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Why Does The Motor Of Centrifugal Pump Appear To Be Burned?
TIME：2024-06-03 Author：admin Views：
Why does the motor of centrifugal pump appear to be burned ? Many conditions can cause burnouts, such as starting with load can cause motor damage, the actual used lift is too much lower than the pump nameplate lift, some chemical pumps work too long without water etc., First of all ,it is necessary to find out whether the centrifugal pump motor burns the bearing or the coil.
The failure of the burning coil mainly dut to overcurrent, sometimes too high or too low voltage can also cause coil heating shortcircuit, so first check the voltage during operation is not too much difference from the rated voltage.
Mechanical failure of the pumping machine causes the motor to be overloaded and the current to be too high and the coil burned.
The motor has a problem with heat dissipation. Generally motor coils are air-cooled enclosures and submersible pumps are water-cooled enclosures. Large motors are mostly cooled by air-to-air heat exchangers and air-to-water heat exchangers. If the cooling water (air) is broken, so that the coil can not dissipate heat, both may burn the coil.
The failure of the burning coil mainly dut to overcurrent, sometimes too high or too low voltage can also cause coil heating shortcircuit, so first check the voltage during operation is not too much difference from the rated voltage.
Motor short circuit, there may be several reasons:
Fluoroplastic centrifugal pump equipment is overloaded, so that the motor is running 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 3-5 times the rated current, so you should try to avoid starting the equipment with a load or full load operation (mainly depends on the rated current of the motor and the matching margin of the normal operating current).
The motor works in a humid working environment. In the motor before starting should check the coil insulation to ground and phase insulation, different use of voltage level insulation requirements are different, you can refer to the relevant standards check. In the operation of the motor should pay attention to the waterproof and moisture-proof motor.
Mechanical failure of the pumping machine causes the motor to be overloaded and the current to be too high and the coil burned.
The motor has a problem with heat dissipation. Generally motor coils are air-cooled enclosures and submersible pumps are water-cooled enclosures. Large motors are mostly cooled by air-to-air heat exchangers and air-to-water heat exchangers. If the cooling water (air) is broken, so that the coil can not dissipate heat, both may burn the coil.
The actual use of head is too much lower than the pump nameplate head. Centrifugal pump head is used to overcome the height and resistance, high head of the pump in the high head point of work when his flow is the design point of the flow, if the work in the low head, the equivalent of the pump's export resistance decreases, then the flow of centrifugal pumps will increase, the motor will be overloaded, over to a certain extent will burn the motor.
Chemical pump motor to be burned can be summarized as follows: load, power supply, motor insulation, phase failure, etc.
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The characteristics of overload is that
the windings are all black and the end ties are discolored and become brittle or even break. The characteristics of phase failure is that one or two phases (4 stages) of the winding are all blackened, the coil is damaged symmetrically, and there are rules for missing phases.
