one: English magnetic induction line: Magnetic Induction Iine
Two: definition: the magnetic lines of force is called the magnetic induction line, is used to visually describe some curves of magnetic field distribution. People will be defined as everywhere tangent lines of magnetic force and magnetic induction intensity line direction, the direction of the magnetic induction strength and magnetic field lines the same, its size and the magnetic lines of force density is proportional to the magnetic field lines: drawing some curves in the magnetic field, the curve of any point on the tangent direction with the direction of the magnetic field of this point are the same, these curves are called magnetic lines of force the magnetic lines of force, is a closed curve. The provisions of the small magnetic needle Arctic refers to the direction to the direction of magnetic field lines. The magnet around the magnetic field lines are from the N pole out into the S pole, S pole magnetic field lines in the magnet from the internal to the N pole.
Three: people will be defined as everywhere tangent field lines and magnetic induction intensity line direction, the direction of the magnetic induction strength and magnetic field lines the same, and its size is proportional to the density of magnetic field lines. To understand the basic characteristics of the magnetic lines of force is to master and analyze the magnetic circuit foundation.
Four: lines have basic characteristics of the following: 1 the magnetic lines of force is always from the N pole starting, enter the S pole and the nearest, and forms a closed loop. This phenomenon in electromagnetics known as flux continuity theorem, described by the Maxwell equation: V.B=0?? (4-1) type is also called Gauss law for the magnetic field, divergence represents arbitrary magnetic field is 0, i.e., the net magnetic flux through any closed surface is always 0, always closed magnetic field lines. 2 with the current similar, the magnetic lines of force always walk the minimum reluctance (permeability max) path, therefore the magnetic field lines are usually straight line or curve does not exist in a right angled bend lines. 3 any two same direction magnetic field lines between mutually exclusive, so there is no intersecting lines. 4 when the ferromagnetic material is not saturated, polar magnetic line of force is always perpendicular to the ferromagnetic material. When the ferromagnetic material is saturated, the magnetic field lines in the ferromagnetic materials behavior and in the non ferromagnetic medium (such as air, aluminum, copper) in the same.
Five: since the lines of force has the basic characteristics of this, so the magnetization state of the medium depend on the medium of magnetic properties and geometry. Clearly, in general, medium in non uniform magnetization, that is usually medium inside the magnetic lines into the curve of state and uneven distribution; in addition, due to the nature is the existence of electrical insulators, but there is no magnetic insulator, so there are usually magnetic circuit of magnetic flux leakage. Medium in a nonuniform magnetization and magnetic circuit are the two features of magnetic flux leakage, determines the accurate calculation of the magnetic circuit is very complex. |
