Possible Problems of Carbon Brush of Electric Tools in Operation
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Release time:
2021.08.25
Carbon Brush of Electric Tool-Questions and Elements that Carbon Brush May Present in Unit Work 1. Carbon Brush of Electric Tool Wear Severe. The main elements that constitute the severe wear of carbon brushes are the following:
a. Surface finish of slip ring. The higher the surface finish of the slip ring, the smaller the conflict coefficient and the lower the wear rate of the carbon brush;
B. The impact of carbon brush data. Different manufacturers, different types of carbon brush composition structure is not the same, the wear rate is not the same. Selecting the same kind of carbon brush can reduce the imbalance of the wear rate of the carbon brush itself, so the carbon brush with the same trademark should be selected when replacing the carbon brush;
c. Effect of tension spring pressure. If the tension spring pressure is too large, the mechanical wear of the carbon brush of the electric tool will increase; if the tension spring pressure is too small, although the conflict between the carbon brush and the slip ring is small, the poor touch will cause sparks, which is not desirable;
d. Effect of current. Generally, for graphite carbon brushes, the current flowing through the positive carbon brush is greater than the current flowing through the negative carbon brush, so the wear of the positive carbon brush is greater than that of the negative carbon brush, and the wear of the positive slip ring is greater than that of the negative slip ring.
2. The carbon brush is on fire. The main elements that constitute the carbon brush fire are the following:
a. Due to the excessive current flowing through the carbon brush;
B. Due to the jamming of the carbon brush, it is caused by touching the slip ring one after another.
3. The temperature of carbon brush is high. The elements that constitute the high temperature of the carbon brush of the power tool are mainly the following:
Excitation system overload;
B. The touch surface of carbon brush and slip ring is small;
c. The quality of the carbon brush itself is in doubt.
4. The carbon brush is severely damaged. The main elements of the carbon brush damage are the following:
a. High temperature of carbon brush;
B. The carbon brush is not polished well;
c. The unit oscillates greatly, and the carbon brush is jammed in the brush holder;
D. carbon brush quality is poor.
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