Abstract
This paper proposes an improvement method of zero suspension force performance using a special permanent magnet for a magnetic suspension device. The zero suspension force of a permanent magnetic suspension device is indispensable for floating off when the suspended object is stuck on accidentally. 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 has realized the semi-zero power suspension and semi-zero suspension force, which mainly consists of a disk-shape permanent magnet, two “F” shape iron cores, a suspended object, and an actuator. 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 will be improved using a special shape permanent magnet. The comparison results indicate that the zero suspension force is decreased about 80 percent.
Highlights
Until now, many magnetic suspension devices have been proposed, and applied in many fields [1]
Many magnetic suspension devices have been proposed, and applied in many fields [1]. Most of these magnetic suspension devices are using electromagnet whose attractive force can be controlled by its current
The results indicate that the rotation of the angle of the special magnet can control the suspension force, and the special magnet does not change the force performance of the magnetic suspension device
Summary
Many magnetic suspension devices have been proposed, and applied in many fields [1]. Most of these magnetic suspension devices are using electromagnet whose attractive force can be controlled by its current. We call the attractive force used to suspend an object or a device as the suspension force in the magnetic suspension system. When the current is zero, the suspension force of the electromagnetic suspension (EMS) device is zero. The zero suspension force of magnetic suspension device is indispensable for floating off when the suspended object is stuck on accidentally. The EMS has some disadvantages of heat generation, high-energy consumption, big coil size, and so on
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