A Common-leg Power Electronics Converter for Multi-axis Active Magnetic Bearing Drive

This paper has proposed a common-leg structure power electronics converter to drive the multi-axis active magnetic bearing(AMB) system. With this new structure, the number of devices is obviously reduced compared to existing topologies so that the cost can be decreased. Simulation and experiment are carried out to validate the feasibility of this converter. The results show that the current in either coil can be controlled independently and will not be influenced by the variation of other coil current. It also shows the performance of common-leg converter in the 4-DOF AMB system. The position of the rotor can be well controlled with this converter while the cost of the control system is greatly reduced.