menu search
person
Draw a labelled diagram of an electric motor. Explain its principle and working. What is the function of a split ring in an electric motor?
thumb_up_alt 50 like thumb_down_alt 0 dislike
17 views

1 Answer

 
verified

Principle: It works on the principle of the magnetic effect of current. A current-carrying coil rotates in a magnetic field. 

 

Working: When a current is allowed to flow through the coil MNST by closing the switch, the coil starts rotating anti-clockwise. This happens because a downward force acts on length MN and at the same time, an upward force acts on length ST. As a result, the coil rotates anti-clockwise.

Current in the length MN flows from M to N and the magnetic field acts from left to right, normal to length MN. Therefore, according to Fleming's left hand rule, a downward force acts on the length MN. Similarly, current in the length ST flows from S to T and the magnetic field acts from left to right, normal to the flow of current. Therefore, an upward force acts on the length ST. These two forces cause the coil to rotate anti-clockwise.
After half a rotation, the position of MN and ST interchange. The half-ring D comes in contact with brush A and half-ring C comes in contact with brush B. Hence, the direction of current in the coil MNST gets reversed.
The current flows through the coil in the direction TSNM. The reversal of current through the coil MNST repeats after each half rotation. As a result, the coil rotates unidirectional.

 

The split rings help to reverse the direction of current in the circuit. These are called the commutator.

thumb_up_alt 50 like thumb_down_alt 0 dislike

Related questions

thumb_up_alt 50 like thumb_down_alt 0 dislike
16 views 1 answer
thumb_up_alt 50 like thumb_down_alt 0 dislike
4 views 1 answer
thumb_up_alt 51 like thumb_down_alt 0 dislike
198 views 1 answer
thumb_up_alt 50 like thumb_down_alt 0 dislike
21 views 1 answer
thumb_up_alt 50 like thumb_down_alt 0 dislike
4 views 1 answer
add_circle_outline
...