Brushless ESC question - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-05-2006, 12:26 PM   #11
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I am: Brad Kacer
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Originally Posted by Canhos

As a side note, when dealing with electrics, If I'm using a motor with wide range of reccommended props, If I want to go with the smallest diameter, do I need to use the lower end of the reccomended voltage range, or the higher. Looking at the Hacker series for reference, if I use the smaller sized props, they seem to reccommend the higher voltage pack, which in turn draws less. Is my understanding of this correct?. It's been a while since my motor theory classes!
Mike: I had that same question, and it seems that the higher you go in voltage, the smaller the prop will be to keep the amps reasonable. Another way to keep the amps reasonable is to go with a higher number of winds on the stator. I've been winding me own motors from CD ROM parts, and have found this to be a valuable tool to some extent, but you have to do a bit of extrapolation/SWAG to get an idea for adding more winds than is shown on the charts.

Many of the brushless ESC's will handle 4S packs, BUT they won't run the BEC this way as they use a linear regulator instead of a switched one. The higher voltage drop in them wouold be converted to heat, and would cook the BEC part of the controller. You will need an UBEC or a regulator of some sort independant of the ESC. I have a bunch of stuff bookmarked, but not yet sorted on this issue. Drop me a PM if you want some reading mat'l on this. I've decided for myself that I'll make a linear regulator (seperate from the ESC - and suprisingly simple if you're nimble with a soldering iron) and waste a few watts of power rather than cough up the dough for an UBEC, but everyone has their own priorities here.

Most of the brushless ESC's today "read" the motor that they are hooked up to, and set themselves up in a default mode to the type of motor they are hooked up to (i.e. inrunner/outrunner), and set up the advance by themselves. The programming that they then let you change (timing advance) is nothing extreme in other words. Just go with the "default" that the ESC gives you to start, and if you'd like, you can play with it after you've worked out the more important things. I guess all you need to do here is insure that the ESC you pick *does* this automajically - check the manufacturers web site.

Best of luck with your project!

Mine is not to reason why; I just wire them up to fry...I mean Fly!
I don't suffer from insanity...I enjoy every minute of it!!!
I never claimed to be the sharpest knife in the chandelier......

Brad Kacer
MAAC # 29287
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