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Sample problems 

Example by Ing. Jan Ruzicka

Coil B: Coil with ferromagnetic core

DC current is applied to the electric coil with ferromagnetic core.

Problem Type:
Axisymmetric problem of DC magnetics.

Geometry:

All dimensions are in millimeters.

Given:
Relative permeability of the air and winding μ = 1;
Number of turns w = 400;
Applied current in wire I = 2 A;
B–H curve for the steel core:

B (T)	0.2	0.6	1.0	1.2	1.4	1.6	1.7
H (A/m)	70	150	300	450	920	3000	5000

Problem: 1. Obtain the magnetic field in coil and air.
2. Get chart Flux Density along the rotational axis of the coil

Solution:

Define a spherical region solution. Radius of R = 2000 mm.
In the block core values put the B-H. In the block coil enter the total coil current 800 A. For point 2. task draw a line from the center of cores to the right end of the axis z.

Results:

Magnetic field distribution:

Flux density in the core:

Download simulation files.