Rotor core, motor, and compressor

Abstract

The application provides a rotor core, a motor and a compressor. The rotor core comprises a core body, the core body has a plurality of first magnetic steel grooves and a plurality of second magnetic steel grooves, and the plurality of first magnetic steel grooves and the plurality of second magnetic steel grooves are alternately distributed in the circumferential direction of the core body. The first magnetic steel groove and the second magnetic steel groove are both V-shaped structures, the V-shaped included angle of the first magnetic steel groove is c1, the V-shaped included angle of the second magnetic steel groove is c2, and c1 < c2. In the scheme, the adjacent magnetic steel grooves in the rotor core are arranged as asymmetric structures, so that the included angle parameters of the two adjacent pole magnetic steel grooves are different. In use, the easy demagnetization area is slightly increased from the reverse magnetic field of the stator, so that the effect of the reverse demagnetization magnetic field on the easy demagnetization area is slowed down, and the local demagnetization of the rotor under high-frequency working conditions is reduced. Thus, the direction of the magnetic circuit can be changed, the overall motor structure can be optimized, the cogging torque can be inhibited, the stability of the motor under high-frequency operation can be improved, the torque constant can be controlled, and the overall performance of the motor can be improved.

Description

Technical Field

[0001] This invention relates to the field of motor rotor technology, and more specifically, to a rotor core, a motor, and a compressor. Background Technology

[0002] Rotary compressors are the most commonly used type of compressor in household air conditioners, with the motor being the core structure. The distribution of the rotor magnetic circuit within the motor significantly impacts its overall performance. Currently, the V-shaped magnet slot structure is a widely adopted new rotor core structure. Compared to the traditional straight-slot magnet rotor, it offers higher power density, which is beneficial for improving motor performance. However, during motor operation, due to the presence of cogging torque and the constraints of the magnetic circuit, issues such as low torque constant, unstable operation, and high noise levels may occur. Therefore, it is necessary to optimize the magnet slot structure to improve the stability of motor operation and thus enhance performance. Summary of the Invention

[0003] This invention provides a rotor core, a motor, and a compressor to optimize the magnetic circuit of the rotor core and improve motor performance.

[0004] To achieve the above objectives, according to one aspect of the present invention, a rotor core is provided, comprising a core body having a plurality of first magnet slots and a plurality of second magnet slots, the plurality of first magnet slots and the plurality of second magnet slots being alternately distributed circumferentially in the core body; both the first magnet slots and the second magnet slots are V-shaped structures, the included angle of the V-shape of the first magnet slot is c1, the included angle of the V-shape of the second magnet slot is c2, and c1 < c2.

[0005] Furthermore, 150° < c1 < 160°, 150° < c2 < 160°.

[0006] Furthermore, the first magnetic groove has two first magnetic isolation holes on the side away from the center of the iron core body, and the second magnetic groove has two second magnetic isolation holes on the side away from the center of the iron core body. The angle formed by the line connecting the center of the two first magnetic isolation holes and the center of the iron core body is a1, and the angle formed by the line connecting the center of the two second magnetic isolation holes and the center of the iron core body is a2, where a1>2a2.

[0007] Furthermore, the first magnet slot includes two interconnected first slots, which are symmetrically arranged with respect to the plane passing through the center of the iron core body; the second magnet slot includes two interconnected second slots, which are symmetrically arranged with respect to the plane passing through the center of the iron core body.

[0008] Furthermore, the first groove has a first groove segment for inserting a magnet, the length of the first groove segment is b1, and the two first groove segments of the first magnet groove are interconnected; the second groove has a second groove segment for inserting a magnet, the length of the second groove segment is b2, and the two second groove segments of the second magnet groove are interconnected; wherein, b2 > b1.

[0009] Furthermore, 0.4mm <b2-b1<0.6mm。

[0010] Furthermore, the first groove body also has a third groove segment connected to the first groove segment. The two first groove segments of the first magnet groove are located between the two third groove segments of the first magnet groove. The inner wall of the third groove segment near the center of the iron core body and the inner wall of the first groove segment near the center of the iron core body form a first thrust step. The first thrust step is used to limit the magnet in the first groove segment. The length of the inner wall of the third groove segment near the center of the iron core body is e1. The second groove body also has a fourth groove segment connected to the second groove segment. The two second groove segments of the second magnet groove are located between the two fourth groove segments of the second magnet groove. The inner wall of the fourth groove segment near the center of the iron core body and the inner wall of the second groove segment near the center of the iron core body form a second thrust step. The second thrust step is used to limit the magnet in the second groove segment. The length of the inner wall of the fourth groove segment near the center of the iron core body is e2. Wherein, e1 > e2.

