Toroidal inductors and transformers

Toroidal inductors and transformers are a kind of electronic component. They typically consist of a circular, ring-shaped magnetic centre. The magnet is usually considered a monopole, although the central axis will have a dipole, and have the advantage of being wound continuously in a single direction, thus there is no inductive interference between windings as in a solenoid that is wound back and forth.

Several small toroidal inductors. The major scale is in inches.

A small toroidal transformer.

References

• Griffiths, David (1989), Introduction to Electrodynamics, Prentice-Hall, ISBN 0-13-481367-7
• Halliday; Resnick (1962), Physics, part two, John Wiley & Sons
• Hayt, William (1989), Engineering Electromagnetics (5th ed.), McGraw-Hill, ISBN 0-07-027406-1
• Purcell, Edward M. (1965), Electricity and Magnetism, Berkeley Physics Course, vol. II, McGraw-Hill, ISBN 978-0-07-004859-1
• Reitz, John R.; Milford, Frederick J.; Christy, Robert W. (1993), Foundations of Electromagnetic Theory, Addison-Wesley, ISBN 0-201-52624-7

Other websites

• Approximate inductance of a toroid includes formula, but assumes circular windings