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Steps and methods for disassembling and assembling the motor

by:JNSN     2022-03-14
① 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 connector wires, end caps and shells, bearing caps and end caps, etc., so as to avoid mistakes during assembly. The general steps for removing 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 cover; (8) Remove the fan; (9) Remove the rear bearing (10) Remove the rear 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 assembly steps of the motor are opposite to the disassembly steps. For general medium and small motors, only the fan blade cover, fan blade, front bearing outer cover and front end cover are removed, and the rear bearing outer cover and rear end cover are pulled out together with the front and rear bearings, the bearing inner cover and the rotor. ②Disassembly method of main parts (1) Disassembly and assembly of pulley or coupling. When disassembling, first mark the position between the pulley or the coupling and the rotating shaft, unscrew the fixing screw and pin, and then slowly pull it out with a puller. If you can't pull it, you can pour some kerosene in the inner hole and pull it again. If it still can't be pulled out, use an emergency fire to quickly heat the pulley or coupling, wrap the shaft with a damp cloth, and pour cold water continuously to prevent heat from entering 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 put it on the shaft, use wrought iron or hardwood to pad one end of the key, gently. Knock the key into the slot. The key should be moderately tight in the groove. Too tight or too loose will damage the key and the groove, and if it is too loose, the belt will slip or vibrate. (2) Disassembly and assembly of bearing cap. The removal of the bearing cover is very simple, as long as you unscrew the screws that fix the bearing cover, you can remove the front and rear bearing covers. The front and rear bearing covers should be marked with marks respectively to avoid wrong installation. The assembly method of the bearing outer cover is: put the outer cover through the rotating shaft sleeve outside the end cover, insert a screw, hold the screw with one hand, and turn the rotating shaft with the other hand, so that the bearing inner cover also turns 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 remaining two screws are installed and tightened. (3) Disassembly and assembly of the end cover. Before dismantling, mark the seam between the end cover and the base to facilitate restoration. Then unscrew the screws that fix the end caps, and slowly pry off the end caps with a screwdriver (the screw and the end caps should be done evenly and symmetrically diagonally). The front and rear end caps should be marked to avoid mistakes during assembly. When assembling, align the seam marks on the casing and the end cap, and install the end cap. Insert the screw and tighten it (the screw should be screwed in symmetrically according to the pair of lines, and it should be tightened several times, and it should not be loose or tight, so as not to damage the end cover). At the same time, turn the rotor at any time to check whether the rotation is flexible. (4) Disassembly and assembly of the rotor. After removing the front and rear covers, the rotor can be pulled out. Since the rotor is heavy, care should be taken not to damage the stator coils. For small motor rotors, hold the rotor with one hand when pulling it out, pull the rotor out a little, then hold the rotor with the other hand and move it out slowly. For large motors, when pulling out the rotor, two people should lift one end of the rotor and move it out slowly. When assembling, the reverse process should be carried out, and it should be carefully fed into the center of the stator cavity. (5) Disassembly and assembly of rolling bearings. The method of disassembling the rolling bearing is similar to disassembling the pulley, and it can also be carried out with a pulley. If there is no puller, two iron poles can be used to clamp the shaft. Make the rotor suspended, and then place a wooden block or a copper block on the upper end of the rotating shaft, tap with a hammer to disengage the bearing, and pay attention to safety during operation. When assembling, you can find a flat iron pipe with an inner diameter slightly larger than the outer diameter of the rotating shaft and put it into the rotating shaft, so that the pipe wall is just on the inner ring of the bearing, and then the wood block at the nozzle can be hit with a hand hammer. Insert the bearing into the rotor position. Be careful not to be too tight between the inner circle of the bearing and the shaft. If it is too tight, you can use a fine emery cloth to swirl around the surface of the rotating shaft and polish it evenly, so that the bearing can maintain the general tightness after being inserted. In addition, the outer ring of the bearing and the end cover should not be too tight. When assembling the motor, special attention should be paid. If the end cover and bearing cover are not installed in the correct position, or the tightness and uniformity of the screws are not well controlled, the rotor of the motor will be eccentric, resulting in poor operation such as sweeping.
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