非晶合金与硅钢片高速永磁电机定子二维温度场对比分析
Analysis and Comparison of 2D Temperature between Amorphous Alloy and Silicon Steel Sheet of High-Speed Permanent Magnet Motor
摘要: 随着中国电机进入ie3时代，电机对效率的要求越来越高。非晶合金作为一种新兴材料，具有高磁导率、低损耗等特点，开始被应用于电机生产当中。然而非晶合金材料对机械应力敏感，因此设计了一种硅钢片与非晶合金相结合的新型定子结构。由于两种材料的损耗不同，温度也会有很大的影响；同时由于高速永磁电机其转速快、绕组电流频率高和磁场空间谐波频率大导致定子铁耗、转子护套与永磁体上涡流损耗以及风磨损耗相比于其他电机的损耗有大幅度的增加；相比而言其体积小，散热差，因此对于定子结构的局部温度的研究是必不可少的。本文对一台额定功率为8 kW，转速为24,000 rpm的新型结构非晶合金高速永磁电机的定子结构进行温度场计算与分析。采用二维有限元算法分别计算定子两种材料的铁耗分布，对其各个位置的散热、导热情况，结合水冷结构加以考虑，最后进行二维温度场稳态分析与计算，对两种材料的温度进行对比与分析。对于电机局部温度情况的掌握具有一定借鉴意义。
Abstract: With the motor into the ie4 era in China, the demand on the efficiency of motor is higher and higher. Amorphous alloy as a new material with high permeability and low loss characteristics has been applied in motor production. However, amorphous alloy material is sensitive to mechanical stress, therefore, a new stator structure combined with silicon steel sheet and amorphous alloy has been designed. Because different materials have different losses, the temperature of them will be changed obviously; in addition, due to the high speed, high frequency of the winding current and high frequency of the magnetic field space harmonic, the core and copper losses of stator, eddy current loss and air-friction loss of the rotor will be much more compared to the normal speed machine. In contrast, the volume of it is little. As a result, the research for the local temperature of the stator structure is indispensable. This paper focuses on the loss analysis and thermal calculation and analyzes a 7.5 kW, 36,000 rpm new amorphous alloy structure high-speed permanent-magnet motor. The core loss of two kinds of materials is analyzed based on the 2D finite element respectively. The temperature field is analyzed by 2D steady-state temperature field analysis. The heat dissipation and thermal conductivity of every location, combined with water cooling structure are considered. At last, the results obtained are compared and analyzed. At the same time, they have reference significance to the partial temperature of new stator structure motor.
文章引用：孙哲, 刘明基, 吴界辰. 非晶合金与硅钢片高速永磁电机定子二维温度场对比分析[J]. 电气工程, 2019, 7(1): 19-31. https://doi.org/10.12677/JEE.2019.71003

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