Stator assembly, motor and electrical equipment

Abstract

The utility model discloses a stator assembly, a motor and electrical equipment. The stator assembly comprises a stator core, a stator winding and a heat conduction part. The stator core comprises a plurality of stator punching sheets, the plurality of stator punching sheets are sequentially stacked in the axis direction of the stator core, a plurality of stator tooth parts are arranged in the circumferential direction of each stator punching sheet, and a stator groove is formed between every two adjacent stator tooth parts; the stator winding comprises a plurality of coils, and the plurality of coils are wound on the plurality of stator tooth parts in a one-to-one correspondence manner; the heat conduction parts are arranged in the stator grooves, each heat conduction part is located between two adjacent coils, and the coils and the stator iron core are in contact with the heat conduction parts. According to the invention, the problem of uneven temperature distribution in the stator slots caused by heat accumulation of the windings in the stator slots in the prior art can be solved.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a stator assembly, a motor and an electrical device. Background Art

[0002] During the operation of the motor, the stator winding in the motor is the main source of heat. At present, the heat concentration point of the winding in the stator slot is mostly at the position farthest from the stator slot. Especially for the winding structure with concentrated winding arranged left and right, the temperature of the winding at the center line position in the stator slot is the highest. If the temperature of the winding cannot be quickly conducted away, it will cause heat accumulation between the windings in the stator slot, which not only increases the minimum insulation level allowed for the winding in the stator slot, but also affects the overall heat dissipation effect of the motor, thereby reducing the stability and reliability of the motor. Utility Model Content

[0003] The main purpose of the present application is to provide a stator assembly, a motor and an electrical device to solve the problem of heat accumulation in the windings in the stator slots in the prior art, which easily leads to uneven temperature distribution in the stator slots.

[0004] According to one aspect of the present application, there is provided a stator assembly, comprising:

[0005] A stator core, wherein the stator core comprises a plurality of stator punching sheets, wherein the plurality of stator punching sheets are stacked in sequence along the axial direction of the stator core, and each of the stator punching sheets is provided with a plurality of stator teeth in the circumferential direction, and a stator slot is provided between two adjacent stator teeth;

[0006] A stator winding, the stator winding comprising a plurality of coils, wherein the plurality of coils are wound on the plurality of stator teeth in a one-to-one correspondence;

[0007] A heat conducting part is arranged in the stator slot, and the heat conducting part is located between two adjacent coils, and the coil and the stator core are both in contact with the heat conducting part.

[0008] Furthermore, the heat conducting part is a heat conducting plate, and the heat conducting plate is arranged through the stator core in the axial direction.

[0009] Furthermore, along the radial direction of the stator core, the thickness of the heat conducting plate remains unchanged.

[0010] Furthermore, along the radial direction of the stator core, the thickness of the heat conducting plate gradually decreases.

[0011] Furthermore, along the radial direction of the stator core, the thickness of the heat conducting plate gradually increases.

[0012] Furthermore, the coil comprises at least two layers, and the at least two layers of coils are sleeved on the stator teeth at intervals along the radial direction of the stator core;

[0013] The heat conducting plate comprises a main body section and at least one plug-in section, wherein the main body section is arranged to pass through along the axial direction of the stator core, the plug-in section is perpendicular to the main body section and fixedly connected to the main body section, and the plug-in section is inserted between two adjacent layers of the coils and contacts the coils.

[0014] Furthermore, the heat conducting part is an aluminum heat conducting plate or a high thermal conductivity ceramic heat conducting plate.

[0015] Furthermore, along the thickness direction of the heat conducting portion, the heat conducting portion has two side surfaces that are arranged opposite to each other, and the wires of the coil are arranged in sequence along the radial direction of the stator core and form a first side surface on the side wall of the stator slot, and the heat conducting portion contacts the first side surface through the side surface.

[0016] On the other hand, the present application also provides a motor, which includes the above-mentioned stator assembly.

[0017] On the other hand, the present application also provides an electrical device, which includes the above-mentioned motor.

