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.

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  |  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

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 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