As we all know, the function of the commutator itself in the motor is not only related to the brush, but also the heat exchange, especially for the short-term or intermittent constant motor, the function of the heat dissipation function in the commutator. It accounts for a large proportion. The heat source of the commutator comes from the current flowing through the commutator, the brush, and the sliding contact between the two. However, the temperature rise of the commutator depends on the size of the heat source and the heat capacity of the commutator and the heat dissipation conditions of the surface.
For a motor that has already been manufactured, the heat capacity and heat dissipation conditions are constant. Therefore, the only way to solve the temperature rise of the commutator is to reduce the heat source and reduce the friction loss between the brush and the commutator. Contact electrical losses.
The friction between the brush and the commutator is related to the frictional loss in the relative motion of the brush. If you want to reduce this part of the loss, the way out is to reduce the friction coefficient of the brush. The electrical contact loss of the brush is equal to the voltage drop of the brush multiplied by the current flowing through the brush; to reduce this loss, the method can only reduce the contact voltage drop of the brush.
In addition to the above two losses, the other loss is related to the allowable current density of the brush. The friction loss and electrical contact loss of the above brushes are calculated on the assumption that they are on a certain premise.
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