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:
May. 02, 2006
Filed:
Sep. 29, 2004
Jukka-pekka Makinen, Helsinki, FI;
Pekka Haapamäki, Kerava, FI;
Tero Halkosaari, Lempäälä, FI;
Vacon Oyj, Vaasa, FI;
Abstract
A method and a system for controlling parallel-connected frequency converters or inverter units feeding an alternating-current motor (MOTOR) provided with parallel windings or separate parallel motors having their shafts mechanically coupled together via a load, in which method the current supplied to the motor is measured. The frequency converters/inverter units are connected to each other via a data bus, e.g. a fast serial bus, and one of the frequency converters/inverter units (FCONor INU) functions as a master device in such manner that it sends to the other device/devices (FCONor INU) information over the data bus regarding the instantaneous value of the current (I) fed by it to the motor, said other devices functioning as follower devices so that they adjust their own current (I) on the basis of the current of the master device.