Asynchronous motor rotor punching sheet structure and motor
By designing the concave surface at the other end of the through groove of the asynchronous motor rotor body, the magnetic circuit saturation and magnetic leakage problems caused by the rotor punching groove position are solved, and the NVH problem in the low-speed and low-torque zone is further reduced.
Patent Information
- Application Number
- CN202421459445.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-24
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-06-24
AI Technical Summary
The existing asynchronous motor rotor punching slot position design is equally wide, resulting in saturation of the magnetic circuit, stimulating the critical-order electromagnetic force, increasing magnetic leakage, and NVH problems in the low-speed and low-torque zone.
Design a concave surface at the other end of the through groove of the rotor body, perform special shape design, freely adjust the rotor punch yoke, increase the optimization range of the rotor punch structure, and design the unequal width of the through groove position to reduce magnetic circuit saturation and magnetic leakage, and reduce harmonics.
By designing the concave surface, the degree of magnetic circuit saturation and magnetic leakage are reduced, torque fluctuations and electromagnetic force are reduced, and the NVH problem in the low-speed and low-torque zone is significantly reduced.
Smart Images
Figure CN222928146U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of rotor punching sheets, and particularly to a structure of a rotor punching sheet of an asynchronous motor and the motor. Background Art
[0002] In the prior art, for the rotor punching sheet of an asynchronous motor, generally, the number of rotor slots is determined according to the number of poles of the motor and the number of stator slots first, and then the key dimensions such as the slot opening Bs0, slot position Hs0, slot height Hs2, tooth width t of the rotor punching sheet are adjusted for the optimal design of torque, torque ripple and electromagnetic force. When the slot positions of the rotor punching sheet are designed with equal width, the magnetic circuit is likely to reach saturation, exciting the electromagnetic force of key orders and increasing the leakage magnetic flux. Summary of the Utility Model
[0003] The purpose of the utility model is to provide a structure of a rotor punching sheet of an asynchronous motor and the motor, which solves the problems that when the slot positions of the rotor punching sheet are designed with equal width, the magnetic circuit is likely to reach saturation, exciting the electromagnetic force of key orders and increasing the leakage magnetic flux.
[0004] To achieve the above purpose, on the one hand, the utility model provides a structure of a rotor punching sheet of an asynchronous motor. The rotor punching sheet structure includes a rotor body, and a through groove is arranged on the rotor body. The through groove is distributed along the radial direction of the rotor. The width of one end of the through groove close to the center of the rotor body is smaller than that of the other end, and a concave surface is arranged at the other end of the through groove.
[0005] Optionally, the through grooves are uniformly distributed on the rotor body.
[0006] Optionally, the opening at the other end of the through groove is closed.
[0007] Optionally, the number of concave surfaces at the other end of the through groove is at least one.
[0008] Optionally, the number of through grooves is 69.
[0009] On the other hand, the utility model further includes an asynchronous motor, and the asynchronous motor includes:
[0010] A stator body;
[0011] A rotor punching sheet structure, the rotor punching sheet structure includes a rotor body, and a through groove is arranged on the rotor body. The through groove is distributed along the radial direction of the rotor. The width of one end of the through groove close to the center of the rotor body is smaller than that of the other end, and a concave surface is arranged at the other end of the through groove.
[0012] Optionally, the through grooves are uniformly distributed on the rotor body.
[0013] Optionally, the opening at the other end of the through groove is closed.
[0014] Optionally, the number of concave surfaces at the other end of the through groove is at least one.
[0015] Optionally, the number of the through grooves is 69, the number of the through grooves of the stator body is 54, and the number of poles of the asynchronous motor is 6 poles.
