Sensorless Control of Synchronous Reluctance Motor Based on Linear Active Disturbance Rejection Improved High Frequency Injection Method

Synchronous reluctance motor is a new type of cost-effective motor, has the advantages of simple structure, low material cost, wide speed control range and so on, has a wide application prospect. In this paper, the sensorless vector control of synchronous reluctance motor is studied by improving the high frequency pulse voltage signal injection method, which is mainly aimed at the motor operation at zero low speed. The traditional high frequency pulse voltage injection method is to inject the high frequency sinusoidal voltage signal into the direct axis of the dq coordinate system and obtain the rotor position information by demodulation of the stator current dq axis component. The improved high frequency pulse voltage injection method can obtain the rotor position information by demodulation of the stator current αβ axis component. Meanwhile, a simplified linearized active disturbance rejection control algorithm is used in this paper to optimize the speed closed-loop control of synchronous reluctance motor. Through simulation and experimental analysis, it is verified that the control strategy can effectively improve the estimation accuracy of the rotor Angle and speed of synchronous reluctance motor. It can improve the control effect of the system and has a good engineering application prospect.