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:
Jul. 03, 2012
Filed:
Jun. 21, 2010
Ralph Wystup, Künzelsau, DE;
Helmut Lipp, Dörzbach-Hoheback, DE;
Ralph Wystup, Künzelsau, DE;
Helmut Lipp, Dörzbach-Hoheback, DE;
EBM-Papst Mulfingen GmbH & Co. KG, Mulfingen, DE;
Abstract
The present invention relates to a method and a control system for driving a three-strand brushless, electronically commutated electric motor (), wherein a line AC voltage (U) is rectified and fed via a slim DC link () with minimum DC link reactance as a DC link voltage (U) to an inverter () that can be driven to supply and commutate the electric motor (). A pulsating DC voltage (U) initially generated by rectifying the line AC voltage (U) is dynamically increased with respect to its instantaneous values by a step-up chopper () in such a manner that the resulting DC link voltage (U) with a reduced ripple always lies above a defined limit voltage (U/U) over time. The control system consists of a network rectifier (), a downstream slim DC link () with minimum DC link reactance and a controllable inverter () that can be supplied via the DC link and driven to commutate the electric motor (). A step-up chopper () is integrated therein with a controller () designed in such a manner that, the pulsating DC voltage (U) rectified by the network rectifier () is dynamically increased with respect to its instantaneous values in such a manner that the resulting DC link voltage (U) with a reduced ripple always lies above a defined limit voltage (U/U) over time. Stray inductances (Ls-Ls) of the motor winding heads present in the electric motor () are used as inductor (L) for the step-up chopper ().