Design and Application for Power Amplifier of Magnetic Bearing

Power Amplifier is a crucial part in the magnetic bearing control system, so the performance of power amplifier plays an important role in the magnetic bearing control system. According to the 5-DOF active magnetic bearing system, the half bridge structure which needs twenty power parts in total is generally used, with a bulky bearing controller. so this kind of power amplifier cannot be appropriate for the magnetic compressor who has a strict installation size require。A novel kind of power amplifier is proposed which is based on the common lower bridge structure, with the ability of decreasing the amount of the power parts to 15 and cutting down the volume of bearing controller. The simulation and test shows that the common lower bridge has a good response of capability and actual performance.