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针对传统位移传感器灵敏度容易受温度和电磁噪声干扰,增大电机体积和结构复杂度等问题,在研究磁悬浮开关磁阻电机转矩绕组和悬浮力绕组之间互感与转子径向位移非线性关系的基础上,研究了一种实用的转子径向位移自检测方法。具体做法是：将一高频测试电流注入转矩绕组,然后在悬浮绕组端电压中滤出由该测试电流引起的互感电压,解调后提取出直流部分,再经简单数学处理后即可得到转子的径向位移。该方法无需专用的位移传感器,简单易行,可以减小电机尺寸,并提高系统的可靠性。仿真及dSPACE平台的实验结果验证了该方法的正确性和有效性。“,”Since traditional displacement sensors were sensitive to temperature and electromagnetic noise,and tended to cause size,cost,and complexity increment,a kind of practical radial displacement self-test method was put forward in this paper.This method is based on mutual inductance between torque winding and radial force winding,which is a nonlinear function of radial displacement.Detailed steps were as follows： firstly,injected high frequency testing current into the torque-winding;secondly,filtered the mutual inductance voltage on radial force winding caused by this test current;thirdly,demodulated the measured signal and then processed with a low-pass filter to separate the direct current portion;and lastly,rotor’s radial displacement could be detected after simple mathematical treatment.With this method,no special radial displacement sensor is required anymore,and the reliability of whole system can also be improved.Simulation and dSPACE platform experimental results confirmed this simple and convenient method.