This article will briefly introduce the causes of submersible pump motor failure and inspection and maintenance technology.
Analysis of the causes of the burnout of the submersible pump motor
Starting with load can cause damage to the motor; The actual use head is too much lower than the pump nameplate head; The submersible pump works too long without water.
The head of the centrifugal pump is used to overcome the height and resistance, the flow rate of the pump with high lift is the flow rate of the design point when working at the high lift point, if it works at the low head.
it is equivalent to the decrease of the outlet resistance of the pump, then the flow rate of the centrifugal pump will increase, the motor will be overloaded, and the motor will be burned to a certain extent. For example, the head of a feed pump is 50 meters, the flow rate is 50 cubic meters / hour.

when it feeds water to a height of 50 meters, its flow rate is 50 cubic meters / hour, when it feeds water to a height of 40 meters.
its height and resistance reduce its flow rate may reach more than 80-90 cubic meters / hour, then the motor will heat up or burn out.
In addition, if it is a fault of the burned coil, it is mainly caused by overcurrent, and sometimes the voltage is too high or too low will also cause the coil to heat up and short circuit, so first check whether the voltage during operation is too different from the rated voltage.
There are several reasons for overcurrent short circuit:
1) The equipment is overloaded, so that the motor runs at the rated current or over the rated current for a long time.
In particular, it should be noted that the starting current of the motor is 3-5 times of the rated current, so it should be avoided to run under load or full load when starting the equipment (mainly depending on the matching margin between the rated current of the motor and the normal operating current).
2) The motor works in a humid working environment.

Before the motor starts, the ground insulation and interphase insulation of the coil should be checked, and the insulation requirements for different voltage levels are also different, which can be checked with reference to the relevant national standards.
During the operation of the motor, attention should be paid to the waterproof and moisture-proof of the motor.
3) The mechanical failure of the pump machine causes the motor to be overloaded, and the current is too large and the coil is burned.

4) The heat dissipation of the motor is problematic. Generally, the motor coil adopts an air-cooled shell, and the submersible pump is a water-cooled shell.
Large motors are mostly cooled by air-to-air heat exchangers and air-water heat exchangers.
If the cooling water (air) is cut off, the coil cannot dissipate heat, and the coil may be burned.
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At Dongchun Motor, we pride ourselves on being a leading manufacturer of top-quality electric motors, catering to various industrial needs across the globe. Our product range includes single phase motors, three phase motors, brake motors, VFD motors, and fan motors. Each product is meticulously engineered to meet the highest standards of performance and reliability.
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