Write the principle of working of an electric motor. Explain the function of the following parts of an electric motor:
Armature
Brushes
Split ring
Answers
Answer
⟹ Principle of working of electric motor: A coil carrying electric current placed in an external magnetic field experiences a force.
⟹ Function of armature: Enhances the power of the motor and induces motion.
⟹ Function of brushes: Helps easy transfer of charge between the coil and the external circuit.
⟹ Function of split rings: Reverses the direction of current after each half rotation of the coil so that the coil can keep rotating continuously.
Answer:
E xxplanation: the electric motor works on the magnetic effect of current its principle is when a rectangular coil is placed in a magnetic field and current is passed through it a force act on the coil due to which the coil rotates when the coil rotates the shaft attached to it also rotates. In this way electric energy supplied to motor is converted into mechanical energy.
ARMATURE it is a rectangular coil which contains a large number of turns of insulated copper wire wound on a soft iron core this coil is free to rotate between the pole pieces of the magnet
Spilt rings - they are simply brass ring which is divided into two parts these both parts are separated from each other and as soldered to the two ends of the coil this is spilt rings are mounted on the shaft of the motor and can rotate with the shaft
Brushes the spilt ring touch the two strips of graphite and these strips of graphite are called brushes. this Brushes are connected to two connecting screws the brushes are fixed to the base of the motor and are in contact with the half ring slightly.
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