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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.
One field is created by the rotor and one by the stator. The difference between motor types is in how these fields are created and controlled: EC motors use permanent magnets to create the rotor field, and a series of coils controlled by an electronic controller (or commutator) to create the stator field.