TOROIDAL TRANSFORMER
Toroidal transformer
Toroidal transformer
Doughnut shaped toroidal transformers
save space compared to E-I cores, and sometimes to reduce external magnetic
field. These use a ring shaped core, copper winding wrapped round this ring
(and thus threaded through the ring during winding), and tape for insulation.
Toroidal transformers have a lower external magnetic field
compared to rectangular transformers, and can be smaller for a given power
rating. However, they cost more to make, as winding requires more complex and
slower equipment.
They can be mounted by a bolt through the center, using washers
and rubber pads or by potting in resin.