[0018] In the present application, when the stator assembly is actually processed, a plurality of stator punching sheets can be stacked in sequence along the axial direction of the stator core, and then a plurality of stator teeth are arranged on each stator punching sheet along the circumferential direction, and then a plurality of coils are wound on the plurality of stator teeth in a one-to-one correspondence. After assembly, since the heating point of the coil is concentrated at the center line position in the stator slot, the present application installs the heat conducting part in the stator slot, and makes the heat conducting part located between two adjacent coils, and makes the coil and the stator core both contact with the heat conducting part. With such arrangement, when the motor starts to work, since the temperature of the stator core in the motor is lower than the temperature of the coil, and the heat conducting part has a high thermal conductivity, the heat conducting part will conduct the heat generated by the coil to the stator core to achieve the purpose of dispersing the heat, effectively ensuring the uniformity of the heat distribution of the coil, thereby reducing the minimum insulation level allowed by the coil, and thus improving the stability and reliability of the motor.

[0019] That is to say, compared with the structure of the stator core in the prior art, the present application provides a heat-conducting part in the stator slot, and installs the heat-conducting part between two adjacent coils. The structure is simple and easy to install, and it is in direct contact with the coil and the stator core, so that heat conduction can be achieved, thereby ensuring that the uniformity of the heat distribution of the coil on the stator core can be maintained consistent, and to a certain extent, the minimum insulation level allowed for the coil is reduced, thereby improving the stability and reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 This is a schematic diagram of the structure of the first heat conducting plate disclosed in the embodiment of the present application;

[0022] Figure 2 This is a schematic diagram of the structure of the second heat conducting plate disclosed in the embodiment of the present application;

[0023] Figure 3 This is a schematic structural diagram of a third heat conducting plate disclosed in an embodiment of the present application;

[0024] Figure 4 This is a schematic structural diagram of a fourth heat conducting plate disclosed in an embodiment of the present application;

[0025] Figure 5 A schematic diagram of the structure of the stator core disclosed in the embodiment of the present application;

[0026] Figure 6 This is a top view of the stator punching sheet disclosed in the embodiment of the present application.

[0027] The above drawings include the following reference numerals:

[0028] 10. stator core; 11. stator punching sheet; 12. stator teeth; 13. stator slots; 20. stator winding; 21. coil; 30. heat conduction part; 31. heat conduction plate; 311. main body section; 312. plug-in section. DETAILED DESCRIPTION

[0029] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0031] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0032] As mentioned in the background technology, the heat concentration point of the winding in the stator slot of the existing motor is at the position farthest from the stator slot. Especially for the winding structure with concentrated winding arranged left and right, the temperature of the winding at the center line position in the stator slot is the highest. If the temperature of the winding cannot be quickly conducted away, it will cause heat accumulation between the windings in the stator slot, which not only increases the minimum insulation level allowed for the winding in the stator slot, but also affects the overall heat dissipation effect of the motor, thereby reducing the stability and reliability of the motor. Therefore, in order to avoid uneven temperature distribution in the stator slot, the inventor of the present application has designed a new stator assembly, and the stator assembly of the present application will be introduced in detail below.

[0033] It should be noted that the thickness of the heat conducting plate in this application is Figure 1 To Attachment Figure 4 The position indicated by the letter D.

[0034] See also Figures 1 to 6 As shown, the present application provides a stator assembly, which includes a stator core 10 , a stator winding 20 and a heat conducting portion 30 .

[0035] Among them, the stator core 10 includes a plurality of stator punching sheets 11, which are stacked in sequence along the axial direction of the stator core 10, and each stator punching sheet 11 is provided with a plurality of stator teeth 12 in the circumferential direction, and a stator slot 13 is provided between two adjacent stator teeth 12; the stator winding 20 includes a plurality of coils 21, and the plurality of coils 21 are wound on the plurality of stator teeth 12 in a one-to-one correspondence; the heat conducting portion 30 is provided in the stator slot 13, and the heat conducting portion 30 is located between two adjacent coils 21, and the coil 21 and the stator core 10 are both in contact with the heat conducting portion 30.

