searching startup procedure for brushless outrunner motor

[endrophie]

hello,

doeß anybody know a special procedure, that an brushless outrunner has
a fast an reliable startup?
Against to engines with inlaying magnets, an outrunner has more torque
and a load with a higher inertia mass. Therefor, the start is more
difficult.
Who knows a strategy or has an idea?

best regards

Endrophie

 

[Jamie Morken]

Hi,

endrophie@aol.com wrote:

There are integrated circuits just for powering these motors.


Hello,

I´m searching for an algorithm for an microcontroller with digital an
analog inputs for BEMF-analyzing.

This has some good info on that:
http://focus.ti.com/lit/an/spra498/spra498.pdf

They use resistor dividers and RC lowpass filters from the 3 motor
windings and then samples them with the ADC on the microcontroller.

cheers,
Jamie

Best regards

Endrophie