[0011] Furthermore, e1 > 2e2.

[0012] Furthermore, in the radial direction of the iron core body, the end dimension of the first magnetic groove is d1, and the end dimension of the second magnetic groove is d2, where d2>d1.

[0013] Furthermore, d1 < 0.5 mm, d2 > 1 mm.

[0014] According to another aspect of the present invention, an electric motor is provided, the motor comprising the rotor core described above.

[0015] According to another aspect of the present invention, a compressor is provided, the compressor comprising the aforementioned rotor core.

[0016] The present invention provides a rotor core comprising a core body having multiple first magnetic slots and multiple second magnetic slots, which are alternately distributed circumferentially on the core body. Both the first and second magnetic slots are V-shaped structures, with the V-angle of the first magnetic slot being c1 and the V-angle of the second magnetic slot being c2, where c1 < c2. In this solution, adjacent magnetic slots in the rotor core are configured as asymmetrical structures, resulting in different parameters such as the included angle between adjacent magnetic slots. Compared to existing solutions using identical magnetic slots, this solution, due to the smaller V-angle of the first magnetic slot, slightly increases the distance between the easily demagnetized area and the stator's reverse magnetic field during use. This mitigates the effect of the reverse demagnetizing magnetic field on the easily demagnetized area, thereby reducing local demagnetization of the rotor under high-frequency conditions. This alters the magnetic circuit orientation, effectively optimizes the overall motor structure, suppresses cogging torque, and improves the stability of the motor during high-frequency operation, controlling the torque constant and enhancing the overall performance of the motor. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of the rotor core provided in an embodiment of the present invention is shown;

[0019] Figure 2 It shows Figure 1 An enlarged view of the rotor core at the position of the first magnet slot;

[0020] Figure 3 It shows Figure 1 An enlarged view of the rotor core at the position of the second magnet slot.

[0021] The above figures include the following reference numerals:

[0022] 10. Core body; 11. First magnetic isolation hole; 12. Second magnetic isolation hole;

[0023] 20. First magnetic steel trough; 21. First trough body; 211. First trough segment; 212. Third trough segment;

[0024] 30. Second magnetic steel trough; 31. Second trough body; 311. Second trough section; 312. Fourth trough section. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] like Figures 1 to 3 As shown, an embodiment of the present invention provides a rotor core, including a core body 10. The core body 10 has a plurality of first magnet slots 20 and a plurality of second magnet slots 30, which are alternately distributed circumferentially in the core body 10. Both the first magnet slots 20 and the second magnet slots 30 are V-shaped structures, with the included angle of the V-shape of the first magnet slot 20 being c1 and the included angle of the V-shape of the second magnet slot 30 being c2, where c1 < c2.

[0027] In this scheme, the adjacent magnet slots in the rotor core are set as an asymmetrical structure, which makes the parameters such as the included angle between adjacent magnet slots different. Compared with the existing scheme that uses identical magnet slots, the V-shaped included angle of the first magnet slot 20 is smaller in this scheme. During use, the distance between the easily demagnetized area and the reverse magnetic field of the stator is slightly increased, thereby reducing the effect of the reverse demagnetizing magnetic field on the easily demagnetized area. This reduces the local demagnetization of the rotor under high-frequency conditions, thereby changing the direction of the magnetic circuit, effectively optimizing the overall motor structure, suppressing cogging torque, and thus improving the stability of the motor during high-frequency operation, controlling the torque constant, and improving the overall performance of the motor.

[0028] In this embodiment, 150° < c1 < 160°, 150° < c2 < 160°. Setting the V-angle of the first magnet slot 20 and the V-angle of the second magnet slot 30 within the above range allows the motor to have a higher power density.

[0029] like Figure 1 As shown, the first magnetic slot 20 has two first magnetic isolation holes 11 on the side away from the center of the iron core body 10, and the second magnetic slot 30 has two second magnetic isolation holes 12 on the side away from the center of the iron core body 10. The angle formed by the line connecting the center of the two first magnetic isolation holes 11 to the center of the iron core body 10 is a1, and the angle formed by the line connecting the center of the two second magnetic isolation holes 12 to the center of the iron core body 10 is a2, where a1 > 2a2. Thus, the positions of the magnetic isolation holes in adjacent first magnetic slots 20 and second magnetic slots 30 are different and asymmetrical, making it easier to change the magnetic circuit direction and improve motor performance.

