Introduction of end carbon commutator

The use of carbon and carbon compounds to manufacture DC motor commutators was studied by German scientists as early as World War II.
After the defeat of Germany, German scientists were captured by the US military and entered to continue their research.
But when the brushless motor came out, it gained attention with its long life. Research work on end carbon commutators has been delayed for some time.
After the automobile adopts the EFI device, the fuel pump cannot use the brushless motor due to the limitation of volume. The fuel pump of the EFI automobile is immersed in the fuel to work, and the gasoline currently produced and sold in my country has a relatively low sulfur content. High, copper commutator working surface, in addition to the burning of electric sparks when carbon brushes are commutated, it will also accelerate wear due to chemical corrosion of sulfur. Furthermore, in order to cope with the insufficient supply of fuel in the future fuel market and to control automobile exhaust pollution, the Chinese government has started to sell corrosive ethanol gasoline on a pilot basis. A joint test by the Chinese Academy of Sciences and Tsinghua University shows that the current additives in ethanol gasoline will cause strong corrosion to the metal commutator, resulting in a significant reduction in the service life of the car, and directly lead to various engine failures.

At this stage, the European Union and other countries have begun to formulate relevant standards, and have begun to promote and use electronic fuel pumps with end carbon commutators in their pump cores to replace copper and other metal commutators to extend the service life of fuel pumps. The era of widespread adoption of end carbon commutators in automotive fuel pumps has come.