page_title: Toroidal inductors and transformers
section_title: Toroidal transformer Poynting vector coupling from primary to secondary in the presence of total B field confinement
hierarchical_section_title: Toroidal inductors and transformers / Total B field confinement by toroidal inductors / Toroidal transformer Poynting vector coupling from primary to secondary in the presence of total B field confinement
caption_attribution_description: English: Shows the development of the Poynting vector in a toroidal transformer where the B flux created by the primary current id completely segregated form the secondary winding.
context_page_description: Toroidal inductors and transformers are inductors and transformers which use magnetic cores with a toroidal shape. They are passive electronic components, consisting of a circular ring or donut shaped magnetic core of ferromagnetic material such as laminated iron, iron powder, or ferrite, around which wire is wound.
  Although in the past, closed-core inductors and transformers often used cores with a square shape, the use of toroidal-shaped cores has increased greatly because of their superior electrical performance. The advantage of the toroidal shape is that, due to its symmetry, the amount of magnetic flux that escapes outside the core is low, therefore it is more efficient and thus radiates less electromagnetic interference.
  Toroidal inductors and transformers are used in a wide range of electronic circuits: power supplies, inverters, and amplifiers, which in turn are used in the vast majority of electrical equipment: TVs, radios, computers, and audio systems.
caption: In this figure, blue dots indicate where B flux from the primary current comes out of the picture and plus signs indicate where it goes into the picture.
exif: {}