DESIGN AND IMPLEMENTATION OF A SENSORLESS SWITCHED RELUCTANCE DRIVE SYSTEM

This paper presents a new sensorless switched reluctance drive system. The drive system can perform well when the system is operated in the pulsewidth modulated (PWM) region. By suitably shaping an induced volt age in an inactive phase which is adjacent to an energized phase of a switched reluctance motor (SRM), the shaft position of the rotor can b e easily obtained. As a result, the position sensor can be eliminated. First, the theoretical analysis of the proposed method is presented. By systematic theoretical analysis, a voltage signal which can easily estimate the shaft position of the motor Is derived. This signal is on ly related to the input de voltage of the converter, and the self and mutual inductances of the motor. Then, a new method to measure the sel f and mutual inductances of the SRM is proposed. After that, the desig n for a simple circuit which can synthesize the required voltage signa l for rotor position estimation is presented. Next, how a 32-bit micro processor system is used to execute the position and speed estimation, speed-loop control, and current-commands generation is shown. A close d-loop drive system is thus achieved. Several simulated and experiment al results validate the theoretical analysis. A new direction in the d esign and implementation of a sensorless switched reluctance drive sys tem is presented.