Overheating of DC motors is mainly due to:

There are typically five main reasons for overheating are given below

1. Overload
2. Poor power condition
3. High effective service factor
4. Frequent stops and starts
5. Environmental reasons

• Over Heating in motors can cause a number of performance problems.
• Overheating causes the motor winding insulation to deteriorate quickly.
• For every ten centigrade rise in temperature, the insulation life is cut in half. It has been concluded that more than 55% of the insulating failures are caused by over-heating.
• Every electric motor has a design temperature. If a motor is started off at a bad current value, it starts operating in a much warmer condition than the design temperature.
• It is very important that the motors should be matched with their ideal current values.
• Overheating also occurs when an electric motor is forced to operate in a high temperature environment. This causes the rate at which heat can be conducted to reduce at an alarming rate.
• The area where electric motors are operating must have a proper cooling system and a ventilation system should be there in case the cooling system stops working.