I am working on a project where they replaced a 3000hp DC motor with a 3000hp AC motor. They are claiming significant energy savings by going with an AC motor with VFD control. The old DC motor also had speed control. The 2 motors have very similar efficiences (95.4%-DC, 96%-AC).
Is there significant energy savings inherent in an AC motor with VFD control as compared to a DC motor with speed control?
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