busbar structure is electrically connected to a lead-out wire of the stator winding.

[0024] The present invention further proposes a motor, wherein the motor comprises the motor stator assembly described above.

[0025] Brief Description of the Drawings

[0026] The present invention will be described in detail below by way of non-limiting embodiments with reference to the accompanying drawings, in which:

[0027] Fig. 1 is a perspective view of a motor stator assembly according to a first embodiment of the present invention;

[0028] Fig. 2 is a perspective view of a busbar structure for a motor stator assembly according to the first embodiment of the present invention; Fig. 3 is the busbar structure shown in Fig. 2, but with an injection-molded member removed to clearly show the fixing relationship between a temperature sensor and a busbar;

[0029] Fig. 4 is another perspective view of the busbar structure shown in Fig. 2;

[0030] Fig. 5 is an enlarged view of portion A in Fig. 4;

[0031] Fig. 6 is a perspective view of a neutral busbar of the busbar structure shown in Fig. 2;

[0032] Fig. 7 is a perspective view of a temperature sensor of the busbar structure shown in Fig. 2;

[0033] Fig. 8 is a perspective view of a motor stator assembly according to a second embodiment of the present invention;

[0034] Fig. 9 is a perspective view of a busbar structure for a motor stator assembly according to the second embodiment of the present invention;

[0035] Fig. 10 is the busbar structure shown in Fig. 9, but with an injection-molded member removed to clearly show the fixing relationship between a temperature sensor and a busbar;

[0036] Fig. 11 is another perspective view of the busbar structure shown in Fig. 9;

[0037] Fig. 12 is an enlarged view of portion A in Fig. 11 ;

[0038] Fig. 13 is a perspective view of a neutral busbar of the busbar structure shown in Fig. 9;

[0039] Fig. 14 is a perspective view of a temperature sensor of the busbar structure shown in Fig. 9;

[0040] Fig. 15 is a perspective view of a busbar structure for a motor stator assembly according to a third embodiment of the present invention;

[0041] Fig. 16 is an enlarged view of portion A in Fig. 15;

[0042] Fig. 17 is a perspective view of a part of a neutral busbar of the busbar structure shown in Fig. 15;

[0043] Fig. 18 is a perspective view of a busbar structure for a motor stator assembly according to a fourth embodiment of the present invention;

[0044] Fig. 19 is an enlarged view of portion A in Fig. 18;

[0045] Fig. 20 is a perspective view of a part of a neutral busbar in Fig. 19;

[0046] Fig. 21 is a perspective view of a part of a temperature sensor in Fig. 19;

[0047] Fig. 22 is an enlarged view of portion A in Fig. 18 from another viewpoint; Fig. 23 is a perspective view of a part of a neutral busbar of a busbar structure for a motor stator assembly according to a fifth embodiment of the present invention;

[0048] Fig. 24 is a perspective view of a part of a temperature sensor of the busbar structure for the motor stator assembly according to the fifth embodiment of the present invention;

[0049] Fig. 25 is a perspective view of a motor stator assembly according to a sixth embodiment of the present invention;

[0050] Fig. 26 is a perspective view of a busbar structure for a motor stator assembly according to the sixth embodiment of the present invention;

[0051] Fig. 27 is the busbar structure shown in Fig. 26, but with an injection-molded member removed to clearly show the fixing relationship between a temperature sensor and a busbar;

[0052] Fig. 28 is another perspective view of the busbar structure shown in Fig. 26;

[0053] Fig. 29 is an enlarged view of portion A in Fig. 28;

[0054] Fig. 30 is a perspective view of a neutral busbar of the busbar structure shown in

[0055] Fig. 26; and

[0056] Fig. 31 is a perspective view of a temperature sensor of the busbar structure shown in Fig. 26.

