EMI CHOKE QUESTION
- From: "Yzordderrex" <yzordderrex@xxxxxxxxxxx>
- Date: 19 May 2005 05:33:53 -0700
I have recently been given responsibility for EMI choke design. The
company I work for makes motor controls.
I am looking at a 12amp servo drive (single phase 230v input) that will
pull about 150 amps peak on the input side when balls to the walls 300%
output.
The EMI filter choke is wound like any other single phase unit you
would see on a toroid. Winding A on one side, and winding B on the
other side of the ring. Each winding taking up about 160 degrees of
ring so that there is some voltage creepage distance.
I have wound a 10 turn tertiary winding on the core that I use to
measure inductance. I jam my 30v bench supply into the tertiary
winding an watch the rate of rise of current to measure the inductance.
When I excite the core with 150 amps not all of the flux is cancelled
so that the inductance goes to nearly zero. I'm assuming that the
filter is probably useless at the peaks of the line currents.
Would I be better off using an insulated wire and wind each coil say
330 degrees and interleave the coils - bifilar?
We have gear to measure and I will probably proceed on this path for
today. Just soliciting your thoughts.
regards,
Bob
.
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