Re: [TCML] MOT stacks

[jhowson4@xxxxxxxxxxx]

Thanks for the suggestion. 
I have access to 240V but I do not have access to a variac that can handle it. So I will just run each off a slightly diminished 120 as I have several variacs that can handle 50+ amps at 120. 

I guess I will test each mot tomorrow, anyone have any ideas on how I could test the inductance of the secondaries? 
I would run 0-120 into the secondary and then measure and graph the current voltage relation to extract the total impedance . primary shorted. 
Am i guessing correctly on how to do this. 

I am guessing that knowing much about the primary coil is not all that necessary, as its the secondaries that should be matched inductance/voltage wise as well as the total power capability of each. 



Thanks, 
John "Jay" Howson IV 


"Why thank you, I will be happy to take those electrons off you hands." 

----- Original Message -----
From: "Jon Danniken" <danniken@xxxxx> 
To: "Tesla Coil Mailing List" <tesla@xxxxxxxxxx> 
Sent: Monday, December 26, 2011 10:40:10 PM 
Subject: Re: [TCML] MOT stacks 

jhowson4@xxxxxxxxxxx wrote: 
> Alright so it looks like its a good idea to match them somewhat, but 
> not necessary for series operation. 
> But necessary for parallel operation. 
> I was planning on removing the shunts and ballasting it. 
> 
> 
> I was wanting to parallel them for future expansion. I am planning on 
> working my way up the power level ladder. So I can at least do some 
> testing of my system while I search for a higher voltage capacitor 
> allowing me to utilize my potential transformer. 

What I have noticed in paralleling MOTs is that it is the primary 
current/voltage which is the critical factor to match, especially if you are 
parallelilng three of them (at 240VAC as is available in the US) in order to 
run each one at 2/3 rated voltage so that they are not oversaturated. The 
only way to to this realistically is to short the secondaries and put a 
meter on each primary, due to the unpredictable nature of MOTs running close 
to saturation. 

Perhaps another method would be to individually test each MOT by shorting 
the secondary and measuring the primary current at the 2/3 line voltage. 

Jon 

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