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Apr 14, 2012, 05:09 PM
Cumulus Altimus
FASTBEN's Avatar
I see....for me is the matter of faster climb out,the rest the plane is just souring
Ben
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Apr 14, 2012, 05:26 PM
Earthbound Skyhound
StarHopper44's Avatar
Gotta love that EagleTree system! Mine's telling me things I would've never dreamed. Of course, some of what it reveals is rather baffling too! *LOL* I get about as much fun out've reading & analyzing flight data as I do out of flying the planes! Seems almost 'wrong', in a way -- color me nerd.
Apr 14, 2012, 07:21 PM
Jack
jackerbes's Avatar
Well, then I am a nerd too then! Agonizing over the numbers and details is a happy time for me too!

Jack
Apr 17, 2012, 02:13 PM
Registered User

No email for activation


Registered for use of this site under the login of "davearl313", have yet to receive an email for activation. Can anyone help!
Apr 17, 2012, 07:18 PM
Registered User
rgoble's Avatar
Quote:
Originally Posted by davearl313
Registered for use of this site under the login of "davearl313", have yet to receive an email for activation. Can anyone help!
PM Sent.
Apr 18, 2012, 12:21 PM
Earthbound Skyhound
StarHopper44's Avatar
oops....nevermind...
Last edited by StarHopper44; Apr 18, 2012 at 01:07 PM.
Apr 28, 2012, 08:22 AM
Earthbound Skyhound
StarHopper44's Avatar
I read something today from an instruction sheet that seems to contradict something I was told earlier, re # of poles in a BL motor.
The instructions say, "Usually the pair number of magnets on rotor is poles. If you count 14pcs magnet on the rotor shell, then you should select 7 P(Poles)", which presumably translates simply to, "Number of magnets is twice the number of poles".

True or not?
Apr 28, 2012, 10:06 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Not correct, but then again, it is not what they meant. This is what it should say:
"You should select 7 Pairs"

Motormagnetpoles always come in two's, statorpoles (the teeth) always come in three's.
See these motor animations and simulations, very instructive:
https://www.rcgroups.com/forums/show...ght=anim+simul

Controller max.rpm. limit depends on computer processing power on board. The limit is specced for 2-magnetpole motors. Say a controller can handle 140krpm . It can do that for a 2-magnetpole/1-pole-pair motor. It can handle 70krpm for a 4-magnetpole/2polepair motor ... and it can handle 20krpm for a 14-magnetpole/7polepair motor. To the controller, there's no difference between those motors, controller does not care about number of magnetpoles. But people do care about rpm. to calculate the correct rpm, the user must enter a number.
So, to 'know' the actual shaft rpm the motor is running at, the ESC must divide the electrical rpm by seven, that's the number that particular manufacturer wants you to enter.


Quote:
Originally Posted by wazoo22
... I read an article somewhere about ESC programming vs. number of poles, but can't remember where.
Max. rpm table, per make/type/#magnetpoles
http://www.bavaria-direct.co.za/models/motor_info.htm (RCG user skylar)
-> ESC Max. RPM Limits


Vriendelijke groeten Ron
diy motor tipsDrive Calculator
diy motor groupCumulus MFC
• Get a life ... get a Watt-meter!!! •
Last edited by Ron van Sommeren; Apr 28, 2012 at 12:40 PM.
May 02, 2012, 10:53 AM
Earthbound Skyhound
StarHopper44's Avatar
Thanks Ron....but many (most?) of the links on that reference page are not working. I see the thread is a bit long of tooth now (old)....perhaps an update would be worth the while if you refer to it regularly, if the resources are still available?
May 02, 2012, 11:12 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
Animations

Outrunners are inrunners turned inside out, that's all
http://townbiz.com/animations/2-pole_bldc.html (star connection is missing)
http://townbiz.com/animations/4-pole_bldc.html (star hook-up in green)





Simulations



May 02, 2012, 11:41 AM
just Some Useless Geek
It'd be nice to know where these simulations come from to give credit to the sources, eh? Also, to know if the images can be copied and used in other venues.
May 02, 2012, 03:01 PM
Balsa builder and balsa basher
RC Trainer plane's Avatar
check this out https://www.rcgroups.com/forums/show....php?t=1638287
May 02, 2012, 07:47 PM
just Some Useless Geek
Um...there are no links to simulations in that thread. Why do you want us to go there?
May 02, 2012, 08:26 PM
Jack
jackerbes's Avatar
To acquaint us with a radical new building technique, he is making airplanes out of some kind of wood! No foam at all as near as I can tell...

Jack
May 03, 2012, 04:44 AM
just Some Useless Geek
Yeah, this guy was so proud of his effort he posted all over the place begging people to come look at his build thread. Ahh, to be newbie and have absolutely no sense of shame...


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