Title:
回転電機及び車両用ファンモータ
Document Type and Number:
Japanese Patent JP3994010
Kind Code:
B2
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 commutator 26 of the fan motor for vehicle comprises twelve segments 24, and a pair of positive/negative brushes are press-contacted to the commutator 26. Among the segments 24, 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 segments 24 narrows 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.
Inventors:
Toshisuke Ito
Toshihiro Yano
Yousuke Natsume
Isamu Adachi
Shinmura Tetsuro
Toshihiro Yano
Yousuke Natsume
Isamu Adachi
Shinmura Tetsuro
Application Number:
JP2001582893A
Publication Date:
October 17, 2007
Filing Date:
May 10, 2001
Export Citation:
Assignee:
ASMO Co., Ltd.
International Classes:
H02K13/10; H01R39/04; H02K13/00
Domestic Patent References:
| JP4502400A | ||||
| JP11234969A | ||||
| JP1127357U | ||||
| JP59008458Y2 |
Foreign References:
| US4433263 | ||||
| US5497039 | ||||
| US1842340 |
Attorney, Agent or Firm:
Atsushi Nakajima
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda
Kato Kazunori
Katsuichi Nishimoto
Hiroshi Fukuda