The main point of the motor routine maintenance inspection is to discover the abnormal state of the equipment as soon as possible and handle it in time to prevent the accident from expanding. Maintenance personnel according to the relay protection device action and signal can be found anomalies, you can also rely on the experience of maintenance personnel to determine the incident signs. 1, the first is the visual inspection Visual inspection of the following anomalies: whether the motor external fasteners are loose, whether the parts are damaged, the surface of the device is oil, corrosion; the motor contact points and connections are discolored, Burn marks and smoke and other phenomena. The reasons for these phenomena are due to motor overheating, poor conductor contact or winding burn, etc .; instrumentation is normal. Voltmeter without instructions or not, it indicates that the supply voltage is not balanced, the fuse blown, three-phase rotor resistance imbalance, single-phase operation, poor conductor contact. If the ammeter indicates too large, it indicates that the motor is overloaded, the bearing is faulty, and the winding turns are short-circuited. The reason why the motor stalls is as follows: power failure, single phase operation, low voltage, too small motor torque, excessive load, Drop too large, bearing burned, mechanical stuck. 2, the use of auscultation stick by hearing can hear a variety of motor noise, including electromagnetic noise, ventilation noise, mechanical noise, bearing noise, etc., which can determine the cause of the motor failure. Cause of noise in the machinery are: bearing failure, mechanical imbalance, loose screws, coupling does not meet the requirements of the rotor core friction with the stator, etc .; in the electrical: voltage imbalance, single-phase operation, winding Breaking or breakdown breakdown, poor starting performance, acceleration performance is not good. 3, by smell can find burning smell, odor caused by this phenomenon are: motor overheating, winding burned, single-phase operation, winding failure, bearing failure and so on. 4, by touch touch the surface of the case can be found motor temperature and vibration caused by vibration phenomenon is: mechanical load imbalance, the fastening parts have loose phenomenon, the motor base strength is not enough, the coupling is not properly connected, Air gap uneven or mixed with debris, voltage imbalance, single-phase operation, winding failure, bearing failure and so on. Cause the motor temperature is too high due to overloading, blocking the cooling air duct, single-phase operation, turn to turn short circuit, the voltage is too high or too low, three-phase voltage imbalance, poor acceleration characteristics to start too long, the stator and rotor phase Rub, starter poor contact, frequent start and brake or reverse brake, the inlet air temperature is too high, mechanical stuck. 1, minor repair project (1) motor hair cleaning, do the general inspection. (2) Clean the bearings for inspection and oil change. (3) deal with local insulation winding failure, winding reinforcement and bandaging lead insulation and other work. (4) Fasten all the screws. (5) Adjust the fan, fan cover, and reinforcement. 2, the repair project (1) contains all minor repair project content. (2) Clean and dry the motor, replace the local coil and repair to strengthen the winding insulation. (3) Motor disassembly inspection, handling loose coils and wedges, and fastening parts of each section. (4) Rotor to do dynamic balance test. 3, overhaul project (1) contains all the contents of the repair project. (2) Winding all rewinding update.
