Inductive Components' Characteristics
Inductance is a physical quantity that measures the ability of a coil to generate electromagnetic induction. When an unstable current is applied to a coil, a varying magnetic field is produced around it. The greater the power applied to the coil, the stronger the magnetic field becomes, and vice versa (before the magnetic induction reaches saturation). Inductance is generally divided into hollow-core inductance and magnetic-core inductance. Hollow-core inductance has a fixed inductance value and is simple to apply.
Inductor manufacturers have noted that large core inductor applications are widespread in industry, with the accuracy of the inductance value being a crucial issue, holding significant importance both theoretically and in practical applications. Analysis is conducted using the formula L = μ × Ae × N^2 / l, where L represents the inductance, μ denotes the magnetic core's permeability, Ae indicates the magnetic core's cross-sectional area, N signifies the number of turns in the coil, and l is the magnetic path length of the core. Therefore, once an inductor is produced, Ae, N, and l are fixed values, and only the permeability will affect the inductance value upon the inductor's completion.
Inductors play a critical role in circuits.
Inductor manufacturers believe that electricity generates magnetism, and magnetism generates electricity, complementing each other and manifesting together. When a steady current flows through a wire, a steady magnetic field is always induced around it. When this wire is bent into a spiral coil, applying the law of electromagnetic induction, we can conclude that a magnetic field is produced within the spiral coil. This spiral coil is placed within the current circuit. When the direct current in this circuit changes (such as from small to large or vice versa), the magnetic field within the inductor must also change. The resulting changed magnetic field will generate a "new current." According to the law of electromagnetic induction, this "new current" must be in the opposite direction to the original direct current, thereby offering resistance to the change in direct current over a short period of time. However, once the change is completed and the current stabilizes, the magnetic field no longer changes, and there will be no obstacles.
From the above process, the inductor manufacturer explains that the role of an inductor is to resist changes in current. For instance, during the transition from a low to high current, an inductor exhibits a "lagging" effect, which can resist such changes within a certain timeframe. On the other hand, due to its ability to store a certain amount of energy, an inductor can maintain the original state as much as possible when changes occur. However, it is important to note that when the energy is depleted, it can only follow the current. Owing to its "online and offline" characteristics, an inductor can play a significant role in circuits. In printed circuit boards, inductors are mainly used for energy storage, filtering, delaying, and oscillating, and are crucial components for ensuring stable and safe operation of the board.
In summary, the inductor manufacturer points out that inductors often work alongside capacitors in circuits, forming LC filters, LC oscillators, and more. Additionally, the characteristics of inductance are utilized to manufacture chokes, transformers, relays, and more.
