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Old Jan 12, 2004, 09:54 PM
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Here is most of that lot after an evening in front of the TV with some tools:
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Old Jan 12, 2004, 09:57 PM
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Finally, here's the CD-ROM motor up close, with the 30 tiny neos I just received from George at Engineered Concepts. I just ordered them Friday, and had them in my hands today! I plan to use them with my smaller 22mm version from earlier posts.

Tony Turley
Old Jan 13, 2004, 12:17 AM
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thanks guy i'll go for better magnet
Old Jan 13, 2004, 07:10 AM
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t-turley Finally, here's the CD-ROM motor up close, with the 30 tiny neos

Hi Tony,

What are the dimensions of the magnets? and are they listed on George's homepage or elsewhere?

Thx Roger aka GIFLYRC
Old Jan 13, 2004, 07:13 AM
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Roger, see:
http://www.engconcepts.net/Magnets/P...x_Magnets.html
or
http://www.supermagnete.ch
Last edited by Ron van Sommeren; Jan 13, 2004 at 09:28 AM.
Old Jan 13, 2004, 07:19 AM
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Quote:
Originally posted by t-turley
Here is one I thought rather interesting. It turned out to have 24 stator poles and 16 magnets poles. Any hope for this one Ron?
Yes. You could turn it into an lrk motor with 20, 22, 26 or 28 magnets. Or you could wind it as a classic motor. Search for messages by 'torquepoint' or 'herbert kabi' on www.yahoogroup.com/groups/lrk-torquemax
He did a number of posts on larger stators. The search is only 200 messages at the time, brilliant , not my idea of a search, you have to press 'next' repeatedly.

Groeten ;-) Ron
Last edited by Ron van Sommeren; Jan 13, 2004 at 09:29 AM.
Old Jan 13, 2004, 08:03 AM
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Lipoly not Lipo-suction
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Jeff, thanks for the tips. Have motors and motivation. Lets see what comes next (lol)

Cranky
Old Jan 13, 2004, 11:08 AM
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Quote:
Originally posted by ROGER GANTZ
Hi Tony,

What are the dimensions of the magnets? and are they listed on George's homepage or elsewhere?

Thx Roger aka GIFLYRC
Roger,

The magnets shown are 5 x 1.5 x 1mm, and I'm going to set them up NN SS NN, to effectively give me 3mm magnets segmented in the middle of each magnet. They are indeed on George's site.

Tony Turley
Old Jan 13, 2004, 08:41 PM
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More pics. This one looks interesting. 12-pole stator and 16-pole magnet:
Old Jan 13, 2004, 08:43 PM
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Out of the parts box, with a couple of completed "brothers". Always looking for that next great "find".
Last edited by t-turley; Jan 13, 2004 at 08:48 PM.
Old Jan 13, 2004, 08:50 PM
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Looks like we could have a winner! Dopplewhopper, anyone? I just need to pull off all of that tape from previous windings, clean the stator, and paint it with clear nail polish.

Tony Turley

PS: Hey, Ron. I don't know much about the theory behind these things. Is it possible to have a 9-pole stator and 15-pole drum? IIRC, there was something buried deep in one of these threads saying the magnet poles have to be a multiple of 3 if using a 9-pole stator.
Last edited by t-turley; Jan 13, 2004 at 09:03 PM.
Old Jan 13, 2004, 10:37 PM
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Tony, you don't need much theory in this case, 15 is an odd number, the number of magnetpoles must be even for symmetry/balance reasons. Otherwise, somewhere on the ring, you would end up with two neighbouring magnets having the same polarity.

The stator has to have 3,9,12,etc. teeth because we use 3-phase controllers. Were we using 5-phase controllers, the number of teeth should be a multiple of 5.
Last edited by Ron van Sommeren; Jan 13, 2004 at 10:48 PM.
Old Jan 13, 2004, 10:39 PM
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Three magnetsizes available at http://www.aircraft-world.com:
http://aircraft-world.com/shopdisplayproducts.asp?id=30

Magnets can be combined into bigger magnetpoles (cascading, length- and/or breadth-wise).

Groeten, Ron
Old Jan 14, 2004, 06:11 AM
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RIP "Long Shadow Flyer"
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My first rewind motor (original magnet) was sucessful, Amazing it actually works!!
The mount made from the weld nut (or T NUT)really works great! So far the only problem seems to be with my Jetti controller if you try to accelerate too fast the controller shuts down, but if you increase speed slowly it works great, anyone have any thoughts on this..

link to more pictures
http://www.fototime.com/inv/ED864A1A51BEC93

Carl
Last edited by crvogt; Jan 17, 2004 at 08:24 PM.
Old Jan 14, 2004, 11:18 AM
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Carl-

Well done! That's a great use of available materials.

As for the problem when accelerating too quickly, my CD-ROM motor did exactly the same thing until I replaced the stock ring magnet with N45 magnets from engconcepts.net. That cured the problem completely.

- Jeff


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