Adaptive two-degree-of-freedom control for two-phase synchronous reluctance motors based on Pole-Zero Cancellation method

This paper presents a novel control scheme for a two-phase synchronous reluctance motor (TPSynRM) . A three-leg two-phase inverter is used to drive the TPSynRM. The torque of the TPSynRM is controlled with a direct torque control (DTC) method. DTC uses the space vectors of the three-leg inverter. The speed controller has a two-degree of freedom (TDOF) structure. A pole-zero cancellation (PZC) method is used to design the parameters of the speed and position controllers. Furthermore, an adaptive identifier is used to obtain the accurate coefficients of the motor pulse transfer function. Speed and position characteristics are shown in difference cases and the identified parameters are presented in transient states experimentally. Differences of the system responses are revealed when the system poles and zero are changed. These experimental facts prove that the proposed method is actually useful.