Hi. Why not use one of those thermo cameras? You can see hot spots and maybe
losses?
de Hans
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>Från: "Tom Rauch" <w8ji@contesting.com>
>Till: amps@contesting.com
>Ämne: RE: [AMPS] rollers
>Datum: fre 3 mar 2000 14.04
>
>
>> >Air.
>> >
>> How?
>
>It flows in from the space around the coil and the coil core because
>the coil is suspended between thin support rails. It's amazing new
>technology, similar to that used in air insulated transmission lines
>and air variable capacitors.
>
>> >The actual problem is the wire gauge and resistivity, and the fact
>> >there is little air circulated across the roller winding, which heats
>> >primarily from I^2 R losses. As little as 50 watts of heat can ruin an
>> >OEP roller. Replace it with a ceramic core roller, and the same
>> >dissipation rises to over 125 watts.
>>
>> How do you measure disipation in the inductor?
>
>A thermometer. There is a direct relationship between temperature
>rise and power dissipation.
>
>
>73, Tom W8JI
>w8ji@contesting.com
>
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