MCSA : MOTOR CURRENT SIGNATURE ANALYSIS
                     INDUCTION MOTOR DRIVES
    • DIAGNOSE PROBLEMS PRIOR TO MOTOR 
       DRIVE FAILURE
    •  BROKEN ROTOR BARS
    •  ABNORMAL AIRGAP ECCENTRICITY
    •  SHORTED TURNS IN LV STATORS
    •  ABNORMAL ROTOR DYNAMICS
    •  PUMP WEAR
    •  MISALIGNMENT
    © William T. Thomson   EM Diagnostics Ltd   2001 - unauthorised copying, reproduction or 
    amendment of all or part prohibited                                       2
     INDUCTION MOTOR DRIVE SYSTEMS
   • WHY SO IMPORTANT?
     – USA  800,000 MW GENERATING CAPACITY
     – 40-50% CONSUMED BY INDUCTION MOTORS
     – 320,000MW PLANT SYSTEMS
     – 328 MILLION HORSEPOWER
                                                3
        Power         Pulp &           Shipping
       Utilities      Paper                          Nuclear
                                        MOD
    Oil & Gas              Uptime of                  Wind
                        Induction Motor              Power
                         Drive Systems
     Chemical                                       DuPont
     Refineries                                     Kodak
                     Mining         Transport        Ford
                                                          4
    8 CW Induction          8 PA Induction         8 ID Induction 
     Motor Drives            Motor Drives          Motor Drives
    26 Mill Motors      2000 MW Coal                  Numerous 
   Induction Motor             Fired                    other 
        Drives                                        Induction 
                         Power Station              Motor Drives
   8 Coal Conveyor                                 8 Compressor 
   Induction Motor           8 FD Induction       Induction Motor 
        Drives               Motor Drives             Drives
                                                              5
                                                 3 PHASE, SCIM, 6.6kV, 
                                                 2800kW/3753H.P., 2-POLE, 
                                                 3570r.p.m., 60Hz, 
                                                 (Full-load slip = 0.00833 or 
                                                 0.833%)
                                                                    6
    © William T. Thomson   EM Diagnostics Ltd   2001 - unauthorised 
    copying, reproduction or amendment of all or part prohibited