Field Coils

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In a rotating machine, the field coils are wrapped around an iron magnetic core that guides the magnetic field lines. The magnetic coil has two parts, a stator and a rotor. The stator is stationary and the rotor rotates within it. The magnetic field lines pass in a continuous loop, called a magnetic circuit, from the stator to the rotor and back to the stator again.

Field Coils A field coil is an electromagnet used to generate a magnetic field in an electro-magnetic machine, typically a rotating electrical machine such as a motor or a generator.

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

It consists of a coil wire through which a current flows.

Field coils, which energize, may be attached to the stator or the rotor. A rotating machine's magnetic path is characterized by poles, or locations at equal angles around the rotor at which the magnetic field lines pass from stator to rotor or vise versa. The stator and rotor are classified by the number of poles they have. Most configurations use just one coil per pole, but some older or simpler arrangements use a single fuel coil with a pole at each end.

Varnished CoilVarnished Coil - Sag Harbor Industries, Inc.

The wire used to wind a field coil must have a low resistance in order to reduce the amount of power it consumes and to reduce the production of waste heat by ohmic heating. This is important because excess heat in the wires is a common cause of failure. Typically, coils are wound with enamelled copper wire, which is sometimes referred to as magnet wire. However, due to increasing cost of copper, field coils are frequently being wound with aluminum.

Some time ago, before the general availability of lightweight permanent magnets, field coils were routinely used in loudspeakers. Today, field coils provide catalyst services for many usages, such as dynamos, alternators, generators, electric motors, starter motors, magnet coils and electric brakes. Non-rotating machines that use field coils include simple electromagnets as well as complex lab instruments such as mass spectrometers and NMR machines.

To meet the complex needs of the market, field coils are available in many different types, including encapsulated, glass taped, tape wrapped, injection molded, transfer molded and loose wound, bobbin wound or self-supported.

Field Coils Informational Video