Problems solving in electrical engineering (Theoretical Foundations of Electrical Engineering), circuit analysis (Foundations of Circuit Analysis) and electronics
Main page|| Examples|| Order the problems solution|| Prices|| Guarantees||Cooperation||Contact information
Theoretical foundations of electrical engineering

Calculation of the magnetic circuit, Weber-Ampere characteristics

Given
W1=400;
W2=500;
W3=1000;
Steel: E11;
l=24 cm;
S=8 cm2;
F1=2000 A;
F2=1000 A;
F3=0 A;
δ3=1 mm;
δ12=0 mm;
l1=1,5l;
l2=l;
l3=2l;
S1=S3=S;
S2=1,5S.

Find
Magnetic flux in branches: Φ1, Φ2, Φ3 — ?

Solution

Calculation of the magnetic circuit

We set the value of the magnetic inductance 0,5 T in the second branch. Then:


According to the magnetizing curve:
H=H2=f(Φ2)=1,7 A/cm;
Field intensity in the air gap:


Magnetic voltages on the resistances gap:


According to the second Kirchhoff's law for magnetic circuits we write down the system of equations and solve it:


We make the same actions for other values of the magnetic inductance (the calculation is computerized in Excel)
Calculation of the magnetic circuit

According to the specified table of values we make Weber-Ampere characteristics of the circuit:
Weber-Ampere characteristics of the  magnetic circuit

The diagram shows that fluxes are equal:


Ответ:


Problems solving in electrical engineering online
Copyright © 2012-2016 ei-help.com. All rights reserved.