Rotor assembly and motor

Abstract

The utility model discloses a rotor assembly and a motor. The rotor assembly comprises a rotor iron core and a heat exchange part. The rotor core comprises a plurality of rotor punching sheets, the plurality of rotor punching sheets are sequentially stacked in the axis direction of the rotor core, a plurality of heat exchange holes are formed in the circumferential direction of each rotor punching sheet, and a mounting groove is formed between every two adjacent heat exchange holes; the heat exchange component is arranged in the heat exchange hole, the heat exchange component comprises a plurality of heat exchange strips, the heat exchange strips are arranged in a radial shape from the center of the heat exchange hole to the periphery, and a heat exchange channel is formed between every two adjacent heat exchange strips. The heat exchange hole structure can solve the problem that in the prior art, the heat exchange power of the unit sectional area of a heat exchange hole structure is small.

Description

Technical Field

[0001] The present application relates to the technical field of motors, and in particular to a rotor assembly and a motor. Background Art

[0002] During the operation of the motor, the permanent magnet rotor poles and permanent magnets will generate heat. After long-term operation, the increase in rotor temperature will lead to thermal demagnetization of the permanent magnets and reduced strength of the rotor punching. Therefore, in order to improve the heat exchange efficiency of the motor, heat exchange holes are mostly added to the rotor core so that the rotor core can be fully heat exchanged during the operation of the motor.

[0003] However, the axial heat exchange holes of existing motors are mostly conventionally circular or square. The heat exchange power per unit cross-sectional area of ​​the heat exchange hole structure is relatively small, and is not suitable for high-pressure or high-power motors that require high heat exchange effects. High-pressure or high-power motors mostly increase the heat exchange power by adding axial ventilation holes, but this will increase the motor volume and the difficulty of processing the rotor core. Utility Model Content

[0004] The main purpose of the present application is to provide a rotor assembly and a motor to solve the problem of low heat exchange power per unit cross-sectional area of ​​the heat exchange hole structure in the prior art.

[0005] According to one aspect of the present application, there is provided a rotor assembly, comprising:

[0006] A rotor core, wherein the rotor core comprises a plurality of rotor punchings, wherein the plurality of rotor punchings are stacked in sequence along the axial direction of the rotor core, wherein each of the rotor punchings is provided with a plurality of heat exchange holes in the circumferential direction, and a mounting groove is provided between two adjacent heat exchange holes;

[0007] A heat exchange component is arranged in the heat exchange hole, and the heat exchange component includes a plurality of heat exchange strips, which are radially arranged from the center of the heat exchange hole to the periphery, and a heat exchange channel is provided between two adjacent heat exchange strips.

[0008] Furthermore, the heat exchange strips include linear heat exchange strips, the heat exchange channel is provided between two adjacent linear heat exchange strips, and the distance between two adjacent linear heat exchange strips gradually increases along the radial direction of the heat exchange holes.

[0009] Furthermore, the heat exchange strip further comprises a first annular heat exchange strip, the first annular heat exchange strip is located at the center of the heat exchange hole, and one end of the linear heat exchange strip close to the center of the heat exchange hole is fixedly connected to the first annular heat exchange strip.

[0010] Furthermore, the heat exchange strip comprises a Y-shaped heat exchange strip, the Y-shaped heat exchange strip comprises a straight segment and a forked segment, the straight segment and the forked segment are fixedly connected, the straight segment is arranged near the center of the heat exchange hole, and the forked segment is arranged near the edge of the heat exchange hole.

[0011] Furthermore, the heat exchange strip further comprises a second annular heat exchange strip, the second annular heat exchange strip is located at the center of the heat exchange hole, and one end of the straight line segment close to the center of the heat exchange hole is fixedly connected to the second annular heat exchange strip.

[0012] Furthermore, the heat exchange strip comprises a metal heat exchange strip.

[0013] Furthermore, the heat exchange strip and the heat exchange hole are fixedly connected by interference fit.

[0014] Furthermore, the heat exchange holes include circular, square or trapezoidal shapes.

[0015] Furthermore, the mounting groove includes a mounting section and two protruding sections, and along the length direction of the mounting section, the two protruding sections are arranged on two opposite sides of the mounting section.

