One hour CD ROM motor construction PART2 - Page 13 - RC Groups
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Jan 05, 2004, 01:34 AM
Why not Delta?
rysium's Avatar
I love these CD-ROM motors
The plane I have with it (Mini Depron Edge 540 Profile) has more relative power than the original Big Brother with Razor 300 (mini is 75% linear scaled down and weights a half of it's big brother), giving me over 12 minutes of 3D on 3x700 LiPo. I call it E-Z 3D trainer

Now back to the subject.
I have stripped down already over 30 CD-ROMS evaluatiing motors in there. The attached ZIP file has an Excel spreadsheet of 28 different CD-ROM models with some information what kind of motor is in there and some comments about conversions.

If you guis can add some more models I'll be glad to add it to this database. This will help me pick the right CD-ROM for demolition

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Jan 05, 2004, 01:44 AM
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It says the zip file is corupted?Couldn't get in,might be my machine though.Matt
Jan 05, 2004, 03:27 AM
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>Now, if someone had a good design for a homemade ESC....

I am debugging now. And I recieve a lot e-mails about my schematic.

This is the hint of my CD-ROM BL ESC design.

Last edited by Takao Shimizu; Jan 05, 2004 at 03:47 AM.
Jan 05, 2004, 07:40 AM
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Where did you find 24 magnets small enough to keep the weight that low?

Tony Turley
Jan 05, 2004, 09:26 AM
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I made them!
Jan 06, 2004, 01:48 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
Originally posted by Cheesehead
... Now, if someone had a good design for a homemade ESC....
Six brushless diy designs:
Originally posted by rcflyer2
Thought you all may want to see the latest to come out of the Little Screemers shop! ...
Plenty of space left in the slots. Thicker wire are two/three wires in parallel will improve efficiency, at the cost of weight of course.

Groeten Ron
Last edited by Ron van Sommeren; Jan 06, 2004 at 01:56 PM.
Jan 06, 2004, 10:55 PM
RIP "Long Shadow Flyer"
crvogt's Avatar
Having attempted to read ALL the post on the subject, Looks like I want to give this a try. IF I undersand the needed items to add to the parts list is a roll of 30 Ga magnet wire ( between the 26g - 32ga people have used) and some 5x5x1mm magnets. Am I correct if I get these item I should be able to create a usable motor??? Assumeing I have the winding skill, etc.

Jan 06, 2004, 11:20 PM
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Yes,there are larger and small cd rom motors,smaller ones fit 1mm mags and larger ones fit 1.5mm to 2mm mags.Some of the motors have bad spacing and it makes it hard to just glue in magnets.You'll find a good one in 5 or so.Matt
Jan 07, 2004, 01:18 PM
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I found a really sweet little motor in a defunct CD-RW drive. The stator is only 18 mm in diameter, and is twice the height of other CD-ROM stators I've seen. It only has bushings, but has a nice machined center that will hold bearings after the one-piece bushing is pushed out. Looks like it should be a torquey little motor.

Tony Turley
Jan 07, 2004, 04:47 PM
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galloping gimp's Avatar

You have the basic concept. As Matt pointed out, it's the details that can make the conversion challenging.

My recommendation is to find a surplus CD-ROM drive and take it apart. At that point, make some photos and post them here, and allow the collected knowledge of this forum to advise you further.

I was lucky in that the first and only drive I disassembled was perfect for conversion. I used #26 magnet wire from radio shack and 5x5x1 N45 magnets from Engineering Concepts.

- Jeff
Jan 07, 2004, 05:48 PM
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You know I have been having trouble with the 5x5x1 in some of the really little motors and I ordered some 5x5x.9 to fit in there.
Last motor had 24 magnets as I had to snap them in half to get them to fit (what a pain)
I will find the site and post it.
Is a N45 a 80C Cus the ones I got commin are 120C ?
Jan 07, 2004, 06:20 PM
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galloping gimp's Avatar

I saw your post showing the motor with the 24 half-magnets. Nice job.

The N45 magnets from Engineering Concepts are rated at 80C. George's site also says:
"Also available in N42 SH if operating temperatures will exceed 80 C. Price is the same as the N45."

The site doesn't mention the temperature rating. I'm sure an e-mail to George would produce that info.

- Jeff
Jan 07, 2004, 08:01 PM
Registered User
Well I did some testing and this is what I get
Motor is wound with 22 wraps of 26gauge wire stock grey ring magnet and test was done with a 2s1p E-Tech 1200s

This is a Brushless full bearing Custom Cd-conversion motor:
fully tested and ran at 1/3throttle 1A ,9W, 7.1volts. for 53min, No stutters or hesitations, Clean throttle responce throughout complete range and No detectable heat at all! NONE!
WOT test with a zagi prop 5 1/4 x ?
Total weight: 24 grams
1st Test:

Thrust= 7.3oz WOT
amps=9 WOT
volts=8.4 WOT

2nd Test with 6030 prop

Thrust=10.1oz WOT
amps= 5.5 WOT
volts= 6.7 WOT
This is the prop for this motor!

Still waiting for my new Tach to show up.

Little Screemers!
Last edited by Littlescreamers; Jan 07, 2004 at 09:19 PM.
Jan 07, 2004, 08:03 PM
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Jan 07, 2004, 09:45 PM
Registered User

My mini:

Pic 1 shows the untouched original @ 1.5oz / 40g. The second shows the innards. #3 shows the unnecessary junk stripped away, and a new shaft inserted in the hub. Result so far: .75oz / 22g! Sorry for the poor quality pics - I'm temporarily between "good" digicams, and have to use a cheapie pencam.

Tony Turley

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