Man you make my drawing look... nah can't think of a word to describe how bad you make my drawings look.
I am trying to picture where the close spacing is between the capacitor tab mounting and the IGBT. The horizontal spacing on your drawing looks good so it must be the vertical spacing.
I thought as the IGBT bolt holes were raised compared to the rest of the IGBT that there would have been room for the capacitor bolt heads even if they were over the IGBT. I was expecting to have to put the bolts for the ring capacitor through the copper ring before bolting the ring down to the IGBTs but once they were in it would only be the bolt head that was below the copper ring near the IGBT. And for the IGBT it would only be their bolt heads that would be on top of the copper ring near the capacitor.
Rather than a second set of rings maybe just some simple copper spacers to give more vertical clearance?
Stand by for some more nasty drawings.
Without spacers.
With spacers.
I was thinking that the space north of centre could be used for the control circuitry. As there are IGBTs to the east, south and west but nothing north. (maybe i should do another dodgy diagram
)
If the controller circuitry could be positioned there then there would be very little space required beyond the north of the edge of the ring capacitor. That would shorten the enclosure quite a bit.
Ahhhh.... Just had another look at the photo's and the bolts for the inner tabs of the ring capacitor have a screw type head (phillips head) which would be inaccessible once the rings were bolted to the IGBTs. I had thought they were all hex headed bolts so only access for a small spanner was required.
Couldn't those screw head bolts be swapped out for some hex headed bolts?
Or i could be misunderstanding the whole issue. (much more likely)
