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This section provides an overview for toroidal coils as well as their applications and principles. Also, please take a look at the list of 8 toroidal coil manufacturers and their company rankings. Here are the top-ranked toroidal coil companies as of December, 2024: 1.HBR Industries Inc, 2.Renco Electronics Inc., 3.Torelco LLC.
Table of Contents
Toroidal coils are coils made by winding an electric wire around a circular magnetic core.
By forming a closed magnetic circuit called a toroid, toroidal coils have characteristics different from those of ordinary coils. In a coil with wires wound in a cylindrical shape, the induced magnetic field lines are radiated outward through the coil, which may affect surrounding materials.
Toroidal coils can minimize the effect on the surroundings because the magnetic field lines are closed.
Toroidal coils are used in applications that take advantage of the characteristics of the closed magnetic circuit structure with low leakage flux. They are widely used in electronics, such as choke coils in power supply circuits, filters for eliminating harmonics in high-frequency circuits, and inductors and capacitors.
For example, in cellular phones and wireless LAN, ordinary inductors may not work properly because they are affected by the environment near the circuit in the ultra-high frequency band. Toroidal coils can be used to solve this problem.
Toroidal coils are also used as coils for large equipment such as nuclear fusion devices, superconducting magnets, or charged particle accelerators. They are also used in stator-side coils for electric motors.
A coil wound with an electric wire generates a magnetic flux at right angles to the wire when an electric current flows through it. Toroidal coils consist of copper wire wound around a doughnut-shaped toroidal core. Because the core is a circle, the magnetic flux stays inside and hardly comes out to the outside. If the copper wire is wound many times, the magnetic fluxes overlap and a strong magnetic field can be obtained.
Since the magnetic flux generated does not easily leak outside, the coil efficiency is extremely high, and the magnetic flux has the advantage of hardly affecting other elements. The cores used in toroidal coils are made of iron-based steel sheets. Specifically, FeSi silicon steel plate cores, nanocrystalline alloy cores, FeSi-based alloy cores, and Fe(CO)5 carbonyl cores are used. They have low flux leakage and stable inductance.
Toroidal coils can confine magnetic field lines generated by passing an electric current through a coil wound around a doughnut-shaped magnetic body, enabling compactness and high magnetism and preventing leakage of magnetic field lines to the outside.
The three basic components of an electric circuit are the RLC, the "R" resistance, the "L" inductance (the device is an inductor), and the "C" conductance (the device is a capacitor).
Toroidal coils are inductors that provide greater inductance than air-core coils, and the higher the frequency of the current flowing through them, the greater the effect, so they can be used to remove harmonics. Adding another coil to the magnetic material of the toroidal coils makes a high-frequency transformer.
Furthermore, by combining it with a capacitor C, which is inversely proportional to the frequency, and the higher the frequency, the easier it is for the current to pass through, various filters can be configured.
1. Smoothing Action
Toroidal coils have the property that when a current tries to flow through a copper wire, the coil tries to keep the current flowing, and when the current decreases, the coil tries to keep the current flowing. This is called Lenz's law, which states that when the magnetic flux through a closed circuit changes with time, an induced electromotive force is generated that produces a magnetic field in a direction that prevents the flux from changing.
Toroidal coils are used for smoothing in power supply circuits that convert AC to DC and for high-frequency filters, taking advantage of this property.
2. Mutual Induction
Mutual induction is the induction of power from one coil into the other when two coils are placed close together. Using this principle, toroidal coils are used in power transformers.
The output voltage of a power transformer varies according to the ratio of the number of turns of the primary coil to the number of turns of the secondary coil; multiple voltages can be obtained by installing an intermediate tap on the secondary coil.
3. Electromagnet Action
The electromagnet of the coil is used in relays that open and close circuits. It is also applied to generators, electric motors, bells, buzzers, etc.
*Including some distributors, etc.
