Explain the reasons for the burning of the motor winding
It could be due to any of the following reasons:
1.Overloading
2.Jam Bearing
3.Low voltage
4.Single or two phase running
5.Foreign object
6.Weak insulation
7.Wearing and tearing
8.Over voltage.
9.Protection failure.
10.Mechanical failure.
If a phase fails, the two-phase tries to carry the load hence the current increases then there will be probably a burnt motor winding within an interval. This is the most dominant cause of motor winding burning. If it is not detected in time, most certainly the motor will burn. Also, a bad CB or blown fuse can cause a phase failure.
Bad bearing: when bearing is bad you hear a sharp noise that happens during load or on no-load. They can last for days and months before they cause burn to the motor winding.