Rotor assembly and motor

Abstract

The utility model discloses a rotor assembly and a motor. The rotor assembly comprises a rotor core and a permanent magnet component. The rotor core is provided with a plurality of first magnetic steel grooves and a plurality of second magnetic steel grooves, the plurality of first magnetic steel grooves and the plurality of second magnetic steel grooves are alternately arranged along the circumferential direction of the rotor core, each first magnetic steel groove comprises a first section and a second section, the first section is communicated with the second section, a first magnetic isolation bridge is arranged between the first section and the second magnetic steel groove, and a second magnetic isolation bridge is arranged between the second magnetic steel groove and the first magnetic isolation bridge. A second magnetic isolation bridge is arranged between the second section and the second magnetic steel groove; the permanent magnet component comprises a plurality of first permanent magnets and a plurality of second permanent magnets, the magnetic performance of the first permanent magnets is larger than or equal to that of the second permanent magnets, the first permanent magnets are arranged in the first magnetic steel grooves in a one-to-one correspondence mode, and the second permanent magnets are arranged in the second magnetic steel grooves in a one-to-one correspondence mode. According to the permanent magnet synchronous motor, the problem of large flux leakage of a strong and weak magnetic field hybrid excitation permanent magnet synchronous motor and a conventional built-in tangential permanent magnet synchronous motor in the prior art can be solved.

Description

Technical Field

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

[0002] At present, strong and weak magnetic field hybrid excitation permanent magnet synchronous motors and built-in tangential permanent magnet synchronous motors mostly use conventional rotor slot structures. On the one hand, the number of magnetic isolation bridges is small and the magnetic field path is limited, which easily leads to more magnetic lines failing to pass through the air gap and simultaneously interlink the stator and rotor, resulting in more leakage magnetic flux, which greatly reduces the utilization efficiency of the permanent magnet. On the other hand, the cooling and ventilation area of ​​the rotor is small, and the heat dissipation environment of the permanent magnet is poor. When the temperature rises, it is very likely to cause the permanent magnet to demagnetize. Utility Model Content

[0003] The main purpose of the present application is to provide a rotor assembly and a motor to solve the problem of large magnetic leakage in the strong and weak magnetic field hybrid excitation permanent magnet synchronous motor and the conventional built-in tangential permanent magnet synchronous motor in the prior art.

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

[0005] A rotor core, wherein a plurality of first magnetic steel slots and a plurality of second magnetic steel slots are provided on the rotor core, wherein the plurality of first magnetic steel slots and the plurality of second magnetic steel slots are alternately arranged along the circumferential direction of the rotor core, wherein the first magnetic steel slot comprises a first section and a second section, wherein the first section is connected to the second section, wherein a first magnetic isolation bridge is provided between the first section and the second magnetic steel slot, and a second magnetic isolation bridge is provided between the second section and the second magnetic steel slot;

[0006] A permanent magnet component, wherein the permanent magnet component includes a plurality of first permanent magnets and a plurality of second permanent magnets, the magnetic properties of the first permanent magnets are greater than or equal to the magnetic properties of the second permanent magnets, the plurality of first permanent magnets are arranged one-to-one in a plurality of first magnetic steel slots, and the plurality of second permanent magnets are arranged one-to-one in a plurality of second magnetic steel slots.

[0007] Furthermore, the first section extends along the radial direction of the rotor core, the first permanent magnet is arranged in the first section, the second section is arranged at one end of the first section close to the center of the rotor core, and the second section extends along the circumferential direction of the rotor core, and a third magnetic isolation bridge is provided between each adjacent two second sections.

[0008] Further, a width of the second section along the radial direction of the rotor core gradually decreases from a center of the second section toward two opposite ends of the second section.

[0009] Further, both opposite ends of the second section are provided with chamfered corners, and the chamfered corners are located on a side of the second section away from the center of the rotor core; and / or,

[0010] The chamfered corners are arranged at opposite ends of the second section, and the chamfered corners are located at a side of the second section close to the center of the rotor core.

[0011] Further, both opposite ends of the second section are provided with rounded corners, and the rounded corners are located on a side of the second section away from the center of the rotor core; and / or,

[0012] The chamfered corners are arranged at opposite ends of the second section, and the chamfered corners are located at a side of the second section close to the center of the rotor core.

