Toroidal
Power Transformers Market is segmented into application, product and
geographical regions. A toroidal transformer has ring type core made from cold
rolled grain oriented (CRGO) Silicon steel strip devoid of any joints and
annealed for stress relief after being wound. These wound cores are then
suitably insulated by class B insulation and the winding of copper wire is
usually done by winding machines. In Toroidal Power Transformers the core is
permanent, devoid of any air gap and the path of flux being along the direction
of grain orientation, gives an occasion for optimum use of flux density, in
addition very low iron loss and exciting current. The primary and secondary
windings are closely linked magnetically. Therefore, the leakage fluxes and
reactance are negligible.
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A toroidal transformer has its
winding spread over the entire periphery of the core. This results in larger
area for dissipating the heat. Till date, all such small low voltage type
transformers needs were met approximately universally by traditional or
conventional El transformers.Now materials are easily available, so it has been
possible to develop low voltage transformers giving a whole set of advantages
and wide range of applications in place of conventional transformers.
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 windings wrapped round
this ring (and thus threaded through the ring during winding), and tape for
insulation. Toroidal transformers have a lower external magnetic field as
compared to rectangular transformers, and can be smaller for a given power
rating. Though 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.
The toroidal transformer
construction, although generally more expensive than E-I laminated core types,
provides a smaller and lighter transformer than for a given power rating
together with higher efficiency and less leakage of magnetic field around the
transformer.
Toroidal Power Transformer
Market is segmented by Application into Medical equipment, Audio/Video
products, Motor control equipment, Lighting, stabilized power supplies,
Microprocessor based units, Battery chargers, Telecommunication products,
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