[0016] Through the above technical solution, when the cooperation of the stator through groove, the rotor through groove and the number of motor poles is determined, by designing a concave surface at the other end of the through groove of the rotor body, the problems of torque fluctuation, unobvious optimization degree of electromagnetic force and NVH existing in the low-speed and low-torque region in the prior art can be solved; the concave surface is a special-shaped design of the through groove of the rotor body, and the yoke part of the rotor punching can be freely adjusted, the optimization range of the rotor punching structure is increased, and the through groove position of the rotor punching structure is designed with unequal widths, which can reduce the magnetic circuit saturation degree and magnetic leakage, reduce harmonics, further reduce torque fluctuation and electromagnetic force, and solve the NVH problem existing in the low-speed and low-torque region. Description of the Drawings
[0017] The drawings are used to provide a further understanding of the embodiments of the present invention, and constitute a part of the specification, and are used to explain the embodiments of the present invention together with the following specific embodiments, but do not constitute a limitation to the embodiments of the present invention. In the drawings:
[0018] Figure 1 is the first concave surface through groove schematic diagram of a rotor punching structure of an asynchronous motor according to an embodiment of the present invention;
[0019] Figure 2 is the first concave surface through groove partial enlarged view of a rotor punching structure of an asynchronous motor according to an embodiment of the present invention;
[0020] Figure 3 is the second concave surface through groove schematic diagram of a rotor punching structure of an asynchronous motor according to an embodiment of the present invention;
[0021] Figure 4 is the second concave surface through groove partial enlarged view of a rotor punching structure of an asynchronous motor according to an embodiment of the present invention;
[0022] Figure 5 is the schematic diagram of a rotor punching structure of an asynchronous motor in the prior art;
[0023] Figure 6 is the simulation comparison diagram of the torque fluctuation of a rotor punching structure of an asynchronous motor according to an embodiment of the present invention;
[0024] Figure 7It is an electromagnetic force simulation comparison diagram of the rotor punching sheet structure of an asynchronous motor according to an embodiment of the present utility model.
[0025] Explanation of reference numerals
[0026] 1. Rotor body 2. Through groove
[0027] 3. Concave surface Hs0. Position of the through groove
[0028] t. Distance between each through groove Hs1. Position of the concave surface
[0029] Hs2. Height of the through groove Specific embodiments
[0030] The following will describe in detail the specific embodiments of the embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the embodiments of the present utility model, and are not used to limit the embodiments of the present utility model.
[0031] In the embodiments of the present application, unless otherwise stated, the orientation terms such as "upper, lower, top, bottom" are usually in the direction shown in the drawings or in the vertical, perpendicular or gravitational directions for describing the relative positional relationship of each component.
[0032] In addition, if there is a description involving "first", "second", etc. in the embodiments of the present application, the description of "first", "second", etc. is only for descriptive purposes, and cannot be understood as indicating or implying its relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present application.
[0033] As Figure 1 shown, Figure 1 is the first schematic diagram of the concave surface through groove of the rotor punching sheet structure of an asynchronous motor according to an embodiment of the present utility model. In this Figure 1As can be seen, the rotor punching sheet structure includes a rotor body 1. A through groove 2 is provided on the rotor body 1. The through groove 2 is distributed along the radial direction of the rotor. The width of one end of the through groove 2 close to the center of the rotor body 1 is smaller than that of the other end. A concave surface 3 is provided at the other end of the through groove 2. In the prior art, for the asynchronous motor rotor punching sheet structure, generally, the number of through grooves 2 of the rotor body needs to be determined by first determining the number of motor poles and the number of stator slots, and then optimizing the design of torque, torque ripple, and electromagnetic force by adjusting dimensions such as the height of the through groove 2, the width between adjacent through grooves 2, the position of the through groove 2, and the through groove opening. However, due to the equal-width design of the position of the through groove 2 of the rotor body 1, the magnetic force is easily saturated, which can excite the electromagnetic force of the key orders, resulting in an increase in magnetic leakage. In an embodiment of the present invention, when the stator through groove, the rotor through groove, and the number of motor poles are coordinated and determined, by designing a concave surface at the other end of the through groove 2 of the rotor body 1, the problems of torque ripple and electromagnetic force optimization not being obvious in the prior art and the NVH problems existing in the low-speed and low-torque region can be solved; the concave surface can perform a special-shaped design on the through groove 2 of the rotor body 1, freely adjust the yoke part of the rotor punching sheet, increase the optimization range of the rotor punching sheet structure, perform an unequal-width design on the position of the through groove 2 of the rotor punching sheet structure, reduce the degree of magnetic circuit saturation and magnetic leakage, reduce harmonics, further reduce torque ripple and electromagnetic force, and solve the NVH problems existing in the low-speed and low-torque region.
