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
"endrophie" wrote
I take it the OP is referring to the type of motor refereed to as a "CD player motor".
There are integrated circuits just for powering these motors.
Look in the model aircraft groups and web sites.
Search w/ Google.
-- Nicholas O. Lindan, Cleveland, Ohio Consulting Engineer: Electronics; Informatics; Photonics. Remove spaces etc. to reply: n o lindan at net com dot com psst.. want to buy an f-stop timer? nolindan.com/da/fstop/
Hello,
I´m searching for an algorithm for an microcontroller with digital an analog inputs for BEMF-analyzing.
Best regards
Endrophie
If you don't have hall sensors or a shaft encoder and are using BEMF sensing to do the commutation, at very low RPM's the BEMF signal will be weak so you will have to give the motor a kickstart I think. The way I would try this is to put the motor into a known state first (ie one of the 6 commutation states for a 3phase brushless DC motor), and then quickly start doing commutation from that state in the desired direction, assuming that the motor is able to turn and is not loaded too high this should work until you get enough BMF for the sensorless operation to work I think. I have a 3phase brushless DC motor controller that I made that is waiting for me to test this out on too ;)
cheers, Jamie
This has some good info on that:
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
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