A decoupling control method of reluctance-type bearingless motors considering magnetic saturation

The interference of the torque component current of a motor with the radial position control of reluctance-type bearingless motors is investigated. In order to cancel this interference, a decoupling control method has been proposed. With this method, machine parameter identification of radial force production is very important. It is shown that the radial force constants exhibit significant variations in accordance with the torque component current due to magnetic saturation. The parameter tuning of the decoupling compensator taking into account the magnetic saturation is found to realize very stable operation in radial rotor position control.