Commutator and brush materials for small electric motor,...

Details Commutator and brush materials for small electric motor,... Commutator and brush materials for small electric motor,...

2011-01-25

2011-01-25

Zimmerman, John J (Department: 1784)

Electrical generator or motor structure

Dynamoelectric

Rotary

C428S672000, C428S673000, C428S929000, C420S504000

Reexamination Certificate

active

07876017

ABSTRACT:
An object of the present invention is to provide a commutator or brush material for a small electric DC motor which enables a lengthened operating life of a spindle motor for a DVD controlled using a pulse current. A commutator material for a small electric DC motor in accordance with the present invention is characterized by being composed of 6.0 to 10.0 wt % of Cu, 1.0 to 5.0 wt % of ZnO, and a balance of Ag and in that Cu metal particles and ZnO particles are dispersed in an AgCu matrix. A brush material for a small electric DC motor in accordance with the present invention is characterized by being composed of 0.1 to 5.0 wt % of MgO and a balance of Ag and in that MgO particles are dispersed in an Ag matrix, or is characterized by being composed of 5.0 to 15.0 wt % of Ni and a balance of Pt and in that Ni is dissolved in a Pt matrix.

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Abstract for CN 1635582 A, Jul. 6, 2005.
English translation of JP 58-084951. May 1983.
English translation of JP 59-016219. Jan. 1984.

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