Predictive controller design for a high‐frequency injection sensorless synchronous reluctance drive system

This study proposes implementation of a predictive controller for a sensorless synchronous reluctance drive system. First, high‐frequency voltage is injected in the α ‐axis. Then by measuring the α – β axis high‐frequency currents, the rotor position of the SynRM can be estimated. After that, a predictive speed controller is implemented to improve transient responses, load disturbance responses, and tracking responses. To demonstrate its viability, a proposed 560 W sensorless drive system is implemented by using a TMS‐320F‐28335 DSP made by Texas Instruments and some circuits. Experimental results clearly indicate that the proposed high‐frequency α ‐axis voltage injection method with a predictive speed‐loop controller offers superior responses including faster transient responses, better load disturbance responses, and better tracking responses than a high‐frequency d – q axis voltage injection method with a PI speed‐loop controller.