In the second step current to coil A is turned off and current to coil B is turned on in opposite sense to that in {HEAD ~ the induction phase} to change {TAIL ~ the polarity} at the pole ends 34 and 38 
to change
In the second step current to coil A is turned off and current to coil B is turned on in opposite sense to that in { HEAD ~ the induction phase } to change { TAIL ~ the polarity } at the pole ends 34 and 38
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH