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. 09, 2004
Filed:
Feb. 20, 2002
Takatoshi Sakata, Yamatotakada, JP;
Yasuo Yokoi, Hirakata, JP;
Other;
Abstract
A method for controlling starting of a synchronous motor having an excellent starting ability and capable of coming into a commutation mode in a short time is provided. An AC current having a predetermined frequency is supplied to a field coil of a synchronous motor by an inverter thereby starting the synchronous motor By detecting a terminal voltage of the field coil of the synchronous motor at the starting time, and decreasing a voltage waveform component based on the AC current supplied by the inverter from the detected voltage, the waveform is corrected so that the voltage waveform component based on the counter electromotive force can be confirmed ( ). And after integrating the corrected waveform ( ) and converting the same into a square wave ( ), a phase difference between the same ( ) and an output of a 120° energization waveform generating circuit is detected to be fed back.