> Very interesting! I was going to say it was a great deal, but
> I'm not sure what 219 Euros is, anymore. One thing I note, is
> it does not use the HAll signals for commutation. The problem
> there is it has no idea how to operate the motor until it has
> seen the index pulse. I guess maybe it tries random application
> of voltage until the motor moves in the desired direction until
> it sees the index pulse, then it knows from then on. I might
> ask them for additional info on that.
>
> Jon
You can apply power (helps to have a current feedback amp or know what PWM
gives what current at stall) to one phase at startup to establish initial
encoder/magnetic alignment. It is still nice to have hall effect inputs so you
can choose the proper phase to start with to minimize uncontrolled motion at
powerup.
Most ideal would be something like one of the the Austria Microsystems Hall
effect absolute encoders. Then you would alway know the rotor position at
startup within .2 degree or so. Too bad they are not quite good enough to
replace optical encoders (Yet).
Peter Wallace
Mesa Electronics
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