## Introduction to the basics of Hollow coil inductor

1. The unit of the induction coil: generally called Henry, referred to as "Henry" (H) 1H = 103mH = 106uH, the symbol is "L".

2. Types of inductors: Inductors can generally be divided into cored and coreless types: one is a hollow inductor and the other is a core inductor; it can also be classified according to the installation form, and can be divided into vertical and horizontal and small fixed types. Because it can be divided into high-frequency inductance coil and low-frequency inductance coil according to the working frequency. Hollow inductance is generally small, while the core inductance is relatively large (the main role of the core is to increase the inductance). The core inductance is divided into a magnetic core and an iron core, and the general magnetic core has a larger inductance than the iron core.

3. Nominal method and parameters of inductor:

There are generally two types of Hollow coil inductor nominal methods: the first is the direct method, and the second is the color method. The direct labeling method is to print the inductance on the inductor, and the color labeling method is to use the color ring to indicate the inductance. The unit is generally mH, the first two digits indicate the significant digits, and the third digit indicates the magnification. The fourth bit is for error. The factors that affect the amount of inductance are generally: the number of turns, that is, the number of knee-covered coils. The more turns, the greater the amount of inductance; the cross-sectional area: the thicker the thickness of the knee-covered wire, the greater the amount of inductance; Core inductance: Inductive coils have a special hindrance to AC power. Inductive reactance and capacitive reactance are similar. The inductance of an inductor is generally divided into two factors, namely the formula for calculating the inductance and frequency inductive reactance: X2 = 2∏FL The frequency of the alternating current, and L is the inductance of the inductor.

The rated current is a very important parameter of the inductor. The rated current refers to the maximum current allowed by the inductor during normal operation. In use, the actual working current of the inductor must be less than the rated current, otherwise the inductor coil will be seriously heated and may even be burned.

Figure of merit: It is labeled as Q value, which is represented by the letter "Q". The Q value indicates the quality of the coil. The higher the Q value, the smaller the power loss of the inductor coil and the higher the efficiency.

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