US 6,320,290 B1 · Magnetic levitated motor

Abstract

A rotor includes a rotor magnet magnetized to have a multiple of magnetic poles. A stator, while confronting with the rotor, includes a rotor driving coil set for generating a rotational torque in the rotor, and a bearing coil set for generating a bearing force having a direction perpendicular to the rotational axis direction of the rotor. The number of magnetic poles of the rotor magnet is eight. The number of coils of the bearing coil set of the stator is six. Displacement sensor is provided for detecting a displacement of the rotor, in a direction perpendicular to the rotational axis of the rotor. The rotor is rotated by the rotor driving coil set. Currents flowing in the bearing coils are controlled in accordance with output of the displacement sensor to hold the rotational axis of the rotor at a predetermined position.

Claims15

Dependent claims

A magnetic levitated motor comprising:

at least one rotor provided with a rotor magnet magnetized so as to have eight magnetic poles;
at least one stator confronted with the rotor while rotatably supporting the rotor with magnetic force, the stator provided with rotor driving coils confronted with the rotor magnet to generate a rotational torque in the rotor to rotate the rotor, and six bearing coils for generating a bearing force in a direction perpendicular to the rotational axis of the rotor;
and
a displacement sensor for detecting displacement of the rotor with respect to a plane which is perpendicular to the rotational axis of the rotor,
wherein 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.

2 more elements

Dependencies are inferred from the claim text.

Magnetic levitated motor

Life of this patent

Magnetic levitated motor

Life of this patent

Abstract

Claims15