The motor acts on the principle that a current carrying conductor in a magnetic field experiences a force.
When a current flows through the coil it has the effect of making the coil rotate about the axis XY.
When the coil is perpendicular to the magnetic field the direction of current must be reversed if the torque is to remain in the same direction.
This is achieved by means of a split ring commutator.
The commutor ensures that the brushes (supplying the current to the coil) are constantly in contact with the side of the coil which maintains the brushes with constant polarity.
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