电机定子铁心片间短路故障分析的解析法

Analytical method for short-circuit fault analysis betweenstator and stator core of motor

为了分析电机定子铁心片间短路故障,提出一种故障区域电气量参数的解析计算方法。在考虑硅钢片中交变磁场的集肤效应的基础上,推导硅钢片磁场的解析式和复功率表达式,进而求出单片硅钢片感应电压;并根据单片硅钢片等效电路分别建立初始故障和完全故障区域等效电路。再根据故障域等效电路计算相关电气量参数,定量分析故障片数对故障区域电气量参数的影响。最后通过有限元仿真和片间短路故障实验验证文中所提方法的正确性与有效性。结果表明:解析法计算结果与有限元仿真和实验检测结果有较好的一致性,本文提出的方法可以有效地用于片间短路故障分析。

In order to analyze the short circuit fault between the stator core pieces of the motor,an analytical calculation method for the electrical quantity parameters of the fault area was proposed.On the basis of considering the skin effect of the alternating magnetic field in the silicon steel sheet,the analytical formula and complex power expression of the magnetic field of the silicon steel sheet were derived,and then the induced voltage of the single-piece silicon steel sheet was obtained;and the equivalent circuit of the single-piece silicon steel sheet was respectively established.They are initial fault and full fault area equivalent circuit.The relevant electrical quantity parameters were calculated according to the equivalent circuit of the fault domain,and the influence of the number of faults was analyzed quantitatively on the electrical quantity parameters of the fault area.Finally,correctness and effectiveness of the proposed method are verified by finite element simulation and inter-chip short-circuit fault experiments.The results show that the analytical results are in good agreement with the finite element simulation and experimental results.The proposed method can be effectively used for the analysis of short-circuit faults between slices.