The magnetic core of the transformer consists of insulated steel sheets. The joint of the individual parts can be manufactured in various ways. Two designs of core joint are compared.
Plane-parallel problem of DC magnetics.
Externam magnetic field flux density B = 1.9 T;
The B-H curve for the steel core:
Comapre two design of core joints.
We can use the picture of the magnetic field strength distribution to compare joint design. Zones with high field strengths indicate poor magnetic conductivity of the joint. The value of leakage magnetic flux could also indicate problematic joints.
Magnetic field distribution inside the core and the joint:
Leakage magnetic flux density 1 mm away from the core: