Reasons of overheating of power motor for agricultural deep well pump

Reasons of overheating of power motor for agricultural deep well pump
There are four reasons. First, the power source of the reasons: the voltage is too high or low, under a specific load, if the voltage range should be in the range of +10% to -5% of the rated value will cause the motor overheating; power three-phase voltage asymmetry, Phase-to-phase voltage interphase imbalance of more than 5%, will lead winding overheating; phase operation, experience shows that more than 85% of agricultural motor is burned due to lack of phase operation caused by motor phase protection device should be installed. Second, the reasons for deep-well pump: selection of power is not complete, small horse-drawn carts, motor overload operation for a long time, so that the motor temperature is too high; start too frequently, fixed or short-term intermittent work of the motor system for continuous work. Should limit the number of starts, the correct choice of thermal protection, according to the calibration of the motor using the quota. The stator windings are short-circuit, inter-turn short-circuit or local grounding, light when the local overheating of the motor, in severe cases when the insulation is not connected to the motor, Burnout; squirrel cage rotor broken or defective, the motor running 1 to 2 hours, the core temperature increased rapidly; ventilation system failure, should check whether the fan is damaged, the direction of rotation is correct, whether the ventilation duct blockage; Eccentric cleaning chamber so that the stator and rotor core phase wiping metal impact sound, the rapid increase in core temperature, a serious electric motor smoke, and even coil burned. Fourth, the working environment reasons: the motor winding damp or dust, oil, etc. attached to the winding, resulting in lower insulation. The insulation resistance of the motor should be measured and cleaned, dried; the ambient temperature is too high. When the ambient temperature exceeds 35 ℃, the inlet air temperature is high, the motor temperature is too high, should try to improve their working environment. Such as scaffolding shade.
Reminded: due to electrical causes of failure, should be requested to obtain professional qualification certificate of electrical maintenance, knowledgeable people can not blindly repair, to prevent the occurrence of personal injury accidents.