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Advantage and Efficiency of Toroidal Transformer A toroidal transformer is a doughnut-shaped object whose surface remains torus. Its actual shape is created by revolving a circle around an axis exterior to the circle. A coil of insulated wire in this doughnut shape which is usually with a core of iron or same as metal is an example of toroidal object. They are actually used as inductors in circuits for low frequency transformer and receivers as they have superior inductance and also carry higher current than any other similar constructed solenoids. They are as well used as normal transformer in power supplies. Toroidal coils cut down resistance, due to the larger diameter and lower number of windings. The magnetic flux in toroidal transformer is limited to the core, preventing its energy from being absorbed by any close by objects. Advantages A toroidal transformer carries many advantages over average laminated power transformers . Toroidals transformer offers quiet, competent operation with extremely low stray magnetic fields. Their small size and the weight system support a package, which is trouble-free to design into any application. Toroidal transformer is a highly resourceful donut shaped core. To construct the core, grain-sloping silicon-iron is split to create a ribbon of steel that is then wound, like an extremely tight clock spring. The final result is a core in that all of the molecules are shaped with the direction of flux. Molecules not shaped with the magnetic flux direction boost up a core's unwillingness (the capacity for contrasting magnetic induction), debasing performance to the level of usual steel when the molecules are 90 degrees out of phase. Efficiency Since toroidal transformer cores are made up of a constantly wound ribbon, there is almost no air gap. The windings are lightly wrapped over the full core permitting the toroidal transformer to work at a superior flux density than in typical transformers. Toroidal transformers could work at 1.6 to 1.8 Tesla (16,000 to 18,000 Gauss) as EI cores are restricted to 1.2 to 1.4 Tesla (12,000 to 14,000 Gauss). The magnetic flux of the windings is sloping in similar direction as the grain-oriented core, hence achieving extremely high electrical efficiencies. Efficiency is calculated of a toroidal transformer's capability to convey the input power to the load. Efficiency is uttered as a percent by: % = (PO / PI) x 100 Where; PO = Output power, PI = Input power, % = Efficiency Also, reserve losses are very much reduced under no-load operation due to the lower magnetizing currents essential by the toroidal core.

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8/18/2008