Hairpin绕组电机电压分布仿真计算与绝缘优化  

Voltage Distribution Simulation and Insulation Optimization of Hairpin Winding Motor

作　　者：黄文冬 王鹏[1] 朱英伟[1] 马世金 HUANG Wendong;WANG Peng;ZHU Yingwei;MA Shijin(College of Electrical Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学电气工程学院,成都610065

出　　处：《高电压技术》2023年第6期2458-2465,共8页High Voltage Engineering

基　　金：国家自然科学基金(51977134)。

摘　　要：SiC逆变器驱动下Hairpin绕组电机承受高频、快速变化的复杂脉冲电应力,电机发生绝缘失效的可能性大为增加。为了解电机内部绕组的电压分布情况,对电机的绝缘可靠性做出评估,通过场路耦合有限元法对1台额定电压800 V的Hairpin绕组电机进行电压分布计算,得到了电机绕组中的电压分布规律。通过仿真和实测分析发现:电机的最大相地电压出现在三相绕组的入线端,数值为540V;匝间和相间电压最大值出现在绕组连接电路中串联顺序相距最远而空间上相邻的位置,分别为575V和923V;实测验证了计算结果的准确性,电压最大值处仿真与实测的误差为8%。基于仿真模型,发现30%的匝间或对地电容变化量对绝缘关键位置电压大小的影响不超过5%,并结合Dakin公式对电机的绝缘设计提出优化建议。以上结果可为Hairpin绕组电机的绝缘可靠性评估与绝缘设计提供借鉴。Driven by SiC inverter,Hairpin winding motor is subjected to complex pulse electrical stress with high frequency and rapid variation.The possibility of insulation failure in motor is greatly increased.In order to find out the voltage distribution in motor windings and to evaluate the insulation reliability,the voltage distribution for a Hairpin winding motor with a rated voltage of 800 V is calculated by the field-circuit coupled finite element method.The voltage distribution rule in the motor winding is obtained by simulation.Through simulation and measurement analysis,it is found that the motor’s maximum phase-ground voltage is 540 V,which is located in the inlet end of the three-phase winding.The maximum voltage of turn-turn and phase-phase appears at the positions that are the farthest apart in series sequence in winding circuit but adjacent in space,and the voltages are 575 V and 923 V,respectively.The measurement proves the accuracy of the calculation results.At the maximum voltage point,the error between simulation and measurement is 8%.Based on the simulation model,it is found that 30%of the capacitance variation between turn-turn or turn-ground has no more than 5%influence on the voltage at the key position of insulation.Combined with Dakin formula,the optimization suggestions for the insulation design of motor are put forward.The above results provide reference for insulation reliability evaluation and insulation design for Hairpin winding motor.

关 键 词：变频电机 有限元法 Hairpin绕组 电压分布 绝缘优化 

分 类 号：TM30[电气工程—电机]