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. 21, 1993
Filed:
Jun. 18, 1991
Mai X Tu, Chavannes, CH;
Michel Schwab, Bienne, CH;
Detra SA, Bienne, CH;
Abstract
Method of supplying power to a single phase step motor of a time-piece, adapted to provide the motor with chopped voltage pulses of time-period T.sub.6 variable with respect to the load conditions and to the supply voltage of the motor, characterized in that each said impulsion of chopped voltage is composed of a sequence of elementary pulses of the same polarity and of a constant duration T.sub.4, and in that the durations T.sub.5i separating the said elementary voltage pulses vary according to load conditions and according to the supply voltage of the motor variable with respect to the load conditions and to the supply voltage of the motor. The invention finds a field of application in motors for time-pieces.