Hi Alan,
>One thought I dont know the answer to.......magnetisation is
>not a linear
>effect, if you are getting heating you are into the saturation
>area......what does his non-linearity do to the signal ! It may even
Chris is using #2 material mix,i.e. iron powder toroids,not ferrite.
Iron powder is essentially not saturable because overheating will
set the flux limit long before saturation occurs,see attachment.
73
Clemens
DL4RAJ
>-----Original Message-----
>From: [email protected]
>[mailto:[email protected]] On Behalf Of Alan Melia
>Sent: Thursday, March 8, 2018 2:55 PM
>To: [email protected]
>Subject: LF: Re: Can an air cored LPF inductor have as high a
>"Q" as a toroidal wound one?
>
>Chris my take on this.....not having used this level of power
>at LF.....if
>the core is gettting hot it is not providing a particularly
>high Q !! My
>line is that LPF are best made with air cored inductors, the
>values required
>are not so high as to need ferrite. (see MRF and YXM filters)
>It does mean
>care in layout to avoid coupling between the stages. You may
>even be able
>to use a non-magnetic toroidal core! Current sensing
>transformers at Rugby
>GBR 16kHz (similar to the transformers in Jim Moritz
>scopematch) were wound
>on discs of Tufnol (SRBF)
>
>One thought I dont know the answer to.......magnetisation is
>not a linear
>effect, if you are getting heating you are into the saturation
>area......what does his non-linearity do to the signal ! It may even
>compromise the effect your are trying to obtain ......actually
>generating
>harmonics??
>
>Alan
>G3NYK
Amidon Power Considerations.pdf
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