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. Read More…

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  |  800-724-5952

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.

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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.

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Johnson Electric Coil Company $$$

Bristol, CT  |  860-584-0927

We are an ISO 9001:2015 certified company which is internationally known for manufacturing high quality electromagnetic-coils. It is our goal to provide quality products, a commitment to speedy delivery, and competitive pricing. We understand that every application is unique, so we encourage you to contact us to discuss your specific requirements. Call us at 1-860-584-0927 and find out what our 50+ years of experience can do for you.

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Quality Coils, Inc. $$$

Ormond Beach, FL  |  386-671-7406

Where others have failed, Standard Technology overcomes the most difficult design challenges for custom electric coils, solenoids, sensors and electromagnets. With years of experience, full engineering consulting services and in-house machine capabilities, we meet clients’ exact needs, from AC/DC coils to coil assemblies. We have produced encapsulated and over-molded coils for many industries.

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Standard Technology Inc. $$$

Binghamton, NY  |  800-224-4477

Endicott Coil Company is an expert manufacturer of an impressive range of coils. Created in wire gages of 4 AWG – 50 AWG with insulation capacities up to 220 degrees, our coil assortment consists of molded coils, custom coils, self-supported coils, encapsulated coils, inductors & ferrite core coils. As a leading electric coil manufacturer, ECC’s products are used in a wide range of applications.

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Endicott Coil Company, Inc. $$$

Yardville, NJ  |  609-585-6600

We are a dedicated manufacturer of electric coils and you will not be upset with the capabilities of our teams. All of our high performance devices are competitively priced and we can design any coil to match your unique requirements. We are a focused supplier for OEM, military, precipitator and air pollution control industries. Please give one of our representatives a call today to learn more information!

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Stonite Coil Corporation $$$
placeholder image Sag Harbor Industries, Inc. Johnson Electric Coil Company Quality Coils, Inc. Standard Technology Inc. Endicott Coil Company, Inc. Stonite Coil Corporation

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