The Rotor Speed and Position Sensorless Control of Switched Reluctance Motor using the Adaptive Observer

초록

The speed control of a SRM(Switched Reluctance Motor) needs the accurate position and speed data of the rotor. This information is provided by a shaft encoder or a resolver. In some cases, the environments in which the motor operates may cause difficulties in maintaining the satisfactory position detection performance. The elimination of the position and speed sensor has gained wide attention. The speed and position control of SRM(Switched Reluctance Motor) needs the encoder or resolver to obtain the rotor position information. Generally utilized speed sensors are mal-affected by the EMI, dusty, and high temperature surroundings. Therefore the speed and position sensorless controls have been studied widely. In this paper, a new algorithm for the estimation of the rotor position and speed is described for the SRM drives. This method used a nonlinear adaptive observer using the MRAS(Model Reference Adaptive System). The observer is proved by the Lyapunov Stability Theorem. This algorithm was implemented with a DSP(Digital Signal Processor) TMS320C31. Experimental results prove that the observer is able to estimate the speed and position with a little error.