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Old Apr 08, 2004, 01:52 AM
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One Hour CD ROM Construction Part 5

continued from here http://www.rcgroups.com/forums/showt...5&pagenumber=1

Part 5 already!
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Old Apr 08, 2004, 01:58 AM
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Niagara Falls/Toronto area
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For those looking for past threads:

Part 1: http://www.rcgroups.com/forums/showt...hreadid=127606
Part 2: http://www.rcgroups.com/forums/showt...hreadid=174595
Part 3: http://www.rcgroups.com/forums/showt...hreadid=204419
Part 4: http://www.rcgroups.com/forums/showt...5&pagenumber=1
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Old Apr 08, 2004, 03:41 AM
MSDP
Daegu, Korea (South)
Joined Jul 2001
279 Posts
Let's make CD ROM!!!! NOOOOO, CD ROM brushless motor!!!
Thanks all for share.

Jae-Kwang
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Old Apr 08, 2004, 06:48 AM
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Gothenburg, Sweden
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Quote:
Originally posted by rysium
Thanks Ron,

You are the 'guru' so I though I'd better ask before I do something stupid. So I guess for my project (high torque DD) 24 magnets would give me more torque with about 5-6grams penalty. If I can get away with 12 magnets (for lighter and for cheaper motor), I will stick to it. However if I will not get my 20oz thrust I will have to addanother 12 magnets (6grams and 4 bucks more).

I will let youi know the results.

Richard
Why not try a 14-pole motor? I plan to do just that when my stators arrive. With 4mm wide and 1.5mm thick magnets.

Winding according to the table Ron posted should be: ACaBAbCBc

/Erik
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Old Apr 08, 2004, 07:49 AM
Look what I did:D
plumb's Avatar
orlando,Fl
Joined Mar 2003
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three doesnt divide into 14 too well. cant see how youll get more torque youll have magnets opposing a phase. right?
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Old Apr 08, 2004, 07:50 AM
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Gothenburg, Sweden
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Ill let Ron explain that.

But as you can see a special winding is needed and yes, it does work.

The LRK motors are either 14 pole too, FWIW.

/Erik
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Last edited by Erik Johansson; Apr 08, 2004 at 08:00 AM.
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Old Apr 08, 2004, 08:37 AM
Impossible? Hah!
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Oslo Fornebu, Norway
Joined Jun 2003
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LRK are 14 magnet pole yes, but also 6 or 12 statorpoles. This makes the equation completely different.
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Old Apr 08, 2004, 08:55 AM
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Quote:
Originally posted by KreAture
LRK are 14 magnet pole yes, but also 6 or 12 statorpoles. This makes the equation completely different.
Yes of course, I was just considering what he said about that 3 (phases) doesnt divide into 14 too well.

Im not getting into the technical discussion without more info so Ill hope that Ron can explain this. I know he have discussed in in other threads and in the table he posted the 9 teeth / 14 pole combination was not marked as a "bad combination", so I trust that until its proven wrong.

http://fast-results.com/lnl/nutpol.htm

/Erik
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Old Apr 08, 2004, 09:15 AM
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Albuquerque Intl, New Mexico, United States
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I just built a 14 pole motor and it definitely works. Now I am waiting on different batteries for more detailed results. So far I have tried it with 3 cells and it pulls 6.2 amps WOT with a GWS 10x6 HD. Want to try it with 2 cells and a SF prop. - Brian
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Old Apr 08, 2004, 10:01 AM
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Houston, Tx.
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The latest one I 've built turns a 10x6 DD at 2.9 amps. It has 12 -12 x 4 x1 magnets and doublestacked stator. The magnet spacing is to wide at only about 60% coverage.
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Old Apr 08, 2004, 10:03 AM
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This is quite addicting!
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Old Apr 08, 2004, 10:07 AM
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yep
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Old Apr 08, 2004, 10:31 AM
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Re: One Hour CD ROM Construction Part 5

Quote:
Originally posted by arx_n_sparx
couldn't find the wire, Tony, but this tubing looks interesting......
Go to page 715 of their online catalog. The magnet wire is at the bottom of the page.

Tony
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Old Apr 08, 2004, 10:33 AM
homo ludens modellisticus
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The Netherlands, GE, Nijmegen
Joined Feb 2001
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Quote:
Originally posted by Erik Johansson
Ill let Ron explain that.
But as you can see a special winding is needed and yes, it does work. The LRK motors are either 14 pole too, FWIW.
Guys, the table is not mine, it's from Ludwig Retzbach (the 'R' in lrk). It's all about pole/magnet overlap, which pole should attract and which pole should repel. If a coil attracts a magnet it will repel the magnet if you wind it the other way round.
Groeten Ron
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Last edited by Ron van Sommeren; Apr 08, 2004 at 10:55 AM.
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Old Apr 08, 2004, 10:45 AM
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I found this on page 107 of the McMaster-Carr catalog:

#50295K29

Metric Seamless Carbon Steel Tubing 12 mm OD, 9 mm ID, 1.5 mm Wall, 6' Length
$ 14.65 Each


They have a range of metric sizes. I know very little about metallurgy, so would carbon steel tubing in short lengths be suitable for motor mounting?

Tony Turley
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