永磁直线同步电机的发热严重影响电机的正常运行,准确计算温度场将为设计和控制电机提供必要的理论依据. 建立了扁平型直线电机温度场的三维有限元模型. 在直线电机变速往复运行时,先计算出电机的平均有效电流,在此基础上,计算出了直线电机的发热量. 确定了直线电机各个表面的换热系数,利用ANSYS软件模拟出了直线电机的热态特性. 最后,对空载工况下直线电机的热态特性进行了实验研究,并对实验结果进行了分析处理. 实验表明,仿真结果和实验结果具有比较好的一致性,建立的直线电机温度场模型可以准确地计算电机的温度分布.%The heat of linear motor affects normal operation of the motor seriously. The accurate computa-tion of temperature field will provide a theoretical foundation for the design and control of linear motor. A three-dimension finite element heat model of flat linear motor is created. As the linear motor is running back and forth in an adjustable speed, the average effective current of linear motor can be calculated firstly. On this basis, the calorific value of the linear motor is calculated. The heat transfer coefficient of linear motor in each surface is calculated. Then the thermal characteristic of the flat linear motor is calculated by ansys. The experimental research of the linear motor' s thermal characteristic is completed when the linear motor is no load. Comparisons between the experiment analyses and finite element simulation show good correlation. The thermal characteristic of the linear motor can be simulated accurately by the thermal model created in this paper.
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