The traction motor carbon brush

There are some differences between with traction motor carbon brushes and other carbon brushes. Traction motor brush is affected strongly by external factors(when rolling in trolley and tracking) and internal factors(load changing; starting and braking). And traction motor carbon brush are running time and again in gaseous environment. So machine strength, commutation ability and contact stability and abrasion resistance all are very important to the traction motor carbon brush. Therefore, the traction motor carbon brush's stability in the great extent is the basic principle for the traction motor. That is to say, it should more easier for the traction motor carbon brush to form commutator surface pellicular. And at the same time it also need the traction motor carbon brushes to be very cheap and low friction. General speaking, the material and their combination is one of very important point.

To improve the efficiency and capability of electric motors, it is very important to test the carbon brushes' characteristic. It is necessary to point out that there is no consequence if we test the carbon brushes with alienated reality method. That is to say, we have to test the carbon brushes in reality method. We also can get a lot of data by former test. But now we apply many kinds of methods to test the general characteristic, such as: mechanics, calorifics, optics, electrics, acoustics,physic characteristics and chemic characteristics,etc. We should set our the following characteristics: the specifications of carbon brushes; pocess precision; the strength of brush wire; the resistance of riveting position; resistivity; hardness; ash content; bulk density; the rate of air hole; compressive strength; modulus of elasticity; the rate of attrition; impact strength; current density; sliding contact characteristics, etc. Beside, the traction motor carbon brushes have added the most important functional performance, such as, commutation ability, the current distribution ability, sliding contact ability and the attrition ability between carbon brush and commutators.