[0030] In this embodiment, the first magnetic steel grooves 20 comprise two first groove bodies 21 that communicate with each other, and the two first groove bodies 21 are symmetrically arranged relative to a plane passing through the center of the iron core main body 10; the second magnetic steel grooves 30 comprise two second groove bodies 31 that communicate with each other, and the two second groove bodies 31 are symmetrically arranged relative to a plane passing through the center of the iron core main body 10. The symmetrical structure facilitates the processing of the magnetic steel grooves.

[0031] Wherein, the first groove body 21 has a first groove segment 211 for the magnetic steel to penetrate into, the length of the first groove segment 211 is b1, and the two first groove segments 211 of the first magnetic steel groove 20 communicate with each other; the second groove body 31 has a second groove segment 311 for the magnetic steel to penetrate into, the length of the second groove segment 311 is b2, and the two second groove segments 311 of the second magnetic steel groove 30 communicate with each other; wherein, b2 > b1. Through the above arrangement, the length of the magnetic steel penetrated into the first groove segment 211 is shorter than that of the magnetic steel penetrated into the second groove segment 311, which can reduce the dosage of magnetic steel and optimize the magnetic circuit.

[0032] Specifically, 0.4mm < b2-b1 < 0.6mm. This dimensional constraint can achieve the purpose of reducing the dosage of magnetic steel without changing the size of the rotor core and the shape of the magnetic steel grooves, which helps reduce the cost of the motor.

[0033] As shown in Figure 2 and Figure 3 , the first groove body 21 further has a third groove segment 212 communicating with the first groove segment 211, the two first groove segments 211 of the first magnetic steel groove 20 are located between the two third groove segments 212 of the first magnetic steel groove 20, the inner wall of the third groove segment 212 close to the center of the iron core main body and the inner wall of the first groove segment 211 close to the center of the iron core main body form a first thrust stop, the first thrust stop is used for limiting the position of the magnetic steel in the first groove segment 211, and the length of the inner wall of the third groove segment 212 close to the center of the iron core main body is e1; the second groove body 31 further has a fourth groove segment 312 communicating with the second groove segment 311, the two second groove segments 311 of the second magnetic steel groove 30 are located between the two fourth groove segments 312 of the second magnetic steel groove 30, the inner wall of the fourth groove segment 312 close to the center of the iron core main body and the inner wall of the second groove segment 311 close to the center of the iron core main body form a second thrust stop, the second thrust stop is used for limiting the position of the magnetic steel in the second groove segment 311, and the length of the inner wall of the fourth groove segment 312 close to the center of the iron core main body is e2; wherein, e1 > e2.

[0034] With the above design, the position of the magnetic steel in the first groove segment 211 can be limited through the contact between the first thrust stop and the magnetic steel in the first groove segment 211, and the position of the magnetic steel in the second groove segment 311 can be limited through the contact between the second thrust stop and the magnetic steel in the second groove segment 311.

[0035] Specifically, e1 > 2e2. This is more conducive to optimizing the magnetic circuit and can control motor leakage flux and avoid geometric interference.

[0036] like Figure 2 and Figure 3 As shown, in the radial direction of the iron core body 10, the end dimension of the first magnet slot 20 is d1, and the end dimension of the second magnet slot 30 is d2, where d2 > d1. To reduce magnetic leakage at the end of the permanent magnet, a magnetic isolation bridge is designed at the end of the magnet slot. However, an excessively wide magnetic isolation bridge can also increase rotor magnetic leakage. Furthermore, the shape of the magnet slot is constrained by factors such as the magnetic isolation bridge, the included angle of the magnet slots, and their length. Therefore, to control motor magnetic leakage and avoid geometric interference, the end dimensions of the two magnet slots are set to d2 > d1. Specifically, d1 < 0.5 mm, and d2 > 1 mm.

[0037] Another embodiment of the present invention provides an electric motor, which includes the rotor core described above. In this solution, adjacent magnet slots in the rotor core are configured as an asymmetrical structure, resulting in different parameters such as the included angle between adjacent magnet slots. Compared with existing solutions that use identical magnet slots, this solution has a smaller V-angle in the first magnet slot 20, which slightly increases the distance between the easily demagnetized area and the reverse magnetic field of the stator during use. This reduces the effect of the reverse demagnetizing magnetic field on the easily demagnetized area, thereby reducing local demagnetization of the rotor under high-frequency operating conditions. This can change the direction of the magnetic circuit, effectively optimize the overall motor structure, suppress cogging torque, and thus improve the stability of the motor during high-frequency operation, control the torque constant, and improve the overall performance of the motor.

