From: "Terrell W. Fritz"
Date: Mon, 01 Jan 2001 13:58:16 -0700
Subject: Re: [TSSP] NSVPI - Terminated Coil Results
Hi Paul, That measurement was taken with the primary in place. Perhaps that is the problem. I remember the frequency really was 86.7kHz. I tried this with E-Tesla and got 87.5kHz. I could probably remeasure the dimensions and such, but that would only give a slight improvement in accuracy. I think we are making a basic error in what we both think the coil's dimensions or placement are. The other parameters are: Terminated Coil Ceiling Distance = 84.000000 Wall Distance = 60.000000 Primary Height (Inner Turn) = 4.250000 Primary Inner Diameter = 12.000000 Primary Outer Diameter = 26.000000 Primary Height (Outer Turn) = 4.250000 Secondary Base Height = 6.000000 Secondary Diameter = 10.250000 Secondary Length = 30.000000 Secondary Inductance (mH) = 75.400002 Terminal-1 Height (center) = 48.500000 Terminal-1 Cord Diameter = 8.000000 Terminal-1 C-C Diameter (toroid only)= 22.000000 Check these against the numbers you are using and I will check some more things here. If you are getting 95.7kHz and I am at 86.7kHz. something must be very wrong in the numbers we are using. I ran E-Tesla without the primary with the base of the coil 1 inch above the ground plane and got 87.2kHz and having the coil here and all it seems like the 95.7kHz number is way too high. Cheers, Terry Happy New Year! At 08:04 AM 1/1/2001 +0000, you wrote: >Hi, > >Terrell W. Fritz wrote: > >> The coil had an Fo frequency of 86.7kHz > >Can you check this Terry, there's no way I can get your coil >to resonate at this frequency. Predictions come out at 95.7 kHz >using 75.1mH, although I suspect we should be using 74.5 or >thereabouts in view of the ground plane effect. Perhaps the >86.7 is a typo - a 10% prediction error would be extraordinary. > > >I've rewritten the nsvpi comparison page and included the new >results, > > http://www.abelian.demon.co.uk/tssp/pn2510/ > >This will be finished if we can just resolve the f1 discrepancy >in the toroided case, which would allow a better alignment of >the toroided profile. All the other numbers agree very nicely. > >Cheers, >-- >Paul Nicholson, >Manchester, UK. >--
Maintainer Paul Nicholson, paul@abelian.demon.co.uk.