Suspension Characteristics of a Zero-Power Permanent Magnet Suspension System With Flux Path Control

A proposed permanent magnetic suspension using flux path control mainly consists of a disk permanent magnet, two pairs of F-type permalloy and a servo motor, and controls the suspension force by changing flux path, and the load on the motor shaft is eliminated due to its symmetric offset optimal structure to make the motor reach zero power output. In order to study the robustness of the system under external disturbances, this paper studies its suspension characteristics. Firstly, the structure and the suspension principle of the system are introduced. Secondly, the dynamic model is established, the controller of system is designed with the classic PD control method. Finally, the suspension characteristics of the system are studied through simulation and experiment. In the process of the experiment, the system is subjected to small step disturbance or small force disturbance, under the action of the real-time control system. The experimental results show that when the system is subjected to small step disturbance or small force disturbance in the process of the suspension, the suspended object will reach a new equilibrium position under the action of the real-time control system.