Overview
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Voltage surges can damage the components in electrical equipment such as
an inverter.
Busbar inductance can be a cause of surges. Therefore, it is important
to reduce it to protect the electrical equipment.
Using FEM allows for the calculation of inductance based on the magnetic
field and current distribution obtained from the magnetic field analysis.
This note presents a case study on the current distribution and the frequency
versus inductance characteristic of the busbar. |
Current Distribution in the Conductor
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Fig.1 shows the current distribution when applying the current from +U
phase to ?W phase.
As the frequency increases, the current concentrates at the edges of the
conductor. This is caused by the skin effect in which current flows at
the outer surface when the frequency is high. |
Inductance
| Fig.2 shows that as the frequency increases, the internal inductance decreases
due to the concentration of current on the conductor surface by the skin
effect, and consequently, the overall inductance in the conductor decreases.
On the contrary, the resistance increases with the frequency since the
path for the current narrows. |
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