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The SFK Project: #3 1-2-3-Motor
VdH
7
Volker de Haas started electronics and computing with a KIM1 and machine language in the 70s. Then FORTRAN, PASCAL, BASIC, C, MUMPS. Developed complex digital circuits and precise analogue electronics for neuroscience labs (and his MD grade). Later database engineering, C++, C#, hard- and software developer for industry (transport, automotive, automation). Ended up designing and constructing the open source PLC / IPC "Revolution Pi". Today engaged in advanced development as a service.

Comments

May 5, 2020 08:22

sorry I got it wrong the loops are verical not horizontal. I guess more loops might be better.

0 Votes

May 4, 2020 09:14

I assume we can add multiple horizontal turns ro improve the force/efficiency?

0 Votes
VdH

May 4, 2020 10:04

@tom bach The large horizontal turns are not primarily used for adding to the force but to lower the centre of mass (just like a tightrope artist uses a bent horizontal rod). This makes the balancing on the battery's top more stable. The direction of the two fields and the force is determined by the "3 finger rule": Take thumb, index finger and middle finger of one hand pointing in three dimensions (each 90° to the other two). If your thumb points upward, this would be the direction of the magnetic field of the Neodym magnet. Your index finger would be any wire 90° to the magnet (battery) axis. The middle finger represents the Lorentz force on this wire which is always 90° to the magnet axis and the wire axis. As the magnetic flux density decreases with the 3rd power of the distance, it doesn't really help to increase the horizontal length of the wire. It could be just a centimetre and you would get nearly the same Lorentz force (but it wouldn't balance as stable). If you would add more horizontal wire traces you would increase the Lorentz force on the construct. BUT every wire sliding on the magnet to make contact also increases the friction. You must also have in mind that a battery has an internal resistance which is limiting the current it can deliver. Using more wires would possibly not increase the overall current through the horizontal wires. So what do we learn from this: We must simply try and be not disappointed when current limit and friction will make the thing not spinning better;-)

April 29, 2020 12:37

A great mini project, is it OK if we share this on our podcast VdH?

0 Votes
VdH

May 1, 2020 09:42

@Geeks, We Are Your Father's Yes please do so! But to be honest geeks, I'm your grandfather...

April 29, 2020 12:40

This is great, thank you for sharing. I will try this with my children.

0 Votes
VdH

May 1, 2020 09:42

@SheldonCooper Good luck Sheldon! if you are faced with any problems please ask. But if you copy the wire bending I use the thing should run smoothly.

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