744052680 Inductors, Coils, Chokes

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Fixed Inductors

A fixed inductor, also known as a permanent magnet inductor (PML), is an electronic component commonly used in a variety of applications. It is an inductor with a stable, fixed inductance. In other words, the inductance of the inductor does not change with time or external variations in voltage or current. As a result, it is the most reliable of all inductors, and therefore it is the most widely used inductor in circuit design.

Characteristics

Fixed inductors are the simplest of the three types of inductors: transformer, switch and fixed. The inductance of a fixed inductor is determined by its physical size, its core material type and the number of turns of wire in the coil. The inductance of the coil does not change with changes in current or voltage. Fixed inductors are typically used to create an AC or DC field around a core material to generate the electromagnetic field needed for a specified application.

744052680 Applications and Working Principle

Fixed inductors are used in a wide range of applications. For instance, they are commonly used in laptops, smartphones, and embedded systems to power components like circuits or displays. Fixed inductors are also used in telecommunications and are used to couple voltages from one device to another. In addition, fixed inductors are used in motor control for stabilizing voltage during start-up and maintaining constant voltage when operating. The operation of a fixed inductor is based on Faraday\'s Law of Induction which states that a change in magnetic field produces an electric current and that an electric current produces a magnetic field.

Fixed inductors generate a magnetic field when current passes through them. The magnetic field then induces a current in the vicinity of the winding. The current induced in the winding is proportional to the rate of change of magnetic flux, which is in turn proportional to the rate of change of the current in the primary winding. This results in a capacitive action as the voltage is increased and vice versa. This process allows the inductor to act as a stabilizing device for the circuit.

Advantages

Fixed inductors have several advantages over other inductor types. They are typically simpler in design and are cheaper to manufacture due to their lack of multiple components, such as in a transformer or switch inductor. They also have a relatively low operating temperature, and a wide variety of sizes is available to accommodate even the most complex circuitry. Moreover, fixed inductors provide a more uniform current output than other types of inductors, making them particularly suitable for power applications.

Disadvantages

Despite having several advantages, fixed inductors also have several drawbacks. They are not particularly versatile, meaning that they may not be the best choice for applications that require a variety of inductance values or changing inductance values over time. Furthermore, fixed inductors require a larger core compared to other inductor types, making them bulkier and taking up more real estate on the board. However, this can be offset by the fact that they are usually cheaper and simpler.

Conclusion

Fixed inductors have a wide range of applications and are a reliable and cheap choice for most applications. They are the simplest and most cost-effective type of inductor available, and have a wide range of sizes and inductance values available. Fixed inductors are typically simple to manufacture and are relatively low temperature and uniform in current output. Despite this, they have several disadvantages, including their lack of versatility and the need for a larger core. However, these drawbacks can be offset by their cost and simplicity.

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