Axial Position and Speed Control of a Non-Salient Synchronous Axial Self-Bearing Motor using Dynamic Surface Control

The paper focuses on the controller designing for the position and speed of non-salient synchronous type axial self-bearing motors. The motor creates the magnetic field to lift the motor along the shaft and generate rotating torque. Firstly, the motor electro-mechanical relations are analyzed to formulate an accurate mathematical model, then a vector control structure is proposed. The force components control the axial position, and the torque controls the motor speed. Secondly, based on the Lyapunov stability function, the dynamic surface control is used to design position and speed controllers. The system simulation results show that the drive system ensures stability and tracking performance. In addition, the interaction between position and speed loops of the control loop is also negligible