[0013] Furthermore, a first limiting portion is provided at one end of the first section close to the second section, and the first limiting portion includes two first limiting portions, which are arranged on opposite sides of the second section along the circumferential direction of the rotor core, and the first permanent magnet abuts against the first limiting portion.

[0014] Further, the first limiting portion is a first limiting protrusion, and the first limiting protrusion is recessed from the edge of the first section toward the inner side of the first section.

[0015] Further, the second magnetic steel slot extends along the circumferential direction of the rotor core, the second magnetic steel slot includes a third section and a fourth section, the fourth section includes two, the two fourth sections are arranged on opposite sides of the third section, and the third section and the fourth section are connected, the second permanent magnet is arranged in the third section, and a second limiting portion is arranged between the third section and the fourth section, the second limiting portion includes at least two, at least two second limiting portions are arranged on opposite sides of the third section along the circumferential direction of the rotor core, and the second permanent magnet abuts against the second limiting portion.

[0016] Further, the second limiting portion is a second limiting protrusion, and the second limiting protrusion is recessed from the edge of the fourth section toward the inner side of the fourth section.

[0017] On the other hand, the present application also provides a motor, which includes the above-mentioned rotor assembly.

[0018] In the present application, since a plurality of first magnetic steel slots and a plurality of second magnetic steel slots are alternately arranged on the rotor core (i.e., a second magnetic steel slot is provided between each two adjacent first magnetic steel slots), and the first magnetic steel slot includes a first section and a second section, when a plurality of first permanent magnets are inserted into the plurality of first magnetic steel slots one by one, and a plurality of second permanent magnets are inserted into the plurality of second permanent magnet slots one by one, a first magnetic isolation bridge will be provided between the first section and the second magnetic steel slot, and a second magnetic isolation bridge will be provided between the second section and the second magnetic steel slot. At this time, the first magnetic isolation bridge and the second magnetic isolation bridge both include a plurality of magnetic isolation bridges. That is to say, compared with the rotor slot structure of the strong and weak magnetic field mixed excitation and the built-in tangential permanent magnet synchronous motor in the prior art, the present application increases the number of magnetic isolation bridges, and the presence of a plurality of first magnetic isolation bridges and a plurality of second magnetic isolation bridges can optimize the magnetic circuit, thereby extending the magnetic field path, and then reducing the magnetic leakage of the permanent magnet, thereby improving the utilization rate of the permanent magnet to a certain extent, and at the same time, under the condition of the same output torque, reducing the amount of permanent magnets, thereby reducing the material cost. 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 It is a schematic diagram of the structure of the rotor assembly disclosed in the embodiment of the present application;

[0021] Figure 2 The attached embodiment disclosed in this application Figure 1 A magnified schematic diagram of the middle A area;

[0022] Figure 3 This is a schematic structural diagram of the first magnetic steel slot disclosed in the embodiment of the present application;

[0023] Figure 4 This is a schematic structural diagram of the second first magnetic steel slot disclosed in an embodiment of the present application;

[0024] Figure 5 This is a schematic structural diagram of the third first magnetic steel slot disclosed in the embodiment of the present application;

[0025] Figure 6 This is a schematic structural diagram of the fourth first magnetic steel slot disclosed in an embodiment of the present application;

[0026] Figure 7 This is a schematic structural diagram of the fifth first magnetic steel slot disclosed in an embodiment of the present application.

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

[0028] 10. Rotor core; 11. First magnetic steel slot; 111. First section; 112. Second section; 1121. Chamfered corner; 1122. Rounded corner; 12. Second magnetic steel slot; 121. Third section; 122. Fourth section; 20. Permanent magnet component; 21. First permanent magnet; 22. Second permanent magnet; 30. First magnetic isolation bridge; 40. Second magnetic isolation bridge; 50. Third magnetic isolation bridge; 60. First limiting portion; 61. First limiting protrusion; 70. Second limiting portion; 71. Second limiting protrusion. 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 described in the background technology, most of the existing strong and weak magnetic field hybrid excitation permanent magnet synchronous motors and built-in tangential permanent magnet synchronous motors use conventional rotor slot structures, which results in a small number of magnetic isolation bridges and a limited magnetic field path, resulting in more magnetic lines of force failing to pass through the air gap and simultaneously interlink the stator and rotor, thus causing magnetic leakage. Therefore, in order to avoid magnetic leakage from permanent magnets, the inventor of this application has designed a new rotor assembly, which will be described in detail below.

