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VFD The Energy Saver

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VFD / VSD (Variable Frequency Drive or Speed Drive) Introduction : VFD are used to control motor speed to get the desired output . Motors running at constant speed generate full flow of air , but to reduce the flow we are using dampers , we are using full energy of motor and using low output air flow this causes waste of energy , so we use Vfd for air flow control . VFD are alternate for dampers , valves , etc  Energy Savings by using VFD is (30- 70 % )  . Applications : Pumps, Fans, Compressors, Elevators , Cranes , HVAC systems, conveyors Advantages :  Smooth & Controlled Start Stop . Minimize Inrush Currents . Regulate Speed or Torque  Energy saving ( power Consumption is less). VFD Parts : Rectifier, DC chokes , Snubber Capacitor , IGBT . Working : When a 3 phase Ac supply given to VFD is Rectified by SCR to Pulsating dc , Ripples in dc is reduced using filters ( choke + capacitor ) , Pure dc obtained after fi...