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The basic and main difference between motor and engine is that engine converts chemical energy of fuel into mechanical energy whereas motor converts electrical energy into mechanical energy. Both these devices used for develop mechanical motion. There are many other hidden differences which are described as follow.
Difference between AC generator and AC motor: 1  The AC generator is used to transform mechanical energy to electric energy while the motor is used to supply mechanical power to the load by the application of the electric current.  Both the AC generator and motors have fixed coil while the magnet is rotating.