[0057] These drawings are only schematic and not necessarily drawn to scale, and only show these parts necessary to illustrate the present invention, while other parts may be omitted or only briefly mentioned. That is, in addition to components shown in the drawings, the present invention may include other components. In addition, in the drawings, the same and / or functionally identical technical features are denoted with the same reference numerals.

[0058] Detailed Description of the Invention

[0059] In the following description, many specific details are set forth so that those skilled in the art can more fully understand the present invention. However, it is obvious to those skilled in the art that the present invention may be implemented without some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the following features and elements may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following features, embodiments and advantages are intended for illustration only and should not be considered as elements or limitations of the claims unless expressly specified in the claims.

[0060] The descriptions about orientations used in the following description, such as "upper," "lower," "inner," "outer," "radial," "axial", etc., are only for the convenience of description, and are not intended to form any limitation on the present invention, unless expressly stated. In addition, the terms "first," "second" and "third" are used herein to describe components or parts, and these terms are only used to distinguish between various components or parts, and are not used to limit the order or number of these components or parts.

[0061] Fig. 1 shows a motor stator assembly 1000 according to a first embodiment of the present invention. The motor stator assembly 1000 includes a busbar structure 100, a stator core 200 and a stator winding 300. The stator core 200 is cylindrical, and tooth slots are arranged on its inner circumference. The stator winding 300 is inserted into the tooth slots of the stator core 200 and extends from both ends of the stator core 200, and the stator winding 300 has a lead-out wire 30 at one end (the upper end in Fig. 1 ). The busbar structure 100 includes a busbar 1 , and the busbar 1 includes a first-phase busbar 11 , a second-phase busbar 12, a third-phase busbar 13 and a neutral busbar 10 (see Fig. 3). The first-phase busbar 11 , the second-phase busbar 12 and the third-phase busbar 13 each have an input end (the upper end in Fig. 1 ) and a plurality of output ends 112, 122, 132 (see Figs. 2 and 3), wherein the input end is connected to an external power supply line via corresponding outgoing copper bars 111 , 121 , 131 , and the output ends are connected to the lead-out wire 30 of the stator winding 300; the neutral busbar 10 includes a plurality of connecting ends 102 (see Fig. 6), and the connecting ends 102 are connected to the lead-out wire 30 of the stator winding 300; thereby, a current is introduced into the stator winding 300, so that the motor runs.

[0062] With the emergence of high-power motors, the heat generation problem of stator windings has become more prominent. Therefore, it is desired that the temperature of the stator windings is detected in real time so as to perform current limiting or derating in a timely manner to avoid motor burnout. To this end, it is necessary to arrange a temperature sensor to detect the temperature of the stator windings. The fixing method of the temperature sensor in the prior art is not ideal, which leads to problems such as large temperature measurement error, high production cost or easy loosening of the sensor.

[0063] The present invention proposes a busbar structure integrated with a temperature sensor to solve some or all of these problems. Figs. 2 to 7 show a busbar structure 100 and its components according to the first embodiment of the present invention. Fig. 2 is a perspective view of the busbar structure 100 according to the first embodiment of the present invention; Fig. 3 shows the busbar structure 100 shown in Fig. 2, with an injection-molded member 3 removed to more clearly show the fixing relationship between a temperature sensor 2 and a busbar 1 ; Fig. 4 is another perspective view of the busbar structure 100 shown in Fig. 2, showing a specific fixing method between the temperature sensor 2 and the busbar 1 in a partial cross-sectional view; Fig. 5 is an enlarged view of portion A in Fig. 4, so as to more clearly show the specific fixing method between the temperature sensor 2 and the busbar 1 ; Fig. 6 is a perspective view of a neutral busbar 10 of the busbar structure 100 shown in Fig. 2; and Fig. 7 is a perspective view of the temperature sensor 2 of the busbar structure 100 shown in Fig. 2.

[0064] As shown in Fig. 2, the busbar structure 100 includes a busbar 1 , a temperature sensor 2 directly attached to one part of the busbar 1 , and an injection-molded member 3 integrally formed with the busbar 1 and the temperature sensor 2 by means of injection molding. Here, the temperature sensor 2 may be a negative temperature coefficient sensor, but is not limited thereto.

