Re: [TCML] MOT Measurements

[Finn Hammer <f-h@xxxx>]

I have been loosely following this thread, and would like to offer my 2 
cents:

Ted, I think you are on the right track.

Most of the secondary inductance is coupled to the primary inductance, 
and therefore kept under stiff control by connection the low Z mains .
What needs to be measured is the leakage inductance referred to the 
secondary side.
This leakage inductance is "free on the market" to swing with whatever 
capacitance available to it.

Like I said, my 2 cents.

Cheers, Finn Hammer

tesla skrev:
> Hi Again all
>
> Did measurements and advise.
>
> Single 600 Watt MOT, magnetic shunts in:
>
> With primary sided shorted (replicates low source Z mains) 200v rms of
> secondary excitation causes 100mA to flow.
>
> The modulus of the impedance is therefore 2000 ohms. As the resistive
> component is small compared to this the modulus is almost the same as the
> Inductive reactance. So from 2pifL=Z L is 6.3Hy
>
> What are the measurement conditions used to give results as high as 40Hy ??
>
> I believe my technique is validly measuring the series output inductance of
> an operating MOT as an external voltage generator can replace the one
> provided when the Xfrmr is operating. Have I missed something in my thinking
> ??. I will try the same measurement with an AC excitation of about 1kv to
> bring the xfrmr closer to normal operating conditions but I expect this will
> lower further the Xl value as saturation impacts
> Ta
> Ted
>
>
>   

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