For the commutation problem of the chassis permanent magnet DC motor for chassis, first we will consider the cooperation of the brush and the commutator. At present, there are many types of brushes. On the basis of the original graphite base and copper base, various substances are added according to the application, such as: adding silver to improve the electrical conductivity of the brush and prolonging the life of the brush; adding some in the brush Lubricating substances can reduce the friction between the brush and the commutator; brush plating and the like.
In the commutator, most of the commutator segments are made of electrolytic copper. Other alloy materials are added to change the electrical conductivity and the hardness of the commutator. The film is mainly insulated by mica, with and without slots. Points. The problem of the cooperation between the brush and the commutator is a problem that the technician of the permanent magnet DC motor for chassis of the brushed chassis constantly studies. It can be studied from the aspects of hardness and material of the two.
If the hardness of the brush is high, the wear of the commutator may be higher than that of the brush during the operation of the permanent magnet DC motor for chassis of the chassis; and if the hardness of the commutator is too high, the brush wear may be more severe. phenomenon. For motor designers, a variety of commutators and brushes are often used, combined with experimental analysis to observe the commutating sparks of the motor, the wear of the brushes and commutators, and then according to the use of the motor and the life of the motor. Noise and other requirements to determine the brush and commutator fit, choose a relatively suitable fit.