Two cases where the three-phase motor current is too high
2-load problem
There are several reasons for the motor to overheat in terms of load:
1, motor overload operation
When the equipment is not matched and the load power of the motor is greater than the rated power of the motor, the long-term overload operation of the motor (ie, the small horse-drawn cart) will cause the motor to overheat. When repairing the overheated motor, first check whether the load power matches the motor power to prevent blind and unintentional disassembly.
2. The mechanical load of the drag is not working properly.
Although the equipment is matched, the mechanical load that is dragged is not working properly. When the load is large, the load is large and the motor is overloaded and generates heat.
3, the dragging machinery is faulty
When the machine being dragged is faulty, the rotation is inflexible or stuck, it will overload the motor and cause the motor winding to overheat. Therefore, when the motor is overheated, the load factor cannot be ignored.
3- motor itself problem
1, motor winding open circuit
When one phase winding in the motor winding is open, or one branch in the parallel branch is open, the three-phase current will be unbalanced and the motor will overheat.
2, motor winding short circuit
When the motor winding has a short-circuit fault, the short-circuit current is much larger than the normal operating current, which causes the winding copper loss to increase, causing the winding to overheat or even burn out.
3, motor star angle connection error
When the delta connection motor is connected in a star shape, the motor is still running at full load, the current flowing through the stator winding exceeds the rated current, and even the motor stops by itself. If the stall time is longer and the power is not cut off, the winding is not only serious. Overheating will also burn out. When the star-connected motor is misaligned into a triangle, or a plurality of coils are wired into a branch, the motor is misconnected into two branches in parallel, which will overheat the winding and the core, and will burn the winding in severe cases.
4, motor coil connection error
When a coil, a coil group or a phase winding is reversed, it will cause a serious imbalance of the three-phase current and overheat the winding.
5, the mechanical failure of the motor
When the motor shaft is bent, the assembly is not good, and the bearing is faulty, the motor current is increased, the copper loss and the mechanical friction loss are increased, and the motor is overheated.
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