[0038] The present invention also provides a compressor comprising the aforementioned rotor core. It should be noted that any modifications made to the motor within the scope of the present invention, such as changing the core stack height or the grade of the magnets, are within the protection scope of the present invention.

[0039] This invention optimizes the magnet slots into an asymmetrical structure, making the positions of the magnetic isolation holes and the included angle of the magnet slots different for adjacent poles. This changes the direction of the magnetic circuit, effectively optimizes the overall motor structure, suppresses cogging torque, and thus improves the stability of the motor during high-frequency operation, controls the torque constant, and improves the overall performance of the motor. Compared with existing solutions, it reduces the amount of magnets used and lowers costs.

[0040] Furthermore, this invention only optimizes the structure of the magnetic steel groove and the magnetic isolation hole, without adding new structures such as slot holes or air gap holes to the magnetic steel groove, making it easy to implement.

[0041] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0044] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0045] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0046] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

Claims

1. A rotor core, characterized in that, The system includes a core body (10), which has a plurality of first magnetic slots (20) and a plurality of second magnetic slots (30). The plurality of first magnetic slots (20) and the plurality of second magnetic slots (30) are alternately distributed circumferentially on the core body (10). The first magnetic slots (20) and the second magnetic slots (30) are both V-shaped structures. The included angle of the V-shape of the first magnetic slot (20) is c1, and the included angle of the V-shape of the second magnetic slot (30) is c2, where c1 < c2, 150° < c1 < 160°, and 150° < c2 < 160°. The first magnetic groove (20) has two first magnetic isolation holes (11) on the side away from the center of the iron core body (10), and the second magnetic groove (30) has two second magnetic isolation holes (12) on the side away from the center of the iron core body (10). The angle formed by the line connecting the center of the two first magnetic isolation holes (11) and the center of the iron core body (10) is a1, and the angle formed by the line connecting the center of the two second magnetic isolation holes (12) and the center of the iron core body (10) is a2, where a1>2a2; In the radial direction of the iron core body (10), the end dimension of the first magnet groove (20) is d1, and the end dimension of the second magnet groove (30) is d2, d2>d1, wherein d1<0.5 mm and d2>1 mm.

2. The rotor core according to claim 1, characterized in that, The first magnet slot (20) includes two interconnected first slots (21), which are symmetrically arranged with respect to the plane passing through the center of the iron core body (10); the second magnet slot (30) includes two interconnected second slots (31), which are symmetrically arranged with respect to the plane passing through the center of the iron core body (10).

3. The rotor core according to claim 2, characterized in that, The first groove (21) has a first groove segment (211) for inserting a magnet, the length of the first groove segment (211) is b1, and the two first groove segments (211) of the first magnet groove (20) are interconnected; the second groove (31) has a second groove segment (311) for inserting a magnet, the length of the second groove segment (311) is b2, and the two second groove segments (311) of the second magnet groove (30) are interconnected; wherein, b2 > b1.

4. The rotor core according to claim 3, characterized in that, 0.4mm <b2-b1<0.6mm。 5. The rotor core according to claim 3, characterized in that, The first groove (21) also has a third groove (212) that communicates with the first groove segment (211). The two first groove segments (211) of the first magnet groove (20) are located between the two third groove segments (212) of the first magnet groove (20). The inner wall of the third groove segment (212) near the center of the iron core body (10) and the inner wall of the first groove segment (211) near the center of the iron core body (10) form a first thrust step. The first thrust step is used to limit the magnet in the first groove segment (211). The length of the inner wall of the third groove segment (212) near the center of the iron core body (10) is e1. The second groove (31) also has a fourth groove (312) that communicates with the second groove segment (311). The two second groove segments (311) of the second magnet groove (30) are located between the two fourth groove segments (312) of the second magnet groove (30). The inner wall of the fourth groove segment (312) near the center of the iron core body (10) and the inner wall of the second groove segment (311) near the center of the iron core body (10) form a second thrust step. The second thrust step is used to limit the magnet in the second groove segment (311). The length of the inner wall of the fourth groove segment (312) near the center of the iron core body (10) is e2. Where e1 > e2.

6. The rotor core according to claim 5, characterized in that, e1 > 2e2.

7. An electric motor, characterized in that, The motor includes the rotor core as described in any one of claims 1 to 6.

8. A compressor, characterized in that, The compressor includes the rotor core as described in any one of claims 1 to 6.

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