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Old Jan 02, 2004, 01:21 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
10,791 Posts
Three English cd-rom conversion pages in the first message of this thread:
http://www.rc-unionen.dk/nytforum/to...p?TOPIC_ID=368

Groeten Ron
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Last edited by Ron van Sommeren; Jan 06, 2004 at 12:41 PM.
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Old Jan 03, 2004, 08:06 PM
Acer's Avatar
Loveland, Colorado
Joined Mar 2000
1,997 Posts
Well, I put this on the 10 gram BL motor thread, but it's more pertinant to this thread.....

Well, here's my first attempt at making a CD-ROM motor. The winding is double 18T using 30 gauge wire in the Delta configuration. I attached a 4.75x4.75 APC prop to it and on a 3-cell 1200 ETEC its RPM is 15,000 and the amp draw was 9.7A.

I didn't reset my ESC for 0-5 degree timing yet. This is also using the stock ring magnet. I'll have the neo 5x5x1 magnets on it when they arrive on Mon./Tues. When the new magnets are on it and when I set the timing on my ESC I should have a motor that pulls less amps and spins the 4.75x4.75 prop a little faster.

AUW is .6 oz.

Here's a couple of pics.

-- Acer
http://speedwing.net
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Old Jan 03, 2004, 08:09 PM
Acer's Avatar
Loveland, Colorado
Joined Mar 2000
1,997 Posts
Here it is with the 010 for size comparison. I got lucky with this one since it was already ball bearing raced and had a very good 3mm shaft for prop adapters.

The 010 on 3-cell 1200 ETECs spins the 4.75x4.75 prop at 15,000 r.p.m. at 6.9A while this one spins the same prop at 15,000 r.p.m. at 9.7A. The amp draw should go down and the r.p.m. should go up when I change out the magnets and reset the timing in the ESC.

This motor weighs in at .6 oz. while the 010 weighs 1.3 oz. The BEST part is that this motor was absolutely free while the 010 cost me $80.00

-- Acer
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Old Jan 03, 2004, 09:29 PM
Ego varius quis.
Cheesehead's Avatar
Wisconsin
Joined Nov 2003
1,928 Posts
Nice job!
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Old Jan 03, 2004, 11:05 PM
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ssatoru's Avatar
Chiba, Japan
Joined Jan 2002
1,044 Posts
Quote:
Originally posted by Cheesehead
Has anyone tried the motor from a laptop's HDD or CD-rom drive? I was thinking of going brushless for my second plane, and need something about the size/weight of an IPS. It's a Hobbico F/F Zero, if anyone wants to know.
Hobbico F/F Zero is a good candidate for CDROM motor discussed here. It is the same as Union micro Zero available here and some are already flying with it. One of my club member flies with modest winding and ET700 2S. These CDROM motor dia is about 1 inch and will fit in the nose.
I am not familiar with thin laptop CDROM motor but maybe tougher to convert due to its thin size. I am not sure the Zero like IPS either. Many flies with direct 50XC motor. CDROM motor can give more power.

Satoru
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Old Jan 04, 2004, 01:24 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
10,791 Posts
Quote:
Originally posted by Cheesehead
Has anyone tried the motor from a laptop's HDD or CD-rom drive? I was thinking of going brushless for my second plane, and need something about the size/weight of an IPS. It's a Hobbico F/F Zero, if anyone wants to know.
HDD stators usually have 12 statorteeth, whereas cd-rom motors have 9. You can use a HDD stator for lrk-motors. Search for 'hard(-)disk' 'HD' or 'HDD'. CD-rom and HDD stators have completely different winding diagrams. The number of magnetpoles is also different, 10 or 14 for a HDD lrk motor, 12 magnets for cd-rom motors. Lot's of lrk from HDD stator experience in the lrk group:
http://www.yahoogroups.com/group/lrk-torquemax/

Ron van Sommeren
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Old Jan 04, 2004, 05:45 PM
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galloping gimp's Avatar
Ohio, USA
Joined May 2002
1,623 Posts
"Potted" Stator

Some outrunners, like my PJS 300, have the stator "potted" or encased in a kind of protective compound.

Is this to protect the windings from damage or to prevent them from loosening? Is it desireable to do this with our homemade CD-ROM brushless motors?

If so, what substance should we use? Epoxy? Epoxy with microballoons? Something else?

Thanks!

- Jeff
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Old Jan 04, 2004, 05:46 PM
K4UAV
dalbert02's Avatar
Miami, FL
Joined Jul 2003
1,749 Posts
Has anyone thought about using different types of wire for the windings? Such as Litz wire or even square wire (instead of round)? I know that the most efficient audio speaker drivers use square wire on the voice coil to increase efficiency. Litz wire is ultra fine wire individualy enameled and then woven to the proper ga diameter. MWS Wire Industries http://www.mwswire.com/ carries these types of wire, but the last time a placed an order the minimum was 2,200 feet. If these ideas have already been tried and the results not worth the effort, I'd like to know before I order so much wire. I still have about 2,000 feet of 26ga wire I ordered almost 10 years ago for an electromagnetic rail gun. Any thoughts?

"One carefully controlled experiment is often times worth more then 1,000 expert opinions."
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Old Jan 04, 2004, 08:58 PM
Ego varius quis.
Cheesehead's Avatar
Wisconsin
Joined Nov 2003
1,928 Posts
Okay, thanks. Plain old CD-rom motor it is, then.
Now, if someone had a good design for a homemade ESC....
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Old Jan 04, 2004, 08:59 PM
Registered User
Tokyo, Japan
Joined Nov 2002
866 Posts
Re: "Potted" Stator

Jeff,

>If so, what substance should we use? Epoxy? Epoxy with >microballoons? Something else?

It is called "liquid coating rubber".

http://www.jefcom.co.jp/shop/pdf/185.pdf
(sorry, it is only Japanease page)

Takao
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Old Jan 04, 2004, 10:29 PM
Registered User
Edmonds Wa. (Seattle)
Joined Nov 2003
3,926 Posts
Thought you all may want to see the latest to come out of the Little Screemers shop!
This is a small motor I think a SCSI drive.

Bell 22mm
stator 19mm
24T of 26 gauge
24 5x2.5x1 N45 magnets
motor mount Nylon

Weight is 11.3 grams
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Last edited by Littlescreamers; Jan 04, 2004 at 11:29 PM.
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Old Jan 04, 2004, 10:30 PM
Registered User
Edmonds Wa. (Seattle)
Joined Nov 2003
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2nd pic
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Old Jan 04, 2004, 11:24 PM
De-Brushed user
Midland, Tx / W. Lafayette, Ind.
Joined Dec 2002
2,949 Posts
11.3 g, thats the lightest ive seen so far. That nylon mount helps alot, i bet.
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Old Jan 04, 2004, 11:33 PM
Registered User
Joined Oct 2003
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Now that a LITTLE SCREEMER if I've ever seen one,you da man Scott!!!Matt
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Old Jan 04, 2004, 11:34 PM
Registered User
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Thats what we're lookin' for CAFplanekid. Matt
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