5H25.20 - Magnetic Suspension
Demonstrate that magnetic forces can suspend an object. Demonstrate a feedback controlled system. Demonstrate Active suspension/levitation.
Obtain the 15VDC 1A power supply, the generative designed stand and wooden base, 1" NdFeB cylindrical magnet, empty Campbell's Tomato soup can, two banana cables, and a camera with backplane. Plug the power supply into the wall and connect two banana cables to the power input on the side of the clear acrylic box housing th electronic control circuit. Place the camera viewing the assembly from the side, with a backplane behind the assembly.
Turn on the power supply, and gently lift the magnet or soupcan/magnet into place.
Active suspension or levitation can be created using an electromagnetic coil and feedback system. In this demo, an electromagnet is controlled by a hall effect sensor which flips the polarity of the electromagnetic ~300-400 times per second. The coil is driven by a half-bridge motor driver with input from a fan driver and hall effect sensor. This is a demonstration of active suspension, where as a superconductor or graphite displays passive suspension or levitation involving no active controls and are material properties alone.