how does split rings reverse the direction of current in a electric motor ?
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actually electric motor works on Fleming left hand rule when it is moved in split ring which is a device that act as commutator reverse the current direction
bhavin10:
is this correct answer
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As you can see the commutator consists of two round copper pieces. A piece of graphite is lightly pushed against the copper to conduct the electricity to conduct to the armature. It's often called a carbon brush. It assures the flow of current to the armature coil. When current reaches armature coil, it develops a magnetic field and tends to align with the external permanent magnetic field. So the coil rotates. This also makes the commutator to spin and each time when the commutator spin, the carbon "brushes" against the copper. As you can see, as the motor rotates, each copper piece connect to the brush on every half turn. But the two copper pieces never touch each other. There is a "split" in between the pieces.
Now let's see how this commutator could reverse the current. We, first have a current coming in from the left. The carbon (graphite) brushes the copper and so this current flows to the armature coil. The armature coil rotates. So the commutator in contact with the armature also rotates. The wire on the left side has the current direction same. So the armature keeps on rotating in the same direction.
Once the coil completes half a turn (just ignore we have a commutator), then the forces on the coil will be opposite. So the coil has a tendency to rotate in the opposite direction. But no need of worry. We have the commutator. Once the coil has done a
180
0
1800
rotation, the commutator also makes one. Remember that the current through the coil is dependent on the copper piece contact with the carbon. Here the right copper plate appears on the left side which means the part of coil which was initially right (carrying a current downwards) now appears at the left. The copper plate conduct current from the left. So the current in the coil becomes opposite. Thus the forces again reverse which makes the coil to continue it's rotation along a single direction.
So the commutator reverses the current in every half turn producing a steady torque and the armature coil rotates in a single direction.
I explained up to my best. Hope this helps
Now let's see how this commutator could reverse the current. We, first have a current coming in from the left. The carbon (graphite) brushes the copper and so this current flows to the armature coil. The armature coil rotates. So the commutator in contact with the armature also rotates. The wire on the left side has the current direction same. So the armature keeps on rotating in the same direction.
Once the coil completes half a turn (just ignore we have a commutator), then the forces on the coil will be opposite. So the coil has a tendency to rotate in the opposite direction. But no need of worry. We have the commutator. Once the coil has done a
180
0
1800
rotation, the commutator also makes one. Remember that the current through the coil is dependent on the copper piece contact with the carbon. Here the right copper plate appears on the left side which means the part of coil which was initially right (carrying a current downwards) now appears at the left. The copper plate conduct current from the left. So the current in the coil becomes opposite. Thus the forces again reverse which makes the coil to continue it's rotation along a single direction.
So the commutator reverses the current in every half turn producing a steady torque and the armature coil rotates in a single direction.
I explained up to my best. Hope this helps
this answer helped me a lot
thank you
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