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:
Feb. 17, 1998
Filed:
Oct. 25, 1996
Stefan Kunzel, Erlangen, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A process and device for field-oriented control of a polyphase machine, where a torque-producing quantity is regulated via a speed control circuit and a flux-producing quantity is regulated via a field control circuit that determines the magnitude and angle of the flux. The flux magnitude is injected through the field control circuit. Orientation errors in the field axis are corrected through frequency adjustment, specifically by adjusting the slip frequency according to the difference between the transformation angle used and the flux angle. The voltages and currents that create the rotational field of the machine are generated via a current control circuit in accordance with the corrected reference values.