Eddy Current Transmission Drive

construction sign

I came across this idea on a British website called, RMweb. At post #160 the Australian ModelTorque was mentioned. I found more information at Model Torque. I spent almost one year trying to find out how this thing worked. I knew it used magnets, but how? After much research the light bulb went on. They had mentioned in that post "eddy current". A Google search revealed all sorts of info on "eddy current" including this company K & J Magnetics from which I order the magnets from, now that I understand how an eddy current clutch works. K & J Magnetics also has a great Blog describing how eddy current works. Saving me much typing in trying to explain how it all works.

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I won't bore with all the research and test platforms I built to get to this bench mark. I believe I have come up with a test bed chassis where I can test different strength magnets and different configurations of this unique drive system for model railroading.

Eddy Current Transmission Drive

The major points of interest have been pointed out. Miniature ball bearings are used in the drive line to the gear towers. Somewhere down the R & D line I will add ball bearings to the drive axles and gear tower.

Eddy Current Transmission Drive Parts

This is the major part of the eddy current drive. If you have visited the K & J Magnetics blog you will have an understanding of how this works so I won't go into how it functions. The diameter of the whole clutch is 3/4". the length is .800" with .500" length for the part that holds the magnets and .300" for the other part. Miniature ball bearings are used for smooth running. The size of these bearings are 3/32" X 3/16" X 3/32" and can be bought atVBX Ball Bearing. and are part number R133ZZ. The neodymium magnets are 3/16" X 3/16" axially magnetized and nickel plated. They are secured in the holes with Loctite© #290 Threadlocker.

Eddy Current Clutch Parts

This is were the project stands right now. I plan on doing a video as soon as I get a test track set up where I can measure

draw bar pull. Stay tuned for further developments by checking to for updates which will be noted on the home page.

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