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Carbon brushes are available in four main grade categories: carbon graphite, electrographitic, graphite, and metal graphite. [3] The term brush remains in use. Since the brushes wear out, they can be replaced in products intended to allow maintenance. During World War II, high–altitude aircraft generators had very rapid brush wear, requiring ...
At the same time, Le Carbone, founded in 1892 in Paris, produced brushes for electric motors. In 1893, Charles Street, an engineer at Le Carbone, discovered and patented the process of carbon graphitization which allowed the manufacture of synthetic graphite. [2] He patented his idea under the title « Continuous electric furnace system » [3]
Natural graphite has found uses in zinc-carbon batteries, electric motor brushes, and various specialized applications. Railroads would often mix powdered graphite with waste oil or linseed oil to create a heat-resistant protective coating for the exposed portions of a steam locomotive's boiler, such as the smokebox or lower part of the firebox ...
Carbon brushes tend to wear more evenly than copper brushes, and the soft carbon causes far less damage to the commutator segments. There is less sparking with carbon as compared to copper, and as the carbon wears away, the higher resistance of carbon results in fewer problems from the dust collecting on the commutator segments.
High Temperature Applications: Graphite components for industrial furnaces, crucibles for silicon production, atom absorption spectrometry (AAS) cells, components of fiber-reinforced carbon (FRC), etc. Small Motor Technology: Carbon brushes and holder systems for electric motors in household appliances and power tools.
However, if a two-pole motor were designed to do actual work with several hundred watts of power output, this shorting could result in severe commutator overheating, brush damage, and potential welding of the brushes—if they were metallic—to the commutator. Carbon brushes, which are often used, would not weld.