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Main >> Applications >> Sample problems >> Step lap joint

Step lap joint

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.

Problem Type:
Plane-parallel problem of DC magnetics.

Geometry:
Step lap joint Steel 12 × 0.5 mm

Given:
Externam magnetic field flux density B = 1.9 T;
The B-H curve for the steel core:

Problem:
Comapre two design of core joints.

Solution:
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.

Results:
Magnetic field distribution inside the core and the joint:

Step lap joint field strength

Leakage magnetic flux density 1 mm away from the core:

Step lap joint leakage flux

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