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

[0017] In the present application, when actually processing the rotor assembly, multiple rotor punchings can be stacked in sequence along the axial direction of the rotor core, and then multiple heat exchange holes can be set on each rotor punching along the circumferential direction to achieve heat exchange with the air in the inner cavity of the motor, thereby achieving heat dissipation of the rotor assembly, and a mounting groove is set between two adjacent heat exchange holes for installing magnetic steel, and then multiple heat exchange bars are installed in the heat exchange holes, and the multiple heat exchange bars are radially arranged from the center of the heat exchange hole to the periphery, and two adjacent heat exchange bars are arranged at intervals to form a heat exchange channel. In this way, when the motor starts working, the hot air in the inner cavity of the motor flows through the heat exchange channel and contacts the heat exchange bars. The presence of multiple heat exchange bars can obtain the heat of the rotor core and transmit it, which increases the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole to a certain extent, thereby improving the heat exchange efficiency of the rotor assembly, and then achieving the conduction of higher-power rotor heating power.

[0018] Compared with the structure of the heat exchange hole in the prior art, the present application has multiple heat exchange strips arranged inside the heat exchange hole, and the heat exchange strips are arranged radially from the center of the heat exchange hole to the periphery, and there is a heat exchange channel between two adjacent heat exchange strips, which can increase the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole, thereby improving the heat exchange efficiency of the rotor assembly, and then realizing the conduction of higher power rotor heating power. At the same time, since multiple heat exchange strips are in direct contact with the heat exchange hole, after obtaining the heat of the rotor assembly, it can be quickly conducted to other parts of the motor for further heat dissipation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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:

[0020] Figure 1 This is a schematic diagram of the structure of a linear heat exchange strip disclosed in an embodiment of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of the Y-shaped heat exchange strip disclosed in the embodiment of the present application;

[0022] Figure 3 It is a schematic diagram of the structure of the rotor punching sheet disclosed in the embodiment of the present application;

[0023] Figure 4 This is a schematic diagram of the structure of the rotor assembly disclosed in an embodiment of the present application.

[0024] The above drawings include the following reference numerals:

[0025] 10. Rotor core; 11. Heat exchange hole; 12. Mounting groove; 121. Mounting section; 122. Protruding section; 13. Rotor punching sheet; 20. Heat exchange component; 21. Heat exchange strip; 211. Linear heat exchange strip; 212. First annular heat exchange strip; 213. Y-type heat exchange strip; 214. Second annular heat exchange strip; 22. Heat exchange channel. DETAILED DESCRIPTION

[0026] 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.

[0027] 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.

[0028] 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.

[0029] As mentioned in the background technology, the heat exchange holes of existing motors usually adopt a circular or square structure. The heat exchange power per unit cross-sectional area of ​​the heat exchange structure is small and is not suitable for applications of high-voltage or high-power motors that require high heat exchange effects. Therefore, in order to increase the heat exchange power per unit cross-sectional area of ​​the heat exchange holes, the inventor of the present application has designed a new rotor assembly, which will be described in detail below.

[0030] See also Figures 1 to 4 As shown, the present application provides a rotor assembly, which includes a rotor core 10 and a heat exchange component 20 .

[0031] Among them, the rotor core 10 includes a plurality of rotor punchings 13, which are stacked in sequence along the axial direction of the rotor core 10, and each rotor punching 13 is provided with a plurality of heat exchange holes 11 in the circumferential direction, and a mounting groove 12 is provided between two adjacent heat exchange holes 11; the heat exchange component 20 is arranged in the heat exchange hole 11, and the heat exchange component 20 includes a plurality of heat exchange bars 21, and the plurality of heat exchange bars 21 are radially arranged along the center of the heat exchange hole 11 to the periphery, and a heat exchange channel 22 is provided between two adjacent heat exchange bars 21.

