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From: Chris M
Subject: Re: Strange behaviour - core saturation puzzle
Date: Thu, 16 Jan 2003 13:47:11 -0700
Organization: National Semiconductor, Santa Clara
NNTP-Posting-Date: Thu, 16 Jan 2003 20:48:11 +0000 (UTC)
X-Mailer: Mozilla 4.78 [en] (X11; U; SunOS 5.8 sun4u)
WHy is one side of the coil shorted?????
You really need to keep it open or use the entire winding...
The type of test your running needs to have a DC current source in series
with a AC voltage source...
This way you can measure the inductance with the AC at DC current
As for why the your sat level moves down with increasing
frequency...this is because the BH loop is not constant for all
frequencies.....the BH loop will have more headrrom at the lower
frequency.....the flux density will be the same , of course, but the
lower frequency loop will sat a bit later...
Also the core will have a Volt-Second (time constant) to a step
function..this will be a first quadrant pulse permeability loop....
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