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HomeRC & Power✈️Aircraft🚁Helicoptere-Electric Motors-Controllers-ESCOther › Brushless basic questions
01-12-2006 09:28 AM  13 years ago
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Riverman

rrApprentice

Peace River, Alberta

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Brushless basic questions
Hello

I'm fairly new with brushless motors and I currently have two helicopters running brushless motors. Each with their own issues.
My smaller heli, a modified Blade CP, is running a 36KV BL-36 motor. It generates wicked amounts of power even at low throttle and I can't seem to get a handle on it.Fifty percent throttle results in reasonable head speeds but the motor gets extremely hot and seems to be drawing a lot of current. I guess my questions are do brushless motors need to be run at high power to be efficient and how detrimental is heat to the motor? Would I use more current at 50% than I would at 100% throttle?
My other question is regarding the three wire input into brushless motors. Can someone explain the scheme? Between the two ESCs and two motors I own, I think I have seen 4 different color schemes.(ie not black to black, red to red, etc) I had read the worst you could due when wiring a brushless motor incorrectly is have it turn in the wrong direction. However, yesterday when wiring up a brushless motor in my larger heli, I managed to let some of the smoke out of the motor. I Figured out the proper wiring and was only able to run the motor another 10 minutes before it came to a dramatic smokey death.
In those last 10 minutes it ran hot enough to cook an egg on but with plenty of power. What gives? Thanks for the help.


Regards, Brett
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01-12-2006 09:39 AM  13 years ago
chuckhager

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Clovis, CA

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I try not to run my ESC's below 80%. The lower you set this the more heat it will produce. What pinion are you running on your Blade CP?

You are correct on the wiring. You can connect any of the three wires from the ESC to the BL motor. If it spins in the wrong direction, you can reverse any two wires.
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01-12-2006 09:45 AM  13 years ago
Lorents

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Oslo, Norway

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Yeah, I think you have to use a smaller pinion on your CP. It is working too hard now, and as Chuck says it would probably be best if you could fly it at 80% throtle or more

What comes around goes around.
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01-12-2006 07:15 PM  13 years ago
Riverman

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Peace River, Alberta

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Thanks guys

As far as the pinion I'm running on the Blade, its a 9 tooth. I'm waiting for my 8 tooth to arrive. I'm wondering if it's going to be enough of a drop to make this managable.
So you think it just coincidence that I fried a BL motor as I was wiring it up? It's made me a little paranoid. Sure hope it's not the ESC. It's brand new.

Brett
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01-12-2006 07:46 PM  13 years ago
chuckhager

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Clovis, CA

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It could be the ESC. I burnt up two motors. Then changed out the ESC. No problems now.
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05-14-2006 08:26 AM  13 years ago
electromagnetic

rrNovice

san dimas cal

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the motor/esc colored leads are there for phasing a-b-c / identification purposes
the 3 leads comming from the esc have different colors for rotation puposes switch any two leads and it will change the rotation it will go in the other direction,you can switch the esc/motor leads but all three leads from the esc must terminate into the motor you only need to switch one set of the two = motor/esc to change rotation,wonder why your motor smoked? the different colors of different esc/motors manufactors are only to seperate the individual leads from each other for rotation purposes so far there is no meaning as far as voltage or current to color of wire that i know of for rc motors they are small induction motors they create a rortating magnetic field that interacts with the magnets around the housing or stator causing torque/rotating iam a an industrial electrician i also programm industrial plc/temp controls and solid state devices and i had alot to learn about helis pitch/throttle curves setups now it is fun to fly
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05-21-2006 01:50 PM  13 years ago
Pistol Pete

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Seffner, FL

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Brushless are meant to be operated at high speed to reach its maximum efficiency of 80% avg.

http://www.aveox.com/rc/faq.html
~~Enjoying the hobby one flight at a time~~
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05-27-2006 04:27 PM  13 years ago
Pistol Pete

rrProfessor

Seffner, FL

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http://www.runryder.com/t261075p1/~~Enjoying the hobby one flight at a time~~
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