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:
Nov. 20, 2001
Filed:
Aug. 18, 2000
Hideki Kanebako, Nagano, JP;
Yohji Okada, Ibaraki, JP;
Kabushiki Kaisha Sankyo Seiki Seisakusho, Nagano, JP;
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.