As shown in FIG 3, the iron core 11 is formed of particles 14 of iron or an iron based magnetic material filled in a casing 13 which is made of {HEAD ~ an insulating synthetic resin} such as {TAIL ~ phenol} and nylon 
As shown in FIG 3 , the iron core 11 is formed of particles 14 of iron or an iron based magnetic material filled in a casing 13 which is made of { HEAD ~ an insulating synthetic resin } such as { TAIL ~ phenol } and nylon
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 OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH