A new model for IPMSM with rotating high frequency voltage injection

Controlled synchronous machine drives without mechanical speed sensors at the motor shaft have the attractions of low cost and high reliability. The eliminating of the speed sensors requires the estimation of speed from the machine itself. At standstill and low speed only the high frequency signal injection methods (HFSIM´s) able to give accurate position estimation. The HFSIM´s exploit the machine saliency property which contains the information about the rotor position or flux position and track it by injecting a high frequency excitation. For applying these methods the machine drives must be presented the saliency, as the interior permanent magnet synchronous machine (IPMSM) presents an inherent saliency in its rotor, the application of HFSIM is available. This paper presented a high frequency IPMSM model adopted for sensorless control applications. This model is obtained by add the rotating high frequency signal voltage to fundamental supply. The effects of injected signal to the performance of IPMSM are studied and analyzed in this paper through the simulation test.