[0065] More specifically, as an exemplary embodiment, as shown in Figs. 2 to 5, the temperature sensor 2 is fixed to the neutral busbar 10. It should be understood that the temperature sensor 2 may also be fixed to the first-phase busbar 11 , the second-phase busbar 12 or the third-phase busbar 13.

[0066] As shown in Fig. 6, the neutral busbar 10 includes a main body portion 101 , and a connecting end 102 and a sensor fixing end 103 extending from the main body portion 101 . The connecting end 102 and the sensor fixing end 103 are connected to the main body portion 101 in a direction perpendicular to a plane where the main body portion 101 is located, for example extending from the main body portion 101 perpendicularly to the plane where the main body portion 101 is located. As shown in Fig. 7, the temperature sensor 2 includes a temperature measuring portion 21 , a cable 22 and an interface member 23. As shown in Figs. 3 to 5, the temperature measuring portion 21 of the temperature sensor 2 is directly attached to the sensor fixing end 103 of the neutral busbar 10. Thus, the temperature sensor 2 can detect the temperature of the neutral busbar 10 through the temperature measuring portion 21 and thereby detect the temperature of the stator winding 300, and transmit it to a controller for processing via the cable 22 and the interface member 23, so as to perform current limiting or derating in a timely manner to avoid motor burnout.

[0067] As shown in Figs. 2 and 4, the injection-molded member 3 is integrally formed with the first-phase busbar 11 , the second-phase busbar 12, the third-phase busbar 13, the neutral busbar 10 and the temperature sensor 2 by means of injection molding, and the injection-molded member 3 covers the temperature measuring portion 21 and the sensor fixing end 103, thereby fixing them together. As such, on the one hand, since the temperature sensor 2 is fixed to the neutral busbar 10 by means of injection molding, without additional clamping or fastening structure, the process flow can be simplified, the production costs can be reduced, and the sensor can be firmly fixed. On the other hand, since the temperature measuring portion 21 of the temperature sensor 2 is in direct contact with the neutral busbar 10, the temperature measurement error can be reduced and the temperature measurement accuracy can be improved. In addition, since the temperature measuring portion 21 of the temperature sensor 2 is covered in the injection-molded member 3, the temperature measuring portion 21 can be prevented from being wetted by a coolant and reducing the temperature measurement accuracy.

[0068] In order to further prevent the temperature sensor 2 from being detached from the neutral busbar 10, namely, from being removed from the injection-molded member 3, as shown in Fig. 5, a protrusion 24 is provided on the temperature measuring portion 21 of the temperature sensor 2, and the protrusion 24 is embedded in the injection-molded member 3. Specifically, the temperature measuring portion 21 includes a flat attachment surface, and is attached to the corresponding surface of the sensor fixing end 103 of the neutral busbar 10 through the attachment surface, and the protrusion 24 is provided on one or more surfaces of the temperature measuring portion 21 except the attachment surface, as shown in Figs. 5 and 7.

[0069] When manufacturing the busbar structure 100, the first-phase busbar 11 , the second-phase busbar 12, the third-phase busbar 13, the neutral busbar 10 and the temperature sensor 2 are first positioned in a mold, and then molten plastic is injected into the mold. After the plastic is solidified to form the injection-molded member 3, the first-phase busbar 11 , the second-phase busbar 12, the third-phase busbar 13, the neutral busbar 10 and the temperature sensor 2 are integrally fixed.

[0070] Fig. 8 shows a motor stator assembly 1000 according to a second embodiment of the present invention, and Figs. 9 to 14 show a busbar structure 100 and its components according to the second embodiment of the present invention. The second embodiment is different from the first embodiment only in the position where the temperature sensor 2 and the neutral busbar 10 are fixed to each other. These differences will be described in detail below, and other parts will not be repeated.

