An electric motor runs hot under load owing to internal irre

An electric motor runs \"hot\" under load, owing to internal irreversibilities.It has been suggested that the associated energy loss be minimized by thermally insulating the motor casing. Comment critically on this suggestion.

Solution

The electric motor which is used to conver electrical energy into mechanical energy. When the electric motor in rest position (no load condition) only the ambient air temperature is acting on the motor that\'s why motor temperature is in cool condition.if applying of any load on motor there is temperature change internally, if the load is applied continuosly the winding temperature is raises over than ambient temperature that\'s why motor running hot in load condition.This is mainly depending on the design & cooling arrangements.Motors must use following insulations for good working.....

- Enamel coating on the magnet wire.

- Insulation that comes to the conduit box.

- Sleeving where leads connect to magnet wire.

- Lacing string that binds the end turns of the motor.