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:
May. 07, 1991
Filed:
Feb. 09, 1990
Applicant:
Inventors:
Alfred Grassl, Richterswil, CH;
Erhard Knorr, Wiesloch, DE;
Assignee:
Kontron Instruments Holdings NV, Schottegatwegoost, AN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
388843 ; 318274 ;
Abstract
In a shunt wound d.c. motor for driving centrifuges, an apparatus for obtaining smooth acceleration by regulating the bottom speed range in accordance to a preset slope current and then accelerating the armature current with full excitation. Smooth braking is also achieved by applying to the field current the full excitation during deceleration and a preset slope current thereafter.