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. 24, 1981
Filed:
May. 23, 1979
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02K / ;
U.S. Cl.
CPC ...
310113 ; 310138 ; 310156 ; 310266 ;
Abstract
A rotational speed signal sensor for a motor having a rotating permanent magnet as a rotor. One cylindrical surface of a hollow cylindrical rotating magnet has a series of magnetic poles which coact with the stator windings so as to produce the torque while the other cylindrical surface of the rotating magnet has a series of magnetic poles which coact with a sensor coil so as to derive the rotational speed signal.