Principle of Electric Motor Essay Example | Topics and Well Written Essays - 500 words

Principle of Electric Motor - Essay Example If the current carrying conductor is bent in a rectangular loop, then the two opposite sides that are at right angles to the magnetic field will experience force (Hyper Physics, n.d.). The direction of the force on both rectangular loop sides will be opposite to each other and therefore will produce a torque to the loop and the loops will continuously rotate. In practical applications an electric motor have a large number of loops attached to the coil armature and the magnetic field is generally produced by large electromagnets. Mainly two types of electric motors are widely used and there is slight difference between the working principles of DC and AC electric motors. Working of DC and AC electric Motor: In DC electric motor electricity to the armature coil is supplied through a commutator. Commutator reverses the current after every half cycle so that the torque applied to the armature is in one direction only and thus the coil rotates in single direction. In an AC electric motor the AC current is passed through the rotating contacts. These rotating contacts are also called brushes and the main disadvantage of these AC motors is that a part of energy is wasted as heat, which also shorten the life of the electric motor, however in an AC motor the magnetic field is also produced by same AC voltage (Hyper Physics, n.d.).