[0071] In the second embodiment, as shown in Fig. 13, the sensor fixing end 103 of the neutral busbar 10 is connected to the main body portion 101 in a direction in which the main body portion 101 extends, for example extending from the main body portion 101 , and has an opening 104. As shown in Figs. 12 and 14, the protrusion 24 on the temperature measuring portion 21 of the temperature sensor 2 is arranged on the attachment surface of the temperature measuring portion 21 attached to the neutral busbar 10, and the protrusion 24 is inserted into the opening 104 of the sensor fixing end 103 of the neutral busbar 10. The insertion of the protrusion 24 into the opening 104 can, on the one hand, make the temperature sensor 2 and the neutral busbar 10 more firmly fixed, preventing the temperature sensor 2 from being detached from the neutral busbar 10; and on the other hand, can position the temperature sensor 2 and the neutral busbar 10 during the injection molding process, solving the problem of difficult and inaccurate positioning between the temperature sensor 2 and the neutral busbar 10. As specifically shown in Fig. 12, the thickness of the protrusion 24 is less than the thickness of the sensor fixing end 103, which allows a part of the plastic of the injection-molded member 3 to be embedded in the opening 104, thereby further improving the fixing firmness between the temperature sensor 2 and the neutral busbar 10. Obviously, the thickness of the protrusion 24 may also be greater than the thickness of the sensor fixing end 103, that is, the protrusion 24 may extend from the opening 104 and be embedded in the injection-molded member 3, which may also further improve the fixing firmness between the temperature sensor 2 and the neutral busbar 10.

[0072] Figs. 15 to 17 show a busbar structure 100 and its components according to a third embodiment of the present invention. Fig. 15 is a perspective view of the busbar structure 100 according to the third embodiment of the present invention, in which the injection-molded member 3 is removed and the fixing relationship between the temperature sensor 2 and the busbar 1 is shown in a partial cross-sectional view; Fig. 16 is an enlarged view of portion A in Fig. 15 to more clearly show a specific fixing method between the temperature sensor 2 and the busbar 1 ; and Fig. 17 is a perspective view of a part of the neutral busbar 10 of the busbar structure 100 shown in Fig. 15. The third embodiment is different from the second embodiment only in the position where the temperature sensor 2 and the neutral busbar 10 are fixed to each other. These differences will be described in detail below, and other parts will not be repeated.

[0073] As shown in Fig. 17, the sensor fixing end 103 of the neutral busbar 10 has a recessed portion 105 on the surface that is attached to the temperature sensor 2, instead of the opening 104 described in the second embodiment. The recessed portion 105 has a bottom surface 1051. As shown in Figs. 15 and 16, the protrusion 24 on the temperature measuring portion 21 of the temperature sensor 2 is inserted into the recessed portion 105 of the sensor fixing end 103 of the neutral busbar 10. The size of the protrusion 24 and the size of the recessed portion 105 are appropriately designed so that when the protrusion 24 is inserted into the recessed portion 105, the attachment surface of the temperature measuring portion 21 can be attached to the sensor fixing end 103 of the neutral busbar 10 while the protrusion 24 is also attached to the bottom surface 1051 of the recessed portion 105. As such, the protrusion 24 and the recessed portion 105 cooperate with each other, which can not only firmly fix the temperature sensor 2 and the neutral busbar 10 and easily position the two as described in the second embodiment, but also increase the attachment area between the temperature sensor 2 and the neutral busbar 10, thereby improving the temperature measurement accuracy.

