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Synchronous machine Mitesh Kumar

Synchronous machine Mitesh Kumar

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Synchronous machine Mitesh Kumar

  1. 1. HALDIA INSTITUTE OF TECHNOLOGY SYNCHRONOUS MACHINE BY:-Mitesh kumar Roll no. :- 13/EI/26 Univesity Roll no. :- 10300513026 Applied Electronics & Instrumentation Engg.
  2. 2. Introduction •A synchronous machine is a most important type of electric machine. •Synchronous Machine used at generating stations are known as Synchronous Generators or Alternators •Synchronous motors are widely used in Industries and are well known for their const. speed operation •Electromechanical energy conversion occurs whenever a change in flux is associated with mechanical motion
  3. 3. Construction of Synchronous Machine It consists of:  Stator  Rotor  Field Windings (On rotor)  Armature Windings (On Stator)
  4. 4. Diagram
  5. 5.  It is a stationary member  It is the cylindrical portion inside which the rotor rotates  An air gap is provided between the stator and the rotor  Armature winding are 3 phased and are housed in the slots cut in the stator  It consists of cast iron stator frame, a cylindrical laminated , a cylindrical laminated and uniformly slotted core
  6. 6.  Rotor is the rotating part of the machine  Can be classified as: (a) Cylindrical Rotor and (b) Salient Pole rotor  Large salient-pole rotors are made of laminated poles retaining the winding under the pole head.
  7. 7.  Armature windings connected are 3-phase and are either star or delta connected  The windings are 120 degrees apart and normally use distributed windings
  8. 8. The 3-phase armature winding is distributed in the slots along the armature air gap periphery For example: Consider that we have 18 slots, 2-pole 3-phase winding.. Hence we have 9 slots/per pole as shown figure
  9. 9.  The winding diagram of phase ‘a’ can be shown as:  Similarly, phase ‘b’ and phase ‘c’ are distributed in same manner
  10. 10.  The field winding of a synchronous machine is always energized with direct current  Under steady state condition, the field or exciting current is given Ir = Vf/Rf Vf = Direct voltage applied to the field winding Rf= Field winding Resistance
  11. 11. The mmf-phase graph can be drawn as:  This implies that per phase emf is getting divided in each phase.  When all the 3-phase are connected then mmf-phase graph for each phase is displaced by 120 degrees
  12. 12.  Mostly all the synchronous machines use Distributed winding  Attempt is made to use all the slots available under a pole for the winding which makes the nature of the induced e.m.f. moe sinusoidal  Consider a sync. Machine with 3-phase winding, Slots, s= 18 slots Poles=2 slots per pole, g= s/p= 9 slots/pole/phase= g/3 = 3
  13. 13. Thank you

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Synchronous machine Mitesh Kumar

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