| US 7,586,230 B2 | ||
| Brush, commutator, and commutator device | ||
| Hirotake Hamamatsu, Nagoya (Japan); Youichi Murakami, Ama-gun (Japan); Ryoichi Honbo, Obu (Japan); Kenzo Kiyose, Takahama (Japan); Mitsuo Ikeda, Matsusaka (Japan); Yoichi Sakaura, Matsusaka (Japan); Shinya Nakagawa, Watarai-gun (Japan); and Makoto Nishio, Matsusaka (Japan) | ||
| Assigned to Denso Corporation, Kariya, Aichi-Pref. (Japan); and Tris, Inc., Matsusaka, Mie-Pref. (Japan) | ||
| Filed on Nov. 30, 2005, as Appl. No. 11/289,642. | ||
| Claims priority of application No. 2004-345982 (JP), filed on Nov. 30, 2004; and application No. 2005-287714 (JP), filed on Sep. 30, 2005. | ||
| Prior Publication US 2006/0131983 A1, Jun. 22, 2006 | ||
| Int. Cl. H02K 13/00 (2006.01) | ||
| U.S. Cl. 310—251 [310/233] | 6 Claims |
| 1. A commutator having a plurality of commutator segments which make contact with a brush, each of the commutator segments
comprising:
a low-resistive layer made of a low-resistive material; and
a high-resistive layer made of a high-resistive material having a specific resistance higher than that of the low-resistive
material, wherein
the high-resistive material contains boron nitride, which has a specific resistance higher than that of the low-resistive
material, more than 20 wt % with respect to total weight of the high-resistive material.
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