Unified Vector Torque Control for Reluctance Motor With Different Coil Pitch

This article unifies the vector torque control of reluctance motor with different coil pitch in the classic vector model frameworks, including the typical switched reluctance motor (SRM), mutually coupled SRM (MCSRM), synchronous reluctance motor (SynRM), etc. Based on the proposed vector model, the instantaneous electromagnetic torque of the reluctance motor is decoupled into two components. The first partial torque is called as the synchronous-speed reluctance force (SSRF), generated by the interaction of the d -axis and q -axis currents. The second partial torque is the double-speed reluctance force (DSRF), generated by the interaction between the dq -plane current and the 0-axis current. The torque formula can reflect the torque generation and fluctuation reasons, and the proportion of the two torque components is related to the ratio of the varying components of the motor's self-inductance and mutual inductance. Different types of reluctance motors can be summarized in the unified vector model. The conclusion is that the SynRM only contains the SSRF torque, whereas the typical SRM and MCSRM contain both the SSRF torque and DSRF torque. The proposed unified vector torque control method is verified by simulations and experiments of 12-slot 8-pole reluctance motors with different coil pitch.