Abstract:A parallel permanent magnetic suspension system is proposed, which is composes of a servo motor, a radial magnetized disk permanent magnet, an F shape magnetizer and suspending objects. In the system, the parallel suspending objects are two iron balls with different weights placed right under the magnetizer, the disk permanent magnet is driven by a servo motor and rotates. By changing the effective magnetic flux flowing through the suspended objects, the suspension force is controlled and the stable suspension of the two iron balls is realized. The system model is simplified based on the system structure and the parallel permanent magnetic suspension principle of the controllable flux path, and the mathematic model of the system is built, the stable suspension feasibility of the system is analyzed and the feedback gain range of the PD controller that makes the system stable suspending is analyzed. The experiment results indicate that when the PD control parameters meet the calculated range, the system can response to a small step disturbance quickly with realtime control and reach to new stable suspension state in a short response tine; the same disturbance causes the displacement responses of two iron balls in different directions, the displacement direction of the left ball is the same as that of the disturbance and the right one is inverse to that of the disturbance.