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:
Sep. 08, 2009
Filed:
Nov. 30, 2005
Hirotake Hamamatsu, Nagoya, JP;
Youichi Murakami, Ama-gun, JP;
Ryoichi Honbo, Obu, JP;
Kenzo Kiyose, Takahama, JP;
Mitsuo Ikeda, Matsusaka, JP;
Yoichi Sakaura, Matsusaka, JP;
Shinya Nakagawa, Watarai-gun, JP;
Makoto Nishio, Matsusaka, JP;
Hirotake Hamamatsu, Nagoya, JP;
Youichi Murakami, Ama-gun, JP;
Ryoichi Honbo, Obu, JP;
Kenzo Kiyose, Takahama, JP;
Mitsuo Ikeda, Matsusaka, JP;
Yoichi Sakaura, Matsusaka, JP;
Shinya Nakagawa, Watarai-gun, JP;
Makoto Nishio, Matsusaka, JP;
Denso Corporation, Kariya, Aichi-Pref., JP;
Tris, Inc., Matsusaka, Mie-Pref., JP;
Abstract
In a commutator of a rotary electric machine, each of commutator segments has 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. The low-resistive material contains a carbonic material and a binder. The high-resistive material contains a carbonic material, a binder and an inorganic substance such as boron nitride. A mixing ratio of the inorganic material to the high-resistive material is more than 20 wt %. Alternatively, a brush, which makes contact with the commutator segments, can have the high-resistive layer and the low-resistive layer.