Research On Indirect Position Detection Of SR Motor Based On Sliding Mode Control

Switched Reluctance Motor(SRM, switched reluctance motor) is a new type of electromechanical integrated speed regulation system, which is made up of the double salient pole reluctance motor, controller, power switching circuit and detection system. It has the advantages of simple structure, reliable operation, flexible control, low cost, and can work in harsh environment. In addition, it also has good speed control performance and strong fault tolerance ability, and its application prospect is very broad. However, the introduction of position sensor, the operating environment of the motor is limited, the cost of the motor increases, and the volume of the motor increases. As a result, it is a hot spot for the research of the sensorless position estimation technology of switched reluctance motor.Aiming at the problem mentioned above, this paper studied the sensorless control of switched reluctance motor, a novel sensorless control method for switched reluctance motor based on sliding mode observer is proposed, which combined with the five point magnetic chain model, to realize the indirect detection of rotor position of switched reluctance motor. The method does not require additional hardware devices, algorithm is relatively simple, it’s easy to achieve, and the ability to resist disturbance is better. In this paper, the simulation model of SIMULINK of 12/8 pole switched reluctance motor is built by simulation software MATLAB according to the presented method. The model uses a double closed loop control system. According to the simulation model, a series of simulation analysis of the proposed method is carried out. Simulation results show that the sensorless control of switched reluctance motor based on sliding mode observer can effectively achieve the detection of rotor position and speed, the measurement error is small, and the robustness of the system is good. Then the 12/8 pole switched reluctance motor test platform is built based on dSPACE, first of all, the experimental study on the five point magnetic chain model is carried, after that the experiments of the proposed method are carried out to verify the validity and feasibility.