Determination of brush wear value
Brush wear value test is an important technical index for judging the service life of a motor brush. The brush wear value tested can also provide a reference for choosing the proper replacement brush. It has important application value in the electric motor brush industry, and has been widely used. This article will introduce the method of brush wear value determination, in order to help readers better master and use this index.
The brush wear value test is to measure the brush contact area of the commutator under certain load. The brush wear value is generally expressed by the area of the contact surface. For a motor brush, its contact area with the commutator decreases with the wear degree of the contact surface, resulting in greater drop of brush voltage, accelerated increase of electric wear of the brush and even brush burning. Therefore, when the brush wear degree reaches a certain value, the motor must be stopped for brush replacement.
The most commonly used method to determine the brush wear value is to use a brush wear measuring device. Before measuring the brush wear value, it is necessary to adjust the current in the testing circuit to the rated value. When the current is stable,the brush wear value is measured. After that, Record the intial brush wear value, as well as the brush voltage. Then, adjust the current in the circuit to a certain degree, and measure the brush wear value and brush voltage again. This process should be repeated until the brush voltage drops significantly or the brush wear value reaches the specified value.
In addition, it should be noted that it is important to correctly use the brush wear measuring device to determine the brush wear value. The measurement should be done according to the operation instruction of the device. If the brush wear value is not within the specified range, it is necessary to timely replace the motor brush.
In conclusion, brush wear value test is an important technical index for judging the service life of a motor brush, and is widely used. When carrying out the test, the appropriate measuring device should be chosen and used properly according to the operation instruction. When the brush wear value is not within the specified range, brush replacement service is necessary.
