On Tue, 2006-08-15 at 22:44 +0800, L030010 wrote:
> Hi all
> 
> can anyone please advice me why is it good to use a brushless motor? and if 
> i need a PID control of position is it a good choice?

Efficiency, durability and precise control of speed, compared to normal
DC brushed motors.

What you give up of course is the most basic form of driving circuitry
is much more complicated. This is negated when precise speed control is
needed however.

For controlling position I believe you are thinking of what's called a
"stepper" motor. It is also "brushless", but has many more poles
allowing for relatively precise positioning.

TTYL

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist