Autotransformer Design??

Dear Reader,
First of all let me thank you for taking interest
in lending a helping hand for my issue.

The issue is that i ve to design one autotransformer with secondary
tapped from the primary and is kept at a voltage equal to 106V. The
primary has 7 taps ranging from 0 Volts to 187V in steps of 110% of
rated voltage which is 110V. so the taps will be
121,132,143,154,165,176 and 187V tap. the load on the secondary will be
around 2.1K.

i ve used the formula V2/V1=N2/N1=I1/I2, Where V-Voltage, N-No of
turns, I-Current. The secondary load current is 43mA. N2 is currently
3600 which is fixed. Since V2 is needed to be 106V, V1 is 121V for
first tap. so from the above expression I1 can be found, and then N1
can be found. this is repeated for remaining taps. This is how i ve
done the designing. Is this OK or any other method has to be adopted.

Please help me.

Thanking You

Regards
Pavan

Pavan,
Is this an acedemic exercise or is there a practical end use?
Joe


"pavan" <[Only registered users see links. ]> wrote in message
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Dr. Video,
How ever You want you can take it but there is really an
importance behind me asking this question. Rather frankly it has an end
use. i am working on this.

Regards
Pavan
Dr.Video wrote:

I am unclear on whether or not you're actually buiding one from scratch or
are utilizing an existing one. If you simply need to step down from 121 to
106 VAC, you can do this with a number of off the shelf transfomers that
have a 120v pri & a 12-15 v sec. Simply wire the sec to buck the pri, you
create an autotransformer that will step down to your specs.


"pavan" <[Only registered users see links. ]> wrote in message
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be