Design and Construction of a Sensor-less Drive for Synchronous Reluctance Motor with Offset Voltage Injection Technique for Rotor Position Estimation

This paper proposes a new controller with a high-frequency (HF) offset voltage injection technique for rotor position estimation in sensor-less synchronous reluctance drive systems. In this regards, the theory, mathematical model and simulation are presented to show the use of a HF injection method that takes into account the effects of unequal inductances and the influence of speed reduces the rotor position estimation error. To demonstrate the practicability, the proposed method are implemented in a test bench using a LPC-1768 Cortex M3 digital Microprocessor to control a 750W prototype synchronous reluctance motor (Syn-RM) drive. Experimental results are presented to show that the load disturbance and tracking responses of the proposed drive system. Both experimental and simulation analyses clearly indicate that the proposed HF offset voltage injection method offers improved performance in adjustable speed synchronous reluctance drive systems.