Notes:
(1) Because N1I1 ¼ N2I2 and since I2 produces a flux which opposes that due to I1, the net flux in the core is zero. In reality,
there will be a small flux due to losses.
(2) Because this is an ideal transformer, the dimensions of the core and frequency of the source are not important: They do
not figure in the calculation. In practical transformers, the dimensions define the maximum flux density allowable
without the core reaching saturation.
Toroidal transformers are favored for audio applications because they are inherently low-leakage transformers, even at
low core permeability. Typically, they offer the shortest magnetic path and, therefore, the lowest reluctance in addition to
being economical in both winding and core materials. However, since the winding of coils is usually done after the core is
assembled (made of stacked-up laminations or of strips of the lamination material wound in the form of a torus), it is
complicated and requires special winding equipment. Toroidal transformers are also very useful in switching and highfrequency
applications.
Notes:(1) Because N1I1 ¼ N2I2 and since I2 produces a flux which opposes that due to I1, the net flux in the core is zero. In reality,there will be a small flux due to losses.(2) Because this is an ideal transformer, the dimensions of the core and frequency of the source are not important: They donot figure in the calculation. In practical transformers, the dimensions define the maximum flux density allowablewithout the core reaching saturation.Toroidal transformers are favored for audio applications because they are inherently low-leakage transformers, even atlow core permeability. Typically, they offer the shortest magnetic path and, therefore, the lowest reluctance in addition tobeing economical in both winding and core materials. However, since the winding of coils is usually done after the core isassembled (made of stacked-up laminations or of strips of the lamination material wound in the form of a torus), it iscomplicated and requires special winding equipment. Toroidal transformers are also very useful in switching and highfrequencyapplications.
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