A novel control scheme for maximum power operation of synchronous reluctance motors including maximum torque per flux control

This paper proposes a novel control scheme for maximum power operation of synchronous reluctance motors. The proposed scheme consists of a combination of maximum torque per ampere control, maximum torque per flux control, flux-weakening control and torque limiting. The first three control methods are based on a mathematical model in a rotating reference frame that is synchronized with the stator flux-linkage. The final method utilizes a reactive torque calculated as the inner product of the flux and current vectors. The proposed control scheme is suitable for direct torque control or flux-oriented control. In this paper, the scheme is applied to a direct-torque-control-based motor drive system. The validity of the control scheme is verified by simulation and experimental results.