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:
Jul. 10, 1984
Filed:
May. 25, 1983
Kinzo Wada, Yokohama, JP;
Abstract
A driving circuit for a D.C. commutatorless motor comprises a rotor having a permanent magnet, a pair of Hall elements stator coils positive and negative power sources, power switching elements, where each of the stator coils has one terminal thereof grounded and the other terminal thereof coupled to the positive power source through one of the power switching elements and to the negative power source through another power switching element, a differential switching circuit for switching each of output terminals of the Hall elements with a difference of approximately .pi./2 radians in phase by an output signal thereof, and a difference signal producing circuit coupled between the power switching elements and the differential switching circuit, for producing a signal in accordance with a difference between two output signals having a difference of approximately .pi. radians in phase obtained from the differential switching circuit. A current in accordance with the signal from the difference signal producing circuit is applied to the respective stator coils.