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. 18, 1985
Filed:
Jul. 14, 1983
Tokyo Shibaura Denki Kabushiki Kaisha, Kawasaki, JP;
Abstract
A shaft is fixed within a motor housing in an electric motor unit. The shaft is provided with bearing sections having herringbone-shaped grooves formed therein. The shaft is inserted into a hollow cylindrical spindle and the journal sections in the smooth inner surface of the spindle are allowed to face the bearing sections so as to constitute a dynamic pressure type radial bearing supporting the spindle in the radial direction. Stator ring magnets are fixed to the motor housing, and rotor ring magnets are fixed to the hollow cylindrical shaft. The inner surface of the stator magnets faces the outer surface of the ring magnets. These magnets are magnetized such that the mutually facing regions have opposite magnetic poles. The stator and rotor magnets form a magnetic thrust bearing; that is, the spindle is suspended by the attractive force generated between the magnets.