Permanent magnet synchronous motor control system based on auto disturbances rejection controller

The field oriented control technique is widely used in high performance motion control of induction motors. However, in real-time implementation, precise decoupling which requires accurate motor parameters can´t be fully realized due to significant plant uncertainties such as external disturbances, parameter variations and plant nonlinear dynamic, this may deteriorate the dynamic performances of flux and torque significantly. To achieve high dynamic performance of drive system, a nonlinear auto-disturbance rejection controller to the control of AC permanent magnet synchronous servo motor (AC-PMSM) direct torque control speed system is presented in this paper. An Improved auto-disturbance rejection controller (ADRC) was proposed to realize decoupling control and disturbance rejection. This controller overcomes the rough character of non-linear function in nonlinear state error feedback of conventional ADRC. The result of simulation and experiment indicate the control system of PMSM has better dynamic and robust characters by using improved auto disturbance rejection controller.