Abstract
This paper proposes an improvement method of zero suspension force of a permanent magnetic suspension device. The zero suspension force of a magnetic suspension device is indispensable for floating off from the adhere position. Generally, the magnetic suspension system using permanent magnet is difficult to realize the zero suspension force, since the permanent magnet cannot make its attractive force zero. However, the proposed magnetic suspension device that mainly consists of a disk-shape permanent magnet, two "F" shape iron cores, a suspended object, and an actuator, has realized the semi-zero power suspension and semi-zero suspension force. In the magnetic suspension device, since there is magnetic leakage, the suspension force could not be made exact zero. Therefore, in this paper, the zero suspension force performance will be improved using a special shape permanent magnet. Some IEM (Integral Element Method) analysis and experimental measurement have been carried out, and the comparison results indicate that the zero suspension force is decreased above 83 percent comparing with the original device in generally using conditions. Finally, the suspension simulation and experiment results indicate that the suspended object can be levitated robustly.