Role of power inductor in train applications

[billybomb87]

I have a circuit-diagram for a train which in the final stages converts the power to a 3-phase AC voltage (IGBT) that is the excitation for the motors in the train. However, right before the converter module there is a power inductor. I have looked through some literature and on the internet but nowhere does it say explicitly what the role of the power inductor is.

If there is anyone who can explain this in a very simple way or recommend a book or site that explains this, that would be much appreciated.

Regards
B

 

[Windadct]

Can't really say without a schematic - but most likely for filtering, the IGBTs switching causes high frequencies that are not good for the motor.