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Old Nov 30, 2006, 08:58 AM
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Direct drive brushless motor for heli

I am an old Vietnamese Engineer and newcomer in model heli .Is it a good Idea to replace the 1/12 gearing system by a multipole lower speed ( around 3000RPM) brushless motor so we can get a better efficiency and trouble free driving system.
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Old Nov 30, 2006, 09:13 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
10,923 Posts
Engineers have a tendency to age very fast, don't ask how I know

About direct drive brushless motors for helicopters:
http://www.rcgroups.com/forums/showthread.php?t=199175
and
www.powercroco.de -> Helidirekt (use e.g. http://babelfish.altavista.com for automatic translation)

Do-it-yourself motor homepages, manuals/tutorials, checks and tests in the first message of this motor builders tips and tricks thread. The checks and tests may save you from frying your controller or motor. Thread is active, bookmark it for future reference and subscribe to it:
http://www.rcgroups.com/forums/showthread.php?t=240993 (sticky thread, at top of subforum)


Vriendelijke groeten Ron
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Old Dec 01, 2006, 11:26 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
10,923 Posts
Quote:
Originally Posted by phanquang_toan
Please may I have another Question about Rare earth magnets o we need to remagnetise them after assembling the motor? ...
No, you don't have to, they come magnetised. And even if you wanted to, you need equipment worth well over $100.000 to magnetise magnets.

Quote:
Originally Posted by phanquang_toan
... Do rare earth magnets sensitive to temperature rise ? ...
YES! Depending on the magnetstrength and quality they die (irreversible!) above 80-120degrees Celsius.

Quote:
Originally Posted by phanquang_toan
... and how to solve it practically ? ...
Good cooling and not-overstressing the motor does the trick.

Quote:
Originally Posted by phanquang_toan
... I and many Vietnamese friends are really happy to do it by ourself ...
Keep us posted here, tell us about your results

Prettig weekend Ron
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Old Dec 01, 2006, 01:29 PM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
10,923 Posts
Quote:
Originally Posted by Ron van Sommeren
... YES! Depending on the magnetstrength and quality/grade they die (irreversible!) above 80-120degrees Celsius ...
See
www.engconcepts.net
-> Explanation of magnet ratings

And
http://www.supermagnete.com
-> frequently asked questions
-> questions about Neodymium magnets

Prettig weekend Ron
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Last edited by Ron van Sommeren; Dec 01, 2006 at 01:34 PM.
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Old Dec 02, 2006, 10:14 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
The Netherlands, GE, Nijmegen
Joined Feb 2001
10,923 Posts
For wire and insulation material go to your local friendly motor/transformer rewinder/refurbisher or repair shop. Excellent quality, all gauges, penny stuff, you'll probably get it for free if you bring your motor along. They love it when they can handle a motor without an overhead crane And maybe let them have a spin with your plane once you finished your motor? You know, in case you need wire again for your next motor

Vriendelijke groeten Ron
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