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Measuring autotransformer values....


Alexander

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The models seem to be using inductors as a voltage divider elements and not as any transformer where the voltage out/in is a function of turns ratio. 

I believe you have been implying turns ratio into the inductance values. 

 

This link uses inductor K  coupling factor to create autotransformer models. Some good info here! 

 

http://www.beigebag.com/case_tapped_inductor.htm

 

As for phase shift... if you write the inductor model as jwL  and use  voltage divider math Vout/Vin = jwL2/(jwL1+jwL2)  the jw cancels out so you do not have any phase change...

This makes intuitive sense as well since if use 2 identical inductors the magnitude of the voltage phasors Vout has to be half of Vin.  KVL would not work if the phases of Vin and Vout arent the same.. Am I making sense?

 

E

 

 

 

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