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标题：一种降低内嵌式永磁电机磁钢损耗的新方法 |
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作者：王晓远，谢宇，王耕籍 |
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| 2016年第11期 访问次数：344次 |
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摘要：高速永磁同步电机以其体积小、效率高、功率密度大等优点，广泛应用于飞轮储能系统。电机温升直接影响到电机的性能与可靠性，而在高速电机中，由于定子电流时间谐波和气隙磁场中的高次空间谐波产生的永磁体涡流损耗变得不可忽略，其损耗积累导致的温升会对永磁体性能产生较大影响。考虑到本电机转子内嵌式永磁体结构，无需采用护套，及永磁体表面镀层工艺对镀层厚度的限制，本文采用了永磁体表面覆铜板的方式加入高电导率蔽层以减小永磁体损耗，优化了电机温升，使转子稳态温度降低了306%。本文以一台4极，150kW,9000r/min的永磁电机为例，建立二维有限元模型，通过有限元计算分析了电机空载状态下的损耗与温升，并通过实验验证了模型与仿真结果的正确性。
关键词：飞轮储能系统；高速永磁同步电机；温度；薄铜板
Abstract: With the advantages of small size, high efficiency and high power density, highspeed permanent magnet synchronous motor (PMSM) can be applied to the flywheel energy storage system (FESS). The temperature of the motor directly affects the performance and reliability of the motor. In high speed motor, permanent magnet eddy current losses created by high order harmonic in stator current and air gap magnetic field cannot be ignored. The temperature rised by the accumulation of losses will have a greater impact on the performance of permanent magnets. Considering the structure of the rotor of interior PMSM, sleeve is not necessary and the coating on the surface of permanent magnet is not thick enough, so a thin copper plate is covered on the surface of the permanent magnet to reduce the eddy current loss of permanent magnet. With the temperature rise optimized, the rotor stable temperature is reduced by 306%.In this paper, the twodimensional finite element model of 150 kW, 9000 r/min permanent magnet motor was established. The loss and temperature rise of the motor under noload condition were analyzed by the finite element method, and the correctness of the model and the simulation results were verified by experiments.
Key words: FESS；PMSM；temperature；thin copper plate
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