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. 04, 1989
Filed:
Jan. 30, 1987
Applicant:
Inventors:
Kurt Heinz, Buchs, CH;
Johannes Felber, Dietikon, CH;
Assignee:
Willi Studer AG, Regensdorf, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02D / ;
U.S. Cl.
CPC ...
318318 ; 318326 ; 3183 / ;
Abstract
An inexpensive and reliable regulating apparatus contains between a regulating unit and an electric motor series-connected therewith a feedback path for a single tachometer signal and including a band-pass filter. The band-pass filter determines the operating range of the electric motor. The regulating unit is constructed such that during operation the electric motor is supplied with power only when a signal from the feedback path arrives at the regulating unit. Under the action of external disturbances the supply of power is interrupted at least for a predetermined duration of time.