[0033] It should be noted that the circumferential direction of the rotor core in this application is Figure 1 The direction indicated by the letter X.

[0034] See also Figures 1 to 7 As shown, the present application provides a rotor assembly, which includes a rotor core 10 and a permanent magnet component 20 .

[0035] Among them, the rotor core 10 is provided with a plurality of first magnetic steel slots 11 and a plurality of second magnetic steel slots 12, and the plurality of first magnetic steel slots 11 and the plurality of second magnetic steel slots 12 are alternately arranged along the circumferential direction of the rotor core 10, the first magnetic steel slot 11 includes a first section 111 and a second section 112, the first section 111 is connected to the second section 112, a first magnetic isolation bridge 30 is provided between the first section 111 and the second magnetic steel slot 12, and a second magnetic isolation bridge 40 is provided between the second section 112 and the second magnetic steel slot 12; the permanent magnet component 20 includes a plurality of first permanent magnets 21 and a plurality of second permanent magnets 22, the magnetic properties of the first permanent magnets 21 are greater than or equal to the magnetic properties of the second permanent magnets 22, the plurality of first permanent magnets 21 are arranged one-to-one in the plurality of first magnetic steel slots 11, and the plurality of second permanent magnets 22 are arranged one-to-one in the plurality of second magnetic steel slots 12.

[0036] Since the multiple first magnetic steel slots 11 and the multiple second magnetic steel slots 12 in this embodiment are alternately arranged on the rotor core 10 (that is, a second magnetic steel slot 12 is provided between every two adjacent first magnetic steel slots 11), and the first magnetic steel slot 11 includes a first section 111 and a second section 112, when the multiple first permanent magnets 21 are inserted into the multiple first magnetic steel slots 11 one by one, and the multiple second permanent magnets 22 are inserted into the multiple second permanent magnet slots one by one, there will be a first magnetic isolation bridge 30 between the first section 111 and the second magnetic steel slot 12, and there will be a second magnetic isolation bridge 40 between the second section 112 and the second magnetic steel slot 12. At this time, the first magnetic isolation bridge 30 and the second magnetic isolation bridge 40 both include multiple ones. That is to say, compared with the strong and weak magnetic field mixed excitation and the rotor slot structure of the built-in tangential permanent magnet synchronous motor in the prior art, this embodiment increases the number of magnetic isolation bridges. The presence of multiple first magnetic isolation bridges 30 and multiple second magnetic isolation bridges 40 can optimize the magnetic circuit, thereby extending the magnetic field path, and then reducing the leakage magnetic flux of the permanent magnet, thereby improving the utilization rate of the permanent magnet to a certain extent. At the same time, under the condition of the same output torque, the amount of permanent magnet used is reduced, thereby reducing material costs.

[0037] Specifically, when a strong and weak magnetic field hybrid excitation permanent magnet synchronous motor is used, the magnetic properties of the first permanent magnet 21 are greater than the magnetic properties of the second permanent magnet 22; when an internal tangential permanent magnet synchronous motor is used, the magnetic properties of the first permanent magnet 21 are equal to the magnetic properties of the second permanent magnet 22.

[0038] Alternatively, see Figure 1 to Figure 2As shown, the first section 111 in this embodiment extends along the radial direction of the rotor core 10, the first permanent magnet 21 is arranged in the first section 111, the second section 112 is arranged at one end of the first section 111 close to the center of the rotor core 10, and the second section 112 extends along the circumferential direction of the rotor core 10, and a third magnetic isolation bridge 50 is provided between each adjacent two second sections 112. Since there is a first magnetic isolation bridge 30 between the first section 111 and the second magnetic steel slot 12, and there is a second magnetic isolation bridge 40 between the second section 112 and the second magnetic steel slot 12, on this basis, there is a third magnetic isolation bridge 50 between each adjacent two second sections 112 in this embodiment, so that the number of magnetic isolation bridges is further increased, thereby extending the magnetic field path, avoiding the magnetic leakage of the permanent magnet to a certain extent, and effectively improving the utilization rate of the permanent magnet. At the same time, since the first permanent magnet 21 is arranged in the first section 111, and the second section 112 is not provided with a permanent magnet, and the second section 112 extends along the circumferential direction of the rotor core 10, when the motor runs at high speed, the rotor core 10 will generate heat. The existence of the second section 112 increases the passage area of ​​the cooling air of the rotor core 10, which is beneficial to the heat dissipation of the rotor core 10, thereby improving the anti-demagnetization ability of the first permanent magnet 21, thereby ensuring the stability of the motor operation, and extending the service life of the motor to a certain extent.