[0074] Figs. 18 to 22 show a busbar structure 100 and its components according to a fourth embodiment of the present invention. Fig. 18 is a perspective view of the busbar structure 100 according to the fourth embodiment of the present invention, in which the injection-molded member 3 is removed to show the fixing relationship between the temperature sensor 2 and the busbar 1 ; Fig. 19 is an enlarged view of portion A in Fig. 18; Fig. 20 is a perspective view of a part of the neutral busbar 10 of the busbar structure 100 shown in Fig. 18; Fig. 21 is a perspective view of a part of the temperature sensor 2 of the busbar structure 100 shown in Fig. 18; and Fig. 22 is an enlarged view of portion A in Fig. 18 from another viewpoint, showing a specific fixing method between the temperature sensor 2 and the busbar 1 in a partial cross-sectional view. The fourth embodiment is different from the second embodiment only in the position where the temperature sensor 2 and the neutral busbar 10 are fixed to each other. These differences will be described in detail below, and other parts will not be repeated.

[0075] In the fourth embodiment, as shown in Fig. 20, the sensor fixing end 103 of the neutral busbar 10 is connected to the main body portion 101 in a direction in which the main body portion 101 extends, for example extending from the main body portion 101 , and the sensor fixing end 103 does not have an opening 104 or a recessed portion 105. As shown in Fig. 21 , the temperature measuring portion 21 of the temperature sensor 2 includes a first part 211 farther from a cable 22 of the temperature sensor 2 and a second part 212 closer to the cable 22, and the first part 211 has a greater width than the second part 212. In the busbar structure 100 according to the fourth embodiment of the present invention, the first part 211 is covered by the injection-molded member 3 (not shown in the figures). Since the part covered by the injection-molded member 3 has a greater width than the part not covered, an anti-detachment structure may be formed to prevent the temperature sensor 2 from being detached from the neutral busbar 10. In this embodiment, the protrusion 24 is not provided on the attachment surface of the temperature measuring portion 21 of the temperature sensor 2, so that the opening 104 or the recessed portion 105 does not need to be provided on the sensor fixing end 103 of the neutral busbar 10, thereby avoiding the influence on the electrical performance of the neutral busbar 10. In addition, the attachment surface of the temperature measuring portion 21 may be completely attached to the sensor fixing end 103, as shown in Fig. 22, and the width of the first part 211 of the temperature measuring portion 21 may be designed to be substantially the same as the width of the sensor fixing end 103 or slightly smaller than the width of the sensor fixing end 103, as shown in Fig. 19, which can increase the attachment area between the temperature sensor 2 and the neutral busbar 10, thereby improving the temperature measurement accuracy.

[0076] Figs. 23 and 24 show components in a busbar structure 100 according to a fifth embodiment of the present invention. Fig. 23 is a perspective view of a part of a neutral busbar 10 of the busbar structure 100 for a motor stator assembly according to the fifth embodiment of the present invention; and Fig. 24 is a perspective view of a part of a temperature sensor 2 of the busbar structure 100 for the motor stator assembly according to the fifth embodiment of the present invention. The fifth embodiment is different from the fourth embodiment only in the position where the temperature sensor 2 and the neutral busbar 10 are fixed to each other. These differences will be described in detail below, and other parts will not be repeated.

[0077] In the fifth embodiment, as shown in Fig. 23, the sensor fixing end 103 of the neutral busbar 10 is connected to the main body portion 101 in a direction in which the main body portion 101 extends, for example extending from the main body portion 101 , and the sensor fixing end 103 has an opening 104 or a recessed portion 105. As shown in Fig. 24, the temperature measuring portion 21 of the temperature sensor 2 includes a first part 211 farther from a cable 22 of the temperature sensor 2 and a second part 212 closer to the cable 22, wherein the first part 211 has a greater width than the second part 212. Moreover, a protrusion 24 is provided on the attachment surface of the first part 211 attached to the neutral busbar 10, and the protrusion 24 is inserted into the opening 104 or the recessed portion 105 of the sensor fixing end 103 of the neutral busbar 10. As such, compared with the fourth embodiment, the temperature sensor 2 and the neutral busbar 10 in this embodiment can be more firmly fixed, and the temperature sensor 2 and the neutral busbar 10 can be more easily positioned.

