1. Rod Inductors: "Assistants" in Signal Transmission and Filtering
Rod inductors take a ferrite rod as the core, with wires wound around it. The high magnetic permeability of ferrite can enhance the inductance value. Their functions are concentrated on signal transmission and filtering.
In terms of signal transmission, they are crucial for the antenna circuits of devices such as radios. When radio waves pass through the ferrite rod, the coil induces a corresponding electrical signal. The ferrite rod concentrates the magnetic field, improving the receiving sensitivity and ensuring the stable transmission of audio signals.
In terms of filtering, in the power supply or signal circuits of devices like electronic toys, rod inductors can generate high impedance to specific clutter, filter out high-frequency clutter, and prevent abnormal device functions.
2. Three-Phase Common-Mode Inductors: "Guardians" Against Interference
Three-phase common-mode inductors are mostly used in three-phase circuits. Three sets of coils with the same number of turns and the same winding direction are wound on the same magnetic core, corresponding to the three phase wires of the three-phase circuit. Their core function is to suppress common-mode interference — that is, interference between the three phase wires and the ground. Such interference can cause unstable device operation and data errors.
When common-mode interference occurs, the interference signal flows through the three sets of coils, generating a same-direction superimposed magnetic field in the magnetic core. This makes the inductor exhibit high inductive reactance to the interference, significantly weakening the spread of the interference. They are widely used in three-phase motor control circuits and frequency converters. For example, after a frequency converter is connected to a three-phase common-mode inductor, it can prevent the interference generated by the internal switching components from affecting the frequency converter itself and other equipment in the power grid.
3. Air-Core Inductors: "Key Players" in High-Frequency Circuits
Air-core inductors have no magnetic core; they are made by winding wires into coils. Their magnetic permeability is determined by air, which is stable, and there is no problem of magnetic core saturation, making them suitable for high-frequency circuits.
Firstly, they act as tuning inductors in radio frequency (RF) circuits. The inductance value can be accurately controlled by adjusting parameters such as the number of coil turns and the coil diameter. When combined with capacitors to form an LC resonant circuit, they can realize the selection of signals with specific frequencies and ensure the accuracy of wireless communication.
Secondly, they are used for high frequency filter inductor. In devices such as radar and satellite communication equipment, air-core inductors can generate impedance to high-frequency clutter. Moreover, without a magnetic core, they have low loss, reducing signal attenuation and ensuring the quality of signal transmission.
Thirdly, they are suitable for high-frequency and high-current scenarios. For example, in high-frequency induction heating equipment, air-core inductors have a simple structure and good heat dissipation performance. They can withstand high currents, generate an alternating magnetic field to heat metals, and maintain long-term stable operation.
Summary
Rod inductors ensure signal transmission and filtering, three-phase common-mode inductors suppress interference in three-phase circuits, and air-core inductors are suitable for high-frequency scenarios. Understanding their functions is helpful for circuit design and maintenance, and also lays a solid foundation for the study of electronic technology.
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