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U.S. Department of Energy
Office of Scientific and Technical Information

Adjustable Speed Drive Part-Load Efficiency - Motor Tip Sheet #11

Program Document ·
OSTI ID:1216458
An adjustable speed drive (ASD) is a device that controls the rotational speed of motor-driven equipment. Variable frequency drives (VFDs), the most common type of ASDs, efficiently meet varying process requirements by adjusting the frequency and voltage of the power supplied to an AC motor to enable it to operate over a wide speed range. External sensors monitor flow, liquid levels, or pressure and then transmit a signal to a controller that adjusts the frequency and speed to match process requirements.
Research Organization:
EERE Publication and Product Library
Sponsoring Organization:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Advanced Manufacturing Office (EE-5A) (Advanced Manufacturing Office Corporate)
OSTI ID:
1216458
Country of Publication:
United States
Language:
English

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