Transcription of Synchronous Machines - IIT P
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Synchronous Machines - IIT P
Synchronous MachinesConstruction1. Stator - Armature (Same as the stator of an InductionMachine)2. Rotor - Field Winding ( DC Field)GeneratorIAs a generator, this machine is widely is the machine which is used in all conventional Synchronous generator is called as an it runs only at Synchronous speed, it is not widely usedas a motor but for certain applications like electric , it is used to either produce or absorb reactive StatorIIt is a distributed windings of each phase are distributed over several phase windings are wound 120 (electrical angle) apartin space2. RotorIIt is excited by a DC are two Cylindrical Rotor - used where the turbine speed is Salient pole Rotor - used where the turbine speed is lowSynchronous machine is a doubly excited can have field winding placed in stator and armature windingin rotor. This type is called aninverted Synchronous Generator m eB2 2 teB4 ( e)2 ( m) teIn general e=P2 mSource: A. E. Fitzgerald, , Electric Machinery tvIn a 2- pole machine , one revolution makes one cycle of a P- pole machine ,1 revolution/min 160 P2cycle/secNrpm N60 P2cycle/secf=PN120 HzThe flux linkage with stator coilais a=N fcos tWhereNis the number of turns in each pahse and fis the fluxper pole due to excitation currentIf.
let us consider a 4-pole synchronous machine. IWhen the three phase armature winding (stator) is supplied with a three phase balanced supply, It produces a rotating mmf in the air gap whose speed is the synchronous speed N s = 120f P For a 4-pole machine and 50 Hz supply, N s =1500 rpm. IWhen the eld winding (rotor) is excited by DC, it will
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