[0078] Fig. 25 shows a motor stator assembly 1000 according to a sixth embodiment of the present invention, and Figs. 26 to 31 show a busbar structure 100 and its components according to the sixth embodiment of the present invention. The sixth embodiment is different from the first embodiment only in the position where the temperature sensor 2 and the neutral busbar 10 are fixed to each other. These differences will be described in detail below, and other parts will not be repeated.

[0079] In the sixth embodiment, as shown in Fig. 30, the sensor fixing end 103 of the neutral busbar 10 is connected to a connecting end 102 in a direction perpendicular to a plane where the connecting end 102 is located, for example extending from the connecting end 102 perpendicularly to the plane where the connecting end 102 is located, and has an opening 104. As shown in Figs. 29 and 31 , the protrusion 24 on the temperature measuring portion 21 of the temperature sensor 2 is arranged on the attachment surface of the temperature measuring portion 21 attached to the neutral busbar 10, and the protrusion 24 is inserted into the opening 104 of the sensor fixing end 103 of the neutral busbar 10. The insertion of the protrusion 24 into the opening 104 can, on the one hand, make the temperature sensor 2 and the neutral busbar 10 more firmly fixed, preventing the temperature sensor 2 from being detached from the neutral busbar 10; and on the other hand, can position the temperature sensor 2 and the neutral busbar 10 during the injection molding process, solving the problem of difficult and inaccurate positioning between the temperature sensor 2 and the neutral busbar 10.

[0080] As specifically shown in Fig. 29, as in the second embodiment, the thickness of the protrusion 24 is less than the thickness of the sensor fixing end 103, which allows a part of the plastic of the injection-molded member 3 to be embedded in the opening 104, thereby further improving the fixing firmness between the temperature sensor 2 and the neutral busbar 10. Obviously, the thickness of the protrusion 24 may also be greater than the thickness of the sensor fixing end 103, that is, the protrusion 24 may extend from the opening 104 and be embedded in the injection-molded member 3, which may also further improve the fixing firmness between the temperature sensor 2 and the neutral busbar 10.

[0081] In an embodiment not shown, the temperature measuring portion 21 of the temperature sensor 2 has a first protrusion and a second protrusion. The first protrusion is, for example, arranged on the attachment surface of the temperature measuring portion 21 and inserted into the opening 104 of the sensor fixing end 103 of the neutral busbar 10, and the second protrusion is, for example, arranged on the surface of the temperature measuring portion 21 other than the attachment surface and embedded in the injection-molded member 3, which allows the fixing firmness between the temperature sensor 2 and the neutral busbar 10 to be further improved.

[0082] In each of the above embodiments, the temperature sensor 2 is fixed to the neutral busbar 10. It should be understood that the temperature sensor 2 may also be fixed to the first-phase busbar 11 , the second-phase busbar 12 or the third-phase busbar 13. As described above, in the first embodiment, the sensor fixing end 103 extends from the main body portion 101 perpendicularly to the plane where the main body portion 101 is located, so that the temperature sensor 2 can be positioned parallel to an axial direction of the stator core 200 (as shown in Fig. 1 ). In the second, third, fourth and fifth embodiments, the sensor fixing end 103 extends from the main body portion 101 in the direction in which the main body portion 101 extends, so that the temperature sensor 2 can be positioned substantially along a tangential direction of the stator core 200 (as shown in Fig. 8). In the sixth embodiment, the sensor fixing end 103 extends from the connecting end 102 perpendicularly to the plane where the connecting end 102 is located, so that the temperature sensor 2 can be positioned substantially along a radial direction of the stator core 200 (as shown in Fig. 25). This provides multiple spatial possibilities for the installation of the temperature sensor 2. It should be understood that the temperature sensor 2 may also be positioned in any suitable direction. Although the present invention is disclosed as above with reference to the preferred embodiments, the present invention is not limited thereto. Any change or modification made by those skilled in the art without departing from the spirit and scope of the present invention should fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be subject to the scope defined by the claims.