[0039] Specifically, since the first section 111 extends along the radial direction of the rotor core 10 and the second section 112 extends along the circumferential direction of the rotor core 10, at this time, the first magnetic isolation bridge 30 and the third magnetic isolation bridge 50 extend along the radial direction of the rotor core 10, and the second magnetic isolation bridge 40 extends along the circumferential direction of the rotor core 10.

[0040] Further, see Figures 3 to 7 As shown, the width of the second section 112 along the radial direction of the rotor core 10 in this embodiment gradually decreases from the center of the second section 112 toward the opposite ends of the second section 112. Such an arrangement can effectively ensure the overall structural strength of the rotor core 10 and prevent the rotor core 10 from being deformed or broken due to the centrifugal force when running at a high speed. At the same time, since the second section 112 is an empty slot, the weight of the rotor core 10 can also be reduced, thereby reducing the overall weight of the motor and reducing the manufacturing cost. It should be noted that the width of the second section 112 along the radial direction of the rotor core 10 is Figure 2 Indicated by the letter D1.

[0041] Specifically, see Figure 4 As shown, in an embodiment shown in the present application, both opposite ends of the second section 112 are provided with chamfers 1121, and the chamfers 1121 are located on the side of the second section 112 away from the center of the rotor core 10. At this time, the extension lengths of the second magnetic isolation bridge 40 and the third magnetic isolation bridge 50 are both less than the attached Figure 3The extension length of the second magnetic isolation bridge 40 and the third magnetic isolation bridge 50 shown in FIG. 5; and / or, see Figure 5 As shown in another embodiment shown in the present application, both opposite ends of the second section 112 are provided with chamfers 1121, and the chamfers 1121 are located on one side of the second section 112 close to the center of the rotor core 10. In this case, the extension length of the third magnetic isolation bridge 50 is less than the length of the attached Figure 3 The extension length of the third magnetic isolation bridge 50 is shown in FIG. By changing the extension lengths of different magnetic isolation bridges in this way, the magnetic circuit can be optimized, thereby extending the magnetic field path, and then reducing the magnetic leakage of the permanent magnet, thereby improving the utilization rate of the permanent magnet to a certain extent. At the same time, under the condition of the same output torque, the amount of permanent magnets used is reduced, thereby reducing material costs.

[0042] Specifically, see Figure 6 As shown, in an embodiment shown in the present application, both opposite ends of the second section 112 are provided with rounded corners 1122, and the rounded corners 1122 are located on the side of the second section 112 away from the center of the rotor core 10. At this time, the extension lengths of the second magnetic isolation bridge 40 and the third magnetic isolation bridge 50 are both less than the attached Figure 3 The extension length of the second magnetic isolation bridge 40 and the third magnetic isolation bridge 50 shown in FIG. 5; and / or, see Figure 7 As shown in another embodiment shown in the present application, both opposite ends of the second section 112 are provided with rounded corners 1122, and the rounded corners 1122 are located on the side of the second section 112 close to the center of the rotor core 10. In this case, the extension length of the third magnetic isolation bridge 50 is less than the length of the attached Figure 3 The extension length of the third magnetic isolation bridge 50 is shown in FIG. By changing the extension lengths of different magnetic isolation bridges in this way, the magnetic circuit can be optimized, thereby extending the magnetic field path, and then reducing the magnetic leakage of the permanent magnet, thereby improving the utilization rate of the permanent magnet to a certain extent. At the same time, under the condition of the same output torque, the amount of permanent magnets used is reduced, thereby reducing material costs.

