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. 27, 2012
Filed:
Jul. 12, 2010
Ralph Wystup, Künzelsau, DE;
Helmut Lipp, Dörzbach-Hohebach, DE;
Ralph Wystup, Künzelsau, DE;
Helmut Lipp, Dörzbach-Hohebach, DE;
EBM-Papst Mulfingen GmbH & Co. KG, Mulfingen, DE;
Abstract
The present invention relates to a method and a system for controlling a permanent magnet excited, brushless, electronically commutated, three-phase electric motor () wherein a single-phase main AC voltage (U) having a mains frequency (f) is rectified and supplied to an inverter () via a slender intermediate circuit () containing no, or minimum, intermediate circuit reactance as intermediate circuit voltage (U) pulsating at double the mains frequency (2f) which is actuated for powering and commutating the electric motor (). Control takes place by means of a field-oriented current-space vector regulator, wherein a q-current (i) as torque-forming component of the current-space vector (i) is regulated perpendicularly to the permanent magnetic field and a d-current (i) can be regulated as a field-influencing component of the current-space vector (i) in the direction of the permanent magnet field. In this case, dynamic field attenuation occurs, wherein the d-current (i) in the negative range is defined with a sinusoidal profile and at double the main frequency (2f) and wherein the d-current (i) is regulated according to its phase position and its amplitude such that ripple of the q-current (i) is minimized. Since the q-current as torque forming component is proportional to the torque, thus the torque ripple is also minimized, in spite of the strongly pulsating intermediate circuit voltage (U).