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:
Nov. 22, 1983
Filed:
Nov. 23, 1981
Applicant:
Inventor:
Gediminas Bateika, Karlsruhe, DE;
Assignee:
Pfaff Haushaltmaschinen GmbH, , DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318331 ;
Abstract
A circuit is disclosed for controlling the speed of a motor having a constant magnetic field and supplied from an alternating current line source through a controllable semiconductor rectifier which utilizes a pair of series connected electronic switches each followed by storage capacitors. The switches are operated in phase opposition by the line frequency and followed by the input of a controller whose output is connected to a firing stage for firing the semiconductor rectifier.