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:
Mar. 22, 1994
Filed:
Jan. 07, 1993
Kai Albrecht, Heidelberg, DE;
Helmut Meyer, Weinheim, DE;
Heidelberger Druckmaschinen AG, Heidelberg, DE;
Abstract
A method for regulating a motor current in phase windings of a brushless d.c. motor, wherein current is applied to the phase windings individually via an electronically controllable, d.c.-voltage intermediate-circuit converter with switchable semiconductor valves and respective freewheeling diodes connected in parallel with each thereof in individual bridge arms, and an actual value of the motor current is measured exclusively in the d.c.-voltage intermediate circuit, includes switching off, in a motor mode of operation, only one switchable semiconductor valve of the energized bridge arms for a period of time dependent upon the rotational speed of the motor when a reference value of the motor current is reached.