Claims

Claims1 . A busbar structure (100) for a motor stator assembly (1000), the busbar structure (100) comprising a busbar (1 ) and a temperature sensor (2) for detecting a temperature of the busbar (1 ), characterized in that a part of the busbar (1 ) is directly attached to a temperature measuring portion (21 ) of the temperature sensor (2), the busbar structure (100) further comprises an injection-molded member (3), the injection-molded member (3) is integrally formed with the busbar (1 ) and the temperature sensor (2) by means of injection molding, and covers the part of the busbar (1 ) and at least part of the temperature measuring portion (21 ) of the temperature sensor (2) to fix the temperature measuring portion (21 ) to the busbar (1 ).

2. The busbar structure (100) as claimed in claim 1 , characterized in that the temperature sensor (2) has an anti-detachment structure for preventing the temperature measuring portion (21 ) from being detached from the busbar (1 ).

3. The busbar structure (100) as claimed in claim 2, characterized in that the anti-detachment structure is a protrusion (24) provided on the temperature measuring portion (21 ), and the protrusion (24) is inserted into an opening (104) or recessed portion (105) of a sensor fixing end (103) of the busbar (1 ).

4. The busbar structure (100) as claimed in claim 2, characterized in that the anti-detachment structure is a protrusion (24) provided on the temperature measuring portion (21 ), and the protrusion (24) is embedded in the injection-molded member (3).

5. The busbar structure (100) as claimed in claim 2, characterized in that the anti-detachment structure comprises a first protrusion and a second protrusion provided on the temperature measuring portion (21 ), wherein the first protrusion is inserted into an opening (104) or recessed portion (105) of a sensor fixing end (103) of the busbar (1 ), and the second protrusion is embedded in the injection-molded member (3).

6. The busbar structure (100) as claimed in claim 2, characterized in that the temperature measuring portion (21 ) comprises a first part (211 ) farther from a cable (22) of the temperature sensor (2) and a second part (212) closer to the cable (22), wherein the first part (211 ) has a greater width than the second part (212), and the first part (211 ) is covered by the injection-molded member (3) to form the anti-detachment structure.

7. The busbar structure (100) as claimed in any one of claims 1 to 6, characterized in that the busbar (1 ) comprises a first-phase busbar (11 ), a second-phase busbar (12), a third-phase busbar (13) and a neutral busbar (10), and the temperature measuring portion (21 ) of the temperature sensor (2) is directly attached to the first-phase busbar (11 ), the second-phase busbar (12), the third-phase busbar (13) or the neutral busbar (10).

8. The busbar structure (100) as claimed in claim 7, characterized in that the neutral busbar (10) comprises a main body portion (101 ), a connecting end (102) and a sensor fixing end (103), wherein the connecting end (102) is connected to the main body portion (101 ), the sensor fixing end (103) is connected to the main body portion (101 ) or the connecting end (102), and the temperature measuring portion (21 ) of the temperature sensor (2) is directly attached to the sensor fixing end (103).

9. The busbar structure (100) as claimed in claim 8, characterized in that the sensor fixing end (103) is connected to the main body portion (101 ) in a direction perpendicular to a plane where the main body portion (101 ) is located or in a direction where the main body portion (101 ) extends, or the sensor fixing end (103) is connected to the connecting end (102) in a direction perpendicular to a plane where the connecting end (102) is located.

10. A motor stator assembly (1000), the motor stator assembly (1000) comprising a stator core (200) and a stator winding (300) inserted in tooth slots of the stator core (200), characterized in that the motor stator assembly (1000) further comprises the busbar structure (100) as claimed in any one of claims 1 to 9, and the busbar (1 ) of the busbar structure (100) is electrically connected to a lead-out wire (30) of the stator winding (300).11 . A motor, characterized in that the motor comprises the motor stator assembly (1000) as claimed in claim 10.

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