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

AI Thread Summary
Using an inverter with an AC drive allows for variable speed control of AC motors, which is not possible with a direct AC source connection. Directly connecting an AC source through a transformer does not provide the flexibility or efficiency that converters offer. Converters enable the adjustment of voltage and frequency, optimizing motor performance and energy consumption. This approach can lead to better system reliability and reduced wear on equipment. Overall, utilizing converters is a more effective solution for controlling AC drives.
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'.
 

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