[0032] In this embodiment, the rotor core 10 includes a plurality of rotor punchings 13 , and the heat exchange component 20 includes a plurality of heat exchange bars 21 . When the rotor assembly is actually processed, a plurality of rotor punchings 13 can be stacked in sequence along the axial direction of the rotor core 10, and then a plurality of heat exchange holes 11 are set on each rotor punching 13 along the circumferential direction for achieving heat exchange with the air in the inner cavity of the motor, thereby achieving heat dissipation of the rotor assembly, and a mounting groove 12 is set between two adjacent heat exchange holes 11 for installing magnetic steel, and then a plurality of heat exchange bars 21 are installed in the heat exchange holes 11, and the plurality of heat exchange bars 21 are arranged radially from the center of the heat exchange hole 11 to the periphery, and two adjacent heat exchange bars 21 are arranged at intervals to form a heat exchange channel 22. In this way, when the motor starts to work, the hot air in the inner cavity of the motor flows through the heat exchange channel 22 and contacts the heat exchange bar 21. The presence of the plurality of heat exchange bars 21 can obtain the heat of the rotor core 10 and transmit it, which increases the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole 11 to a certain extent, thereby improving the heat exchange efficiency of the rotor assembly, and then achieving the conduction of rotor heating power with higher power.

[0033] Compared with the structure of the heat exchange hole 11 in the prior art, this embodiment is provided with a plurality of heat exchange strips 21 inside the heat exchange hole 11, and the heat exchange strips 21 are radially arranged from the center to the periphery of the heat exchange hole 11, and a heat exchange channel 22 is provided between two adjacent heat exchange strips 21, which can increase the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole 11, thereby improving the heat exchange efficiency of the rotor assembly, and further realizing the conduction of rotor heating power with greater power. At the same time, since the plurality of heat exchange strips 21 are in direct contact with the hot air, after obtaining the heat from the inner cavity of the motor, it can be quickly conducted to other components of the motor for further heat dissipation.

[0034] Further, see Figure 1 As shown, in one embodiment shown in the present application, the heat exchange strip 21 includes a linear heat exchange strip 211, and a heat exchange channel 22 is provided between two adjacent linear heat exchange strips 211. Along the radial direction of the heat exchange hole 11, the distance between the two adjacent linear heat exchange strips 211 gradually increases. In other words, the two adjacent linear heat exchange strips 211 are arranged in the heat exchange hole 11 in a fan-shaped structure, which has a simple structure and is easy to install. At the same time, it can improve the flow capacity of the heat exchange channel 22, effectively ensuring that the hot air generated in the motor cavity is in full contact with the heat exchange strip 21, thereby increasing the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole 11, and then improving the heat exchange efficiency of the rotor assembly, and finally realizing the conduction of the rotor heating power with a higher power. In addition, in this embodiment, the linear heat exchange strips 211 are arranged in the heat exchange hole 11 at equal intervals, which can ensure the balance of heat exchange in the heat exchange hole 11.

[0035] Further, see Figure 1As shown, the heat exchange strip 21 of this embodiment also includes a first annular heat exchange strip 212, which is located at the center of the heat exchange hole 11, and one end of the linear heat exchange strip 211 close to the center of the heat exchange hole 11 is fixedly connected to the first annular heat exchange strip 212, and one end of the linear heat exchange strip 211 away from the center of the heat exchange hole 11 is fixedly connected to the edge of the heat exchange hole 11. Among them, the first annular heat exchange strip 212 is an annular structure. In this embodiment, the first annular heat exchange strip 212 is set as an annular structure, and the linear heat exchange strip 211 is fixedly connected to the annular structure, which can not only play a good fixing and supporting role for the linear heat exchange strip 211, effectively prevent the heat exchange strip 21 from falling off, thereby ensuring the normal operation of the rotor assembly, but also has a good heat exchange capacity, so as to increase the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole 11, thereby realizing the conduction of rotor heating power with a higher power. In addition, the annular space formed by the first annular heat exchange strip 212 can also be used as a heat exchange channel 22 to allow the hot air generated in the engine cavity to circulate.

