A collector rings with the brush, when the brush is too strong, abrasive material collector ring is too soft, it often occurs on the collector ring is equivalent to the width of the ladder brush wear. Especially in high-temperature and low humidity totally enclosed motors, brushes, or more likely to cause excessive collector ring wear. Scar is formed by a ghost, at the beginning only a very small scars, brush collector poor in these parts to produce sparks. Once sparks wounds gradually deteriorated to expand, the final formation of the sliding contact surface with the brush the same size as the size of the scars. Thus, the collector ring brush even a very small sparks must also be noted.
Slip ring which performance requires concern?
electrical slip rings automation control system as an important component of its performance is directly related to the stability of the entire system is running, or even normal operation. Then slip ring performance which need to pay attention too? Insulation including loop insulation, wire insulation, insulation between the wire loops, the loop between the housing and the wire insulation, the insulation is of course the better, but it depends on the insulation material inside the slip ring. Usually require> 1000 megohms. Immunity slip ring to transmit dozens of different signals, high-frequency alternating current, high-voltage alternating current, high current AC, DC small signal weak, because the distance between the rings close to the signal transmission process will produce all kinds of interference , leading to transmission of information true. General magnetic interference, we use electromagnetic shielding; electrical interference, we use the electric field shielding, and other ways to reduce interference. Contact resistance contact resistance including dynamic and static contact resistance, is the sliding brush or a wire brush in contact with the metal ring between the resistor if resistance is too large, over-current will cause the slip ring heat, will also affect the results of information transmission. We need to contact rigorous screening material. Also require a smooth surface on the metal ring without scars.