Bearingless PM-synchronous machine with axial active magnetic bearing fed by zero-sequence current

Abstract A novel inverter supply for bearingless PM-synchronous motors with magnetic suspension allows the reduction of number power electronic switches. Hence, all six motional degrees freedom AC machines may be controlled via 3-phase topologies. In this paper, instead a motor consisting two half motors, one an additional radial active bearing is treated. Bearingless cylindrical rotors in contrast to double cone generate – apart from electromagnetic torque only forces. axial used. For bearing, there no need feeding converter bridge as coil fed by zero-sequence current inverters. The placed between star points winding. amplitude adjusted inverters pulse width modulation. feasibility kind position control proven simulation well experiment 1 kW prototype up 60000 min ?1 .