[0036] In this embodiment, the stator core 10 includes a plurality of stator punchings 11, and the stator winding 20 includes a plurality of coils 21. When the stator assembly is actually processed, the plurality of stator punchings 11 can be stacked in sequence along the axial direction of the stator core 10, and then a plurality of stator teeth 12 are arranged on each stator punching 11 along the circumferential direction, and then a plurality of coils 21 are wound on the plurality of stator teeth 12 in a one-to-one correspondence. After assembly, since the heating point of the coil 21 is concentrated at the center line position in the stator slot 13, in this embodiment, the heat conducting part 30 is installed in the stator slot 13, and the heat conducting part 30 is located between two adjacent coils 21, and the coil 21 and the stator core 10 are both in contact with the heat conducting part 30. With such arrangement, when the motor starts working, since the temperature of the stator core 10 in the motor is lower than the temperature of the coil 21 and the heat conducting part 30 has a high thermal conductivity, the heat conducting part 30 will conduct the heat generated by the coil 21 to the stator core 10 to achieve the purpose of dispersing the heat, effectively ensuring the uniformity of the heat distribution of the coil 21, thereby reducing the minimum insulation level allowed by the coil 21, and further improving the stability and reliability of the motor.

[0037] That is to say, compared with the structure of the stator core 10 in the prior art, in this embodiment, a heat conducting portion 30 is provided in the stator slot 13, and the heat conducting portion 30 is installed between two adjacent coils 21. The heat conducting portion 30 has a simple structure and is easy to install. In addition, the heat conducting portion 30 is in direct contact with the coil 21 and the stator core 10, and heat conduction can be achieved, thereby ensuring that the uniformity of the heat distribution of the coil 21 on the stator core 10 can be kept consistent, and to a certain extent, the minimum insulation level allowed by the coil 21 is reduced, thereby improving the stability and reliability of the motor.

[0038] Furthermore, the heat conducting part 30 in this embodiment is a heat conducting plate 31, and the heat conducting plate 31 is arranged through the axial direction of the stator core 10. That is to say, the heat conducting plate 31 can be applied to stator cores 10 of different lengths, and has a simple structure and strong applicability. In this embodiment, the heat conducting plate 31 is arranged in the stator slot 13, and the heat conducting plate 31 is installed between two adjacent coils 21, and the coil 21 and the stator core 10 are in direct contact with the heat conducting plate 31, which has a simple structure and is easy to install. Since the heat conducting effect of the heat conducting plate 31 is greater than that of insulating materials such as air and coil 21, during the operation of the motor, the heat generated by the coil 21 can be quickly absorbed by the heat conducting plate 31, and at the same time, the heat conducting plate 31 quickly conducts the absorbed heat to the stator core 10 to achieve the purpose of dispersing heat, thereby ensuring the uniformity of the heat distribution of the coil 21, and to a certain extent reducing the minimum insulation level allowed by the coil 21, thereby improving the stability and reliability of the motor. It is understandable that the heat conducting part 30 may also include a structure of other materials with high thermal conductivity such as a heat conducting block, as long as it can ensure that the heat conducting part 30 can conduct the heat generated by the coil 21 to the stator core 10, thereby improving the uniformity of heat distribution of the coil 21.

[0039] Furthermore, the heat conducting plate 31 in this embodiment can be selected in different shapes and sizes according to different shapes of the coil 21. Taking the single-span concentrated winding double-layer structure as an example, see Figure 1 As shown, in one embodiment shown in the present application, the thickness of the heat conducting plate 31 remains unchanged along the radial direction of the stator core 10. That is to say, the heat conducting plate 31 is a rectangular heat conducting plate, and the projection of the heat conducting plate 31 along the axial direction of the stator core 10 is a rectangle. Such a configuration can ensure that there is a small heat conducting gap between the heat conducting plate 31 and the coil 21, so that the heat conducting plate 31 can quickly absorb the heat generated by the coil 21 and quickly conduct the heat to the stator core 10, so as to achieve the effect of rapid heat dissipation, thereby making the uniformity of the heat distribution of each coil 21 consistent.

[0040] Further, taking the double-layer structure of single-span concentrated winding as an example, see Figure 2 As shown, in another embodiment shown in the present application, the thickness of the heat conducting plate 31 gradually decreases along the radial direction of the stator core 10. That is to say, the heat conducting plate 31 is an inverted trapezoidal heat conducting plate, and the projection of the heat conducting plate 31 along the axial direction of the stator core 10 is an inverted trapezoid. In this way, the heat conducting plate 31 can adapt to coils 21 of different shapes, effectively ensuring that there is a small heat conducting gap between the heat conducting plate 31 and the coil 21, so that the heat conducting plate 31 quickly absorbs the heat generated by the coil 21, and quickly conducts the heat to the stator core 10, so as to achieve the effect of rapid heat dissipation, thereby making the uniformity of heat distribution of each coil 21 consistent.