[0043] Further, see Figure 3 As shown, in this embodiment, a first limiting portion 60 is provided at one end of the first segment 111 close to the second segment 112, and the first limiting portion 60 includes two first limiting portions 60, which are provided at opposite sides of the second segment 112 along the circumferential direction of the rotor core 10, and the first permanent magnet 21 abuts against the first limiting portions 60. Specifically, the first limiting portion 60 is a first limiting protrusion 61, and the first limiting protrusion 61 is recessed from the edge of the first segment 111 toward the inner side of the first segment 111.

[0044] Specifically, the first limiting protrusion 61 can not only position the first permanent magnet 21 during assembly, but also fix the first permanent magnet 21. When the motor runs at high speed, it can prevent the first permanent magnet 21 from swinging in the first permanent magnet slot, thereby effectively ensuring the stability of the motor operation.

[0045] Further, see Figure 3 As shown, the second magnetic steel slot 12 in this embodiment extends along the circumferential direction of the rotor core 10, the second magnetic steel slot 12 includes a third section 121 and a fourth section 122, the fourth section 122 includes two, the two fourth sections 122 are arranged on the opposite sides of the third section 121, and the third section 121 and the fourth section 122 are connected, the second permanent magnet 22 is arranged in the third section 121, and a second limiting portion 70 is arranged between the third section 121 and the fourth section 122, the second limiting portion 70 includes at least two, at least two second limiting portions 70 are arranged on the opposite sides of the third section 121 along the circumferential direction of the rotor core 10, and the second permanent magnet 22 abuts against the second limiting portion 70. Since the second permanent magnet 22 is arranged in the third section 121, and the fourth section 122 is not provided with a permanent magnet, and the second magnetic steel slot 12 extends along the circumferential direction of the rotor core 10, when the motor runs at high speed, the rotor core 10 will generate heat. The existence of the fourth section 122 increases the passage area of ​​cooling air of the rotor core 10, which is beneficial to the heat dissipation of the rotor core 10, thereby improving the anti-demagnetization ability of the second permanent magnet 22, thereby ensuring the stability of the motor operation, and extending the service life of the motor to a certain extent.

[0046] It is understandable that the second limiting portion 70 in the present application may include two, three or four. Figure 2 The figure shows a case where there are four second limiting portions 70 .

[0047] Specifically, the second limiting portion 70 in this embodiment is a second limiting protrusion 71, and the second limiting protrusion 71 is recessed from the edge of the fourth section 122 toward the inner side of the fourth section 122. Specifically, the second limiting protrusion 71 can not only position the second permanent magnet 22 during assembly, but also fix the second permanent magnet 22. When the motor runs at a high speed, it can prevent the second permanent magnet 22 from swinging in the second permanent magnet slot, thereby effectively ensuring the stability of the motor operation.

[0048] According to the above description, the rotor assembly of the present application can at least achieve the following technical effects:

[0049] (1) The present application adopts a rotor core structure with multiple magnetic isolation bridges. By increasing the number of magnetic isolation bridges, the magnetic circuit can be optimized, thereby extending the magnetic field path, thereby reducing the magnetic leakage of the permanent magnet, and further improving the utilization rate of the permanent magnet to a certain extent. At the same time, under the condition of the same output torque, the amount of permanent magnets is reduced, thereby reducing the material cost;

[0050] (2) Since the second section in the present application extends along the circumferential direction of the rotor core, the cooling air passing area of ​​the rotor core can be increased. During the high-speed operation of the motor, the existence of the second section and the fourth section is conducive to the heat dissipation of the rotor core, thereby improving the anti-demagnetization ability of the second permanent magnet, thereby ensuring the stability of the motor operation and extending the service life of the motor to a certain extent;

[0051] (3) The two opposite ends of the second section in the present application are both provided with chamfered corners or rounded corners or other shape structures. By changing the length of the magnetic isolation bridge, the magnetic circuit can be optimized, thereby extending the magnetic field path, and then reducing the magnetic leakage of the permanent magnet, thereby improving the utilization rate of the permanent magnet to a certain extent. At the same time, under the condition of the same output torque, the amount of permanent magnet is reduced, thereby reducing the material cost;

[0052] (4) The first limiter can fix the first permanent magnet. When the motor runs at a high speed, it can prevent the first permanent magnet from swinging in the first permanent magnet slot, thereby effectively ensuring the stability of the motor operation.

