Induction Coils

A reliable source for Electric Coil information and leading Electric Coil Companies & Manufacturers.

The term induction refers to the act of generating electromotive force in a closed circuit by means of a change in the current flow. Ignition coils and induction coils share the nickname of “spark coils”, since an ignition coil is a type of induction coil. Read Moreā€¦

Induction Coils An induction coil is a type of disruptive-discharge electric coil. It is used to transform low voltages of direct current flow into high-voltage pulses or a high-voltage alternating current flow.

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. $$$

North Manchester, IN  |  260-982-8508

At Custom Magnetics, we manufacture transformers and coils, custom designed, for electrical and electronics industries. Our products often serve applications such as audio amplifiers, intercoms, power supplies, transducers, transportation, power generation, etc. Many types of transformers are produced including laminated, toroidal, ferrite cores of all shapes and sizes, and R-Core. Call today!

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Custom Magnetics, Inc. $$$

McAllen, TX  |  888-664-9495

Industrial Coils, LLC is a leading manufacturer that specializes in high quality custom solenoid coils wound to customer's specifications 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 us make great parts for you!

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Industrial Coils, LLC. $$$

Marlton, NJ  |  800-822-9190

Repco Inc. was founded in 1976. Our name stands for Replacement Electrical Parts Co. The products currently sold by Repco are electrical contacts and coils for industrial control and carbon brushes for industrial motors. The business is located approximately 12 miles east of the city of Philadelphia in Marlton, NJ.

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Repco Inc. $$$
placeholder image Sag Harbor Industries, Inc. Johnson Electric Coil Company Quality Coils, Inc. Custom Magnetics, Inc. Industrial Coils, LLC. Repco Inc.

Induction coils were originally developed in 1836 and were previously known as Ruhmkorff coils, although they were actually invented by a man named Nicholas Callan.

Having been around the longest of currently-in-use electrical coils, induction coils are widely utilized in diverse industries including: medical, for imaging equipment such as x-ray machines; electronics, for equipment such as wireless radio transmitters, telephone circuits, cameras and strobe lights, automotive, for use in ignition systems for vehicles featuring internal combustion engines such as cars, trucks and vans; agriculture, for farming machinery such as balers, combines and tractors; and industrial manufacturing, for use in powering parts and equipment such as vacuum tubes.

Induction coils are also used for heating applications such as induction cookers and induction blankets. When more then one induction coil is being used in one machine, it can also be referred to as a transformer coil.

Induction coils consist of four main parts: a ferromagnetic core, a primary coil, a secondary coil and an interrupter. The ferromagnetic core is typically manufactured from solid iron, solid steel or powdered iron, although solid iron is probably the most popular of the three materials. The primary coil is a heavy gauge of conductive metal wire, commonly copper, that is wound around the core a small number of times (the winding is referred to as turns).

The primary coil is attached to the low-voltage DC power supply. The secondary coil is a finer gauge of the same conductive metal wire, and instead of being wound directly around the core, the secondary coil is wound over the primary coil. The secondary coil, as it is made from a finer gauge, consists of many more turns than that of the primary coil.

The secondary coil is not attached to the DC power supply, but is instead attached to whatever requires powering, serving as a high-voltage output of AC current flow. An interrupter, also referred to as a break, is a magnetically-activated vibrating arm. The interrupter functions within the inductor coil to ensure a quick connection as well as break-up of the current flowing into the primary coil. The interrupter is typically mounted on the end of the induction coil, close to the core.

Induction Coils Informational Video