After buy high speed dc motor, the maintenance and maintenance start from five aspects:
As long as we persist in watching, listening, touching, measuring and doing, the vast majority of failures can be prevented and avoided, and spare parts and repair costs can be reduced. The following is an introduction to the daily inspection and maintenance of the motor:
1, look: daily inspection, not only the motor inspectors, on duty and the tanker are also watching the motor work, the size and change of the current, to see whether there is a leak, dripping, will cause the motor insulation low. breakdown and burn. Is there anything outside the motor that affects its ventilation and cooling environment? To see whether the fan end cover, the fan leaf and the outside of the motor are too dirty to clean? Ensure cooling and cooling. Whoever finds a problem should be dealt with in a timely manner.
2, listen: Listen carefully to the motor's running sound is abnormal, the room noise is large, can use screwdriver or listening stick and other auxiliary tools, attach to both ends of the motor to listen, if often listen, not only can find the motor and its dragging equipment bad vibration, Even the amount of internal bearing oil can be judged, so that the corresponding measures such as adding bearing oil or replacing new bearings can be made in a timely manner, so as to avoid motor bearings lacking oil dry grinding and blocking, outside the circle, and the sweep chamber burning. It is difficult for large motors to disintegrate and replace bearings. When refueling with oil guns, attention must be paid to the use of special bearing oil(-35 °C ~ +140 °C), and the boring head screw on the other side is removed to squeeze out the old oil. Prevent the oil from being pushed into the interior of the motor due to pressure, splashing on the fixed rotor during operation, and affecting the heat dissipation function of the motor.
3. Touch: Use the temperature around the back of the mold motor, or check with a thermostat. In the case of better bearing condition, the temperature at both ends will be lower than that at the middle winding section. If the temperature at both ends of the bearing is high, the bearing should be examined in conjunction with the sound condition of the bearing measured. If the overall temperature of the motor is high, it must be processed in conjunction with the working current inspection of the load, equipment and ventilation of the motor. According to the insulation level of the insulating material used by the motor, the limit temperature of the motor's running winding insulation energy for long-term use can be determined, or the motor's allowed temperature rise(the actual temperature of the motor minus the ambient temperature). There are differences in the insulation standards of various countries, but they are basically divided into: Y, A, E, B, F, H, and C, of which the Y-level temperature increase is the lowest(45 °C). The C level allows the highest temperature rise(above 135 °C). In terms of bearing oil and other materials, the temperature measured by a thermometer attached to the motor is best controlled below 85 °C.
4, measurement: When the motor stops running, it is necessary to use the insulation meter to measure its relative resistance or interphase resistance, and when it is found to be bad, bake with a damp light to improve the insulation, so as not to be too low due to insulation(recommended value & GT; 1zhaoou) Break through the winding burn motor. Do not switch off the heat switch except in special circumstances. In wet weather and winter, special attention should be paid to the waterproof, moisture-proof and drying of electric motors. Special attention should be paid to the water density of electric machines in open air and wet places. For motors suspected of being seriously affected by moisture or splashing water, they should be carefully checked before use. Conditionally, the canvas cover should be sewn to protect it, which can relatively guarantee the insulation of the motor. However, during high temperature weather or for a long period of time, the canvas cover must be removed during continuous use to prevent the thermal dissipation from causing the motor to overheat and burn. If the motor is immersed in water, as long as the motor is disassembled, the rotor is drawn out, rewashed with hot fresh water at 60-70 °C, dried with compressed air, and baked with a light from both ends of the motor stator. The insulation of the motor is lifted to normal.
5, do: not only to check the problems found in the timely remedial measures, but also according to the maintenance cycle for the motor screw, wiring, dismantling inspection, cleaning and maintenance. Such as: air conditioning fan motor end cover 4 fixed screws all loose, sweep operation burn; Boiler fan motor fan leaves fall off to block and burn, because of the failure to check and tighten in time; The pump motor bearings are poor and the operating temperature is high. The failure to replace the bearings in time causes the motor to burn out, and the main oil pump of the motor, due to the decline in the wet insulation resistance of the weather, does not bake and improve the insulation in time, because the problem has been discovered. But didn't do any maintenance. Whether it is not watching or not, or just watching or not, it will eventually cause a failure or an accident.
