friedwires said:
that stupid spreadsheet works great for me every time
I'm just not into wasting my time. It's a simple logic problem with a simple solution that with bullets on the phase connections and the hall spades out of their connector I could find the right wiring combo blindfolded. As Dogman pointed out, good connections are a must.
If the correct firing sequence is A-B-C, since the magnets run in a continuous circle, A-B-C is the same as B-C-A and C-A-B, because they all repeat to A-B-C-A-B-C-A-B-C-A-B-C . It doesn't matter if the starting position is A or B or C, the continuous result is the same.
That covers 3 of the possible combos of the phase wires. Now for the other direction, just swap any 2 and only 2 and you get C-B-A-C-B-A-C-B-A-C-B-A- as the continuous sequence for reverse (ie ABC backward). That's why with a sensorless motor you just swap 2 phase wires to change direction of spin. The same is true for our sensored motors, but we just need to find the right combo of halls to go with it, and there are only 6 possibilities.
A lot of the motors will spin the wheel on a bad combo, what I call a false positive. With a bit of experience you'll know the sound of a false positive, and they actually can be a short cut to finding the right combo. That's because they spin the wrong direction, so if you run into a false positive you know to swap 2, any 2, and only 2 phase wires and the answer has to be in the remaining 5 hall combos.
Teach people to understand the problem and how to solve it. Crutches like the spreadsheet can be valuable tools, but only if they are true savers of time and effort. This one is just the opposite.