Variable frequency drive

but the inverters must have a common controller. In other words both inverters are controlled by a single system. That isn't specifically 2 separate variable frequency drives on one motor. but similar. However, to operate a single motor from 2 drives is also possible if the variable frequency drives are filtered using a sinewave filter to remove the majority of the carrier frequency.
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service VSD blog: A deep observation of automation control industry, especially in AC motor variable speed drive for industrial motor controls.

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