The nature grade and adjustment method of carbon brush
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Release time:
2021.08.25
The spark nature of spark grade determines whether the unit can run 0 normal operation without spark 1 about 1/4 of the carbon brush has no harm to the successive operation of the carbon brush due to a small part of its small cremation points. therefore, it is considered that there is no spark reversal in practice, and about half of the carbon brushes are allowed to have fine sparks 3 all or most of them show black marks on the slip ring and traces on the carbon brush during the successive operation, this spark is allowed to exist when it is temporarily overloaded and started to change direction. Please stop and deal with it. 4 All carbon brushes will generate considerable sparks. Work is not allowed. Operation is not allowed.
The carbon brush of the motor and the carbon brush of the generator are also collectively referred to as the motor carbon brush or the motor brush. The commutator is composed of a brush and a commutation ring, and the carbon brush is a kind of brush. Because of the rolling of the rotor, the brush has always been in conflict with the commutation ring, and spark erosion will occur at the moment of commutation, so the brush is a vulnerable part in the DC motor.
The effect of motor carbon brushes in the motor:
1. Add the external current (excitation current) to the rolling rotor (input current) through the carbon brush. 2. Introduce the electrostatic charge on the large shaft into the ground (grounding carbon brush) (output current) through the carbon brush. 3. Change the current direction (in commutator motor, the brush also plays a commutation effect). 4. Lead the large shaft (ground) to the protection equipment for rotor grounding protection and measure the positive and negative ground electricity of the rotor.
Natural running-in method equipment process: power failure admission> removal of old carbon brushes> removal of old carbonized film (this operation is required when replacing carbon brushes of different materials or when the carbonized film is too thick)> cleaning the inside of the motor> new carbon brushes of equipment> equipment viewing> natural running-in (about 0.5-3 hours, depending on the size and size)> completion
Manual running-in method equipment process: power failure admission> removal of old carbon brushes> new carbon brushes of equipment> running-in operation> removal of old carbonized film (this operation is required when replacing carbon brushes of different materials or when the carbonized film is too thick)> cleaning inside the motor> equipment review> completion
East-West running-in method equipment process: power failure admission> removal of old carbon brushes> new carbon brushes of equipment> equipment viewing> film removal (this operation is required when replacing carbon brushes of different materials or when the carbonized film is too thick) and running-in operation> equipment viewing> complete.
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