[0041] Further, taking the double-layer structure of single-span concentrated winding as an example, see Figure 3 As shown, in another embodiment shown in the present application, the thickness of the heat conducting plate 31 gradually increases along the radial direction of the stator core 10. That is to say, the heat conducting plate 31 is a right trapezoidal heat conducting plate, and the projection of the heat conducting plate 31 along the axial direction of the stator core 10 is a right trapezoid. In this way, the heat conducting plate 31 can adapt to coils 21 of different shapes, effectively ensuring that there is a small heat conducting gap between the heat conducting plate 31 and the coil 21, so that the heat conducting plate 31 can quickly absorb the heat generated by the coil 21, and quickly conduct the heat to the stator core 10, so as to achieve the effect of rapid heat dissipation, thereby making the uniformity of heat distribution of each coil 21 consistent.

[0042] It is understandable that the heat conducting plate 31 may also include a polygonal structure such as a pentagon or a hexagon. In other words, the actual shape of the heat conducting plate 31 may be designed according to the actual shape of the coil 21 .

[0043] Further, taking the coil 21 with layers in both upper and lower and left and right directions as an example, see Figure 4As shown, in another embodiment shown in the present application, the coil 21 includes at least two layers, and at least two layers of coils 21 are sleeved on the stator teeth 12 at intervals along the radial direction of the stator core 10; the heat conducting plate 31 has a main section 311 and at least one plug-in section 312, the main section 311 is arranged through the axial direction of the stator core 10, the plug-in section 312 is perpendicular to the main section 311 and fixedly connected to the main section 311, and the plug-in section 312 is inserted between two adjacent layers of coils 21 and contacts the coils 21. In this way, the coils 21 of each layer can be in contact with the heat conducting plate 31, and a small heat conducting gap is effectively ensured between the heat conducting plate 31 and the coils 21, so that the heat conducting plate 31 quickly absorbs the heat generated by the coils 21, and quickly conducts the heat to the stator core 10, so as to achieve the effect of rapid heat dissipation, thereby making the uniformity of heat distribution of each coil 21 consistent.

[0044] Specifically, the present application divides the same coil 21 into two layers and sets them on the stator teeth 12, and the two layers of coils 21 are connected.

[0045] It can be understood that the coil 21 in the present application may include two layers, three layers, four layers, or more than four layers. Figure 4 The case where the coil 21 is two layers is shown; the plug-in section 312 of the present application may include one, two, three or four, as long as it can be ensured that there is a plug-in section 312 between the two layers of coils 21. Figure 4 The case where there is only one plug-in section 312 is shown.

[0046] Furthermore, the heat conducting part 30 in this embodiment is an aluminum heat conducting plate or a high thermal conductivity ceramic heat conducting plate. Since aluminum is a metal with good thermal conductivity and ceramic has high thermal conductivity, the present application uses aluminum and ceramic as the manufacturing material of the heat conducting plate 31 to improve the heat conduction capacity of the heat conducting plate 31, effectively preventing the heat conducting plate 31 from failing to quickly absorb the heat generated by the coil 21, so that the heat of the coil 21 is quickly conducted to the stator core 10 by the heat conducting plate 31, so that the uniformity of the heat distribution of each coil 21 remains consistent.

[0047] Further, along the thickness direction of the heat conducting portion 30, the heat conducting portion 30 in this embodiment has two side surfaces that are arranged opposite to each other, and the wires of the coil 21 are arranged in sequence along the radial direction of the stator core 10 and form a first side surface on the side wall of the stator slot 13, and the heat conducting portion 30 contacts the first side surface through the side surface. Specifically, the present application defines the surface where the coil 21 contacts the heat conducting portion 30 as the first side surface. That is to say, along the thickness direction of the heat conducting plate 31, the heat conducting plate 31 in this embodiment has two side surfaces that are arranged opposite to each other, and the wires of the coil 21 are arranged in sequence along the radial direction of the stator core 10 and form a first side surface on the side wall of the stator slot 13, and the heat conducting plate 31 contacts the first side surface through the side surface. The contact mode between the heat conducting plate 31 and the coil 21 is surface contact. In this way, the contact area between the coil 21 and the heat conducting plate 31 is increased to a certain extent, thereby increasing the heat transfer area of ​​the heat conducting plate 31, and then improving the heat conduction efficiency of the heat conducting plate 31, and finally realizing the rapid conduction of heat, so as to achieve the purpose of maintaining the uniformity of heat distribution of each coil 21 consistent.

