Overview
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A choke coil is an electronic component use to prevent currents that exceed
the predetermined frequency. Measures to evaluate the heat source as well
as the core iron losses that occur within the choke coil and the copper
losses of the coil that decrease efficiency need to be used for this analysis.
The iron loss of the core can be obtained from the copper loss and iron
loss of the coil obtained with a mangetic field analysis in JMAG-Designer.
The example presents the use of a copper and iron loss analysis to obtain
the copper and iron losses of a choke coil. |
Iron Loss Density Distribution
The iron loss density distribution is indicated in Fig.1, the Joule loss
density distribution in Fig.2, and the hysteresis loss density distribution
in Fig.3.
The iron losses are higher on the inside corners of the choke coil as indicated
in Fig.1. This is caused by the flow of magnet flux concentrating on the
shortest path through the magnetic circuit. The hysteresis losses are the
largest contributor to the iron losses as indicated in Fig.2 and Fig.3. |
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Copper Loss Density Distribution
| The Joule loss density distribution of the coil is indicated in Fig. 4.
The Joule losses are larger around the gap as indicated in this figure.
These Joule losses are produced by the leakage flux from the gap that causes
the current distribution in the wires to be uneven. |
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Ratio of Loss
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The ratio of the losses is indicated in Table 1. As the table indicates,
the hysteresis losses of the core dominate the losses of the choke coil.
The coil has areas of iron loss density that are locally dominated. The
heat generation density of the coil can be reduced by considering the gap
width and coil arrangement to eliminate these problems in the thermal design. |
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