Homework SourseA commutator reverses the direction of the current in a loop
A commutator reverses the direction of the current in a loop within a motor. What is the purpose of a commutator?
| a) By reversing the direction current, the magnetic torque on the loop is maintained in the same direction. |
| b) The reduce mechanical friction |
| c) To reduce electrical resistance |
Solution
First is the correct answer.
a) By reversing the direction current, the magnetic torque on the loop is maintained in the same direction.
To keep the torque on a motor from reversing every time the coil moves through the plane perpendicular to the magnetic field, a commutator is used to reverse the current at that point. So that torque remains in same direction. Try to see some 3d GIF files on google to better understand it. Thanks
