Scalar control of a new phase-decoupling permanent magnet synchronous motor for servo application

This paper presents a new scalar-controlled phase-decoupling permanent magnet synchronous motor (PD-PMSM) which takes the advantages of smooth torque, fast response and good controllability for servo applications. Because of the PD nature, the proposed scalar control strategy can simply adjust the phase current amplitude and its angle with respect to the back EMF to achieve direct torque control Experimental results are given to verify the advantages of the proposed scalar-controlled PD-PMSM.