read the .pdf. it explains all this for the powermax motors. It has charts that show the A's and B's. It's at the end of the 23 size motors. Wait, heres the link:
http://www.xylotex.com/PacSciDS.pdf
Page 54
Page 50 - the picture on this page for bipolar series is labeled wrong for the A and B. The A's and B's are in the same positions in the picture as the parallel wiring picture to the right.
Hope this helps,
Gerry