Lumenier RB2205C-12 2400KV SKITZO Ceramic Bearing Motor
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Old Jan 11, 2004, 08:28 AM
Littlescreamers is offline
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Hi,
I know you wraped it for tourq but! The prop is way to big, You need a smaller pitch on the prop as not to overload the motor.
It needs a 7x3 or a 6x3.
I got a 24 gramer to put out 10.1 oz thrust with a 7x3 at under 9amps and if I change the mags the amps will go down,
Glad she is not getting to hot now and a good selection of props for testing is a must.
Good luck
Little Screamers
Scott
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Old Jan 11, 2004, 10:57 AM
Scoobyvroom is offline
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Jack of all trades!
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MAn I am starting to get discouraged with RC Groups I posted two new threads not wanting to get off on other threads and no one has replyed to either but even after over 50 people viewed them on both.

Anyway hopefully someone will care in here...


I got this motor out of a Digital Research 2x Burner...
Last edited by Scoobyvroom; Jan 11, 2004 at 11:01 AM.
Old Jan 11, 2004, 11:00 AM
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O.k. I forgot to post the pic, can someone tell me if this would work in a geared setup it is pretty small from the other CD-rom motors I have pulled apart... But this one fits perfect in a 300C gearbox, even the holes line up... you can read most of my dim on the paper next to it...

Chris
Old Jan 11, 2004, 11:39 AM
Ron van Sommeren is offline
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Quote:
Originally posted by CrazEflyer
I have a cd-rom motor that i have converted, and it shuters at half throtle and it all so gets very hot. The cd-rom motor is a sony 56x with a thin gray magnet. I put 16 turns of 22 or 24 guage wire Y wind on it and instaled ball bearings. Do any of you know what i could do diffrent to fix it.
1- Drive your motor with a drill, measure the voltages between the star-point and the motor leads. They should be the same. If not you either have a short(s) or not all coils have the same number of windings.
2-Replace the original ring-magnet with Neodymium magnets. Lower Kv and higher Kt, higher efficiency and easier for the controller to get in sync with the motor.

Met vriendelijke groet Ron van Sommeren
diy outrunner brushless e-motor discussion.
Electric fly-in & lrk meet, June 27th, 2004, Nijmegen, the Netherlands.
Old Jan 11, 2004, 11:44 AM
Ron van Sommeren is offline
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Quote:
Originally posted by rysium
By giving stronger magnets you will have two things:
1 - when you have a stronger magnetic field on the rotor, you can have the same torque with less current on the stator = better efficiency
Not quite. By using stronger magnets you can lower the product of current and #windings to get the same torque (N*A). Lower the number of windings and you get space to use thicker wire, this lowers the coil's resistance and efficiency improves.
Old Jan 11, 2004, 12:10 PM
Rad Racer is offline
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Hi Wattage Electrics - Cool
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Quote:
O.k. I forgot to post the pic, can someone tell me if this would work in a geared setup it is pretty small from the other CD-rom motors I have pulled apart... But this one fits perfect in a 300C gearbox, even the holes line up... you can read most of my dim on the paper next to it...
Yeap, this motor will work in a geared setup. I am using a motor with very similar spec's. You can look at my previous post for details of my motor (post = "CD rom gear drive and ducted fan"). One difficulty maybe the pinion gear, mine needed to be drilled out to a 3mm press fit. If you have a lathe it's easy, otherwise you can try a drillpress and a vise.

The only change I made since I posted the spec's, is to change the magnets to the 5x5x1 N45's.... I highly recommend the change. I have been flying my gear motor in a Slow stick, it works great.

hope this helps,
Wayne
Old Jan 12, 2004, 01:41 AM
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my motor only can get wot with gws 0425, when i change to apc 4.2 X 4 it will miss fire at wot but at middle of throttle it spin fast ! Does any body know what happening?
Old Jan 12, 2004, 09:11 AM
JRW21 is offline
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You will need to retard the timing on your controller.
Old Jan 12, 2004, 10:40 AM
Matthew Cotten is offline
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Your magnets are a little weak sounds like.
Old Jan 12, 2004, 11:12 AM
Ron van Sommeren is offline
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Jason, I have two words for you
www.engconcepts.net
www.supermagnete.ch
Old Jan 12, 2004, 11:25 AM
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Why not Delta?
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Quote:
Originally posted by Matthew Cotten
Your magnets are a little weak sounds like.
That's right.

Let me add a little explanation. The rotating magnetic field from the rotor generates the voltage in the stator that is sensed by ESC (that's how the ESC knows the position of the rotor for the right timing). When magnets are weak the response is so weak, that it gets lost in the electric noise and can't be sensed by ESC any more.

Right answer: Stronger magnets in the rotor.

RysiuM
Old Jan 12, 2004, 12:05 PM
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And it could be that your controller is at it's (2-magnetpole) rpm limit, commutationwise. Remember, for a 9pole/12magnet motor the ESC has to switch 6 times more often than for a 2-magnetpole motor. If your cd-rom motor runs at say 15.000 rpm, it is the equivalent of a 2-magnetpole motor running at 90.000rpm. Stronger magnets lower your rpm (and increase torque).
Last edited by Ron van Sommeren; Jan 12, 2004 at 12:22 PM.
Old Jan 12, 2004, 12:17 PM
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Why not Delta?
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Quote:
Originally posted by Ron van Sommeren
If your cd-rom motor runnig at say 15.000 rpm, is the equivalent of a 2-magnetpole motor running at 90.000rpm. Stronger magnets lower your rpm.
When I was testing the max speed of one of my motors I run it without load to about 60k rpm (it sounded like a turbine ).
The controler is Phoenix 10.

RysiuM
Old Jan 12, 2004, 09:51 PM
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A friend of mine gave me a bunch of cast off motors and drives. Here they are all lined up neatly:
Old Jan 12, 2004, 09:53 PM
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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?


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