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Sample problems 

Cylindrical magnetic device

The cylindrical magnetic device consists of a fixed magnetic part, cylindrical magnetic plunger and a coil.

Problem Type:

Axisymmetric problem of DC magnetics.

Geometry:

Given:

Number of turns N = 1000;
Current i = 5 A;
Plunger position g = 5 mm.

Problem:

Determine the magnetic force and the inductance.

Results:

The inductance of the multiturn winding:
L = N² · Ψ / I,
where I - is an overall current: I = N·i = 1000·5 = 5000 A.

L = 1000² · 0.00025468 / 5000 = 0.509 Hn

Download simulation files.

Reference:
Nicola Bianchi, "Electrical Machine Analysis Using Finite Elements", ISBN 0849333997, page 89.