Toroidal transformers are available in various versions, adapted to different applications. However, they cause relatively high current peaks during the switch-on process (switch-on currents), since there is no air gap as with transformers with U or E cores. Toroidal transformers cause considerably lower magnetic stray fields, tend to have less disturbing humming noises and absorb considerably lower currents in idle operation. Due to the closed toroidal core, toroidal transformers can only be wound with special machines.Ĭompared to transformers of conventional design, toroidal transformers offer a whole range of advantages: Their power density is larger, so that a more compact and lighter ring transformer is sufficient for the same performance. This Kern consists of either soft-magnetic, ferritic materials, which are brought into the desired shape by a sintering or pressing process, or ring-shaped sheet strips, which are insulated from each other. Unlike transformers of conventional design, where the iron core consists of a U or E-shaped package of sheet metal lamellae, a ring-shaped Kern Transformer is used.
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