On 19 April 2012 04:51, Sean Breheny wrote: > > Hi Denny, > > The manufacturer should provide a commutation table - sadly, they > often do not provide them, but it is definitely worth asking for one. > If they don't know the commutation table, ask them for a particular > drive that is compatible with this motor and then look at the > datasheet for that drive. Visualisation can be good. A light (LED probably) that turns on when a sensor was active and that was used to "strobe" the spinning motor would allow comparison of 3 sensors in action and forward/ backward comparisons. An oscilloscope display does only part of this. Could be illuminating :-) Russell McMahon --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .