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:
Apr. 17, 2001
Filed:
Oct. 26, 1999
Masayoshi Nakagawa, Niigata-ken, JP;
ALPS Electric Co., Ltd., Tokyo, JP;
Abstract
Within a three-phase motor M, there are mounted one chip-shaped magnetoresistance effect element sensors comprising magnetoresistance effect elements having a spin-valve structure in series connected. The driving signal generating means generates difference signals obtained by subtracting output signals from each of the magnetoresistance effect element sensors. The phase current supplying means generates phase currents on the basis of the difference signals, and supplies these to driving coils for each phase respectively. The magnetoresistance effect element sensor is more excellent in temperature characteristic than the hole element, and is also high in output level, and therefore, the rotational speed and phase of the three-phase motor can be maintained with high accuracy.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile