Research on Zero and Low Speed Startup of Synchronous Reluctance Motor Based on High Frequency Injection Method

For synchronous reluctance motors, there are more and more researches on position sensorless vector control. However, when starting at zero speed or low speed, some problems are often encountered. These problems often affect the overall control effect of the synchronous reluctance motor. To improve the control effect, this paper studies the starting effect of the synchronous reluctance motors. Using the salient pole characteristics of the synchronous reluctance motors, the method used in this article is the rotation high-frequency voltage signal injection method. The high-frequency sine (cosine) signal is injected into two-phase stationary coordinate system of the motor at the same time. The actual rotor position angle will be obtained from the response current. Simulation uses this method and the simulation results respectively show the zero-speed and low-speed startup effects. This method can accurately estimate the rotor angle and realize zero-speed and low-speed starting. These results verify the correctness of the method.