短路容错控制在多相无轴承永磁同步电机中的可行性分析

容错性作为多相无轴承永磁电机关键技术之一,其控制系统的可行性对提高整个电机的安全性和鲁棒性具有重要意义。本文对多相无轴承永磁电机短路故障下的控制模型及其短路电流表达式进行了推导。在此基础上,提出以某特定矩阵的三阶非零子式或其行秩作为短路容错控制的可行性判别依据。并以一台六相无轴承永磁电机为例,对其中任意一相、两相和三相绕组发生短路故障时的容错控制可行性进行了系统分析和归纳,且给出了该电机的短路容错控制系统框图。文中还利用有限元仿真对短路故障下的电机运行状态作了详细分析,并在一套原理样机平台上进行了实验验证。

Feasibility of Fault-Tolerant Control of Multi-Phase Permanent Magnetic Bearingless Motors with Short-Circuited Phases

As a key technology of multi-phase PM bearingless motors,a feasible fault-tolerant control system is vital for improving their safety and robustness.In this paper,the control model with different short-circuited faulty phases and the short-circuited current expression are established.Moreover,its corresponding discriminant condition is proposed based on third-order nonzero minors or the row rank of a certain matrix.As an example,the feasibility of the fault-tolerant control with arbitrary single,double or triple short-circuited phase(s) for a six-phase PM bearingless motor is discussed in detail.The fault-tolerant control system with short-circuited cases is shown.Simulation results from finite-element analysis are presented to demonstrate the operation of the motor under the proposed fault tolerant control.A principle prototype is developed and the experimental results are also provided to further demonstrate the analysis.