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Inductive coil performance factors

For the inductor coil, there are many performance indicators. For example, there will be a certain amount of resistance on the wire of the inductor coil, but this resistor is very small and has reached the point of neglect. However, there are some factors that cannot be ignored. Now, Xiaobian is the main factor affecting the inductance coil.
1. The inductance is a physical quantity of an electronic component. After the magnetic flux of the coil changes, the potential generated in the coil is called electromagnetic induction. The potential generated can be called the induced electromotive force. The amount of flux change is proportional to the number of turns of the coil, but the way the wire is wound, the size of the core, and the material of the core are affected.
The basic unit of inductance is referred to as Henry, which is indicated by the capital letter "H". There are other units of millihenry (mH) and microhenry (μH), the relationship of transformation is: 1H = 1000mH, 1mH = 1000μH.
2, the inductor coil will have a hindrance to the AC current, this amount we call the inductive reactance, the letter is: XL, the physical unit is ohm, the symbol Ω. The relationship between the equations is: XL = 2πfL (where the inductance is L and the AC frequency is denoted by f)
3. The quality factor Q is used to express a physical quantity of the coil, and Q is equal to the ratio of the inductive reactance to the electric resistance, that is, Q=XL/R. Refers to the ratio of the inductive reactance exhibited by the inductor to its equivalent loss resistance when operating below an indefinite frequency AC voltage. The better the quality factor of the inductor, the smaller the loss of the inductor and the higher the efficiency. The quality factor of the coil is usually only tens to hundreds, and generally does not exceed one thousand. The quality factor of the inductor is related to the coil core material, the size of the DC resistor, the dielectric loss of the coil bobbin, and the loss caused by the core material and the shield.
4. The distributed capacitance is composed of two conductors that have different voltage differences and are insulated from each other. Therefore, in any of the two or more of the circuits, as long as there is a differential pressure between the insulated conductors there will be distributed capacitance, but the size is not the same. In high-frequency circuits and precision equipment, measures are taken to reduce the effects of distributed capacitance. If the distributed capacitances are connected together, an equivalent capacitance in parallel with the inductor coil can be formed, denoted by C. The distribution factor and the quality factor of the inductor are inversely proportional to the stability, so the distributed capacitance of the inductor should be as small as possible.
5. Rated current refers to the maximum current allowed by the inductor coil during normal operation. If the current used exceeds the rated current, the inductor is likely to change its performance parameters due to overheating, and even burn out directly due to excessive current.
6. Allowable deviation refers to the allowable error value of the inductance indicated on the inductor coil and the actual inductance. Generally, the accuracy of the inductor used in circuits such as oscillation or filtering is very high, and the allowable deviation is ±0.15 [%]~±0.45 [%]; and the coils for coupling, high-frequency choke, etc. are accurate. The degree is not high; the allowable deviation is ±9[%]~15[%].

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