methods wrote:I was under the impression that the standard method is trial and error. I am an EE but I could not tell you how to do it with a scope
There are several spradsheets around here to use... Keeping track is critical as it is easy to get turned around if you dont write down what has been tried.
There are also quite a few tips - little tricks that can get you to the correct configuration in only 2 steps if you can ... say.. get it to run smooth backwards.
Given that there are 36 possible permutations - 1 guaranteed to work, several likely to work - I usually get it within 6 tries.
I dont use current limiting but I do use a current monitor and a soft touch on the throttle.
I guess that is not saying much though since I dont use current limiting ever -> I figure the worst I can do is V/R
You surprise me. 6 of the 36 possibilities work, though 3 work in the wrong direction and 3 work in the correct direction. You can actually limit it to a maximum of 11 tries, by connecting 3 phases and trying all 6 hall combos. If that doesn't get it, then it will get a good reverse. On the good reverse, just swap 2 phase wires and try the other 5 hall combos again (the other 5 because you know the good one on the reverse can't also work in forward). Using this method you could lock the halls and change the phases in the same manner, but I find moving phases around more risky, so I stick with swapping the halls and try at most 2 combos of phase wires. The only confusing part is the false positives, ie spins right direction, sometimes very fast, but more noisy at start. Watching the current gives those false positives away right away.