High performance nonlinear MIMO field weakening controller of a separately excited dc motor

摘要

This paper presents a novel technique for field weakening implementation of separately excited dc motors. A constant power field weakening controller, which is based on nonlinear load adaptive multi-input multi-output (MIMO) lineariztion technique, is proposed and developed for achieving speed tracking. Due to the effects of decoupling and linearization, it allows the controller to be implemented and operated at any desired field weakening point of operation. To demonstrate the effectiveness of the proposed controller, the results of computer simulations re presented for a specific motor. The performance of this proposed controller is compared with that of the traditional linear PI controllers. The results show that the proposed controller provides the globally higher speed control performance, while the motor is operated over a wide dynamic regime of field weakening, even under the presence of load torque disturbance.