Why use inverter and not correct ac source to ac drive directly?

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Eatmealive
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Hi all, I have a question with regards to why should we use an ac-dc, dc -dc, dc-ac converter to an ac drive? Why not connect an ac source through a transformer directly to the ac drive? Isn't it the same? What equations can prove that the use of converter is a better choice?
 
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Welcome to PF!

Are you talking about a variable frequency drive? They are used so you can vary the speed of an AC motor. Otherwise they are typically connected "across the line'.