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:
Sep. 29, 1981
Filed:
May. 02, 1979
Applicant:
Inventor:
Yoshio Kishi, Hachiouji, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310 78 ; 310156 ; 310268 ;
Abstract
A flat drive motor, operative to transmit torque from a rotor to a drive shaft uses the attraction of a rotor magnet for a magnetic material to apply a fixed normal force to an integral friction clutch. When overloaded, the friction clutch slips with a controlled friction proportional to the normal force to prevent the development of excessive torque and to permit the rotor to turn at a normal speed while the drive shaft is slowed or stopped to prevent excessive current in the motor drive coils.