Overview
                       Overview
      Variable Frequency drives (VFD)
      Variable Frequency drives (VFD)
      Application of VFDs
      Application of VFDs
      Power quality issues
      Power quality issues
      Human Machine Interface (HMI)
      Human Machine Interface (HMI)
                               
                               
           Standards organizations
           Standards organizations
      NEMA
      NEMA
      IEEE
      IEEE
      IEC
      IEC
                               
                               
                         NEMA
                         NEMA
      Enclosures
      Enclosures
      Motor characteristic curves
      Motor characteristic curves
                               
                               
          History of adjustable speed 
           History of adjustable speed 
                        systems
                         systems
      Variable pitch pulley
      Variable pitch pulley
      Motor-Generator (MG) set
      Motor-Generator (MG) set
      Eddy current clutch
      Eddy current clutch
      Solid state drives
      Solid state drives
                               
                               
                       Problems
                       Problems
      Expensive
      Expensive
      Electrical (utility) issues
      Electrical (utility) issues
      Motor wear/tear
      Motor wear/tear