Design of Suspension Control System for Bearingless Motor

Bearingless motor, which combines characteristics of alternating current motor and magnetic bearing, can operate without magnetism suspension bearing by making use of magnetism suspension bearing winding that produce magnetism suspending power in the motor stator. Through torque winding and suspending power winding decoupling control, it can make the motor rotor to produce torque and suspension simultaneously. The bearingless motor features high speed and little friction etc. It is one of current hot research areas. The design of bearingless motor suspension control system is the key of this research. The basic principle of the bearingless motor suspension control is introduced and the design of the suspension control system based on the directional magnetic field of torque winding rotor is provided in the paper.