Detailed Introduction

Reasons for motor overheating:

One reason is related to the power supply: if the voltage is too high or too low, under specific loads, if the voltage fluctuation range should be outside+10% to -5% of the rated value, it will cause the motor to overheat; Asymmetric three-phase voltage of the power supply, with a phase to phase imbalance of more than 5%, can cause winding overheating; Due to phase loss operation, experience has shown that over 85% of agricultural motors being burned out are caused by phase loss operation. Therefore, it is necessary to install phase loss protection devices for the motors.

The second reason is related to the water pump: the selection of power is not matched, the small horse pulls the big car, and the electric motor runs under overload for a long time, causing the temperature of the electric motor to be too high; Motors that start too frequently and have a short-term or intermittent working system are continuously operated. The number of starts should be limited, thermal protection should be selected correctly, and it should be used according to the rated value on the motor.

The third reason is the motor body: incorrect connection, mistakenly connecting the △ shape to the Y shape, causing the temperature of the motor to rise rapidly; The stator winding may have phase to phase short circuits, turn to turn short circuits, or local grounding. In mild cases, the motor may overheat locally, and in severe cases, the insulation may be burned out; The squirrel cage rotor has broken bars or defects, and the temperature of the iron core rises rapidly when the motor runs for 1 to 2 hours; If the ventilation system malfunctions, check whether the fan is damaged, whether the rotation direction is correct, and whether the ventilation duct is blocked; Bearing wear and rotor eccentricity can cause metal collision sounds between the stator and rotor cores, leading to a rapid increase in core temperature. In severe cases, the motor may smoke or even burn out the coils.

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