Homopolar motor made with 4 common household parts.
This homopolar motor has 4 components and takes seconds to make. Running here at 5800 RPM. It ran for 2:35 minutes once the power is off because the bearing is only a point with much of the weight taken off by gravity.
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The extensive construction details of this motor are mostly self evident. A round magnet with a flat headed wood screw needs to be well centred for fastest operation. The wood screw and magnet combination need to be able to support the combination with out falling off the battery.
Strip the wire ends a bit more on top and make it into a loop so that finger pressure can hold it more securely.
Note that this is a short circuit to the battery which supplies a lot of current and can get warm.
The simple components of a screw, battery, wire and NIB magnet are shown.
A laser tachometer and a little reflective tape shows the impressive 5889 RPM.
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Photo Date: 2006