[0034] In this embodiment, for the positional relationship between the through groove 2 and the rotor body 1, there are various types known to those skilled in the art. In an embodiment of the present invention, the through grooves 2 are evenly distributed on the rotor body 1.
[0035] In this embodiment, to reduce the torque pulsation caused by the opening of the rotor punching sheet groove, the opening at the other end of the through groove 2 is closed, and the through groove 2 is a closed groove.
[0036] In this embodiment, for the number of concave surfaces 3, there are multiple numbers known to those skilled in the art. In an embodiment of the present invention, as Figure 1 shown, the number of concave surfaces 3 is 1, which is the first type of concave surface through groove; as Figure 2 shown, the number of concave surfaces 3 is two, which is the second type of concave surface through groove.
[0037] In this embodiment, the height Hs2 of the through groove 2 of the rotor punching sheet structure is positively correlated with the torque of the motor. As the height Hs2 of the through groove 2 increases, the torque of the motor also increases, and the current density of the rotor body 1 decreases. When the space of the rotor punching sheet structure permits, the position Hs1 of the concave surface can be increased. After simulation verification, in the low-speed and low-torque region, the simulation results show that the torque ripple slightly increases with the addition of the concave surface design, the amplitude of the key-order electromagnetic force decreases by 20%, and the noise amplitude decreases by 5 - 10 dB, which can further reduce the electromagnetic force and solve the NVH problems existing in the low-speed and low-torque region.
[0038] In this embodiment, the number of through slots can be multiple known to those skilled in the art. In an embodiment of the present utility model, the number of through slots is 69.
[0039] In addition, the present utility model further includes an asynchronous motor, which includes a stator body and a rotor body 1. A through slot 2 is provided on the rotor body 1, and the through slot 2 is distributed along the radial direction of the rotor. The width of one end of the through slot 2 close to the center of the rotor body 1 is smaller than that of the other end, and a concave surface 3 is provided at the other end of the through slot 2. In the prior art, for the structure of the asynchronous motor rotor punching sheet, generally, the number of poles of the motor and the number of stator slots need to be determined first to determine the number of through slots 2 of the rotor body, and then the dimensions such as the height of the through slot 2, the width between adjacent through slots 2, the position of the through slot 2, and the through slot opening are adjusted for the optimization design of torque, torque ripple, and electromagnetic force. However, with the equal-width design of the position of the through slot 2 of the rotor body 1, the magnetic force is likely to reach a saturated state, which can excite the electromagnetic force of key orders, resulting in an increase in magnetic leakage. In an embodiment of the present utility model, when the stator through slot, the rotor through slot, and the number of poles of the motor are determined in cooperation, by designing a concave surface at the other end of the through slot 2 of the rotor body 1, the problems of torque ripple and unobvious optimization degree of electromagnetic force in the prior art and the NVH problem in the low-speed and low-torque region can be solved; the concave surface can perform a special-shaped design on the through slot 2 of the rotor body 1, and can freely adjust the yoke part of the rotor punching sheet, increasing the optimization range of the rotor punching sheet structure. By performing an unequal-width design on the position of the through slot 2 of the rotor punching sheet structure, the degree of magnetic circuit saturation and magnetic leakage can be reduced, harmonics can be reduced, and torque ripple and electromagnetic force can be further reduced, solving the NVH problem in the low-speed and low-torque region.
