Field Coils

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

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. Read Moreā€¦

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  |  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.

Request A Quote

Sag Harbor Industries, Inc. $$$

Bristol, CT  |  800-825-4319

At Classic Coil, we put an emphasis on manufacturing high quality electric coils. Our coils are engineered for a variety of industries, and we utilize state-of-the-art equipment to create these products with precision. Our teams can manufacture solutions with various materials including copper, gold, silver, and platinum. Call us today or visit our website to learn more!

Request A Quote

Classic 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.

Request A Quote

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!

Request A Quote

Custom Magnetics, 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.

Request A Quote

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

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