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4hv.org :: Forums :: Tesla Coils

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inductance of a MOT

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northern_lightning

Sat Jan 31 2009, 04:05PM

Registered Member #1348 Joined: Sun Feb 24 2008, 01:48AM
Location: Michigan's Upper Peninsula
Posts: 22

i'm looking to use a microwave oven transformer as an inductor in a DC Tesla tank. i have no meter. so can anyone tell me what the measured inductance for a small MOT (from a 400 watt oven) is?

how about a medium-sized MOT (850 watts).

how much does this nductance change (if at all) with the primary side shorted? thanks! even ballpark numbers are welcomed.

Dr. Dark Current

Sat Jan 31 2009, 04:50PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Sec. inductances
MOT1 (700W): Pri. shorted 5.3H, pri. open ~23H
MOT2 (1000W): Pri. shorted 4.1H, pri. open 18H

Note: the use of a MOT with open primary for a DC choke is not recommended (the core by itself can't store much energy and will saturate).

If higher inductance than with shorted primary is required, the "I" part of the core can be sawn off (saw off just the weld) and by varying air gap in the core, you vary the inductance.

northern_lightning

Mon Feb 02 2009, 03:10AM

Registered Member #1348 Joined: Sun Feb 24 2008, 01:48AM
Location: Michigan's Upper Peninsula
Posts: 22

thanks Dr. K! i'll be sure to post my project as soon as i get around to completing it.

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