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08 August 2016

TTM-04: The relationship of system efficiency and speed control using VSDs vs. EC motors

In an effort to reduce energy consumption, variable airflow is utilised in many HVAC&R applications. This can be achieved in different ways. This technical article investigates the use of induction motors with Variable Frequency Variable Voltage (VVVF) drives, also called Variable Speed Drives (VSDs) and EC direct-drive motors. Significant energy savings can be achieved in a variable torque application such as fans and pumps utilising affinity laws (power laws).

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Caroline Bommes
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