Control of permanent magnet synchronous motor using observer based vector nonlinear controller

Permanent magnet synchronous motors are widely used motors in various industries. Speed ​​control of these motors is of special importance that can be done using a closed loop control system. Due to the nonlinear dynamics of this type of motor, in recent years, nonlinear controllers have been used to control permanent magnet synchronous motors. One solution for controlling uncertain nonlinear systems is to use an observer-based nonlinear controller. In this method, uncertainty estimation is provided to the controller using an extended state observer. Another challenge in controlling a permanent magnet synchronous motor is the two input- two output of the dynamic system of this type of motor. Therefore using multivariate control techniques will be desirable for the design of the control input vector. In this paper, a combined vector observer-based nonlinear method is used to control the two inputs - two outputs system of a permanent magnet synchronous motor. For this purpose, using an extended observer, the load torque, which is assumed to be uncertain, is estimated, and then the smooth multi-input-multi-output sliding mode method is used to design the control input vector. The proposed hybrid method has the advantages of nonlinear, robustness to uncertainty, finite time convergence, and vector based controller design. These features are demonstrated analytically as well as using computer simulations.