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picture1_Motor Ppt 83120 | Induction Motor


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File: Motor Ppt 83120 | Induction Motor
induction motor comparing with synchronous motor no dc field current is required to run the machine instead amortisseur windings are installed in the rotor the machine is called induction because ...

icon picture PPT Filetype Power Point PPT | Posted on 11 Sep 2022 | 3 years ago
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                    Induction Motor
      • Comparing with synchronous motor No dc field 
         current is required to run the machine.
      • Instead, amortisseur windings are installed in the 
         rotor. 
      • The machine is called “Induction” because the 
         rotor voltage is induced in the rotor windings 
         rather than physically connected by wires.
      • It is possible to use an induction machine as motor 
         or generator, but there are many disadvantages to 
         use it as generator.    
                                                            2
       Induction Motor Components  
   1) Stator: Consisting of a steel frame 
      that supports a hollow, cylindrical 
      core of stacked laminations. Slots on 
      the internal circumference of the 
      stator house the stator winding
   2) Rotor: There are two different types 
      of induction motor rotor:
      Squirrel cage rotor (Cage rotor):
      Consists of series of conducting 
      bars laid into slots carved in the 
      face of rotor and shorted at either 
      end by large shorting rings.
                                                               3
     Wound rotor IM
      •A wound rotor has a 3-phase 
      winding, similar to the stator 
      winding.
      •The rotor winding terminals are 
      connected to three slip rings 
      which turn with the rotor. The slip 
      rings/brushes allow external 
      resistors to be connected in series 
      with the winding.
      •The external resistors are mainly 
      used during start-up under normal 
      running conditions the windings 
      short circuited externally.
                                                               4
                                                5
              Induction  Motors Operation 
                            Principle
      1)   The three-phase stator is supplied by balanced 
           three-phase voltage that drives an AC 
           magnetizing current through each phase 
           winding.
      2)   The magnetizing current in each phase 
           generates a pulsating AC flux.  
      3)   The total flux in the machine is the sum of the 
           three fluxes.
      4)   The summation of the three AC fluxes results 
           in a rotating flux, which turns with constant 
           speed and has constant amplitude. 
                                                             6
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...Induction motor comparing with synchronous no dc field current is required to run the machine instead amortisseur windings are installed in rotor called because voltage induced rather than physically connected by wires it possible use an as or generator but there many disadvantages components stator consisting of a steel frame that supports hollow cylindrical core stacked laminations slots on internal circumference house winding two different types squirrel cage consists series conducting bars laid into carved face and shorted at either end large shorting rings wound im has phase similar terminals three slip which turn brushes allow external resistors be mainly used during start up under normal running conditions short circuited externally motors operation principle supplied balanced drives ac magnetizing through each generates pulsating flux total sum fluxes summation results rotating turns constant speed amplitude...

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