This is a magnetic field meter or Gaussmeter which uses a UGN3503 Hall effect device to drive a meter. It shows the magnetic field sensor reading the strength (in Tesla’s) of a small horseshoe magnet. The meter is not yet calibrated so the reading is not correct.
“Continue reading” for circuit diagrams and specifications. 2 photos and links…
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A Hall effect array is one of many different types of magnetic sensors.
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Eddy current repulsion can provide enough force to give levitation of a coil. The coil was out of a defibrillator output circuit. Don’t know number of turns but the inductance is 10 mH (I think). It is drawing 6.5 A at 100 V AC to get the lift of about 1/2 inch off a 1/4 inch copper plate. It is tethered like a conventional lifter. The power is over 600 W so gets hot quickly.
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My first magnetic levitation project setup lifting a NIB magnet working after a week of adjusting and testing. A NIB magnet with some metal pipe is supported motionless, 1 inch below the coil. “..look Ma, no hands..”
“Continue reading” for development of a display, circuits and components. 6 photos and links.
Diamagnetism with Bismuth stabilises levitation
Diamagnetic levitation using bismuth plates to stabilise the magnetic lift of one permanent magnet by another. This is the classical setup with a small cube magnet between two bismuth plates. “Continue Reading” to see the video, a cool Bismuth crystal, 6 photos and links…
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The Levitron (R) is a small spinning top like magnet that is fully hovering in mid air unsupported. It is rather critical in its dimensions and operation. This requires adjustment by very small weight changes. It is commercially made and sold as a science toy. See their site for details.
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A model boat demonstrates magnetohydrodynamics. In one of its forms it gives electrical propulsion with no moving parts by applying an electric current to a fluid in a magnetic field generating thrust. This applies to any conductive fluid including water (preferably salt), liquid metal or plasma. Here I am demonstrating the principle with water.
“Continue reading” for further explanations and using powers up to 1 kW. 8 photos and links..
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My magnetic levitation display keeping a magnet spinning in mid-air.
After my earlier proof of concept Magnetic Levitation 1 it was time for a serious setup.
“Continue reading” for full display set-up in a science museum. 8 photos, video and links…
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A black oily magnetic liquid forms strange spikes when a magnet is applied. Ferrofluid is a bizarre fluid that is magnetic made of nano sized magnetite particles contained in micelles in a mineral oil base.
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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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