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HBR Industries Inc, founded in 1979 and located in San Jose, California, is a manufacturer of custom wound coil products. The company’s diverse range of products includes air coils, water coils, electromagnetic coils, bobbin wound coils, and flat wire coils. These coils find applications in electronics, telecommunications, HVAC systems, automotive, and industrial automation. The company’s products play essential roles in applications such as signal filtering, heating and cooling regulation, electromagnetic actuation, and compact electronic device design, offering tailored solutions to meet the specific needs of each industry.
Renco Electronics Inc. was founded in 1955 and is headquartered in Florida, United States, as a manufacturer of quality inductors, transformers, and subassemblies for thousands of products from aerospace systems to consumer appliances, and everything in between. The end markets and customer base of Renco exhibit a high degree of complementarity with the current business operations. This presents the possibility of enhancing meaningful account relationships and exploring cross-selling prospects between our two organizations. The efficiency of Renco's design and manufacturing cycle is greatly improved by its robust worldwide network of proprietary supplier partnerships.
Tried Magnetics was founded in the 1940s and is based in Perris, California. The ISO 9001:2015-certified company serves industrial equipment, renewable energy, medical equipment, and other industries as a manufacturer of components using standard and custom magnetic components including transformers, power supplies, and inductors. The company’s custom magnetics division encompasses power and audio transformers, chokes, and power supplies used across industries. The company’s engineering development kits and design sample kits include a sampling of power ranges, sizes, and packaging styles within specific product lines to assist customers in choosing final designs for prototyping.
Torelco LLC, founded in 1962 and located in Alpha, New Jersey, is a supplier and manufacturer of custom wound magnetic devices. The company’s diverse range of products includes transformers in various styles, including toroids, bobbins, and cores. These devices have a range of general uses in industries such as electronics, telecommunications, industrial automation, power supply, and renewable energy. The company’s products are used for voltage control, signal processing, and power distribution, serving the specific needs of customers in diverse sectors.
Coilcraft was founded in 1945 and is headquartered in Cary, Illinois. The company is a designer, manufacturer, and distributor of high-performance magnetic components for industries including automotive and computing. The company’s standard products include power devices such as inductors, RF devices, transformers, and EMI components. The company’s automotive division offers transformers, inductors, chokes, and filters operation down to -40 degrees. The company also offers design tools to help customers understand the correct product for their needs and optimum system operational parameters.
Efficient Toroidal Coil Corporation, founded in 1994 and located in Maharashtra, India, is a manufacturer of toroidal transformers and wire-wound potentiometers. The company offers a broad range of products that include linear potentiometers, rheostats, wire-wound resistors, current transformers, and toroidal power transformers. The company’s products find broad applications in industries such as automotive and aerospace, lighting, and industrial systems. Its products are used in power supplies and electronics, current measurement and monitoring, position sensing across industries, controlling electrical current, and employing electronic circuits for precise resistance values that are used to improve the functionality of diverse devices and equipment.
Sag Harbor Industries, Inc., founded in 1946 and located in Harbor, New York, is a manufacturer of automated and semi-automated equipment. The company offers a broad range of products, including coils, cable assemblies, transformers, toroids, and door locks. These products find general use across diverse industries such as electronics, telecommunications, automotive, industrial automation, and security. The company’s products are used in applications including signal processing, power conversion, data transmission, and access control, meeting the needs of customers in different sectors.
Ranking as of December 2024
Derivation Method| Rank | Company | Click Share |
|---|---|---|
| 1 | HBR Industries Inc |
22.4%
|
| 2 | Renco Electronics Inc. |
13.2%
|
| 3 | Torelco LLC |
13.2%
|
| 4 | Triad Magnetics |
13.2%
|
| 5 | Coilcraft Inc. |
11.8%
|
| 6 | Efficient Toroidal Coil Corporation |
9.2%
|
| 7 | Nikko Electric Co., Ltd. |
9.2%
|
| 8 | Sag Harbor Industries, Inc. |
7.9%
|
Derivation Method
The ranking is calculated based on the click share within the toroidal coil page as of December 2024. Click share is defined as the total number of clicks for all companies during the period divided by the number of clicks for each company.Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
United States of America
|
5 | 71.4% |
|
India
|
1 | 14.3% |
Japan
|
1 | 14.3% |
13 products found
13 products
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