Download video: 3D Printed Solenoid Motor
Channel: Princeton Concepts
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Video includes CAD animation (Creo), photos 0:30, test of first version 0:43, test of revised version 1:28, and a short high speed clip 2:44.
The revised version uses snap-action roller switches instead of brass contacts for device-to-device uniformity and more efficient operation. A diode was placed across each coil to eliminate contact arcing on break due to the collapsing magnetic field.