考虑温度变化的高温高速永磁电机转子涡流损耗半解析模型及实验验证

Semi-analytical Model and Experimental Verification of Rotor Eddy Current Loss of High Temperature High Speed Permanent Magnet Machine Considering Temperature Change

高温高速永磁电机由于工作环境的特殊性,在计算电机转子涡流损耗时,需要进行磁热耦合仿真,导致计算时间较长,而现有子域模型在建模时需首先假设材料属性参数为恒定值,不能考虑温度的影响。首先,将精确子域法与等效热网络相结合,提出一种可以考虑转子材料电导率及导热系数随温度变化的高温高速永磁电机转子涡流损耗半解析模型;其次,基于该模型分析了在高温状态下不同供电频率及护套材料对转子涡流损耗和永磁体温升的影响,得到针对高温高速永磁电机转子护套材料的选取方法;最后,对一台高温高速永磁电机分别进行损耗分离实验和温升实验,将实验与解析结果作对比,验证解析模型的正确性。

Due to the particularity of the operating environment of high temperature high speed(HTHS)permanent magnet(PM) synchronous motor(PMSM), the magneto-thermal coupling simulation is needed to calculate the rotor eddy current loss(RECL) of the motor, which leads to a long calculation time. However, the accurate subdomain model should assume that the material property parameters are constant, and the influence of temperature cannot be considered. Firstly, a semi-analytical model of HTHS RECL was established by combining the precise subdomain method with the equivalent thermal network(ETN) considering the variation of rotor material electrical conductivity and thermal conductivity parameters with temperature. Based on the model,the effects of different sleeve materials on RECL and PM temperature rise at high temperature were analyzed, and the design method of sleeve material for HTHS PMSM was obtained. Finally, the loss separation and temperature rise experiment of a HTHS PMSM were carried out, and the experimental and analytical results were compared to verify the correctness of the model.