Magnetic levitator

thingiverse

In 1842 Samuel Earnshaw stated, that there can be no such a thing as magnetic levitation done solely with stationary magnets. There has to exist at least one external force in order to sustain stable levitation. Nowadays we call it a Earnshaw’s theorem. This device allows stable levitation of a small magnet via external force created by diamagnetic surroundings (pyrolitic graphite (ebay)). Diamagnets reacts to the external magnetic field in such a way, that they repel the magnetic field (they act against it) thus creates an external stabilizing force for the small magnet. Small magnet is actually lifted by the big magnet in the top, but without graphite, there would be no stable position for the small magnet to levitate (it would stay on the bottom plate, or would be pressed against the graphite holder). This device shows, how subtle diamagnetic force can be utilized for fun and education. Small magnet can be easily rotated by blowing air and it will rotate for quite a long time before it comes to a stop (https://youtu.be/QUugLxMSQSQ). Only thing needed is to stabilize the small magnet in small gap in-between the two graphites. You do it only by rotating the screw until you are in the equilibrium with the gravity. Print Settings Printer: Prusa MK2 Rafts: No Supports: No Resolution: 0.2 Infill: 10% How I Designed This Autodesk Inventor I am willing to share the design. :) Overview and Background Basics of material science This could be useful when speaking about paramagnetic/diamagnetic/feromagnetic materials. Lesson Plan and Activity Activity Try to find the stable position of the small magnet without graphite (by turning the screw). One can find equilibrium of magnetic dipolar force and gravity. Add top graphite. Leave big gap. 2 stable positions are found. On the bottom and on the top. Both allows levitation. Adjust the gap so the magnet levitates in the middle. Blow air so it rotates. Try illuminating it with a laser! With a nice symmetric magnet you will get rotation. Materials Needed Materials 1x big lifting magnet (NdFeB - 12x12x12 mm) 1x small magnet (NdFeB - smaller than graphite) 2x graphite sheets (20x20x1 mm (ebay)) 2x M3 screw