Transcription of Variable Frequency Drives (VFD’s)
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Variable Frequency Drives (VFD’s)
1 Understanding & Managing Variable Frequency DrivesPresented by: Greg Stark, 10, 2014 Sponsored by: Variable Frequency Drives (VFD s) Popular speed control devices used in industrial, commercial and residential applications . Huge energy savings potential operating centrifugal fans, pumps and compressors Vary Frequency of electrical supply to an induction motor to vary the motor speed. Vary the speed/flow of the applications Industrial Fans, Pumps, Compressors Conveying Systems Commercial HVAC Compressors Pumps and Air Handlers Residential Variable Speed HVAC equipment Energy Efficient Washing MachinesHow Have We Varied Speed Historically? Change Speed Belts & pulleys Chains & sprockets Gear Drives Multi-speed motors Vary Speed Variable pitch belts & pulleys Eddy current clutch Hydrostatic Drives Wound rotor motor DC Drives AC Variable Frequency Drives3 How Have We Varied Flow Historically? Size motor/system for maximum flow Use throttling devices on fans, pumps & compressors to reduce flow rates Valves Vanes & Dampers01000200030004000500060001 2 3 4 5 6 7 8 9 10 11 12 CFMT ypical Airflow Requirements MinAvgMaxMonthConsiderations?
Drive applications •Some movement to use of newer AC Flux Vector Drives •The only justification for installation of an VFD would be based on improvement in the process control of the operation. ... • Issues: – Cost of VFD vs Phase Converter – Drive is 95% efficient
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