Unveiling The Magic Of Wireless Power Transfer With Air Core Inductors

A intriguing component that frequently goes unseen but is essential to the seemingly mystical phenomenon of wireless power transfer is the air core inductor. This amazing technology uses electromagnetic energy to carry electrical energy through the air, circumventing the requirement for physical connections. In the blog below, we set out on an adventure through the world of air core inductors, learning about their inner workings, uses, and the astounding idea of wireless charging.

The air core inductor consists of a coil of wire wound around a plastic or ceramic non-magnetic core. The distinguishing characteristic of air core inductors, which distinguishes them from their iron or ferrite core equivalents, is the lack of a magnetic core. But how does this apparently straightforward mechanism make it possible to transmit energy via the air?

Electromagnetic Induction

The principles of electromagnetic induction, a phenomena identified by the great Michael Faraday in the 19th century, are at the foundation of the magic of air core inductors. Faraday's law states that as an electric current passes through a wire, a magnetic field is created all around it. On the other hand, when a magnetic field crosses a loop of wires, it causes an electric current to flow through the loop. The foundation for wireless power transfer utilizing air core inductors is this fundamental idea, and this is how it works.

• A power source, such as an electrical outlet, is connected to an air core inductor coil on the transmitting side of the wireless charging system. This coil produces a magnetic field around it when an electric current runs through it.
• The receiving apparatus, which is furnished with a second air core inductor coil, is positioned close to the transmitting coil. The transmitting coil's fluctuating magnetic field causes the receiving coil's electric current to flow.
• This induced current in the receiving coil is then transformed back into electrical energy, which can be utilized to power the device or recharge a battery.

In air core inductors, the lack of a magnetic core enables effective transmission of magnetic fields and, subsequently, electrical energy via the air. The foundation of many applications, including wireless charging pads for cell phones, electric toothbrushes, and even electric vehicle charging systems, is the wireless power transmission principle.

Additional uses besides wireless charging

Although one of the most well-known uses for air core inductors is wireless charging, they have other uses as well. Here are a few more applications for air core inductors.

• RFID Technology: Air core inductors are used in tags and readers for radio-frequency identification (RFID) systems. These inductors are essential to the operation of RFID tags, which are utilized in applications including contactless payments, inventory management, and access control.
• Wireless communication: Air core inductors are used in wireless communication systems, such as RF transmitters and receivers, to transmit and receive data wirelessly. They are an essential component of gadgets like walkie-talkies, remote controls, and Wi-Fi routers because they aid in the transmission and receiving of radio signals.
• Antennas: Air core inductors are used to build antennas for many different purposes, such as radio transmission, cellular communication, and satellite communication. They aid in fine-tuning antennas to certain frequencies for the best signal transmission and reception.

The Future Of Air Core Inductors

The importance of air core inductors in enabling wireless power transfer and wireless communication will only increase as technology develops. The effectiveness and reach of wireless charging systems are likely to be significantly enhanced by developments in materials and design, making them a crucial component of our increasingly linked world. Air core inductors are undoubtedly the unsung heroes of contemporary technology, whether it is for facilitating flawless data transmission or charging your smartphone wirelessly.

Miracle Electronics is one of the most well-known air core inductor manufacturers in India, where you can get the finest products, all certified for Genuity and compliance to standards.

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Isolation Transformers – Why They Are Used - Miracle Electronics

Industrial applications require products that follow stringent rules and fulfill rigorous requirements. In such applications, the equipment used should not only functionally effective, but also safe. Highly regulated market sectors like industrial control, energy, and medical rely on the smooth functioning of their electrical devices. Any interruption in the working may cause critical delays and errors; and thus, unwanted outcomes. To help bring the required results in applications where high working voltages, surges, and transient voltages are present, high isolation transformers can help to meet the safety requirements. These transformers are designed to meet the most stringent safety standards.

Choosing the Right Inductor for Your Application

Inductors are two-terminal electrical components designed to oppose currents passing through them by inducting an electromotive force. They are primarily used for signal processing and analog circuits in power electronic applications. In SMPS devices, they are used as energy storage components. They store energy in the form of magnetic fields as long as current flows through them.

Inductors are estimated as open circuits for AC signals and as short circuits for DC signals. However, not all inductors are created equal. There are a variety of inductors available in the market that differ in terms of performance, size and cost. Also, it is the number of turns in the coil, the coil length, the coil area and core material that affect the amount of inductance of an inductor. All these factors and more must be considered while selecting an inductor for your application. Choosing the right type of inductor is highly important. Here are a few factors explained to help you choose an appropriate inductor.

All You Need To Know About Inductors

Inductors are passive two-terminal electrical components that resist any changes in electric current passing through them. Majority of inductors are made of copper, and they comprise of a conductor in the form of a wire wound into a coil. Energy is stored in the coil as magnetic field as long as current flows through it. When current changes, the magnetic field induces a voltage in the conductor that opposes the change. The capacity/inductance of an inductor depends upon the material used, the number of coils and the diameter of the inductor. This inductance is conveyed in Henries unit, which is the outcome of the magnetic flux created around the conductor by the flow of current.

Structure of inductors

Inductors have a very simple and easy-to-understand structure. They have a coil of conducting material of insulated copper wire wrapped around a core made of plastic or ferromagnetic magnetic material. These materials are used because of their high permeability, meaning the property of supporting electromagnetism. This property of permeability increases the inductance of any core and helps in getting maximum resistance.

Applications of inductors

·        Inductors are used in analog circuits and signal processing. Large inductors are used in power supplies which remove residual hums and other fluctuations from the direct current output with the help of filter capacitors. They are also used as energy storage devices in SMPS to produce DC current, where the inductor supplies energy to the circuit for current flow during the “off” mode.

·        Tuned circuits, which are formed when inductors are connected to capacitors, are used in radio frequency equipment like radio transmitters and receivers. They are used to select a single frequency from a composite signal, and to generate sinusoidal signals in electronic oscillators.

·        Transformers, formed with two or more inductors in proximity with coupled magnetic flux, are used in every electric utility power grid.

Types of inductors

There are a variety of inductors available, out of which the below three are the most commonly used. Miracle Electronics is the Leading Inductor Coil Manufacturer in India, where you can get a variety of inductors that have no air gap, produce no noise, have a low electromagnetic radiation and are built with a very safe design with superior quality wiring and high durability index.

·        Ferromagnetic/Iron core inductors – These inductors have iron or ferrite in their core to increase inductance because iron is more permeable than other metals. Transformers and heavy pieces of machinery use these types of inductors because they require high inductance and low resistance. However, the magnetic properties of the core may cause side effects, which may alter the behavior of the inductor. Thus, either special construction or core replacement from time to time is required.

·        Air core inductor – Unlike ferromagnetic conductors, air core conductors do not have any metal in their core. Instead, they have materials like plastic, ceramic or just air in the space of winding. Inductance in such inductors is lesser and they can be used for higher frequencies as they have no limitations of core loss. However, if there are many mechanical vibrations in the system, the desired inductance of air core inductors will be different.

·        Laminated core inductor – Inductors that require low inductance are made from laminated core materials, which are a number of laminated sheets that are covered with insulation material. These inductors are used to decrease eddy currents between the sheets so that energy loss is greatly reduced.

SUMMARY

Inductors are two-terminal electrical components with a coil of wire wrapped around a core that resist changes in electric current passing through them. Inductors store energy in the coil as magnetic field, which induces a voltage to oppose any change in current felt.