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:
Feb. 08, 2000
Filed:
Jan. 30, 1997
Yasushi Maejima, Narashino, JP;
Seiko Seiki Kabushiki Kaisha, , JP;
Abstract
To prevent the problem of dragging on an auxiliary bearing which tends to occur in a motor in the vicinity of a resonance point of rigid mode during the start-up of a three axis control magnetic bearing apparatus, a radial position correcting electromagnet is provided. The radial position correcting electromagnet has a magnetic pole extending in the direction of a radius of a metal disc of the motor through which the motor shaft passes. A voltage having a short period is applied to the radial position correcting electromagnet at a plurality of times in the vicinity of the resonance point of rigid mode upon start-up of the motor to attract the metal disc and thereby adjust the radial position of the shaft to prevent excessive contact between the shaft and other parts of the three axis control magnetic bearing apparatus.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile