wherein the cylinder magnetization unit includes {TAIL ~ a single exciting coil} which is wound about {HEAD ~ the connecting portion}; and 
wherein the cylinder magnetization unit includes { TAIL ~ a single exciting coil } which is wound about { HEAD ~ the connecting portion } ; and
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH