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Midland Helicopters . HeliProz . ZoomsHobbies

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e-Lite Machines Corona > New Corona Question
 
 
rbrown3rd
Heliman
Location: West Palm Beach, Florida

My Corona is gradually becoming complete. Today I received my Astro 020 and Phoenix 35 from Cliff at Atlantahobbies. I am totally new to this so forgive me if this is a dumb question. When I rotate the shaft on the motor it does not spin smoothly. Is that normal for a brushless motor?

Also, where is the best place to mount the ESC?

Thanks for helping this newbie working towards attaining flight.

Bob
03-25-2004 Over year old.
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N111KX
Heliman
Location: Atlanta, GA USA

Motors and such

Bob, brushless motors have magnetic resistance just like brushed. My Mega has a lot of resistance, the Astro is in the middle, and I have spun a Hacker with vitually none. It's just a design difference. It does seem that the lesser the resistance, the smoother the startup. I pre-rotate my main rotors by hand because the "grab" sends a decent sized shock through the tranny of my Corona. A friend of mine has a Astro (from Cliff also) and gets smooth start-ups...
Kip
03-30-2004 Over year old.
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rbrown3rd
Heliman
Location: West Palm Beach, Florida

Thanks Kip. I did a test with the Corona weighted down and it spun up smoothly. A bit of clackety noise on first movement but then it sounded nice and smooth. I could do no more than a short test because my charger has not arrived yet.
03-30-2004 Over year old.
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TMorita
Senior Heliman
Location: SF Bay Area, CA

The effect you noticed is called "cogging" ...

It depends on the motor construction. If the motor has an iron core for the windings, then the magnets on the shaft are attracted to it, so it's difficult to turn the motor shaft by hand because you need to pull the magnets away from the metal. (Astroflight, Mega, Aveox, Plettenberg Model Motors, etc motors)

If the motor has no iron core for the windings, then the magnets on the shaft aren't attracted to anything, so it turns smoothly when rotated by hand. (Hacker, etc motors)

Toshi
04-01-2004 Over year old.
 
 
rbrown3rd
Heliman
Location: West Palm Beach, Florida

Thank you Toshi for this explanation. If the Hacker's do not have this cogging effect then what are their windings made of that does not cause this magnetic pulling and how did you gain such in-depth extensive knowledge of all of this stuff?

I know I have thanked you before but your beginners guide has been invaluable to me. As a newbie I read it often and always seem to find a new bit of information in it that I have never seen before. Your perspective and your willingness to share it is a treasure.

Bob
04-01-2004 Over year old.
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HeliHobby . Ron’s HeliProz South . Century Helicopter

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e-Lite Machines Corona > New Corona Question
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