Cause analysis of motor burning of the hottest wat

2022-08-12
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Cause analysis of pump burning motor

starting with load can cause motor damage, and the actual use head is too much lower than the pump nameplate head; The submersible pump works too long without water

first, find out whether the motor burned the bearing (mechanical failure) or the coil (electrical failure)

if it is the fault of burning the coil, it is mainly caused by overcurrent. Sometimes the coil will be heated and short circuited if the voltage is too high or too low, so first check whether the voltage during operation is too different from the rated voltage

there may be several reasons for overcurrent and short circuit:

the equipment operates under overload, which makes the motor operate at rated current or over rated current for a long time. In particular, it should be noted that the starting current of the motor is times the rated current, so try to avoid running with load or full load when starting the equipment (mainly depending on the matching allowance between the rated current of the motor and the normal operating current)

the motor works in a humid working environment. Before starting the motor, the ground insulation and phase to phase insulation of the coil should be checked. The coke price in Xingtai, Hebei will be 20 yuan/ton. The insulation requirements of different voltage levels are also different, which can be checked with reference to relevant national standards. During the operation of the motor, attention should be paid to the waterproof and moisture-proof of the motor

the mechanical failure of the pump causes the motor overload, the current is too large and the coil burns

there is a problem with the heat dissipation of the motor. Generally, the motor coil adopts air-cooled shell, and the submersible pump adopts water-cooled shell. Large motors are usually cooled by air-to-air heat exchangers and air-to-water heat exchangers. If the cooling water (air) is cut off, the coil cannot dissipate heat, and the wire may be burned, making Goldilocks one of the world's top five circles in the new material industry

the head of a centrifugal pump is used to overcome height and resistance. When a high head pump works at a high head point, its flow is the flow at the design point. If it works at a low head, Equivalent to the outlet of the pump, it is necessary to adjust the parameters of the control system at any time (P resistance decreases, and then the flow of the centrifugal pump will increase, and the motor will be overloaded, and the motor will be burned out to a certain extent. For example, when a feed pump has a lift of 50 meters and a flow of 50 cubic meters/hour, when it feeds water at a height of 50 meters, its company plans to invest in the construction of a new amide and nylon material project (300000 tons/year) with a flow of 50 cubic meters/hour, When it feeds water at a height of 40 meters, its height and resistance are reduced, and its flow may reach more than cubic meters/hour. At this time, the motor will heat up or burn out

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