Over the last 20 years, variable-frequency drives (VFDs) have become the dominant form of motor control in the HVAC industry. Tremendous energy savings and more-precise control sit atop a long list of benefits that have propelled VFDs to industry-standard status. With this rise in popularity, however, has come increased concern regarding the relationship between VFDs and the electric motors they control. VFD Basics Understanding the complex relationship between VFD and motor requires a ...
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