CN-121984253-A - Hybrid permanent magnet motor with damping holes and stator-rotor auxiliary grooves

Abstract

The invention relates to a hybrid permanent magnet motor with damping holes and stator and rotor auxiliary grooves, which belongs to the technical field of permanent magnet synchronous motors, adopts a VV type built-in rotor structure, designs the damping holes on the rotor structure to reduce torque pulsation and improve output torque, the stator is provided with an auxiliary groove, a damping hole is arranged in the rotor for trimming treatment to reduce the cogging torque of the motor, the permanent magnet is formed by mixing samarium cobalt and neodymium iron boron, and the rotor is arranged in a sectional oblique pole mode. Through multi-objective optimization of a plurality of key structural parameters, a Pareto optimal solution set is obtained by using a non-dominant sorting genetic algorithm (NSGA-II), and further optimization of average torque lifting and torque pulsation suppression of the motor is realized. The motor has excellent anti-demagnetizing capability and high torque density under the high-temperature working condition, and simultaneously, the torque pulsation and harmonic distortion are effectively reduced, so that the motor is suitable for high-performance application occasions such as an electric automobile driving system and the like.

Inventors

• LIN HAN
• LIU HUAWEI
• WANG ZHONGGEN

Assignees

• 安徽理工大学

Dates

Publication Date

20260505

Application Date

20260130

Claims (5)

1. 1. The utility model provides a hybrid permanent magnet motor with shock-absorbing hole and stator and rotor auxiliary groove, its characterized in that includes the rotor, inlays to be established permanent magnet and cover on the rotor are established the stator in the rotor outside, the edge of rotor is provided with inwards oval breach, the stator with the region that oval breach of rotor corresponds is provided with auxiliary groove, the permanent magnet is the double-deck setting of VV, the permanent magnet adopts samarium cobalt and neodymium iron boron mixed arrangement, and wherein first layer permanent magnet is samarium cobalt-neodymium iron boron mixed material, and the second floor permanent magnet is neodymium iron boron material.
2. 2. The hybrid permanent magnet motor with damper holes and stator and rotor auxiliary slots according to claim 1, wherein rectangular damper holes for reducing torque ripple of the motor are provided on the rotor.
3. 3. The hybrid permanent magnet machine with damper holes and stator and rotor auxiliary slots of claim 2, wherein the stator is a flat wire winding structure.
4. 4. A hybrid permanent magnet machine with damper holes and stator and rotor auxiliary slots according to claim 3, characterized in that the rectangular damper holes are used to reduce the torque ripple of the machine according to the following: according to the formula: calculating an average torque of the designed motor, wherein Is electromagnetic torque; is the magnet torque; Is reluctance torque; is the pole pair number of the motor. And simultaneously according to the formula: the torque ripple of the motor is calculated, wherein, For a maximum instantaneous torque value within one electrical cycle, A minimum instantaneous torque value for one electrical cycle; average torque value over one electrical cycle.
5. 5. The hybrid permanent magnet motor with damper holes and stator and rotor auxiliary slots according to claim 4, wherein the VV type double layer of the permanent magnet is provided in an oblique stage arrangement.

Description

Hybrid permanent magnet motor with damping holes and stator-rotor auxiliary grooves Technical Field The invention belongs to the technical field of permanent magnet synchronous motors, and particularly relates to a hybrid permanent magnet motor with damping holes and stator and rotor auxiliary grooves. Background Permanent Magnet Synchronous Motors (PMSMs) have become core actuators of electric car drive systems due to their high power density and high efficiency. With the rapid development of new energy automobile industry, a built-in permanent magnet synchronous motor with longer service life and better comprehensive performance is becoming the main stream direction of technical evolution in the field. In recent years, the industrialization application of the flat wire motor technology further breaks through the power density limit of the traditional motor and promotes the innovation of a thermal management design system. With the rapid development of the electric automobile industry, the performance requirements of the driving motor under the working condition of high temperature and high rotating speed are increasingly improved. The traditional built-in permanent magnet synchronous motor mostly adopts neodymium-iron-boron permanent magnets, which are easy to generate irreversible demagnetization at high temperature, and the reliability of the motor is affected. Although the samarium cobalt permanent magnet has good high-temperature stability, the magnetic energy product is lower, so that the torque density is insufficient. In addition, the motor is easy to generate torque pulsation in operation, and the operation stability and the noise level are affected. The design of the damping hole structure can obviously promote the output torque of the motor and inhibit torque pulsation, but can also increase the cogging torque of the motor. Aiming at the defect that the traditional neodymium-iron-boron permanent magnet is easy to demagnetize irreversibly in a high-temperature environment, the permanent magnet uses samarium cobalt and neodymium-iron-boron mixed materials to give consideration to both performance and stability, and aiming at the problem that a damping hole can increase the cogging torque of a motor, the rotor is subjected to trimming treatment, and the cogging torque is restrained by two methods of designing an auxiliary slot of the stator auxiliary slot. The hybrid VV type built-in rotor topology is provided, auxiliary grooves are formed in a rotor and a stator, and the comprehensive performance of a motor is improved through magnetic performance complementation of samarium cobalt and neodymium iron boron. Disclosure of Invention In order to solve the problems, the invention provides a hybrid permanent magnet motor with damping holes and stator and rotor auxiliary grooves, which has low torque pulsation and cogging torque while maintaining high output torque at high temperature, so as to solve the problems of high demagnetizing risk, high torque pulsation, insufficient torque density and the like at high temperature in the prior art. In order to achieve the above object, the present invention provides the following solutions: The utility model provides a mixed permanent magnet motor with shock-absorbing hole and stator-rotor auxiliary groove, includes the rotor, inlays to be established permanent magnet and cover on the rotor are established the stator in the rotor outside, the edge of rotor is provided with inwards oval breach, the stator with the region that oval breach of rotor corresponds is provided with auxiliary groove, the permanent magnet is the double-deck setting of VV, the permanent magnet adopts samarium cobalt and neodymium iron boron mixed arrangement, and wherein first layer permanent magnet is samarium cobalt-neodymium iron boron mixed material, and the second floor permanent magnet is neodymium iron boron material. Preferably, the rotor is provided with rectangular damper holes for reducing torque pulsation of the motor. Preferably, the stator is a flat wire winding structure. Preferably, the rectangular damper hole is used for reducing torque pulsation of the motor according to the following: according to the formula: calculating an average torque of the designed motor, wherein Is electromagnetic torque; is the magnet torque; Is reluctance torque; is the pole pair number of the motor. And simultaneously according to the formula: the torque ripple of the motor is calculated, wherein, For a maximum instantaneous torque value within one electrical cycle,A minimum instantaneous torque value for one electrical cycle; average torque value over one electrical cycle. Preferably, the VV type double layer of the permanent magnet is arranged in an inclined stage. Compared with the prior art, the invention has the following technical effects: The invention adopts a samarium cobalt and neodymium iron boron mixed permanent magnet layout, not only utilizes the high temperature stability and