When the current of three-phase asynchronous motor is high, it often shows that the motor has a serious fever. Dalan Motor Xiaobian concludes that the following 7 points basically summarize the reasons for the high motor current, and we learn together.
1, power problems
There are several reasons why the power supply overheats the motor:
(1) The power supply voltage is too high
(2) The power supply voltage is too low
(3) Asymmetric power supply voltage
(4) Three-phase power imbalance
2, the load problem
There are several reasons why the motor is overheated in terms of load:
(1) Motor overload operation
(2) The mechanical load dragged is not working properly
(3) The fault of the dragging machine
3, the motor itself
(1) Breaking of motor windings
(2) Motor winding short circuit
(3) motor star connection error
(4) motor coil connection error
4, ventilation and heat problems
(1) The ambient temperature is too high and the inlet air temperature is high.
(2) The air inlet is blocked by debris, which makes the air intake difficult, resulting in small air intake.
(3) Excessive dust inside the motor affects heat dissipation.
(4) The fan is damaged or reversed, resulting in no wind or small wind volume.
(5) The wind shield is not installed in the wind shield or the motor end cover, causing the motor to have no certain wind path.
5, repair motor problems
The motor start-up current of the reworked motor reaches more than 66%. At the same time, frequent motor operation will also cause high current and overheat the motor.
6, series resistance problem
Wound-type motors do not match with series resistors. At the same time, frequent operation of the motor can also result in high current and overheating of the motor.
7, motor vibration problem
(1) Excessive motor vibration may also result in high motor current. Reasons and solutions:
(2) Rotor imbalance - leveling balance
(3) Unbalanced pulley or bending of shaft - check and correct
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