I am building a power supply for a Plasma cutter. Since the design results in high DC voltage on both the torch and work clamp I want to provide an isolation transformer so I can ground the work clamp for operator safety.
I am starting with a 3-coil 3-phase transformer and rewiring it to 3 single phase coils to feed 3 bridge rectifiers. The coils are mounted on an iron core shaped like 2 "E"s joined together with a coil on each leg of the "E". One "E" faces up and the other "E" faces down forming a solid rectangle with two rectangular holes in it.
Should the center coil have the same magnetic polarity as the two end coils or should it be reversed? In other words should the center coil have the North pole up at the same time as the two end coils or South when the two end poles are North?
(^)(^)(^) or (^)(v)(^) ? (^)=North up (v)=North down
I am starting with a 3-coil 3-phase transformer and rewiring it to 3 single phase coils to feed 3 bridge rectifiers. The coils are mounted on an iron core shaped like 2 "E"s joined together with a coil on each leg of the "E". One "E" faces up and the other "E" faces down forming a solid rectangle with two rectangular holes in it.
Should the center coil have the same magnetic polarity as the two end coils or should it be reversed? In other words should the center coil have the North pole up at the same time as the two end coils or South when the two end poles are North?
(^)(^)(^) or (^)(v)(^) ? (^)=North up (v)=North down