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:
Aug. 14, 2012
Filed:
Feb. 27, 2009
Applicants:
Shekhar Kubal, Vaasa, FI;
Stefan Strandberg, Vörá, FI;
Ahti Rauma, Vaase, FI;
Inventors:
Assignee:
Vacon Oyj, Vaasa, FI;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 5/00 (2006.01); H02P 5/46 (2006.01);
U.S. Cl.
CPC ...
Abstract
Method and arrangement for connecting an AC electric motor (M, M, . . . M) to an AC electricity network (L) in a system which comprises a frequency converter (FC), with which the motor is started, and contactors (S, S, S, S, S, S), in which method the supply source is changed by means of the contactors from the frequency converter to a direct network supply, in which method the frequency converter is stopped before changing the supply source, and in which method in connection with changing the supply source the control of the contactors is started before stopping the frequency converter.