Research on feedback linearization control of linear magnetic suspension synchronous motor for CNC machine

In the magnetic suspension system of linear synchronous motor for CNC machine, the non-linear coupling between armature current, suspension height and horizontal velocity, as well as the uncertain factors such as load disturbance, which will have a lot of adverse effects on the control system. In order to solve this problem, it proposes a new decoupling control method. Establishing mathematical model of controllable excitation suspended linear synchronous motor(CELMSSM), get the affine nonlinear model of the motor by selecting appropriate state variables, based on the traditional current control, using the differential geometry theory of nonlinear system the nonlinear model of motor affine is decoupled and linearized into three independent linear subsystems of straight axis current subsystem through coordinate transformation and state feedback, horizontal speed subsystem and suspension height subsystem; Design the control law of the system according to the optimal pole assignment method thus realizing the dynamic decoupling of CELMSSM. Finally, the control system is simulated, through the comparison between feedback linearization control and traditional PI control simulation, the results show that the proposed control strategy can significantly enhance the dynamic and static performance of the system.