Carbon Product
AssigneeJohnson Electric S.A.
InventorsJing Chao ZHENG, Yiu Chung WU, Chi Man LAW, Xiu Xian WANG
Life of this patent
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Abstract
A carbon product is made of mesocarbon microbeads and graphite. Preferably, the weight percent of mesocarbon microbeads is 50-99% and the weight percent of graphite is 1-50%. Preferably, when the graphite is carbon-graphite, the carbon product has a density in the range of 1.6-1.8 g/cm3 and a resistivity in the range of 2000-8000 μΩ·cm. Preferably, when the graphite is electro-graphite, the carbon product has a density in the range of 1.85-1.95 g/cm3 and a resistivity in the range of 500-2000 μΩ·cm. The carbon product may be a carbon brush, a carbon bearing, a carbon seal or a brush contact member for a commutator of an electric motor.
Claims19
A commutator for an electric motor, comprising:
- a base made of insulation material;
- an electrically conductive member fixed to the base, the electrically conductive member comprising a plurality of bars each with a tang for connection of a lead wire of the motor;
- and
- a contact member forming a brush contact surface, the contact member comprising a plurality of segments each electrically connected with a corresponding bar, the contact member comprising mesocarbon microbeads and graphite.
A method of making a carbon product, comprising:
- mixing mesocarbon microbeads and electrographite;
- iso-static pressing the mixed mesocarbon microbeads and electrographite to form a blank;
- sintering the blank;
- graphitizing the sintered blank;
- and
- machining the graphitized blank to form a predetermined shape of the carbon product.
A method of making a carbon product, comprising the steps of:
- mixing together powdered mesocarbon microbeads and powdered carbon-graphite;
- kneading the mixed mesocarbon microbead and graphite powder;
- compressing the mixed powder to form a blank;
- sintering the blank;
- and
- machining the sintered blank to form the carbon product.
A carbon product made of mesocarbon microbeads and graphite, wherein the weight percent of mesocarbon microbeads is 50-99% and the weight percent of graphite is 1-50%.
Dependencies are inferred from the claim text.