Overview
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The AL-value indicating the inductance for the number of turns of a coil
is one of the vital parameters when designing a transformer or choke coil.
Analyzing the current characteristics for the AL-value using a simulation
is advantageous because the AL-value is often set by the design specifications
and the AL-value varies with the input current.
This example presents the use of a magnetic field analysis to obtain the
AL-value current characteristics of a choke coil. |
Magnetic Flux Density, Flux Linkage, and AL-value
The current density distribution of the core for a current of 0.5 A and
0.7 A is indicated in Fig.1, the current characteristics of the flux linkage
are indicated in Fig.2, and the current characteristics of the AL-value
are indicated in Fig.3.
If the current flowing in the coil increases, the flux linkage increases
minimally because of magnetic saturation in the core. Furthermore, the
AL-value is reduced by the magnetic saturation in areas the current is
large because the AL-value is the inductance for the number of turns in
the coil. |
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