Toroidal Coils

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An inductor stores electrical energy through the production of a magnetic field and introduces that stored energy flow into the metallic core. The most common material used to form conductive metal wire is copper, while the metallic core is typically manufactured using materials such as solid iron, solid steel or powdered iron due to their ferromagnetic capabilities.

Toroidal Coils Toroidal coils are electrical components that consist of a doughnut-shaped metallic core that has a conducting metal wire looped or coiled around it in order to form an inductor.

Leading Manufacturers

Sag Harbor, NY  |  631-725-0440

We are proud of the craftsmanship of our engineers. All of our products are made right here in the United States and we promise that these items are created from high quality resources. Our electrical coils are unique and efficient. We are dedicated to manufacturing the best coils around. Our teams utilize sophisticated to procedures to develop these top notch electrical coils. Give us a call today to learn more information!

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Sag Harbor Industries, Inc. $$$

Antigo, WI  |  800-826-9741

Johnson Electric Coil Company is a family owned manufacturer that specializes in custom transformers, coils and inductors. From three phase isolation transformers to single phase inductors and chokes, we carefully design our products to meet your exact specifications. Our experienced engineers are available to assist during every step of the process. Let Johnson make great parts for you!

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Johnson Electric Coil Company $$$

Tacoma, WA  |  253-324-3044

PolyTech Coil Winding consistently meets the prototype and production needs of companies developing products for inertial navigation equipment, earthquake detection seismometers, virtual reality headsets, MRI coils, bioengineering implants, transformers, musical instruments and the list goes on. We custom design and fabricate any electric coils for domestic and international companies.

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PolyTech Coil Winding $$$

Arcade, NY  |  716-532-2234

Communication Coil, Inc. has been designing and producing high reliability Filter Networks, RF Coils, Chokes, Inductors, Baluns, Toroids, Toroidal Transformers and Power Magnetics since 1944 to high-exacting standards for communications and signal processing in military, industrial, avionics, satellite, telemetry, marine, GPS and commercial applications.

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Communication Coil, Inc. $$$

South Haven, MI  |  269-637-5201

South Haven Coil has been manufacturing superior quality electromagnetic products since 1957,all made 100% in the USA. We are one of the nation's leading quality electromagnet manufacturer's.Specializing in electromagnets, wire harnesses & termination, molded coil assemblies,potted coils, bobbin-wound coils, toroids,laminated & ferrite transformers.We strive to deliver dock-to-stock components, on time and within budget.

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South Haven Coil $$$
placeholder image Sag Harbor Industries, Inc. Johnson Electric Coil Company PolyTech Coil Winding Communication Coil, Inc. South Haven Coil

Toroidal coils offer both a higher inductance and a higher "Q" factor, which refers to the measurement of the efficiency of the coil's inductive reactance to its resistance at a set frequency, than solenoid coils. Able to be used for a wide range of applications, toroidal coils are necessary components in many industries just as its fellow coils, induction, choke and magnetic are: power generation, for use in power transformers, current transformers and more; electronics, for use in energy meters for testing of radio equipment and more; and industrial manufacturing, for use in instrument transformers, high-frequency coils and switched-mode power supply (SMPS) transformers for power supply control.

Although many types of electrical coils are used in these and other industries, their uses vary depending on the coil itself. Just one example of the variance is how the choke coil serves to protect power lines while the toroidal works in the actual transformers. This group of tools is very versatile.

Toroidal coils are easily distinguished from the various other types of electric coils because of their unique design. Instead of having a cylindrical core, toroidal coils have a doughnut-shaped core that the wire is wrapped around in very small coils. With a smaller number of turns required, the toroidal coil is able to provide a closed magnetic path.

This means that the magnetic flux of the coil is primarily confined to the coil's core, thus preventing the energy provided from being absorbed by any objects in close proximity to the coil. As a result, toroidal coils are pretty much able to serve as a self-shield and do not require external shielding unlike many other types of electric coils. The magnetic flux of the toroidal coils occurs as a result of an alternating current flowing through the coil.

An alternating current varies from a direct current in that the current flow will periodically change direction, whereas a direct current maintains one singular direction of current flow. In addition, the magnetic flux of the coil changes in proportion to changes in the current. Toroidal coils can be manufactured with or without a base, and when manufactured with a base may be mounted either horizontally or vertically.

Toroidal Coils Informational Video