In a transformer, why are both coils apart from each other? Wouldn’t make more sense to have the ferrite core (tube shape), wind the primary coil around that and then wind the secondary coil on top of the primary? So that the magnetic fields are as close to each other as possible?
- Insulation. Physically separating the two sides makes sure there are no issues.
- The difference in magnetic fields distance is fairly irrelevant with a core that is really good at “conducting” magnetic fields.