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Old Feb 02, 2004, 03:06 PM
"Simplify, then add lightness"
Raleigh,NC
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Lynxman,
AWG26 which is what I am using is about 0.4mm, so you would have to run 4 strands of 0.2mm in parallel to get the same resistance(resistance is inversly proportional to the square of the diameter). The length of the wire depends on how large your stator is and how many turns you are going to use. You could approximate it by measuring the length of one turn, adding some for the thickness of several layers of wire, then multiplying by the number of poles, and the number of turns.

Jeff

PS You can usually get more wire on by using multiple parallel strands of smaller wire, but it is harder to wind.
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Old Feb 02, 2004, 11:19 PM
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Upstate NY
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I went ahead with 14 turns of 24 ga wire, Y connected. After looking closer at Jeff's picture, I see that he has a 120 tooth main gear. So his 11/120 gearing for stock blades isn't all that different from my 8/96.

Here it is after winding:
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Old Feb 02, 2004, 11:21 PM
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Upstate NY
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And ready for the bearings to be installed:
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Old Feb 02, 2004, 11:27 PM
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Upstate NY
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Ready to mount up! Resistance checks on windings show no shorts or breaks. Now I just need to read up on the instructions for the CC Pheonix 10. Will test it with a current limited power supply and extra Rx (before making y cables etc...)

Should I spin it up slowly under no load at first, or will it "run away"?
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Old Feb 02, 2004, 11:47 PM
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United States, WA, Bellingham
Joined Apr 2001
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that is pur-dee! You can throttle up with no load if you want, you don't have to go full throttle but you see if it's going to run. I'm a little worried about your magnet ring, the dark colored ones don't usually fair very well. Best of luck! Let us know how it goes.
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Old Feb 02, 2004, 11:51 PM
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3mm brass tubing motor shaft

I made a shaft for my Piccolo motor today, silver soldered a 2mm shaft in the end for the pinion. Now I can use stock Piccolo pinions.
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Old Feb 03, 2004, 10:12 AM
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Boy, after looking at Omegadot's motor then mine, kinda looks like the Beauty and the Beast! I'm going to try and remove the temporary mount and make a new mount and get it in the Piccolo tonight. BTW, that's FR4 copperclad circutboard material.
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Old Feb 03, 2004, 12:27 PM
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Upstate NY
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Quote:
Originally posted by Art Newland
I'm a little worried about your magnet ring, the dark colored ones don't usually fair very well. Best of luck! Let us know how it goes.
Magnet appears darker in the pic than in real life. It's a hard brownish material with metallic specs dispersed in it. We shall see (tonight!).

On one of these 3 phase things, I gather you measure current draw on the supply side of the speed control? Where/how do you measure the voltage? I could put the speed control at 100% and vary input volts with my bench supply?
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Old Feb 03, 2004, 03:04 PM
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Put your amp/watt meter in between the battery and speed control in series circut, voltage measured across the + and - battery terminals. The good stock magnets are usually medium grey color.
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Old Feb 03, 2004, 10:08 PM
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Upstate NY
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It works!!

Ran the motor unloaded and it ran sweet. I even was lucky enough to get the rotation direction right on the first try : )

Mounted it up to the SkyLark and ran it under load. I still can't believe that little thing has as much "oomph" as it does. Looks like there is a big hole where the old motor used to be.

I couldn't figure out how to measure the motor volts with the speed control in place (stopped short of putting an Oscilloscope on it). I did measure the current draw at a bunch of throttle positions. Looks like the 14 turns - Y was a good choice (Thanks Jeff!). My hovering head speed is reached at 60-65% stick and ~4.5 amps when the power supply was set for 7.5 VDC. . These measurements are pretty rough though. Had ThetaDot holding a flashlight and note pad while I had the tach, heli, and Tx. All with the rest of the lights off. Still have 20 fingers left (between the two of us).

Now I need to make up the Y connections so that I can try it out in flight.
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Old Feb 03, 2004, 10:20 PM
"Simplify, then add lightness"
Raleigh,NC
Joined Nov 2000
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OmegaDot,
That is great. Nice to know it runs as good as it looks. I know what you mean about the tach and the flashlight. I try to do most of my tach readings during the daytime. If I didn't I know there would be scars all over my hands.

Jeff
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Old Feb 03, 2004, 10:36 PM
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That's great news Omegadot! I'd love to see a picture of it mounted in your heli. I finished up my Pocket Combat Wing motor tonight.
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Old Feb 03, 2004, 10:37 PM
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another veiw
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Old Feb 03, 2004, 10:38 PM
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United States, WA, Bellingham
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Best prop seems to be a 3x3 GWS. 20k rpm @ 5 amps on 2S, and 27k rpm @ 8 amps on 3S.
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Old Feb 03, 2004, 10:47 PM
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United States, WA, Bellingham
Joined Apr 2001
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I'm going to abandon my first Piccolo motor and start a new one. I know now, more how I want to do it from info on this thread and others. Thanks to you all for your help. I am going to chronicle the entire build on my Piccolo flys thread. Going to start with this old Hitachi drive motor (same as my first one).
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Last edited by Art Newland; Feb 03, 2004 at 10:49 PM.
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