This section provides an overview for variable inductors as well as their applications and principles. Also, please take a look at the list of 10 variable inductor manufacturers and their company rankings. Here are the top-ranked variable inductor companies as of February, 2024: 1.MinebeaMitsumi Inc., 2.KOA Corporation.
An inductor (coil) is an electronic component made by wrapping copper wire around an iron core. When an electric current is applied to the copper wire in the inductor and the amount of the current is varied, it generates an induced electromotive force. This is called inductance and is expressed in units of Henleys (H).
A variable inductor is a device whose inductance can be varied by placing a small driver or adjusting the rod on top of the device and rotating a knob to slide the internal iron core up and down.
In general, inductors are used in many electrical products. A familiar example is an AC transformer.
Since it transmits high frequencies, it is also used in various wireless devices (WiFi and non-contact IC chips) and microwave ovens. They are also used in fluorescent light ballasts and various electrical products and are indispensable components for rectifying electronic circuits.
Variable inductors are used in a limited number of applications, such as tuning circuits for car tuners, but are now used less frequently due to the digitization of circuits.
The basic principle of operation of variable inductors is the same as that of fixed inductors.
When a DC current is applied to the coil, a magnetic field is generated in the iron core, and the core becomes an electromagnet.
When a voltage is initially applied or when the voltage is lowered, an induced current flows instantaneously in the moving wires. This causes electrical energy to be stored in the form of a magnetic field.
After a magnetic field of a certain strength is generated, a direct current flows, just like an ordinary copper wire. In contrast, when an alternating current flows through an inductor coil, a magnetic field of varying magnitude is generated in the iron core.
As the magnetic field changes, induced electromotive force in the opposite direction of the current is generated, resulting in resistance (inductance). If an alternating current continues to flow, an induced electromotive force in the opposite direction is always generated, so the current continues to have difficulty flowing.
In the case of an inductor coil, DC current can pass through smoothly, but AC current is challenging to flow because of the resistance generated. Therefore, it is an electronic component with the opposite characteristics of a capacitor, allowing AC current to pass through but not allowing DC current to pass through.
*Including some distributors, etc.
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MagTop Company, founded in 2005, is a manufacturer of magnetic components products for technological enterprises. The main product lines include Transformers, Inductors, Coils, Filters, and RJ45 connectors with Lan transformers. These products are used for digital equipment, personal computers, AV equipment, auto products, communication equipment, and medical machines. It also offers various testing and inspection equipment. Its products are distributed to China mainland, Southeast Asia, Europe, North America, and other regions. The company is certified with ISO 9001, RoHS, and CE.
Murata Manufacturing Co., Ltd. (Murata Manufacturing) was founded in 1944 and is headquartered in Nagaokakyo, Japan. Murata Manufacturing designs, manufactures, and sells ceramic-based passive electronic components and solutions globally. The company operates through components, modules, and others segments, serving communications, mobility, industrial, healthcare, and personal electronics customers. They company's product offerings include noise suppression products, quartz devices,RFID devices, phase shifters, and wireless connectivity platforms. Services such as webinars and video library are also available for existing and potential customers alike.
KOA Corporation, established in 1940 in Minowa-machi, Japan, is a manufacturer of electronic components. The company provides an extensive product range including resistors, current sense shunt resistors, fuses, thermal sensors, and inductors. These quality components find applications in industries such as automotive, ecology, energy conservation, telecommunications, power supply units, and home appliances. Operating under the guiding principles of circulation, finite resources, harmony, and enrichment, it continues to provide sustainable electronic solutions to cater to the ever-changing demands of global industries.
MinebeaMitsumi Inc. was incorporated in 1951in Japan and manufactures and supplies machined components, and electronic devices and components globally. It operates through four segments: machined components, electronic devices and components, MITSUMI Business, and the U-Shin business segment. MinebeaMitsumi specializes in bearing products including spherical, roller, rod end, and ball bearings for aerospace. MinebeaMitsumi also produces products including precision mechanical assemblies, fasteners, other special components including clutches and brakes, motors, blowers, sensors and lighting devices. Additionally, MinebeaMitsumi offers its products for use in PCs and peripheral equipment, information and telecommunications equipment, household electrical appliances, automobiles, and aerospace.
Shiv Dial Sud & Sons, brand name Supertek, founded in 1943 is a manufacturer of educational teaching aids, laboratory glassware and essentials, based in India. The company is an ISO 9001:2015 quality systems certified organization, with almost eight decades of experience, exporting its products to more than 80 countries worldwide. It channels its products through a comprehensive network of dealers and distributors. Its state-of-the-art manufacturing facilities are located in Ambala, consisting of 5 production units well equipped with high-precision machinery for mass production of standard parts, electronic and electrical divisions, glassware units, electroplating and powder coating lines.
Kintronic Labs Inc., established in 1949 with headquarters in Bluff City, Tennessee, USA, is a distributor, manufacturer, and integrator of broadcast antennas and telecommunication systems. The company's extensive product line includes antenna tuning units, monitoring systems, RF components, short-wave antennas, and equipment racks. The company also offers various equipment and design solutions for AM colocation, custom prefabrication of buildings for telecommunications, and custom transmission tower and transmission line fabrication and installation. The company serves the AM, shortwave, FM, and TV communications markets, among others.
*Including some distributors, etc.
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