Toroidal Transformer - Ferrite Core Transformers

As today's electronic designers pack more components into less space, there is increasing demand for high performance components. Toroidal transformers with a ferrite core are in the high performance category. A 360 degree wound ferrite core toroid (and toroids in general) has a high degree of symmetry. Its geometry leads to near complete magnetic field cancellation outside of its coil, hence the toroidal transformer has less leakage inductance and less EMI when compared against other coils of equal power rating.

Today's electronic devices are being operated at ever increasing high frequency. Ferrite core toroidal transformer manufacturers have developed core materials that can operate above 1 megahertz at low gauss levels. Use of a ferrite core toroidal transformer combines the performance features of the toroidal shape and the low loss feature of the ferrite core material. . In high frequency applications a ferrite core toroidal transformer can offer smaller size (by volume & weight) and lower losses. Core materials have been developed for power applications and filtering applications. Some have a temperature coefficient designed to offset capacitor temperature drift for tuned filter applications. Core material initial relative permeability can range from 750 to 15000. Materials for the highest frequencies usually have lower permeability.

Toroidal transformers with ferrite cores are commercially available in a variety of sizes ranging from one tenth to five and one half inches outside diameter. The weight ranges from a fraction of an ounce to 1.763 pounds. Larger ones exist but they are specialty items. Some larger specialty They can be purchased with or without an insulating coating. Several voltage ratings are available.

Butler Winding makes toroidal transformers and ferrite core toroid coils in a wide variety of materials and sizes. Butler Winding also does "bobbin wound" and "tube wound". Butler winding has a variety of winding machines, bobbin/tube and toroid. That includes two programmable automated machines and a taping machine for toroids. Butler Winding has vacuum chamber(s) for vacuum impregnation and can also encapsulate. To ensure quality, Butler Winding purchased two programmable automated testing machines. Most of our production is 100% tested on these machines. For more information on Butler Winding's capabilities, click on our "capabilities" link.

Need More Technical Information about Electronic Transformers in general?

More information is available on other web pages included in this web site. Saturation and the volt-second product are discussed in the "pulse transformer" web page. An equivalent circuit for a transformer is included in the "power transformers" web page. The "inverter transformer" and "push pull" web pages include some discussion about magnetic "bipolar" and "unipolar" operating modes. There are web pages for various types (applications) of transformers (and inductors). Click on one of the available links.

Also, feel free to contact Butler Winding and ask for technical or engineering assistance.