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:
Sep. 15, 1987
Filed:
May. 03, 1985
Wilhelm Reinhardt, Schrozberg-Guetbach, DE;
Helmut Lipp, Hohebach, DE;
Abstract
A protection circuit for stalling protection in commutatorless direct current motors is driven by Hall generators, in particular Hall IC's. A respective semiconductor circuit element (5, 14) disposed in series with each stator winding (1, 2) is turned on or off in dependence on a control voltage induced in the stator windings (1, 2). The control voltage (U.sub.B) is constituted by the sum of the operating voltage in the unenergized windings (1, 2) and the counter-e.m.f. induced in these windings, whereby, if the sum of these voltages is greater than the operating voltage, the semiconductor circuit element (5, 14) connected to the respective energized winding (1, 2) is turned on, and, if the counter-e.m.f. is zero or falls below a predetermined cut-off value, the respective semiconductor circuit element (5, 14) is turned off.