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picture1_Motor Ppt 83133 | Induction Motor   Field Oriented Control Mkm


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File: Motor Ppt 83133 | Induction Motor Field Oriented Control Mkm
outline introduction analogy to dc drive principles of field orientation control rotor flux orientation control indirect rotor flux orientation irfo direct rotor flux orientation drfo stator flux orientation control direct ...

icon picture PPT Filetype Power Point PPT | Posted on 11 Sep 2022 | 3 years ago
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                         Outline
    Introduction
    Analogy to DC Drive
    Principles of Field Orientation Control
    Rotor Flux Orientation Control
       
         Indirect Rotor Flux Orientation (IRFO)
       
         Direct Rotor Flux Orientation (DRFO)
    Stator Flux Orientation Control
       
         Direct Stator Flux Orientation (DSFO)
    References
                                                         2
                           Introduction
     
        Induction Motor (IM) drives are replacing DC drives 
       because:
        
           Induction motor is simpler, smaller in size, less maintenance
        
           Less cost
        
           Capability of faster torque response
        
           Capability of faster speed response (due to lower inertia)
     
        DC motor is superior to IM with respect to ease of control
        
           High performance with simple control 
        
           Due to decoupling component of torque and flux
                                                                         3
                               Introduction
                             Induction Motor Drive
               Scalar Control                   Vector Control or Field Orientation 
                                                              Control
  •
   Control of current/voltage/frequency      •
                                               control of magnitude and phase of 
  magnitude based on steady-state            currents and voltages based on dynamic 
  equivalent circuit model                   model
      • ignores transient conditions             • Capable of observing steady state 
                                                   & transient motor behaviour
      • for low performance drives               • for high performance drives
  •
   Simple implementation                     •
                                              Complex implementation
  •
   Inherent coupling of torque and flux      •
                                              Decoupling of torque and flux
      • Both are functions of voltage and        • similar to the DC drive
        frequency                            •
                                              Suitable for all applications previously 
  •
   Leads to sluggish response                covered by DC drives
  •
   Easily prone to instability
                                                                                 4
                     Analogy to DC Drive
   •  In the DC motor: T  = k  I
                           e      f  a                       
   •    controlled by controlling I                           f
        f                            f
   •  I  same direction as field 
       f                          f
   •  I same direction as field 
       a                          a
   •  I and  always perpendicular 
       a      f
      and decoupled
   •  Hence, T  = k  I
                e       f  a          
                   = k’ I I sin 90    a
                        f  a 
                 = k’(I x I )
                        f   a
   •  Keeping  constant, T  
                 f            e
      controlled by controlling I
                                  a
   •  I , I  ,   and   are space vectors
       a  f  a       f
                                                                           5
                  Analogy to DC Motor
                                   •  In the Induction Motor:
           s                              T  = k x 
                   a                        e       r     s
                                  r
        c’                     b’  •    produced by stator currents
                                        s 
                                   •  r produced by induced rotor 
                                      currents
                                   •  Both   and  rotates at 
                                              s       r
                                      synchronous speed  
        b                                                 s
                               c   •  Angle between   and  
                                                        s       r
                                      varies with load, and motor 
                                      speed 
                                              r
                                   •  Torque and flux are coupled.
                                                                    6
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...Outline introduction analogy to dc drive principles of field orientation control rotor flux indirect irfo direct drfo stator dsfo references induction motor im drives are replacing because is simpler smaller in size less maintenance cost capability faster torque response speed due lower inertia superior with respect ease high performance simple decoupling component and scalar vector or current voltage frequency magnitude phase based on steady state currents voltages dynamic equivalent circuit model ignores transient conditions capable observing behaviour for low implementation complex inherent coupling both functions similar the suitable all applications previously leads sluggish covered by easily prone instability t k i e f a controlled controlling same direction as always perpendicular decoupled hence sin x keeping constant space vectors s r c b produced induced rotates at synchronous angle between varies load coupled...

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