Magnetically levitated motor

摘要

A magnetic levitation motor (1) has a rotor (10) with a rotor magnet (12) magnetized in multiple poles, and a stator (20) with rotor driving coils (26) disposed confronting to the rotor magnet for generating a rotational torque on the rotor, and bearing coils (27) for generating a bearing force in a direction perpendicular to a rotational axis of the rotor. The rotor driving coils (26) and the bearing coils (27) are shifted with respect to one another in a circumferential direction to avoid overlapping with one another. A displacement sensor is provided for detecting displacement of the rotor with respect to a plane that is perpendicular to the rotational axis of the rotor, wherein the rotor is rotated by the rotor driving coils, and the currents flowing in the bearing coils are controlled in accordance with output of the displacement sensor to keep the rotational axis of the rotor at a predetermined position.