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:
Nov. 01, 2011
Filed:
Dec. 17, 2008
Applicants:
Hidenori Ishihara, Hamamatsu, JP;
Hiroaki Yamamoto, Toyohashi, JP;
Nakatsune Shirai, Iwata, JP;
Katsumi Endo, Kosai, JP;
Tomoki Yamashita, Hamamatsu, JP;
Inventors:
Hidenori Ishihara, Hamamatsu, JP;
Hiroaki Yamamoto, Toyohashi, JP;
Nakatsune Shirai, Iwata, JP;
Katsumi Endo, Kosai, JP;
Tomoki Yamashita, Hamamatsu, JP;
Assignee:
Asmo Co., Ltd., , JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02P 6/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A motor controller that outputs a drive signal to a direct-current motor to drive the motor is provided. The motor controller includes a drive circuit that generates the drive signal. The drive circuit superimposes on a direct-current voltage an alternating-current component having a frequency in the audible frequency range of the human ear, thereby generating the drive signal.