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?
Disadvantage: Motor Heating • VFD’s used to run constant torque loads (conveyor belts) at slow speeds have potential for overheating. – At low speed, the fan on the motor produces less cooling air. • Constant torque requirements with reduced cooling air results in motor heating. VFD Slow Speed/Heating Options •Increase cooling air flow
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