Homopolar motor is a simple motor.
Demonstrating it sometimes a bit tricky especially for younger kids, the wire keep falling off from top of battery.
We
...さらに表示 created a sleeve to be placed on top of AA battery to keep the wire from falling, hence continuous fun and rotation :)
You can print the optional "Motor" text.
Additional parts : wire (~22 cm), Strong magnets (3-4 pcs) , AA battery.
From Wikipedia:
The homopolar motor is driven by the Lorentz force. A conductor with a current flowing through it when placed in a magnetic field which is perpendicular to the current feels a force in the direction perpendicular to both the magnetic field and the current. This force provides a torque around the axis of rotation. Because the axis of rotation is parallel to the magnetic field, and the opposing magnetic fields do not change polarity, no commutation is required for the conductor to keep turning. This simplicity is most readily achieved with single turn designs, which makes homopolar motors unsuitable for most practical applications
