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Registered Member #1470
Joined: Tue May 06 2008, 01:00AM
Location:
Posts: 2
Hi, could anyone tell me if it is absolutely necessary to ground the core leads of a mot stack?Will it hurt performance if I simply tie them together? I seem to remember someone somewhere stating that to not do so would subject the secondaries to more stress than necessary.I ask because I've recently potted two in wax for use as charging inductors and really dont want to have to dig the secondaries out to fix the situation.Just wondering.
Registered Member #1370
Joined: Mon Mar 03 2008, 09:01AM
Location: Finland
Posts: 56
Two and perhaps three mots can be used without secondary-side grounding. I have ran dual pack without grounding (and with SRSG running directly across them...). Adding more mots causes additional electrical stress, and you may place mots in the stack by them appearance (what sees to have better insulations, goes to higher voltage level). By grounding two middle mot cores, you balance the whole stack so that at second level there is certainly that 2kV of primary-core-stress. Else the most stress might be where ever, and flash breakdown can be present in the weakest mot.
Registered Member #1470
Joined: Tue May 06 2008, 01:00AM
Location:
Posts: 2
Yeah, I'd simply be using a two stack.Like I said, I'm trying to salvage a power supply from what was originally going to be my charging inductor on a dc coil.Problem is I toasted the first psu stack and was scared it may have been totally because I hadn't grounded the secondary.Thanks for your help!
Registered Member #1408
Joined: Fri Mar 21 2008, 03:49PM
Location: Oracle, AZ
Posts: 679
I don't want to beat a dead horse but one thing puzzles me; don't MOT's run at 60hz? If so how is the higher frequency achieved? I recently ran into a very large number of MO caps but was disappointed to find out that there was no way to run them in a TC as they are 60hz. So if a MOT is 60hz what mechanism is achieving the high frequency and could this concept be applied to a 60hz cap(s)???
I'm asking this rhetorically as I think there are other limitations with a microwave cap but I wish there was something I could do with these guys aside from crush cans.
Registered Member #396
Joined: Wed Apr 19 2006, 12:55AM
Location: Pittsburgh, PA
Posts: 176
quicksilver wrote ...
I don't want to beat a dead horse but one thing puzzles me; don't MOT's run at 60hz? If so how is the higher frequency achieved? I recently ran into a very large number of MO caps but was disappointed to find out that there was no way to run them in a TC as they are 60hz. So if a MOT is 60hz what mechanism is achieving the high frequency and could this concept be applied to a 60hz cap(s)???
I'm asking this rhetorically as I think there are other limitations with a microwave cap but I wish there was something I could do with these guys aside from crush cans.
What do you mean? MOTs are 60hz and are (as far as I know) always driven at 60hz. The high frequency is only for tesla coil use and is developed in the LC-spark gap circuit after the MOT. Read up on TC theory and things will make sense.
MO caps aren't good for tesla coil use and there really isn't much to do about that. Use them like you said in a bank for can crushing, or set up a resonant MOT bank (there is an active thread about this right now).
Registered Member #1107
Joined: Thu Nov 08 2007, 10:09PM
Location:
Posts: 792
guys just as a reminder this thread is getting a little off topic so if you want to continue the topic than you should start a thread relating what to do with mot caps.
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mot stacks
