The basic concept of electromagnetic coil, magnetic core:

Magnetic: in nature, there are some substances, such as iron, nickel,cobalt, which attract each other under certain conditions, these substances we call them with a magnetic, so they have magnetic properties, which we call the magnetization, can be magnetized or can bea magnetic substance attracting substance we call him magnetic materialor magnetic media.

The pole is divided into two levels, the Antarctic and Arctic N Srespectively.

Here I would like to know the difference between a magnetic field and electromagnetic field.

Two, the electromagnetic coil magnetic core unit

The magnetic induction intensity per unit length: conductor in uniform magnetic field strength of the magnetic field, current said by force size.

Flux: the total vertical lines through a cross section

Permeability: the electric current produces a magnetic field, the magnetic induction intensity in different medium

The strength of the magnetic field in the fixed environment: magnetic induction and magnetic permeability ratio

Three, the electromagnetic coil of electromagnetic applications

Self: flux current through the conductor, we usually call him theinductance, the inductance unit called inductance.

To coil as an example, AL=L/NN

Transformers: the principle of transformer

Four, the electromagnetic coil magnetic core material classification

1: Mn Zn ferrite nickel zinc, magnesium and zinc

2: silicon steel alloy, iron core, iron silicon aluminium, iron and nickel,amorphous and nanocrystalline

A. Mn zn:

Composition: Fe2O3 71%, MnO 20% Zn:9%

High resistivity: 10 Ohms-cm

Purpose: power transformers, EMI common mode filter, inductor

B. nickel zinc:

Composition: Fe2O3 50%, NiO 24% and Zn 26%

The resistivity of 10*7 Ohms-cm

Application: filter, inductor

C. type silicon steel:

High initial guide, about 60000

The resistivity is low, suitable for low frequency

D. iron core:

Fine iron powder and organic material bonding

Between the permeability of foundation 10~75

E. iron silicon aluminium

Composition: it is composed of iron and silicon aluminum 6% 85% 9%

Between the low permeability 26~125

F. nickel iron:

Composition: it is composed of iron and 50% nickel 50%

The cost was slightly higher than the permeability of FeSiAl sendust, loss less than

上一篇： The calculation formula of the hollow coil inductance   下一篇： Basic knowledge of electromagnetic coil wire