MOTOR PRINCIPLE

 1.     In this motor model, the power (conventional
current flow) flow though the brushes and connect to
the commutator pin. It causes it to become a DC motor.
According to the RHR #2, the direction of conventional
current flow is shown in the picture which located at the
middle. After using the RHR #2, we could predict the
direction of the force by using the RHR #3. The direction
of the force at the left side is different from the right
side’s, so the cork could spin.

.

 2.     Then, after the motor spins half way of a circle, the
commutator pins touched another brush (not the brush
 that has been touched before the motor spins) that
changed the direction if the current and also the direction
of forces changed, too.

 
3.     After the forces changed when the motor reached
the half way point, the motor continues to spin and
it changed its forces while it meets another half way
point, and it spins more and more that forms a loop.

 

Now， the loop has been formed and the cork can spin
nicely until there is no power anymore.