Re: AC coil resistance equation

• To: tesla-at-pupman-dot-com
• Subject: Re: AC coil resistance equation
• From: "John H. Couture" <couturejh-at-worldnet.att-dot-net> (by way of Terry Fritz <terryf-at-verinet-dot-com>)
• Date: Sat, 29 Aug 1998 23:48:37 -0600
• Approved: terryf-at-verinet-dot-com

  James, Bert, All -

  Calculating AC resistance is complex because of the many variables
involved. Engineering texts usually show graphs that have been obtained
from empirical data. One of these graphs is shown in my TC Design Manual.
The equation is

  Rac = Y Rdc   
  X = sqrt(cm x khz)/24.9   Y from X/Y graph
  Rdc = DC resistance

  An example is shown in the Notebook. This is not the same R as in the
equation
   Q = 6.283 F L/Reff

  John Couture

----------------------------------- 

At 10:37 PM 8/28/98 -0600, you wrote:
>Original Poster: "James" <elgersmad-at-email.msn-dot-com> 

>You are so right.
>
>-----Original Message-----
>From: Tesla List <tesla-at-pupman-dot-com>
>To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
>Date: Friday, August 28, 1998 7:25 PM
>Subject: Re: AC coil resistance equation
>
>
>>Original Poster: Bert Hickman <bert.hickman-at-aquila-dot-com>
>>
>>James and all,
>>
>>Calculating Rac ahead of time is not trivial, since there are many
>>effects at work that can make the AC resistance of a coil markedly
>>different than the DC resistance. 

-------------------    big snip

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