Operation Test of Magnetic Bearing by Regenerated Power from High-Speed IPM Motor at Unexpected Power Stop

Two pole Internal Permanent Magnet (IPM) type high speed motor has been developed. Hybrid (HB) magnetic bearing is designed and tested by regenerated energy from high speed motor after sudden power stop. The motor should have wide air gap for levitation and the rotor speed is better to be decreased before touch down. The regenerative brake is useful to reduce the rotor speed and to operate the magnetic bearing by the regenerated energy. The motor is designed with a commercial FEM code MagNet. The previously developed magnetic bearing is modified and used to support one end of the rotor shaft and another end is supported by a ball bearing. The motor-bearing system is fabricated and the sudden power stop is tested.