Design Optimization of Magnetic Bearing Composed of Permanent Magnets for the Bearing-Less Motor

Bearing-less motor causes large mechanism or complicated control system. We suggest a simple bearing-less motor composed of disk motor and magnetic using only permanent magnet. Our model makes better use of the attractive force of motor and the repulsion force of permanent magnet and attempts magnetic levitation. We make an experimental device to measure torque and attractive force and measured them. We calculate the repulsion force of a pair of cylindrical permanent magnet bearing using the equivalent surface current model. On the basis of the results above, this article finally studies the relationship between the attractive force of the motor and