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. 03, 2005
Filed:
May. 10, 2001
Toshimoto Ito, Toyohashi, JP;
Toshihiro Tanino, Hamamatsu, JP;
Yousuke Natsume, Toyohashi, JP;
Isamu Adachi, Hamamatsu, JP;
Tetsuro Shimmura, Toyohashi, JP;
Toshimoto Ito, Toyohashi, JP;
Toshihiro Tanino, Hamamatsu, JP;
Yousuke Natsume, Toyohashi, JP;
Isamu Adachi, Hamamatsu, JP;
Tetsuro Shimmura, Toyohashi, JP;
ASMO Co., Ltd., , JP;
Abstract
An electric rotating machine and a fan motor for vehicle are obtained, wherein variation width of current waveform resulting from occurrence of coils in a short circuit state is narrowed to reduce vibration and noise. A commutatorof the fan motor for vehicle comprises twelve segments, and a pair of positive/negative brushes are press-contacted to the commutator. Among the segments, at least one of pairs of segments that the brushes simultaneously contact have mutually different pitches. Therefore, timing when the coil in the short circuit state occurs at an armature and timing when the coil is released from the short circuit state of one brush deviate from those of the other brush temporally. Accordingly, the variation width of current waveform of electric current supplied to the coil connected to the pair of segmentsnarrows at least. As a result, the vibration of the electric rotating machine, variation of rotating torque, and the noise are considerably reduced, and life thereof is thus extended as well.