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Re: Autotransformer deep questions!

 

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Just a couple or three observations:

1. Try and get hold of a real 2.2 KVA auto transformer and measure the resistance and inductance of its windings. To compare real and theoretical solutions. I find this very useful to have a file of transformer winding data with their rating.
2. There is no point in using a wire that can carry 10 plus amps for the 18 Volt winding where only 1 amp seems to be supplied. The winding can be several ohms of resistance with a corresponding increase in winding voltage to compensate for the copper losses. So that at a 1 amp load the voltage is 18 volts.

3. I am never happy with not multiplying the RMS voltage by 1.4142 to get the peak voltage. I get why you did it that way but¡­ Shudder.

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Have fun

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Suusi M-B

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From: [email protected] On Behalf Of MD MUBDIUL HASAN via groups.io
Sent: 28 December 2024 16:06
To: [email protected]
Subject: Re: [LTspice] Autotransformer deep questions!

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I¡¯ll update it tomorrow; getting late here.

I got answers to most of my issues, so it may be a useful stating point.

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>>>> Thank you very much, the schematics I showed must have some problem but its sure that autotransformer plays a vital role here.

I have another design which is transformer less, lets see.

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From: [email protected] <[email protected]> On Behalf Of MD MUBDIUL HASAN via groups.io
Sent: Friday, December 27, 2024 8:01 PM
To: [email protected]
Subject: EXTERNAL: Re: [LTspice] Autotransformer deep questions!

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Dave

Great job ??

I? will look at it.

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On Thursday, December 26, 2024 at 09:41:03 PM GMT+1, Bell, Dave via groups.io <dave.bell@...> wrote:

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Please see my recent upload, Autotransformer.zip

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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, with equal inductances?

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 small or megohm loads, but not when 1G or open??

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Dave


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