[0036] Further, see Figure 2 As shown, in another embodiment shown in the present application, the heat exchange strip 21 includes a Y-shaped heat exchange strip 213, and the Y-shaped heat exchange strip 213 includes a straight section and a forked section, the straight section and the forked section are fixedly connected, the straight section is arranged near the center of the heat exchange hole 11, and the forked section is arranged near the edge of the heat exchange hole 11. In other words, the Y-shaped heat exchange strip 213 is composed of three heat exchange strips. The increase in the number of heat exchange strips increases the number of heat exchange channels 22, thereby increasing the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole 11, and further increasing the heat exchange efficiency and heat exchange power between the heat exchange hole 11 and the hot air. In addition, in this embodiment, the Y-shaped heat exchange strips 213 are arranged at equal intervals in the heat exchange hole 11, which can ensure the balance of heat exchange in the heat exchange hole 11.

[0037] Further, see Figure 2 As shown, the heat exchange strip 21 of this embodiment also includes a second annular heat exchange strip 214, which is located at the center of the heat exchange hole 11, and one end of the straight section close to the center of the heat exchange hole 11 is fixedly connected to the second annular heat exchange strip 214. Among them, the second annular heat exchange strip 214 is an annular structure. In this embodiment, the second annular heat exchange strip 214 is set as an annular structure, and the straight section in the Y-type heat exchange strip 213 is fixedly connected to the annular structure, which can not only play a good fixing and supporting role for the Y-type heat exchange strip 213, effectively prevent the heat exchange strip from falling off, thereby ensuring the normal operation of the rotor assembly, but also has a good heat exchange capacity to increase the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole 11, thereby realizing the conduction of higher power rotor heating power. In addition, the annular space formed by the second annular heat exchange strip 214 can also be used as a heat exchange channel 22 to provide circulation for the hot air generated in the motor cavity.

[0038] It is understandable that in embodiments not shown in the present application, the heat exchange strip 21 may also be installed in the heat exchange hole 11 according to other structures, which are not limited to those in the present application. Figure 1 to Figure 2 The structure of the heat exchange strip 21 shown in the figure only needs to ensure that there is a heat exchange channel 22 between two adjacent heat exchange strips 21 and the heat exchange strip 21 can be interference fit on the heat exchange hole 11. Other structures of the heat exchange strip 21 are not specifically limited in this application and can be designed according to actual processing requirements.

[0039] Furthermore, the heat exchange strip 21 of this embodiment includes a metal heat exchange strip. That is, copper or aluminum can be selected as the heat exchange strip 21. Of course, other materials with high thermal conductivity can also be selected. In actual settings, the metal heat exchange strip is arranged as follows: Figure 1 to Figure 2 The structure is installed in the heat exchange hole 11 to form a heat exchange channel 22. After the metal heat exchange strip is installed, the heat exchange strip 21 is in direct contact with the hot air generated in the motor to achieve heat conduction.

[0040] Specifically, the metal heat exchange strip in this embodiment is preferably an aluminum heat exchange strip. Aluminum is a metal with good thermal conductivity. Using aluminum as the material for making the heat exchange strip 21 can improve the thermal conductivity of the heat exchange strip 21, thereby improving the heat exchange efficiency of the rotor assembly.

[0041] Furthermore, the heat exchange strip 21 in this embodiment is fixedly connected to the heat exchange hole 11 by means of interference fit. This arrangement can prevent the heat exchange strip 21 from falling off from the heat exchange hole 11 during high-speed operation of the motor, effectively ensuring the normal operation of the rotor assembly, thereby increasing the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole 11, and then improving the heat exchange efficiency of the rotor assembly, thereby achieving the conduction of higher-power rotor heating power.

[0042] Furthermore, the heat exchange holes 11 of this embodiment include a circular shape, a square shape, or a trapezoidal shape. Figure 1 To Attachment Figure 4 The heat exchange hole 11 is shown as a circular shape. It is understandable that the heat exchange hole 11 of this embodiment may also include other polygonal structures such as a pentagon or a hexagon. The existence of the heat exchange hole 11 can not only be used to achieve heat exchange with the air in the inner cavity of the motor, but also can reduce the overall weight of the rotor assembly, thereby reducing the weight of the motor.

