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Old Feb 26, 2006, 09:33 AM
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659 Posts
17T, finally :cool:

some hundreds of post-reads later, I've managed to put 17T on
a 20mm stator...not very neat but it works (pic1 below). On 2S
and 3S I get 30-40 grams less thrust than with my Lens17T20mm
on various props.

Also (pic2) I've wound 14T of 24awg on a Strong22.7mm kit...on
2S I get about 300-310 grams at 8-8.5 Amps WOT with an 8040 prop.

Thanks all for the info you so freely share,
Peter

ps. The motors/props interlude has ended...back to finishing my bottle
rocket (pic3)...
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Old Mar 02, 2006, 11:00 PM
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Sterling Heights, Michigan, United States
Joined Nov 2003
500 Posts
Here are a few of the motors I built. The first 3 on the right are contenders for the mega 16/15/4. The three center ones are just for comparison, but I do plan to rewind the GWS motor top center and the bp motor (left center) for a hotter wind. The GWS motor, top center has 12poles, so an LRK wind would be possible. The motor on the far left is a 20mm stator motor.

Kin

http://www.embeddedtronics.com/
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Old Mar 17, 2006, 11:54 AM
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Beaverdam Creek, VA
Joined Aug 2005
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Quote:
Originally Posted by ecologito
Here is what I got out of a Ditto Tape unit and mounted into a GWS gearbox.

I need to put some cooling holes
I like your mounting solution!

I got 5 tape drives for $16 shipped off of EBAY, there were 2 Colorado T-1000s, a Colorado 250MB, and a Colodaro 1400, as well as an Iomega Ditto 3020 (3.2 GB ?). All had 9 tooth stators, the Ditto having intermediate headless teeth. The Ditto is also a bit bigger, 36.5 vs. 34.5 for the others. The other motors were all different too, 2 from Japan and 2 from China (the T-1000s had one of each). The Japanese stators are 3 mm, the Chinese are 3.5, as is the Ditto, which is a Japanese motor.

I figure the thinner Japanese stators are better off being stacked, but there are some single stator motors at the Powerditto site ( http://www.powerditto.de./navigationengl.html ) so I thought I'd start with one of the 3.5 mm stators. I guess I got carried away, I wound 18t of 21g but it's too thick, both for the stator support and for can clearance. One of the other motors has a thicker stator support that might save me there, but the can clearance is going to be a problem. With a 3.5 mm stator and 5 mm magnets, the stator should be .75 mm into the can, mine is flush with the edge with no clearance. I may put this one aside and turn a custom can and stator support when I get a chance (and materials).

2nd try: 16t of 22g fit in 2 neat layers. The stator support for the other 3.5 thick stator is a little thicker, I think. The can that was with that stator has a plastic hub, so I'll use the can that was with the first stator. It looks like I'll have clearance with the stator the right depth in the can.

Now to get some magnets, I should have ordered them a week ago.

Good Luck!
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Old Mar 23, 2006, 09:38 PM
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Manuel,

You have some interesting motors there. Would you like to share some performance data?

Latrans
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Old Mar 24, 2006, 01:11 AM
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Beaverdam Creek, VA
Joined Aug 2005
2,322 Posts
Hey guys, on these ~35mm motors, the bearings are pressed on the shafts. Are you polishing the shaft to slide through the bearings like a CD motor? Any retaining clip? I haven't seen one pictured or mentioned at Powerditto.

Thanks and Good Luck!
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Old Mar 24, 2006, 07:53 AM
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I see some kind of paste/glue on some of the motors posted what is this for? See picture 3 post#2.
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Old Mar 24, 2006, 10:44 AM
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manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
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Quote:
Originally Posted by darkmask
I see some kind of paste/glue on some of the motors posted what is this for? See picture 3 post#2.
95% magnet coverage. no paste, black is permanent marker in up magnet.


http://www.rcgroups.com/forums/showt...&page=22&pp=15

Beavrdamelectric
i think (I DONT REMEMBER). i use new shaft. i dont need c clip. even in
12 x6 to 5800 revs.

Latran. i going to post data later.

Manuel V.
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Old Mar 24, 2006, 02:00 PM
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Beaverdam Creek, VA
Joined Aug 2005
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Quote:
Originally Posted by darkmask
I see some kind of paste/glue on some of the motors posted what is this for? See picture 3 post#2.
I think that's some epoxy he stuck on the coils to keep the wires from moving around.

