The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 2004
Filed:
Apr. 19, 2002
Hideki Kanebako, Nagano, JP;
Yohji Okada, Ibaraki, JP;
Sankyo Seiki Mfg., Ltd., Nagano, JP;
Abstract
A magnetic levitation motor has a rotor with a rotor magnet magnetized in multiple poles, and a stator with rotor driving coils disposed confronting to the rotor magnet for generating a rotational torque on the rotor, and bearing coils for generating a bearing force in a direction perpendicular to a rotational axis of the rotor. The rotor driving coils and the bearing coils 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.