Tag Archives: rms

Levitation of a coil

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A coil being levitated above a copper plate by eddy current repulsion

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.
“Continue reading” for further examples and calculations. 5 photos and links….
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MOT low voltage rewind

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MOT with second winding

A microwave oven transformer can be used for a powerful low voltage supply.
“Continue reading” for construction details of this modified low voltage transformer.
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SIDAC Spark Substitute Solid State Tesla Coil (SSSSSTC)

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SIDAC's are devices that break down at a certain applied voltage. Put enough of them together and you get a (sort of) spark gap.

This is my earliest use of electronics to drive a solid state Tesla coil using  SIDAC’s in place of a spark gap. It is a proof of principle coil rather than a big performer.  “Continue reading” for more details and photos.  Continue reading →