Manuel, thanks! I polished the last 9mm of a shaft from a Colorado 1400 so that I could push a bearing onto it, then pressed it into the bell I'm using. I made some index marks for magnet mounting, drilled it, deburred and gave it a light polish with 400 grit.

I made a little bracket out of the 1400 mounting plate but I don't think it has enough length to be stable. I was thinking of putting a fillet of JB Weld in the back lower corners, but it won't help much. I should have bent it higher but I was afraid of messing up the threaded hole. To make it longer I need to make it narrower too.

I still need a thrust spacer to keep the can away from the windings, and a prop adapter.

Good Luck!
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Old Mar 24, 2006, 03:10 PM
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manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,216 Posts
I still need a thrust spacer to keep the can away from the windings, and a prop adapter.

I cut off bras tube. .5MM washer.
mount is made off Hard disk black back plate.
I dont use Prop. adapter. with APC i put a plastic ring center for 4mm. in rear and front one collar with nut and glue (collar propell only.)

Ditto Data. 70g. 2.46Oz.
21t. 25g 18n20p AaABbBCcC/AaABbBCcC Star. 2motor parallel. 9n10p
8300revs, .9A 11.32V 733kv
APC 10x7E 6200,9.6a,10.93v
APC 11x7sf 5000,14A,10.xxV.
APC 12x6E 5800,11.3A,10.87V. 31.6OZ, 76%efic. 32millas.

Motor With Komodo Bell V1.
18T 23g 1.5 Stator, Parallel=6t.
19050,2.0A,9.08v 2098kv.
Gunter W. 20100, 20A,10.5V

Motor with bigbell 20mm stator, 12 3m.magnets.
18t, 25g Delta.
APC 6x4E 15900, 13.3A 10.33V. 105w, out.

GB 22.7ml. 18t,25g 12 bp21 magnets.
14700, .4A 11.28V 1303 Kv.
GWS 9x5Hd. 5800, 5.6A,6.53V.
9x5 5000, 2.4A,11.38v,7.8Oz. w Power Supply 12V.
7400, 9.6A,10.88V,18 Oz. 3/4 WOT PSupply.
7600, 11.5A,10.7V, 19 Oz. WOT PSupply.
APC7x4SF 10200,8.8A,10.93V.


I end this proyect.

Today Up-date.

I put in a Cd motor in EDF Red flame blaster rotor.
20mm, 15t 26g, 6magnets.
11.22v. 3.9A 22,300 revs.
with 3sk340. for only 90g. weigth. with inlet and outlet.
only 90g vs 222g original motor and 6nicad.

Im flyer in JSW and power is ok. for sport flyer.

weight is 7.75 Oz.

Manuel V.
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Last edited by manuel v; Aug 27, 2006 at 08:45 PM.
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Old Mar 27, 2006, 09:17 PM
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Beaverdam Creek, VA
Joined Aug 2005
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I found a piece of aluminum tubing for a spacer, but no prop adapter yet. On 7.1 V it pulled 1.5 A and turned 8400 RPM no-load.

I had to turn the stator down a few thousandths to clear the 7x5x2's.

Good Luck!
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Old Mar 27, 2006, 11:51 PM
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Mexico, BC, Mexicali
Joined Aug 2004
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Beavrdam.

with APC you can put a plastic ring center for 4mm. (APC center) in rear and front one weel collar with nut and glue (collar propell only.)

for more security drill for second nut.

Manuel V.
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Old Mar 28, 2006, 12:20 AM
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Beaverdam Creek, VA
Joined Aug 2005
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Hi, Manuel

I'm not understanding, what keeps the prop from turning on the shaft? Can you take a pic?

Thanks and Good Luck!
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Old Mar 28, 2006, 10:03 AM
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manuel v's Avatar
Mexico, BC, Mexicali
Joined Aug 2004
5,216 Posts
what keeps the prop from turning on the shaft?

nut thigt to shaft.
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Last edited by manuel v; Mar 28, 2006 at 10:10 AM.
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Old Mar 28, 2006, 11:39 AM
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Joined Aug 2004
734 Posts
Manuel,

You built some interesting motors. I find that 20mm motor with the 3mm magnets especially interesting, running a single 20mm stator at 13.3 amps with an efficiency of 76.4% is really something. Do you like the way this motor runs, any problems with it?

Thanks for sharing your work .

Adam
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