[0048] From the above description, it can be seen that the above-mentioned embodiments of the present application achieve the following technical effects: relative to the structure of the stator core in the prior art, the present application compensates for the deficiency that the heat generated by the coil cannot be quickly conducted to the stator core by arranging heat-conducting plates of different shapes in the stator slots. The presence of the heat-conducting plates can realize heat conduction, thereby ensuring that the uniformity of the heat distribution of the coil on the stator core can be maintained consistent, which reduces the minimum allowable insulation level of the coil to a certain extent, thereby improving the stability and reliability of the motor.

[0049] On the other hand, the embodiment of the present application further provides a motor, which includes the above-mentioned stator assembly, and thus the motor includes all the technical effects of the above-mentioned stator assembly. Since the technical effects of the stator assembly have been described in detail above, they will not be repeated here.

[0050] On the other hand, the embodiment of the present application further provides an electrical device, which includes the above-mentioned motor, and thus the electrical device includes all the technical effects of the above-mentioned motor. Since the technical effects of the motor have been described in detail above, they will not be repeated here.

[0051] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0052] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0053] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A stator assembly, characterized in that: include: A stator core (10), the stator core (10) comprising a plurality of stator punching sheets (11), the plurality of stator punching sheets (11) being stacked in sequence along the axial direction of the stator core (10), a plurality of stator teeth (12) being arranged in the circumferential direction of each stator punching sheet (11), and a stator slot (13) being provided between two adjacent stator teeth (12); A stator winding (20), the stator winding (20) comprising a plurality of coils (21), the plurality of coils (21) being wound one-to-one on the plurality of stator teeth (12); A heat conducting portion (30), the heat conducting portion (30) being arranged in the stator slot (13), and the heat conducting portion (30) being located between two adjacent coils (21), and the coils (21) and the stator core (10) are both in contact with the heat conducting portion (30).

2. The stator assembly according to claim 1, characterized in that: The heat conducting portion (30) is a heat conducting plate (31), and the heat conducting plate (31) is arranged to penetrate along the axial direction of the stator core (10).

3. The stator assembly according to claim 2, characterized in that: Along the radial direction of the stator core (10), the thickness of the heat conducting plate (31) remains constant.

4. The stator assembly according to claim 2, characterized in that: Along the radial direction of the stator core (10), the thickness of the heat conducting plate (31) gradually decreases.

5. The stator assembly according to claim 2, characterized in that: Along the radial direction of the stator core (10), the thickness of the heat conducting plate (31) gradually increases.

6. The stator assembly according to claim 2, characterized in that: The coil (21) comprises at least two layers, and the at least two layers of the coil (21) are sleeved on the stator teeth (12) at intervals along the radial direction of the stator core (10); The heat conducting plate (31) comprises a main body section (311) and at least one plug-in section (312); the main body section (311) is arranged to pass through along the axial direction of the stator core (10); the plug-in section (312) is perpendicular to the main body section (311) and is fixedly connected to the main body section (311); and the plug-in section (312) is inserted between two adjacent layers of the coils (21) and is in contact with the coils (21).

7. The stator assembly according to any one of claims 1 to 6, characterized in that: The heat conducting part (30) is an aluminum heat conducting plate or a high thermal conductivity ceramic heat conducting plate.

8. The stator assembly according to any one of claims 1 to 6, characterized in that: Along the thickness direction of the heat conducting portion (30), the heat conducting portion (30) has two side surfaces that are arranged opposite to each other, and the conductive wires of the coil (21) are arranged in sequence along the radial direction of the stator core (10) and form a first side surface on the side wall of the stator slot (13), and the heat conducting portion (30) is in contact with the first side surface through the side surface.

9. A motor, characterized in that: The electric machine comprises the stator assembly according to any one of claims 1 to 8.

10. An electrical device, characterized in that: The electrical equipment comprises the motor according to claim 9.

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