SK827005 SK827100-AS 480V 60HZ coil

SK827005 SK827100-AS energized wire can generate a magnetic field. According to the right

hand screw rule, the direction of the magnetic field is shown in Figure 1-1. The magnetic field

size is represented by the magnetic field strength “H”. The higher the current, the stronger the

magnetic field, which is entirely generated by the current, zero current, the magnetic field will disappear.

SK827005 SK827100-AS When the live conductor is wound, as shown in the lower figure of

Figure 1-2, it becomes a coil. If you put a current on a wire, each section of the wire will generate a

magnetic field. Inside the coil, the magnetic field generated by each turn of the coil is superimposed. The

two circles shown in the upper figure of Figure 1-2 represent the magnetic field generated by the purple segment of the wire.

Obviously, the larger the current is and the more turns the coil has, the larger the magnetic field generated by

SK827005 SK827100-AS superimposed inside the coil. The size of the magnetic field is expressed by the

number of magnetic field lines, that is, the more magnetic field lines across a unit area, the stronger the

magnetic field. The number of lines of magnetic force passing through the inside of the coil is called the magnetic

flux, so the larger the magnetic field, the larger the magnetic flux. This magnetic field is still generated by electric current alone.

SK827005 SK827100-AS Place an iron core inside the coil, as shown in Figure 1-3. An iron core is a

ferromagnetic material that can be magnetized by the surrounding magnetic field. The energized coil

generates a magnetic field, which magnetizes the core, causing it to generate an additional magnetic field.

SK827005 SK827100-AS refers to the proportional coefficient of coil flux and current as inductance,

which is represented by the symbol “L” and the unit is Henry [H], which is the origin of inductance. As shown

in Figure 1-5 below, inductance, also known as self-inductance coefficient, represents the property of

magnetic field generated by the coil. The magnetic field has energy, so the inductance also reflects the physical

phenomenon that the coil stores magnetic field energy. Inductance is a parameter that represents the

component characteristics of the coil on the one hand and the coil on the other hand. That is to say, when we say “inductance”,

we can refer to the inductance parameter or the inductance component.

SK827005 SK827100-AS Draws a line based on the relationship between the current and the flux of the

inductor, as shown in Figure 1-5. This line is the characteristic curve of the inductor, similar to the volt-ampere

characteristic curve of the resistance component, the unit of flux is Weber, the unit of current is amperes, so the characteristic

curve of the inductor is called the Weian characteristic curve.

SK827005 SK827100-AS At this point, do you have an answer to the opening question? The answer is “Yes”. A wire,

equivalent to a coil with 1 turns, can generate a magnetic field by passing a current through it. Obviously, this magnetic

field can also be represented by inductance, but the magnetic field generated by it is often very weak and will not have an effect on the surrounding or circuit, so people ignore it.