[0043] Further, see Figure 4 As shown, the mounting groove 12 of this embodiment includes a mounting section 121 and two protruding sections 122. Figure 4In the embodiment, the two protruding sections 122 are arranged on opposite sides of the mounting section 121. The mounting section 121 is used to mount the magnetic steel, and the protruding section 122 is used to mount the magnetic isolation body. Since the magnetic steel has good magnetic properties, a strong magnetic field can be formed between the multiple magnetic steels when the motor is running at high speed. In this embodiment, the magnetic isolation body is installed in the protruding section 122, which can limit the leakage magnetic flux, thereby improving the utilization rate of the magnetic steel and effectively ensuring the normal operation of the motor.

[0044] 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 heat exchange hole in the center of the prior art, the present application compensates for the deficiency of the small heat exchange power per unit cross-sectional area of ​​the heat exchange hole by arranging heat exchange strips with different structures inside the heat exchange hole, and to a certain extent increases the heat exchange surface area per unit cross-sectional area of ​​the heat exchange hole, thereby improving the heat exchange efficiency of the rotor assembly, and further realizing the conduction of higher-power rotor heating power.

[0045] On the other hand, the embodiment of the present application further provides a motor, which includes the above-mentioned rotor assembly, and thus the motor includes all the technical effects of the above-mentioned rotor assembly. Since the technical effects of the rotor assembly have been described in detail above, they will not be repeated here.

[0046] 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.

[0047] 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.

[0048] 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 rotor assembly, characterized in that: include: A rotor core (10), the rotor core (10) comprising a plurality of rotor punchings (13), the plurality of rotor punchings (13) being stacked in sequence along the axial direction of the rotor core (10), a plurality of heat exchange holes (11) being arranged in the circumferential direction of each of the rotor punchings (13), and a mounting groove (12) being arranged between two adjacent heat exchange holes (11); A heat exchange component (20), the heat exchange component (20) being arranged in the heat exchange hole (11), the heat exchange component (20) comprising a plurality of heat exchange strips (21), the plurality of heat exchange strips (21) being arranged radially from the center of the heat exchange hole (11) to the periphery, and a heat exchange channel (22) being provided between two adjacent heat exchange strips (21).

2. The rotor assembly according to claim 1, characterized in that The heat exchange strips (21) include straight heat exchange strips (211), the heat exchange channel (22) is provided between two adjacent straight heat exchange strips (211), and the distance between two adjacent straight heat exchange strips (211) gradually increases along the radial direction of the heat exchange hole (11).

3. The rotor assembly according to claim 2, characterized in that: The heat exchange strip (21) further comprises a first annular heat exchange strip (212), wherein the first annular heat exchange strip (212) is located at the center of the heat exchange hole (11), and one end of the linear heat exchange strip (211) close to the center of the heat exchange hole (11) is fixedly connected to the first annular heat exchange strip (212).

4. The rotor assembly according to claim 1, characterized in that: The heat exchange strip (21) comprises a Y-shaped heat exchange strip (213), wherein the Y-shaped heat exchange strip (213) comprises a straight section and a forked section, wherein the straight section and the forked section are fixedly connected, wherein the straight section is arranged close to the center of the heat exchange hole (11), and the forked section is arranged close to the edge of the heat exchange hole (11).

5. The rotor assembly according to claim 4, characterized in that: The heat exchange strip (21) further comprises a second annular heat exchange strip (214), wherein the second annular heat exchange strip (214) is located at the center of the heat exchange hole (11), and one end of the straight line segment close to the center of the heat exchange hole (11) is fixedly connected to the second annular heat exchange strip (214).

6. The rotor assembly according to any one of claims 1 to 5, characterized in that: The heat exchange strip (21) comprises a metal heat exchange strip.

7. The rotor assembly according to any one of claims 1 to 5, characterized in that: The heat exchange strip (21) and the heat exchange hole (11) are fixedly connected by means of interference fit.

8. The rotor assembly according to any one of claims 1 to 5, characterized in that: The heat exchange holes (11) include circular, square or trapezoidal shapes.

9. The rotor assembly according to any one of claims 1 to 5, characterized in that: The mounting groove (12) comprises a mounting section (121) and two protruding sections (122); along the length direction of the mounting section (121), the two protruding sections (122) are arranged on two opposite sides of the mounting section (121).

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

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