
PROJECTS: Toothbrush Motors
power from the end cap’s contacts, which connect
to the battery.
The commutator switches the polarity of the
electromagnet armature coils so they alternately
attract and repel the permanent magnets to keep
the rotor spinning. To learn more, you can watch
Jared Owen’s animated electric motor tutorial at
youtu.be/CWulQ1ZSE3c.
EASY MOTOR REPAIRS
Small motors usually fail because the wire coils
are faulty, or the rotor does not spin freely, or the
electrical contacts on the end cap do not properly
contact the commutator ring.
If you have an inoperative motor:
1. Test the motor with a known-good power
source.
2. Ensure that ...