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:
Feb. 06, 1979
Filed:
Apr. 22, 1977
Roland Sudler, Frankfurt am Main, DE;
Quartz-Zeit AG, Frankfurt am Main, DE;
Abstract
A single phase stepper motor is formed of a rotor having a shaft carrying a driving pinion and a permanent magnet and a stator having a body of diamagnetic or paramagnetic material, a field winding producing an excitation field transverse to the axis of the rotor shaft and a pair of diametrically opposed auxiliary poles spaced from the excitation field. The permanent magnet is constructed of a lanthanide ferromagnetic alloy, such as a lanthanide cobalt alloy and preferably a samarium cobalt alloy; and the permanent magnet has a moment of inertia substantially the same as or less than the moment of inertia of the combination of the rotor shaft and the driving pinion. The stator body has a plurality of pairs of holes therein for supporting a U-shaped, rod-like member having ends forming the auxiliary poles in a plurality of positions to permit adjustment of the direction of rotation and torque of the rotor.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile