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File /Temp/Autotransformer.zip

 

Late night modelling certainly didn’t help!

OK, replaced SQRT() with x**2

  Tap-to-tap differences and voltages are slightly better.

  18VAC winding is a bit worse, though.

  Still blows up with moderate loads.

 

I don’t yet grok the directions of current flows; will simplify to one tapped winding and one separate.

 

Thanks!

Dave

 

From: LTspice@groups.io <LTspice@groups.io> On Behalf Of John Woodgate
Sent: Thursday, December 26, 2024 12:59 PM
To: LTspice@groups.io
Subject: EXTERNAL: Re: [LTspice] File /Temp/Autotransformer.zip uploaded #file-notice

 

Inductance is proportional to turns squared, not square root. Start with a simpler winding with one tap, and look at the directions of current flow. In an autotransformer, the 'secondary' current opposes the 'primary' current.

On 2024-12-26 20:40, Group Notification wrote:

The following items have been added to the Files area of the LTspice@groups.io group.

By: Bell, Dave <Dave.Bell@...>

Description:
I need some tutorials regarding autotransformer modelling! I was intrigued by Hassan's AC Stabilizer and tried to model TR1 The model differed from my expectations in several ways. 1: Why do the tap-to-tap voltages differ? 2: Why is the separate 18V winding so different? 2a: Why is it more different when I separate the Kxxx directives? 3: Why do the outputs throw infinities with megohm loads, but not when open??

-- 
OOO - Own Opinions Only
Best Wishes
John Woodgate
Keep trying

 

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