Re: RF resistance of secondary coil

• To: tesla-at-pupman-dot-com
• Subject: Re: RF resistance of secondary coil
• From: ElectronX-at-aol-dot-com (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Sun, 22 Nov 1998 20:55:12 -0700
• Approved: terryf-at-verinet-dot-com

In a message dated 11/19/98 9:36:19 PM Pacific Daylight Time, tesla-at-pupman-dot-com
writes:


>  There are two effects at play, one is "skin-effect" whereby the current
>  is forced to flow near the surface of the wire, there are formulae for
>  this, the simplest I know is;
>  
>  sd=66/SQRT(Freq in Hz) mm
>  
>  which is about 0.12mm -at- 300 kHz.

Sulaiman,
Would you please give definitions of the varaibles and units used?

Matt Behrend

<<<< 
sd == Skin Depth - The depth or distance into a conductor's surface were
the current drops to 1/e or 36.8% of the total value.  Within this depth,
63.2 percent of the current flows.  Thus, most of the current in a
conductor carrying AC current flows in this surface layer of the conductor.

66 == A constant dependant on the units used and the material.  Hertz,
millimeters, and copper in this case. 

SQRT == The square root function.

Freq in Hz == Frequency in Hertz.

mm == millimeters.

- Terry >>>>

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