Toroidal Transformers

Introduction:
Toroidal power transformers use a circular tape wound core (doughnut shaped) of grain oriented silicon steel or nickel. Toroidal cores have no air gap, which allows the transformer to have extremely low radiated stray magnetic field. Though more expensive than conventional laminated EI transformers, toroids can be made smaller and lighter with higher efficiency.

Typical Applications:
With the magnetic field well contained within the core, toroids are ideal for use in applications such as CRT displays, medical equipment, and high-end amplifiers.

Low profile toroidal transformers are used in slim line cabinets in audio/video equipment, as well as in rack systems for the telecommunications and computer industries.

Toroids are also used in power supplies, as isolation and autoformers, and as inductors.

Electrical Characteristics:
Toroidal transformers are exceptionally efficient and radiate very little stray magnetic field.

Custom Magnetics typically produces toroidal transformers from 1 Watt up to 1,500 Watts at frequencies of 25 Hz to 400 Hz.

Physical Characteristics:
The thickness of the tape used to make toroids varies from 2 mil to 12 mil, and the width varies from 1/8" to 2". Thus, toroids offer a great flexibility in the height and diameter of the finished product. Custom Magnetics is capable of producing Toroids up to 8" in diameter and 4" in height.

Mounting is made easy using a single center bolt with a metal disk and rubber gasket. Center potted with thru hole construction, as well as fully encapsulated units are also available.

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