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Steps and methods for disassembling and assembling the motor

by:JNSN     2021-12-27
①The steps and methods of disassembly and assembly of the motor. Before disassembly, the site should be cleaned up, tools should be prepared, and marks should be made on the joint line, end cover and shell, bearing cover and end cover, etc., so as to avoid mistakes during assembly. The general steps to remove the motor are as follows: (1) Remove the belt or disconnect the connecting pin of the oil coupling;    (2) Remove the power wiring and grounding wire in the junction box;    (3) Remove the pulley or coupling;   ( 4) Remove the foot nut and washer;   (5) remove the front bearing cover;   (6) remove the front end cover;   (7) remove the fan blade cover;   (8) remove the fan blade;   (9) remove the rear bearing Outer cover;   (10) remove the back end cover;   (11) pull out the rotor;   (12) remove the front and rear bearings and the inner cover of the front and rear bearings.  The steps of assembling the motor are opposite to the disassembling steps. For general medium and small motors, only the fan blade cover, fan blades, front bearing outer cover and front end cover are removed, and the rear bearing outer cover, rear end cover, front and rear bearings, bearing inner cover and rotor are taken out together. ②Disassembly and assembly method of main parts (1) Disassembly and assembly of belt pulley or coupling. When disassembling, mark the position between the pulley or coupling and the shaft first, unscrew the fixing screw and pin, and then slowly pull it out with a puller. If you can't pull it out, you can pour some kerosene into the inner hole and then pull it out. If you still can’t pull it out, you can quickly heat it around the pulley or coupling with a flash fire. At the same time, wrap the shaft with a damp cloth and continuously pour cold water to prevent heat from being transferred into the motor. When assembling, first use a fine iron emery cloth to smooth the shaft hole of the shaft, pulley or coupling, align the pulley or coupling with the keyway and set it on the shaft, use wrought iron or hardwood block to pad one end of the key, lightly Knock the key into the slot. The key should be properly tight in the groove. Too tight or too loose will damage the key and groove, and too loose will cause the belt to slip or vibrate.   (2) Disassembly and assembly of the bearing cap. The disassembly of the bearing cover is very simple, as long as the screws that fix the bearing cover are unscrewed, the front and rear bearing covers can be removed. The front and rear bearing covers should be marked with marks respectively to avoid wrong installation during assembly. The method of assembling the outer cover of the bearing is: insert the outer cover through the shaft and cover the end cover, insert a screw, hold the screw with one hand, and rotate the shaft with the other hand, so that the inner cover of the bearing will also turn to the screw of the outer cover. When the holes are aligned, the screws can be pushed into the screw holes of the inner cover and tightened, and finally the other two screws are also installed and tightened.   (3) Disassembly and assembly of the end cap. Before disassembly, mark the joint between the end cover and the base for restoration. Then unscrew the screws that fix the end cover, and slowly pry the end cover off with a screwdriver (screws and prying the end cover should be evenly and symmetrically diagonally). The front and rear covers should be marked to avoid mistakes before and after assembly. When assembling, align the joint marks of the casing and the end cover, and install the end cover. Insert the screws and tighten them (the screws should be screwed in symmetrically according to the pair of lines, and the screws should be tightened several times, and there should be no loose or tight, so as not to damage the end cover). At the same time, rotate the rotor at any time to check whether the rotation is flexible.   (4) Disassembly and assembly of the rotor. After the front and rear end covers are removed, the rotor can be withdrawn. Since the rotor is very heavy, care should be taken not to damage the stator coil. For the rotor of a small motor, hold the rotor with one hand when pulling it out, pull the rotor out a little, then use the other hand to support the rotor, and slowly move it out. For large motors, when pulling out the rotor, two people must lift one end of the rotor and move it out slowly. When assembling, proceed according to the above reverse process, and carefully feed in the center of the stator cavity.   (5) Disassembly and assembly of rolling bearings. The method of disassembling the rolling bearing is similar to that of disassembling the pulley, and it can also be carried out with a puller. If there is no puller, two iron poles can be used to clamp the shaft. Hang the rotor in the air, and then place a wooden block or a copper block on the upper end of the shaft, and hit with a hammer to disengage the bearing. Pay attention to safety during the operation. When assembling, you can find a flat iron pipe with an inner diameter slightly larger than the outer diameter of the shaft to fit the shaft so that the wall of the pipe is just against the inner ring of the bearing, and the wooden block at the mouth of the pipe can be hit with a hammer. Put the bearing into the rotor position. Note that the inner circle of the bearing and the shaft should not be too tight. If it is too tight, use a fine emery cloth to round the surface of the shaft and grind it evenly so that the bearing can maintain the general tightness after being sleeved. In addition, the outer ring of the bearing and the end cover should not be too tight. Pay special attention when assembling the motor. If the end cover and bearing cover are not installed in the correct position, or the tightness and uniformity of the screws are not grasped, the motor rotor will be eccentric, causing bad operation failures such as bore sweeping.
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