大型电机定子铁心片间短路故障分析

Faultanalysis of Short Circuit Between Pieces of Large Motor Stator Cores

为了分析大型电机定子铁心片间短路故障,对故障模型的建立进行了研究。依据均质化理论,研究出铁心片间短路故障模型。建立了片间短路故障模型的等效电路,并给出了利用均质化求解的等效电导率表达式,对三维涡流场片间短路故障模型进行计算与分析,最后通过片间短路故障实验验证文中所提均质化建模方法的正确性与有效性。结果证明:故障处的电压要远大于非故障处;齿部故障区域的电压大于轭部故障区域的电压;故障片数越多,电压越大。实验结果与有限元分析结果相吻合,说明均质化建模法可以进行片间短路故障模型分析。

In order to analyze the short circuit fault between the stator core pieces of large motors,the establishment of the fault model was studied.According to the homogenization theory,the short-circuit fault model between iron cores is studied.The equivalent circuit of the inter-chip short-circuit fault model is established,and the equivalent conductivity expression using homogenization is given.The three-dimensional eddy current inter-slice short-circuit fault model is calculated and analyzed.Finally,the inter-chip short-circuit fault test is passed.Verify the correctness and effectiveness of the homogenization modeling method proposed in the paper.The result proves that the voltage at the fault is much larger than the non-fault;the voltage in the fault area of the tooth is greater than the voltage in the fault area of the yoke;the more the number of faults,the larger the voltage.The experimental results are consistent with the results of finite element analysis,indicating that the homogenization modeling method can analyze the inter-chip short-circuit fault model.