Simulation of SRM Sensorless Control System for Electric Vehicle

Switched Reluctance Motors (SRM) have simple construction, high reliability, a very wide speed range, and are low cost. The switched reluctance drive system needs accurate rotor position signals for high performance control. The sensors are utilized for position detection. In general, defects in the speed sensor may be caused by dust, high temperature, large vibrations and electromagnetic disturbances. The effects from these problem may lead to error drive signal generation, which can cause motor damage. Sensorless control is a method to solve the position signal faults problem. In this paper, we propose position signal faults analysis and solve signal faults on a 3 phase 12/8 Switched Reluctance Motor (SRM) for electric vehicle (EV) applications. To analyze signal faults, generally control systems need peed of rotor ω to calculate position of rotor θ. We will make a simulation model of speed sensor faults, which the result of measured speed of rotor ω is immediately zero. The effect of calculated position of rotor θ may lead to abnormal operation. To solve this problems, the position and speed estimations are obtained from phase voltage. This method of analysis and solving is simulated by using MATLAB/Simulink.