AC Permenent Magnet Motor

[gotoluc]

Hi Luc
Interesting video,thanks for posting.
A couple of questions,would not the mass of the magnet affect the frequency at which it vibrates? and,are you driving the coil directly off the sig.gen?
Thanks again.
peter

Hi Peter,

thanks for looking at this topic.

Glad to see you are thinking ....I do agree with you that the mass of the magnet could have an effect on the oscillation speed or movement of the magnet.

It's also has been suggested to me that Marco's setup coil has a Ferrite core to which could also effect the results.

I will be retesting with a ferrite core coil and different size magnets to see how this has an effect on the frequency.

Stay tuned

Luc

[petersone]

Hi Luc,
Thanks for the answer,always nice to find I maybe thinking along the right lines,what about the second question?did you power the coil directly off the sig.gen?  I only ask as I have one, Wavtek23,that I haven't used yet,it may give me something to use it on!!!
peter

[gotoluc]

Hi Luc,
Thanks for the answer,always nice to find I maybe thinking along the right lines,what about the second question?did you power the coil directly off the sig.gen?  I only ask as I have one, Wavtek23,that I haven't used yet,it may give me something to use it on!!!
peter

Hi Peter,

yes, I used the output directly out of the Wavetek but I think you will need a coil with many winding to create a field at such a low frequency.

Have fun and let us know what you find.

Luc

[poynt99]

Thanks Luc.

This is an electro-mechanical resonance phenomenon, and has nothing to do with Schumann's frequency. It is a coincidence that it falls in the same frequency range.

Try two things if you can, 1) put two of those magnets together (double the mass) and try it again, and 2) try a disc magnet of much larger diameter. In both cases you will probably get closer to the 7.8 Hz observed in the dancing magnets video.

.99

[poynt99]

Luc,

I should mention that for AC current, your meter is rated for 1% accuracy from 40Hz to 10kHz. Down around 7Hz the meter is going to read quite a bit lower than true, so you are probably using a lot more current than what is indicated.

Just something to be aware of.

.99