[0053] (5) The second limiting portion can play a role in positioning the second permanent magnet during assembly and can also play a role in fixing the second permanent magnet. When the motor runs at a high speed, it can prevent the second permanent magnet from swinging in the second permanent magnet slot, thereby effectively ensuring the stability of the motor operation.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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), wherein a plurality of first magnetic steel slots (11) and a plurality of second magnetic steel slots (12) are provided on the rotor core (10), the plurality of first magnetic steel slots (11) and the plurality of second magnetic steel slots (12) are alternately arranged along the circumferential direction of the rotor core (10), the first magnetic steel slot (11) comprises a first section (111) and a second section (112), the first section (111) is connected to the second section (112), a first magnetic isolation bridge (30) is provided between the first section (111) and the second magnetic steel slot (12), and a second magnetic isolation bridge (40) is provided between the second section (112) and the second magnetic steel slot (12); A permanent magnet component (20), the permanent magnet component (20) comprising a plurality of first permanent magnets (21) and a plurality of second permanent magnets (22), the magnetic properties of the first permanent magnets (21) being greater than or equal to the magnetic properties of the second permanent magnets (22), the plurality of first permanent magnets (21) being arranged one-to-one in a plurality of first magnetic steel slots (11), and the plurality of second permanent magnets (22) being arranged one-to-one in a plurality of second magnetic steel slots (12).

2. The rotor assembly according to claim 1, characterized in that The first section (111) extends in the radial direction of the rotor core (10), the first permanent magnet (21) is arranged in the first section (111), the second section (112) is arranged at one end of the first section (111) close to the center of the rotor core (10), and the second section (112) extends in the circumferential direction of the rotor core (10), and a third magnetic isolation bridge (50) is provided between each two adjacent second sections (112).

3. The rotor assembly according to claim 2, characterized in that: The width of the second section (112) along the radial direction of the rotor core (10) gradually decreases from the center of the second section (112) toward two opposite ends of the second section (112).

4. The rotor assembly according to claim 3, characterized in that: Both opposite ends of the second section (112) are provided with chamfered corners (1121), and the chamfered corners (1121) are located on a side of the second section (112) away from the center of the rotor core (10); and / or, The chamfered corners (1121) are provided at both opposite ends of the second section (112), and the chamfered corners (1121) are located on a side of the second section (112) close to the center of the rotor core (10).

5. The rotor assembly according to claim 3, characterized in that: Both opposite ends of the second section (112) are provided with chamfered corners (1122), and the chamfered corners (1122) are located on a side of the second section (112) away from the center of the rotor core (10); and / or, The chamfered corners (1122) are provided at both opposite ends of the second section (112), and the chamfered corners (1122) are located on a side of the second section (112) close to the center of the rotor core (10).

6. The rotor assembly according to claim 1, characterized in that A first limiting portion (60) is provided at one end of the first section (111) close to the second section (112), and the first limiting portion (60) includes two first limiting portions (60). The two first limiting portions (60) are provided on opposite sides of the second section (112) along the circumferential direction of the rotor core (10), and the first permanent magnet (21) abuts against the first limiting portion (60).

7. The rotor assembly according to claim 6, characterized in that The first limiting portion (60) is a first limiting protrusion (61), and the first limiting protrusion (61) is recessed from the edge of the first section (111) toward the inner side of the first section (111).

8. The rotor assembly according to claim 1, characterized in that The second magnetic steel slot (12) extends along the circumferential direction of the rotor core (10), the second magnetic steel slot (12) comprises a third section (121) and a fourth section (122), the fourth section (122) comprises two, the two fourth sections (122) are arranged on two opposite sides of the third section (121), and the third section (121) and the fourth section (122) are connected, the second permanent magnet (22) is arranged in the third section (121), a second limiting portion (70) is arranged between the third section (121) and the fourth section (122), the second limiting portion (70) comprises at least two, at least two second limiting portions (70) are arranged on two opposite sides of the third section (121) along the circumferential direction of the rotor core (10), and the second permanent magnet (22) abuts against the second limiting portion (70).

9. The rotor assembly according to claim 8, characterized in that The second limiting portion (70) is a second limiting protrusion (71), and the second limiting protrusion (71) is recessed from the edge of the fourth section (122) toward the inner side of the fourth section (122).

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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