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An optimal current vector control for synchronous reluctance motors incorporating field weakening

In this paper, a new approach to the synchronous reluctance motor control that ensures the production of maximum torque over the entire field weakening region is presented. In other words, this paper presents an optimal control scheme for wide speed range operation of synchronous reluctance motor drives, where current vector is directly controlled. The proposed scheme possesses some attractive features when compared to the conventional current-controlled drives. The scheme incorporates optimal control strategies, such as the maximum torque per ampere operation in constant torque region and maximum torque per flux operation in field-weakening region, and operates the drive within the voltage and current limits of the motor/inverter. The control scheme has been verified by simulation tests with a prototype synchronous reluctance motor.