[0040] In this embodiment, the number of through slots 2 is 69, the number of through slots of the stator body is 54, and the number of poles of the asynchronous motor is 6 poles. As Figure 6 shown, by comparing the through slot of the rotor body 1 in the prior art with the first concave surface through slot and the second concave surface through slot, the torque and torque ripple levels are comparable and the fluctuations are not significant. As Figure 7As shown in the figure, through the electromagnetic force simulation comparison of the through slot of the rotor body 1 in the prior art with the first concave through slot and the second concave through slot, it can be seen that the electromagnetic force results of the through slot in the prior art show large fluctuations in the amplitudes of each order, and the 57th-order electromagnetic force is prominent, which has a great impact on NVH. The electromagnetic force amplitude of the first concave through slot design changes smoothly, and the 57th-order electromagnetic force is significantly reduced. The electromagnetic force amplitude of the second concave through slot design changes smoothly, the 57th-order electromagnetic force is significantly reduced, and the 69th-order electromagnetic force is also reduced. The height Hs2 of the through slot 2 of the rotor punching structure is positively correlated with the torque of the motor. As the height Hs2 of the through slot 2 increases, the torque of the motor also increases, and the current density of the rotor body 1 decreases. When the space of the rotor punching structure permits, the position Hs1 of the concave surface can be increased. After simulation verification, the simulation results in the low-speed and low-torque region show that the torque fluctuation of the concave surface design increases slightly, the electromagnetic force amplitude of the key order is reduced by 20%, and the noise amplitude is reduced by 5 - 10 dB, which can further reduce the electromagnetic force and solve the NVH problem in the low-speed and low-torque region.
[0041] Through the above technical solutions, when the cooperation of the stator through slot, the rotor through slot and the number of motor poles is determined, by designing a concave surface at the other end of the through slot 2 of the rotor body 1, the problems of torque fluctuation, unobvious optimization degree of electromagnetic force and NVH in the low-speed and low-torque region in the prior art can be solved; this concave surface can perform special-shaped design on the through slot 2 of the rotor body 1, freely adjust the yoke part of the rotor punching, increase the optimization range of the rotor punching structure, perform unequal-width design on the position of the through slot 2 of the rotor punching structure, reduce the magnetic circuit saturation degree and magnetic leakage, reduce harmonics, further reduce the torque fluctuation and electromagnetic force, and solve the NVH problem in the low-speed and low-torque region.
[0042] The above has described in detail the optional implementation manners of the embodiments of the present invention in conjunction with the drawings. However, the implementation manners of the present invention are not limited to the specific details in the above implementation manners. Within the scope of the technical concept of the implementation manners of the present invention, various simple modifications can be made to the technical solutions of the implementation manners of the present invention, and these simple modifications all belong to the protection scope of the implementation manners of the present invention.
[0043] In addition, it should be noted that, in the various specific technical features described in the above specific implementation manners, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the embodiments of the present invention will not separately describe various possible combination manners.
[0044] In addition, any combination can be made between various different implementation manners of the embodiments of the present invention, as long as it does not violate the idea of the implementation manners of the present invention, it should also be regarded as the content disclosed by the implementation manners of the present invention.
Claims
1. An asynchronous motor rotor punching structure, characterized in that: The rotor punching structure includes a rotor body, which is provided with a through slot. The through slot is distributed along the radial direction of the rotor, the width of one end of the through slot close to the center of the rotor body is smaller than the width of the other end, and the other end of the through slot is provided with a concave surface.
2. The rotor punching structure according to claim 1, characterized in that: The through slots are evenly distributed on the rotor body.
3. The rotor punching structure according to claim 1, characterized in that: The opening at the other end of the through slot is closed.
4. The rotor punching structure according to claim 1, characterized in that: The number of the concave surface at the other end of the through slot is at least one.
5. The rotor punching structure according to claim 1, characterized in that: The number of the through slots is 69.
6. An asynchronous motor, characterized in that: The asynchronous motor comprises: stator body; A rotor punching structure, the rotor punching structure includes a rotor body, the rotor body is provided with a through slot, the through slot is distributed along the radial direction of the rotor, the width of one end of the through slot close to the center of the rotor body is smaller than the width of the other end, and the other end of the through slot is provided with a concave surface.
7. The asynchronous motor according to claim 6, characterized in that: The through slots are evenly distributed on the rotor body.
8. The asynchronous motor according to claim 6, characterized in that: The opening at the other end of the through slot is closed.
9. The asynchronous motor according to claim 6, characterized in that: The number of the concave surface at the other end of the through slot is at least one.
10. The asynchronous motor according to claim 6, characterized in that The number of the through slots is 69, the number of the through slots of the stator body is 54, and the number of poles of the asynchronous motor is 6.