Problems with the motor itself
1. Open circuit of motor winding
When one of the windings of the motor is broken, or one of the parallel branches is broken, it will cause the three-phase current to be unbalanced and the motor will overheat.
2. Short circuit of motor winding
When the motor winding has a short-circuit fault, the short-circuit current is much larger than the normal working current, which increases the copper loss of the winding, and causes the winding to overheat and even burn.
3. Wrong connection of motor star angle
When the delta connection motor is wrongly connected in a star shape, the motor is still running with full load, and the current flowing through the stator winding will exceed the rated current, which may even cause the motor to stop by itself. If the stoppage time is a little longer and the power supply is not cut off, the winding is not only serious Overheating, it will burn. When a star-connected motor is wrongly connected to form a triangle, or a motor with several coil groups stringed into a branch is connected to two branches in parallel, the winding and the iron core will be overheated, and the winding will be burnt in severe cases.
4. Wrong connection of motor coil
When a coil, coil group or one-phase winding is connected reversely, it will cause serious imbalance of the three-phase current and overheat the winding.
5. Mechanical failure of the motor
When the motor shaft is bent, the assembly is not good, the bearing is defective, etc., the motor current will increase, copper loss and mechanical friction loss will increase, and the motor will overheat.
Ventilation and heat dissipation problems
1. The ambient temperature is too high, making the inlet air temperature high.
2. There is debris blocking the air inlet, which makes the air inlet not smooth, resulting in a small amount of air inlet.
3. Excessive dust inside the motor affects heat dissipation.
4. The fan is damaged or installed reversely, resulting in no wind or small air volume.
5. There is no wind shield or no wind baffle in the motor end cover, resulting in the motor without a certain air path. 5 The problem of repairing the motor The starting current of the repaired motor reaches more than 66%, and the frequent operation of the motor will also cause high current and cause the motor to overheat.
6 Series resistance problem The winding motor does not match the series resistor, etc. At the same time, the frequent operation of the motor will also cause high current and cause the motor to overheat.
7 Motor vibration problems. Excessive motor vibration may also cause high motor current. Reasons and solutions:
1. Rotor unbalance-leveling balance
2. Unbalanced pulley or bent shaft extension-check and correct
3. The axis of the motor and the load are not aligned-check and adjust the axis of the unit
4. The motor is not properly installed-check the installation and the foot screws
5. The load is suddenly too heavy-reduce the load
1. Open circuit of motor winding
When one of the windings of the motor is broken, or one of the parallel branches is broken, it will cause the three-phase current to be unbalanced and the motor will overheat.
2. Short circuit of motor winding
When the motor winding has a short-circuit fault, the short-circuit current is much larger than the normal working current, which increases the copper loss of the winding, and causes the winding to overheat and even burn.
3. Wrong connection of motor star angle
When the delta connection motor is wrongly connected in a star shape, the motor is still running with full load, and the current flowing through the stator winding will exceed the rated current, which may even cause the motor to stop by itself. If the stoppage time is a little longer and the power supply is not cut off, the winding is not only serious Overheating, it will burn. When a star-connected motor is wrongly connected to form a triangle, or a motor with several coil groups stringed into a branch is connected to two branches in parallel, the winding and the iron core will be overheated, and the winding will be burnt in severe cases.
4. Wrong connection of motor coil
When a coil, coil group or one-phase winding is connected reversely, it will cause serious imbalance of the three-phase current and overheat the winding.
5. Mechanical failure of the motor
When the motor shaft is bent, the assembly is not good, the bearing is defective, etc., the motor current will increase, copper loss and mechanical friction loss will increase, and the motor will overheat.
Ventilation and heat dissipation problems
1. The ambient temperature is too high, making the inlet air temperature high.
2. There is debris blocking the air inlet, which makes the air inlet not smooth, resulting in a small amount of air inlet.
3. Excessive dust inside the motor affects heat dissipation.
4. The fan is damaged or installed reversely, resulting in no wind or small air volume.
5. There is no wind shield or no wind baffle in the motor end cover, resulting in the motor without a certain air path. 5 The problem of repairing the motor The starting current of the repaired motor reaches more than 66%, and the frequent operation of the motor will also cause high current and cause the motor to overheat.
6 Series resistance problem The winding motor does not match the series resistor, etc. At the same time, the frequent operation of the motor will also cause high current and cause the motor to overheat.
7 Motor vibration problems. Excessive motor vibration may also cause high motor current. Reasons and solutions:
1. Rotor unbalance-leveling balance
2. Unbalanced pulley or bent shaft extension-check and correct
3. The axis of the motor and the load are not aligned-check and adjust the axis of the unit
4. The motor is not properly installed-check the installation and the foot screws
5. The load is suddenly too heavy-reduce the load
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