How to avoid such as motor burned

How to avoid such as motor burned 2019 - 01 - 25 to 1. Keep the motor clean. Motor in operation, at least 3 meters around inlets, there is no dust, tar and other sundry, to prevent internal suction motor, form a short circuit medium, or damage to the wire insulation layer, causing short circuit between box, current, temperature and burning motor. 2. Keep the motor in the rated electric work flow. Motor overload operation, the main reason is due to the large drag load, the voltage is too low, or is driven mechanical binding, etc. If overload time is too long, the motor will absorb a large number of active power from the power grid, the current increases sharply. Temperature rise, too. In the high temperature aging failure and burned by the insulation of the motor. 3. Regularly check whether motor three phase current balance. Any one phase current three-phase asynchronous motor, three phase current and the other two don't allow more than 10%, the difference between the phase current average in order to ensure the safe operation of the motor. If more than suggests that the motor has a fault, you must find out the reason out in a timely manner. 4. Check the temperature of the motor. To check the bearing of the motor, stator, shell temperature in areas such as the presence of abnormal changes, especially for voltage, current and frequency monitoring and no motor overload protection, surveillance of temperature is more important. Motor bearing is overheating, lack of oil, if found near the bearing temperature rise too high, it is necessary to stop the machine immediately to check. Bearing of the rolling element and raceway surface crack, scratch or damage, whether the bearing due to the large clearance, the inner ring on the shaft with and without rotation, etc. , in any of these phenomenon, must update the rear bearing can work all right. 5. Observed with and without vibration and noise of the motor and abnormal smell. Motor in operation, especially in high power motor more often should check the foundation bolt, the motor end cover, bearing gland is loose, such as whether the grounding device, reliable and timely solve the problems found. Noise and odor is abnormal motor, then appeared serious fault of precursors, must be timely find out the reason and ruled out. 6. Guarantee the normal work of the boot device. Practice has proved that the vast majority of the motor burnt, mostly is caused by abnormal boot device work, such as the boot device appear lacks, contactor contact arc, flint, etc. And maintenance of boot device is clean and tighten. Such as contactor contact not clean will make contact resistance increases, cause fever burned contact, due to lack of phase and the burning motor; Contactor coil of core rust and dust absorption product, can make the coil and lax, and a strong noise and increase the coil current, burning coil the cause of failure. Therefore, electric control cabinet should be located in dry, ventilated and location for easy operation, and dust collection on a regular basis. Always examine contactor contact, iron core coil, all wiring screws and so on are reliable, the mechanical parts movement is flexible, to keep the good state of technology.