RC Filter or LC ??????? 1

[ozmongoose]

Hello
WE are designing a converter to control a induction machine. The converter uses the IGBTs (8KHz) to create the AC current. We know that a filter at the output of converter is necessary. But I can know if I should take a RC filter or a LC filter. Can anyone tell me how and when we chose one of those???

Thanks

 

[Skogsgurra]

The RC is out of question due to power losses. It then depends on a lot of factors if you shall run without any motor filter at all, a du/dt filter or a full sine filter. Search

http://www and

the ABB, AB and Siemens sites. Lots of information there.

 

[jbartos]

Suggestion: Visit

http://www.transcoil.com

for appropriate filters/reactors
The converter output filtering can get complicated and it is very important to be correct for the motor and for the ground and air environments in terms of EMI emissions and ground leaking (stray) currents.

 

[ozmosis]

You might want to check out the Schaffner website on

http://www.schaffner.com

At Siemens we have been using their filter technology (both for EMI and dv/dt & sinusoidal output) for a number of years and had excellent support and technical backup.
There's a lot of useful info on their site.

 

[Skogsgurra]

sed2

Frauenauracherstrasse?

 

[ozmosis]

skogsgurra
Congleton for a while, looking after the MM436(SED2) inception with (S) Building Technologies. Now with SBT as Prd.Mgr in Asia Pacific spreading the gospel of Low Harmonic Technology with the SED2!

 

[Skogsgurra]

What abt SiC?

 

[jbartos]

Suggestion to the previous posting: SiC may stand for Silicon Carbide. Visit

http://www.grc.nasa.gov/

http://WWW/SiC/SiC.html

etc. for more info

 

[ozmosis]

Silicon Carbide transistors? not just yet. Maybe in a few years but the technology for mass produced devices is still in the early stages.

 

[Skogsgurra]

So, they are on their way? Interesting to know.