Cylindrical magnetic device (actuator)
QuickField simulation example
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 in the winding N = 1000;
Current i = 5 A;
Plunger position g = 5 mm.
The core and plunger material is steel with a nonlinear dependence B(H):
Task
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
| QuickField | Reference* | |
|---|---|---|
| B, T | 1.094 | 1.097 |
| L, Hn | 0.509 | 0.524 |
| F, N | 865 | 881.5 |
* Reference: Nicola Bianchi, Electrical Machine Analysis Using Finite Elements, ISBN 0849333997, page 89.
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