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. 24, 2015
Filed:
Jan. 18, 2012
Daniel König, Gerabronn, DE;
Ralph Wystup, Künzelsau, DE;
Daniel König, Gerabronn, DE;
Ralph Wystup, Künzelsau, DE;
EBM-Papst Mulfingen GmbH & Co. KG, Mulfingen, DE;
Abstract
In a method and control system for controlling a brushless, electronically commutated electric motor (M), a three-phase source AC voltage (U) is rectified and fed to a DC link voltage (U), which is supplied to an inverter () via a slim DC link circuit (). A motor control unit () for PWM pulsing controls the inverter for commutating the electric motor (M) and adjusting the motor speed with a variable duty cycle (A). The duty cycle (A) is influenced by a compensating factor (k) such that the product of the DC link voltage (U) and a resulting DC link current (I) is kept constant in the link circuit (). The DC link voltage (U) is monitored. When a first threshold value (U) of an AC component (U) is exceeded, the compensating factor (k) is modified to lower the current AC component (U) below the threshold value (U).