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. 08, 2011
Filed:
Oct. 17, 2008
Lothar Rehm, Herrenberg, DE;
Thomas Raumer, Stuttgart, DE;
Lothar Rehm, Herrenberg, DE;
Thomas Raumer, Stuttgart, DE;
Daimler AG, Stuttgart, DE;
Abstract
In a control system and a method for operating a permanent-magnet electrical machine, when the electrical machine is switched off after one of a functional computer and a monitoring computer of the control system has identified a fault, in order to reduce the braking torque of the electrical machine, which is switched-off but still rotating an output stage of the control system is subjected to a three-phase short circuit if the rotation speed Ddoes not fall below a definable limit value GRor if a voltage U_DC of the output stage () exceeds a limit value Umax, and when the rotation speed Dis below the definable limit value GRand a voltage U_DC of the output stage does not exceed a limit value Umax, all the circuits breakers () of the output stage () are opened in order to fully disconnect the electrical machine from the output stage.