BLDC - how it work?

[Alladin]

Hi!

I try to construct some BLDC contoller - i'm a electronic and C programmer
for Atmel microcontrolers - my desin it will be based on Atmel Atmega8 processor. I have a problem with understand nad find information about
signals from coils of motor.
How do these signals look like for?
It is one signal at one time or a combination of this tree outputs?

[Jim Buzzeo]

Have a Look here http://www.rcgroups.com/forums/showthread.php?t=200567
and Here
http://www.rcgroups.com/forums/showthread.php?t=140454
the cartoon version:
it's typically ON (at least partially) for two of the three sets of coils,
the voltage produced by the "off" coil set is used to feedback RPM info to the controller.
those two threads are a wealth of information.

[Ron van Sommeren]

Brushless ESC explained:
http://www.torcman.de/peterslrk/SPEEDY-BL_eng.html#Anker1591256

Met vriendelijke groet ;) Ron van Sommeren