
Assembly instructions for kit #17
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9. You may add two beads on the coil ends. These beads reduce the friction between the coil
and the stands.
If you want to measure the speed of your motor bend the coil ends as shown. Visit
http://simplemotor.com/motor-speed-measurement/ for information on how to measure
the speed of rotating coil in RPM.
Your motor is ready! Depending on the coil position the motor may start immediately or you
might need to give it a slight push. The motor usually spins in one direction so you should
try to spin it slightly in both directions.
If your motor doesn't work, ensure that the rotor is balanced and can rotate freely and
check the insulation. Properly removed insulation leaves shiny copper on one end. Half of
the other end should also have shiny copper color while the other half should be the color of
the original insulation as shown in step 3. Make sure the battery is fresh. If the motor still
does not work – check Troubleshooting section at our web site at www.simplemotor.com.
Clean carbon buildup (black stuff) on coil ends and metal stands often.
CAUTION: Do not leave the motor connected to the batteries if the rotor is stalled. This
motor consumes a lot of electricity and could drain the batteries quickly even if it does not
spin.
How it works
When un-insulated (bare copper) parts of the coil wire contact the metal stands the current
from the battery flows through the coil making it an electromagnet with North and South
poles. This electromagnet interacts with the permanent magnet (North and South poles
attract each other while the same poles repel). Motor starts to spin until the contact is
broken when an insulated part of the coil end comes into contact with the stand. However,
the coil continues to spin due to inertia and then the process continues. Technically
speaking this motor is a single pole pulse motor.