Author Topic: Magnetic spin top drive  (Read 176 times)

Offline haversin

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Magnetic spin top drive
« on: May 16, 2021, 02:58:36 AM »
I modified the solar pendulum drive circuit from here:
https://nutsvolts.texterity.com/nutsvolts/201208?pg=32#pg32
to make a magnetic spin top drive:


Offline klugesmith

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Re: Magnetic spin top drive
« Reply #1 on: May 31, 2021, 05:50:14 PM »
Very nice!  Do you think it would work as a synchronous motor, running coil at line frequency without feedback?  Perhaps with more than 2 poles on the rotor, for example orient the magnets NSNS. 

Offline Mads Barnkob

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Re: Magnetic spin top drive
« Reply #2 on: May 31, 2021, 07:51:54 PM »
This is a great little project, I will make this with my kids :) They love spinning tops in the first place, so making a circuit to help them keeping it spinning is going to be a hit.

I must have some of those fan motors around... I know they are somewhere...
https://kaizerpowerelectronics.dk - Tesla coils, high voltage, pulse power, audio and general electronics
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Offline haversin

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Re: Magnetic spin top drive
« Reply #3 on: June 01, 2021, 05:45:31 PM »
Do you think it would work as a synchronous motor, running coil at line frequency without feedback?
  I'm not sure how well this configuration would work as a synchronous motor because the stator is not producing a rotating magnetic field where the top is. Also I removed the copper shading turn to maximize flux density.
  I found that the NSNS magnet arrangement does not work well because the diametrically opposed magnets have the same polarity: N to N and S to S so when the top got between the two poles of the stator no torque was produced.

making a circuit to help them keeping it spinning is going to be a hit.
An even simpler circuit that uses just two coils and a transistor is shown on this page as “The Perpetual Top”
http://www.its.caltech.edu/~atomic/display/displaycase.htm

The down side of this circuit is that both coils need to have several thousand turns.
« Last Edit: June 01, 2021, 05:47:09 PM by haversin »

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Re: Magnetic spin top drive
« Reply #3 on: June 01, 2021, 05:45:31 PM »

 


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