1. Inductors are energy storage elements, while magnetic beads are energy conversion (consumption) devices; [1] 2. Inductors are commonly used in power filter circuits, while magnetic beads are often used in signal circuits for EMC countermeasures; 3. Magnetic beads are mainly used to suppress electromagnetic interference, whereas inductors focus on inhibiting conductive interference in this aspect. Domestic inductor manufacturers can use both to address EMC and EMI issues. There are two pathways for EMI: radiation and conduction, with different suppression methods for each. Magnetic beads are used for the former, and inductors for the latter.


Inductors often work in conjunction with capacitors in circuits, forming LC filters, LC oscillators, and more. Additionally, the properties of inductance are utilized to manufacture chokes, transformers, relays, and more. Direct Current Pass: This refers to the inductor's conductive state towards direct current, where domestic power inductors allow direct current to pass through "unimpeded" if the resistance of the inductor coil is disregarded. For direct current, the resistance of the coil itself has a negligible阻碍 effect, and is often ignored in circuit analysis. AC Resistance: When AC current passes through an inductor coil, the inductor exhibits a resistive effect on the AC current, which is due to the inductive reactance of the coil.


Good/bad judgment: For surface mount inductors, the reading should be zero at this time. If the multimeter reading is too high or infinite, it indicates that the inductor is damaged. For inductors with more turns and finer wire diameter, the reading can reach dozens to several hundreds. For molded inductors, the DC resistance of the coil is usually only a few ohms. Damage is manifested as overheating or obvious damage to the inductor's magnetic ring. If the inductor coil is not severely damaged but cannot be determined, you can measure its inductance with an inductance meter or use the substitution method to judge. For inductor components, the core and winding are prone to inductance changes due to the temperature rise effect. It must be noted that the body temperature must be within the operating specifications.


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