Carbon brushes and generator slip rings do not refer to the same thing.
As a sliding contact, carbon brushes are widely used in many electrical equipment. The product materials mainly include electrochemical graphite, grease-impregnated graphite and metal graphite (containing copper and silver).
Slip rings are electrical components responsible for connecting and transmitting energy and signals to rotating bodies. According to the transmission medium, slip rings are divided into electrical slip rings, fluid slip rings and smooth slip rings, which can also be collectively called "rotary connections" or "rotary connections".
The slip ring is usually installed in the rotation center of the equipment and is mainly composed of two parts: rotating and fixed. The parrotating part is connected to the rotating structure of the device and rotates with it, called "rotor", and the fixed part is connected to the energy source of the fixed structure of the device, called "stator".
Detailed information:
2. From the use point of view, the main signs of good brush performance are:
(1) Long service life and no wear of the commutator or ring current collector.
(2) It has good switching and current collection performance, suppressing sparking within the allowable range and reducing power loss.energy.
(3) When the brush is running, it does not overheat, makes little noise and is not damaged.
(4) During operation, a uniform, moderate and stable oxide film can quickly form on the surface of the collector or collector ring.
3. Test brushes using instruments. From a technical point of view, electric brushes must comply with national ministerial standards. The instrument can be used to detect the performance of the brush according to the “Brush Technical Performance Table”. Such as brush resistivity, Rockwell hardness, volume density, current density, contact voltage drop, coefficient of friction, 50 hours of wear, permitted peripheral speed, unit pressure and even content metal, etc.
Baidu Encyclopedia - Carbon Brushes
1. The contact resistance increases and the excitation current decreases
2 TheCarbon brushes and slip rings overheat. , it will catch fire in severe cases
3. Sparking occurs between the carbon brush and the slip ring, causing electrical corrosion and increased wear of the slip ring
Process:
1. Adjust the spring pressure of the slip ring carbon brush to ensure good contact between the carbon brush and the slip ring
2. Before replacing the carbon brush, polish the contact surface of the carbon brush to create the arc of the carbon brush matches the arc of the slip ring
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3. Blow the slip ring with low pressure air each time you change it to prevent toner buildup
4. the slip ring is badly worn, the slip ring needs to be polished and replaced with a softer carbon brush