The surface dust of Carbon Brush can affect generator
The dust on the surface of the Carbon Brush will affect the generator, if the door is closed, the dust from the outside is attached to the brush and the brush is attached to the brush, which affects the brush heat. On the other hand, when the Carbon Brush has a spark, the surface of the brush is not clean, and the insulation strength between the brush is not easy to ring fire. In addition, the slide ring has a spiral groove, which is to increase the area of the brush, improve the contact with the Carbon Brush, make the brush more fully cool, and make the carbon powder smoke more easily. If the cabinet door is not tight, the fan is not enough outside the dust also easily attached to the spiral ditch, the result is predictable, we should arouse enough attention.
The maintenance of the Carbon Brush holder should be checked frequently.
1. The Carbon Brush rack is fragile. Remove the dust from the Carbon Brush to keep the Carbon Brush in good working condition and replace the new Carbon Brush.
2. Replace the Carbon Brush. When the Carbon Brush wears out too much.
In practice, the knowledge of the Carbon Brush rack should not be less than 75% of the contact area of the commutator or collector ring. It is important to note that the Carbon Brush arc of the factory is only coarse grinding, and the grinding arc is usually carried out on the motor.
The structure of the Carbon Brush frame is characterized by a conductive ring that avoids the central opening of the Carbon Brush frame and can avoid the bottom metal plate of the Carbon Brush frame. The two ends of the conductive ring are in a conductive form with the conductive elements on the upper non-metal plates of the Carbon Brush, which are connected to one end and connected to a wire. The the other side of the wire is connected with a fixed screw conduction, the fixed screw with than with a shell of a conductive insulation interval way and is fixed on the motor housing a proper place, and makes the fixed screw screw prominent set in the shell.
Ensure that the Carbon Brush holder works on the surface of the commutator or collector ring, and shall not be close to the edge of the collector ring. If the Carbon Brush frame is not installed in the cold state, the Carbon Brush frame may not contact the ring surface after the big shaft expansion in the hot state. There should be a proper clearance between the Carbon Brush holder and the Carbon Brush frame, and the lower end of the Carbon Brush frame shall be within two to four millimeters of the spacing of the commutator or collector ring. The spacing is too small, the Carbon Brush frame is easy to wipe the commutator or collector ring; Too large, the Carbon Brush rack is easy to move and cause damage. The arc of the Carbon Brush is used to match the commutator or collector ring.
The Carbon Brush frame is different in shape, and it is used on the motor to be rectangular and installed on the Carbon Brush rack. There is a certain pressure between the Carbon Brush frame and the commutator or the slip ring, the large Carbon Brush frame structure is more complex, the small Carbon Brush frame is simpler.
The distance between the bottom edge of the Carbon Brush frame and the surface of the collector ring should be kept within 2 ~ 4 mm. The distance is too small, the brush frame is easy to erase commutator or collector ring; Too large a Carbon Brush can cause damage. Ensure that the Carbon Brush works on the surface of the commutator or collector ring, and shall not be near the edge of the collector ring. If the Carbon Brush is not installed in the cold state, the Carbon Brush may not contact the surface of the ring after the large shaft expansion of the motor in the hot state. The Carbon Brush frame can be used for dc motors or ac commutator motors, such as general electric tools, such as hand drills and Angle mills. He USES the commutator to realize the motor current commutation.