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:
Mar. 01, 1994
Filed:
Apr. 08, 1992
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A DC commutatorless motor in which one pulse is generated per one revolution is disclosed. The motor comprises: three-phase stator windings; a rotor having 2n magnetic poles (where n is a natural number of 2 or more), a portion of one of the magnetic poles having a magnetic property different from that of said one magnetic pole; three detection devices disposed in the vicinity of said rotor, the detection devices being responsive to a magnetic field generated by the magnetic poles and the portion; first to third amplifiers for amplifying respectively the outputs of the three detection devices; first to third subtracting circuits for obtaining respectively the difference of the outputs of two of the first to third amplifiers; an adding circuit for adding the outputs of the first to third subtracting circuits; and a signal circuit for generating a pulse per one revolution of he rotor on the basis of the output of the adding circuit.