In order to make better use of electrical products, you must learn more about all aspects of the product. The same applies to DC geared motors. Next, the manufacturer of the DC gear motor will introduce the commutation technology of the DC gear motor.
The commutation defect of the DC geared motor mainly means that the commutation spark under the brush exceeds the standard. During normal operation, the surface of the commutator should be bright and there should be a dark brown cuprous oxide maintenance layer. The maintenance layer can increase the contact resistance between the brush and the commutator and reduce the short-circuit current under the brush. There is no need to maintain the commutator, and then the working conditions of the commutator can be improved and sparks can be reduced. Why are most brush motors are small power tools?
Assuming the following conditions exist in the surrounding environment, the reverse spark will increase, which will increase the wear of the brushes and commutator: there is no satisfactory oxygen in the air, and no good oxidation can be formed on the surface of the heat exchanger Membrane commutator; the air temperature is too high. The surface of the commutator is not easy to form an oxide film. The air contains corrosive gas and dust, which will damage the formed oxide film, cause difficulty in commutation and increase brush wear.
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