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. 21, 2006
Filed:
Jun. 18, 2004
Hiroki Kinukawa, Kusatsu, JP;
Tatsuo Okamoto, Nagaokakyo, JP;
Hiroki Kinukawa, Kusatsu, JP;
Tatsuo Okamoto, Nagaokakyo, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An amplitude regulation circuit which includes a maximum detection circuit which outputs a maximum signal MAX that is distorted to some extent during and around a time when a highest-level signal switches between signals V, V, and V. The amplitude regulation circuit also includes a minimum detection circuit which outputs a minimum signal MIN that is distorted to some extent during and around a time when a lowest-level signal switches between signals V, V, and V. Such distortions reduce variations in amplitude detection signal AMP that represents a difference between MAX and MIN. The amplitude regulation circuit amplifies rotor position signals Hto Hbased on amplitude detection signal AMP according to AGC, thereby maintaining amplitudes of signals Vto Vconstant while maintaining sinusoidal waveforms.