High-speed centrifuge high-speed motor maintenance
High speed centrifuge and drive section of ultra high speed centrifuge. They are all high-speed motors. For high-build motors, they can be repaired by the general method of repairing ordinary motors. They may not be repaired. After repairing, they may not be used for a long time. According to domestic and foreign practical experience. Introduce a different maintenance method for a high speed motor with a speed of 2O000RPM and a general low speed motor.
1. Determine if the armature needs to be disassembled
Observe whether there is a spark between the carbon brush and the commutator when the motor is running, the degree of sparking, (I) is no spark. It shows that both the carbon brush and the commutator are normal and need no repair; (2) there are only 2 to 4 very small sparks. At this time, carefully observe if the commutator surface is flat. In most cases, it is not necessary to repair; (3) In addition to r with 4 very small sparks of F, and 1 to 3 large sparks, it is not necessary to disassemble the armature, just use a sandpaper to grind the carbon brush commutator; (4 If there are 4 large sparks, you need to use a sandpaper to grind the commutator, or even carefully add the commutator to the car. This must remove the carbon brush and the armature. Of course, after a giant commutator is processed, it is necessary to change the carbon brush to brush the carbon brush.
2. Method of disassembling high speed motor
Because when removing the end cap and armature. Vibration will damage the carbon brush. The carbon brush should first be removed from the carbon brush. It is also fixed that the angle between the two carbon and the slanting device is not necessarily the same. To ensure that the original brush can be restored when installed, the left and right carbon brushes will not be reversed, and must be removed before the carbon brush is removed. Mark the left and right carbon brushes. Also remember not to damage the contact surface between the carbon and the commutator.
At one end of the high-speed motor, there is usually a heat-dissipating wind. At the other end, there may be a magnet or a speed-measuring ring for measuring the speed. When disassembling the fan blade and the magnet or the speed-measuring ring, be careful not to drop the fan. The speed measuring magnet is broken. Secondly, it should be proud of the fan bushing or between the magnetic steel bushing and the shaft, so that it can be installed according to the original marked position after the repair is completed. Because the dynamic balance test of the high-speed motor is carried with a fan blade or a speed measuring ring (speed measuring magnetic) Steel), so assembly must be assembled according to the symbol when disassembling. This is a trivial matter in general motor repair. I can deal with the overall situation in the repair of high-speed motors. Because once the speed ring or fan blade is damaged. Or segments are assembled by mark, even if the other parts are well repaired. After assembly, it may cause unbalanced vibration of the whole machine during high-speed operation.
When disassembling a high-speed motor, you can't use a hammer or a punch. If you want to use a hard pull, you should use a puller. When using a puller, pay attention: the top of the pull should be placed directly on the top eye. A protective pad is to be placed on the top of the puller and the top eye to protect the top eye on the armature shaft from damage.
Fix the end caps on both ends of the eMule. Before disassembling, mark the seven lower end caps. In order to repair, install J: as it is. The bearing on the armature of the r arm should be carefully cleaned. Clean the gasoline in the house when cleaning. After the gasoline is dry, fill the bearing chamber with 7014 (or 7018) bearing grease. (The bearings of the high-speed motor cannot be used with ordinary butter or disulfide. molybdenum). Put it in a clean place for use; if the surface of the commutator is flat and has a purple sheen, this is the oxide layer that protects the surface of the commutator, and removes the powder from the surface with a soft brush.
