具有高精度的永磁容错电机非线性电感分析及其解析式求取

Analysis and Prediction of High Accuracy Nonlinear Inductance Analytical Formulation of Fault-tolerant Permanent Magnet Machines

以六相十极永磁容错电机(FTPMM)为例,通过对电机中磁力线分布的分析,得出FTPMM绕组自感的各个主要组成部分,即激磁感、谐波漏感、槽口漏感和槽内漏感,并分析出FTPMM的大电感是通过增加槽口漏感和谐波漏感来实现的。为提高电机优化设计的正确性,提出了新的磁路模型,并引入槽口磁压降参数和槽口计算厚度参数,得出了具有高精度的非线性绕组自感及其组成部分的解析式。最后通过有限元法(FEM)及实验验证,该解析式的精度在1.3%以内,并且电机具有很强的容错能力,对永磁容错电机的优化设计和性能分析有理论指导意义。

A six-phase ten-pole fault tolerant permanent magnet motor（FTPMM） is taken as an example to obtain the chief components of its winding self inductance, such as the magnetizing inductance, harmonic leakage inductance, slot opening leakage inductance and slot inner leakage inductance, by analyzing the distribution of magnetic flux; and large inductance is found to be realized by increasing the leakage of slots and harmonics. In order to improve the validity of the optimization in motor design, a new magnetic circuit model and arithmetics are put forward, then a high accuracy nonlinear analysis formulation of winding self inductance and its portions are obtained by introducing two parameters： the calculation thickness and the magnetic force of slot opening. The largest error of self inductance calculated by the analysis method is below 1.3 % as compared with the verification results of finite element method（FEM） and experiments, which shows that the motor possesses strong fault tolerance. Therefore, the analytical formulation provides a theoretical reference for fault-tolerant motor optimization design and performance analysis.