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 phenol and {TAIL ~ nylon} 
such as
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 phenol and { TAIL ~ 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 OTH OTH TAIL TAIL TAIL TAIL TAIL