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Old Nov 17, 2004, 11:26 PM
zagisrule! is offline
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Edgewood, NM
Joined Jan 2002
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While I am thinking about it...

1. Why bother with switching the rail anyway? Just wire the center tap of the motor to Vcc (the wye connection to the + rail) and switch only the ground to each of the motor leads to accomplish commutation. This means you can get rid of all the P-channels and their inverting transistor drivers.

2. Can you explain the thought behind your digital logic switching? I am thinking that it is not going to work. I have started writing sensorless control code (a failure as of yet...can't get rotor lock) for 3-phase motors and frankly I just do not see the logic solution working unless I am missing something on what exactly it is doing. From the looks of it you are just selectively energizing the coils based on the hall inputs.

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