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:
Apr. 17, 2001
Filed:
Feb. 07, 2000
Applicant:
Inventors:
Masaki Gotoh, Nagano, JP;
Takashi Wakabayashi, Nagano, JP;
Assignee:
Kabushiki Kaisha Sankyo Seiki Seisakusho, Nagano, JP;
Primary Examiner:
Int. Cl.
CPC ...
H02M 1/12 ;
U.S. Cl.
CPC ...
H02M 1/12 ;
Abstract
A PWM driving circuit for a brushless motor is provided on an insulating film formed on a base board made of metal. Grounding the base board, filter condensers are formed between the base board and wiring patterns in which driving currents for the driving coils flow. The capacitances of the condensers are optimized by adjusting the film thickness of the insulating film or by changing the shapes of the wiring patterns or the like.