Tel：0512-65685025
Fax：0512-65650370
Email：sales@hanke-nmc.com
Website：http://www.hanke-nmc.com
Add: Block 7, No.19, Xingnan Road, Wuzhong, Suzhou City, Jiangsu, China
Name：Rebecca Dong
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Technical |
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The five department of daily maintenance |
The motor is composed of stator frame, winding and insulating material, rotor, two ends and end cover, etc. The reason of motor fault is: power failure phase, voltage or frequency is wrong; Winding short circuit, circuit breaker, grounding; (2) adverse transfer; Internal and external dirty, poor heat dissipation (the external paint is too thick is also the cause of poor heat dissipation), and the built-in cooling fan is bad, the ventilation is not smooth; Poor mechanical equipment; Long-term high load operation; High ambient temperature and so on. The damage of the motor, more than 90% are maintenance personnel daily check is not fine, inadequate, so motor repair experts suggest, "see, hear, touch, test, do" five steps to find initial cause of most failures can be prevent and avoid, decrease the loss of company spare parts and repair costs. At the same time, the maintenance engineer also stressed that the motor should not be opened without any measures, and should be timely contacted by the motor manufacturer after sale or professional motor repair shop. The first step, see: every day inspect the size and change of the electric current of the motor, see whether there is water leakage, drop, can cause the electric motor insulation low breakdown and burn out. Do you want to see if there are any objects that affect their ventilation and cooling environment? Do you need to clean the outside of fan end cover, fan blade and motor? To ensure its cooling and cooling effect. Whoever finds the problem should deal with it in time. The second step, listening: listen carefully motor running voice is unusual, because of engine room noise is larger, can use a screwdriver or auxiliary tools such as listening to good, close to listen to on both ends of the motor, if often listen to, can not only find bad vibration motor and drag equipment, even internal Zhou bear how much oil can judge, so as to timely add Zhou bearing oil, or replace new Zhou corresponding measures such as processing, avoid motor Zhou bearing oil shortage dry grinding and blocked, cylindrical, bore burn out. Most manufacturer considering the collapse of the replacement Zhou bear difficulties, will the open Zhou cap, on a regular basis (2000 h) must be noticed when oil gun refueling brand label Zhou socket used motor oil (- 35 ℃ ~ + 140 ℃), and put the bottom oil mouth open or on the other side of the screw apart, so that the old oil squeezed out in (note added oil quota) to prevent gas because of the pressure inside the oil into the motor, splash when working on the stator, affect the heat dissipation of the motor function and so on. Step 3: touch the temperature around the motor with the back of the hand. In the case of good condition, the temperature of both ends is lower than that of the intermediate winding. If the temperature of the two ends is high, the test will be checked in combination with the measured noise. If the overall temperature of the motor is high, the load, equipment and ventilation of the motor should be checked in combination with the working current. According to the motor insulation class of the insulating material used, glaze can determine motor run time limit temperature of the winding insulation can use for a long time, or motor allows the temperature rise of the actual temperature of the electric motor (minus the ambient temperature). The insulation class standard, but the basic is divided into: Y, A, E, B, F, H and C this several notches, which Y level allows the lowest temperature (45 ℃) and class C.
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