First, start the equipment technology state should remain intact Motor starter equipment state of technology is directly related to the ability to start smoothly, practice shows that the vast majority of burned motors are not started and burned. If the start-up equipment has a poor state of technology, the lack of phase starts; the contacts of the contactor pull the arc, causing the voltage and current to change dramatically. The best way to keep the equipment in a good technical condition is to do inspections, cleaning and fastening work. If the contacts of the contactor are not clean and the oxidative ablation is serious, the contact resistance will increase, causing heat and ablation of the contacts, thus forming a phase-missing operation and burning the motor windings; the contactor suction coil core has rust and dust , It will make a strong noise absorption and increase the coil current until the coil is burned. Therefore, the electrical control cabinet should be set in a dry, ventilated and easy to operate position; also regular dust removal, cleaning contacts; coil core to increase rust prevention measures; often tighten the connection parts; check contactor contacts, ensure Good contact, institutional actions should be flexible and accurate, these are the inevitable conditions to ensure smooth start-up. Second, keep the motor clean and a good cooling environment In the motor inlet, must always be kept clean. There must be no dust, oil, water stains or other debris in the surrounding of the air inlet to prevent such things from inhaling into the motor to form a short circuit medium or damage the motor winding insulation layer; or to block the ventilation cooling of the motor and increase the temperature, resulting in burn. Third, to maintain the motor under rated current work agricultural motor overload operation, the main reason is that the drag load is too large; voltage is too low; or dragged by the mechanical locking caused. When the motor is in an overload state, the motor speed drops, the current increases, the temperature rises, and the winding coils overheat. If the overload time is slightly longer, the overload motor absorbs a large amount of active power from the power grid, and the current increases rapidly, and the temperature rises accordingly. Motor insulation materials that operate at high temperatures tend to age and fail to burn the winding coils. This is the main reason for burning a motor.
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