#Working principle of synchronous generator #Working principle of synchronous motor #Working principle of alternator #Synchronous machine kaise work karta hai A generator is a device that convert Mechanical energy into electrical energy using electromagnetic induction.  A DC generator produces direct power based on fundamental principle of Faraday's laws of electromagnetic induction.  According to this laws, Whenever a conductor is moved within a magnetic field in such a way that the conductor cuts across magnetic lines of flux, voltage is generated in the conductor. Syllabus  Introduction of Machine  Classification of Machine  Construction of DC, Induction & Synchronous machine  Working Principle of  DC Machine  Induction machine  Synchronous machine  EMF Equation of all machine  ………  A transformer works on alternating current, while a DC machine works on Direct Current  It has two main parts :  Stator – It is the stationary part. It does not move or rotate.  Rotor – It is the rotating part of the machine. YOKE  It is the outermost part of a DC motor. It is made of cast iron or cast steel.  It provides mechanical protection to the inner parts of the machine.  Provide low reluctance path for the magnetic flux. Pole core  These are made of cast steel laminations.  The main purpose is to hold the field windings .  The end portion of the pole is called pole shoe.  FIELD WINDING  They are enameled copper wires wound around the poles  When current passes through series connected windings then adjacent poles attain opposite polarity Armature core  This is the rotating part of the machine  It is a cylindrical structure with slots around its outer periphery.  It houses conductors in the slots.  It provides easy path for magnetic flux Introduction of Machine,Classification of Machine,Construction of DC, Induction & Synchronous machine,Working Principle,DC Machine,Induction machine,Synchronous machine,EMF Equation of all machine

1. ELECTRICAL MACHINE
BASIC ELECTRICAL
ENGINEERING
WORKING PRINCIPLE
WORKING
PRINCIPLE OF
SYNCHRONOUS
MACHINE
DAY 13

2. ELECTRICAL MACHINE
Syllabus
 Introduction of Machine
 Classification of Machine
 Construction of DC, Induction
& Synchronous machine
 Working Principle of
 DC Machine
 Synchronous machine
 Induction machine
 EMF Equation of all machine
 ………
DAY 9
DAY 10
DAY 11
DAY 12

3. WORKING PRINCIPLE OF SYNCHRONOUS MACHINE
SYNCHRONOUS
MACHNE
SYNCHRONOUS
GENERATOR
SYNCHRONOUS
MOTOR
SYNCHRONOUS
GENERATOR
Mechanical Energy
Electrical Energy
Torque
AC Voltage
SYNCHRONOUS
MOTOR
Electrical Energy
AC Voltage
Mechanical Energy
Torque
Electrical Energy
AC Voltage

4. WORKING PRINCIPLE OF SYNCHRONOUS GENERATOR
 AC Generators or specifically Alternators operate on the
same fundamental principles of electromagnetic
induction as D.C. GENERATORS which was proposed by
Faraday.
 It means the synchronous generator works on
the principle of Faraday laws of electromagnetic
induction.
 The relative motion between the stationary conductor
and the rotating field(Magnetic field on rotor) induces
the EMF in the stationary conductor. The wave shape of
the induces voltage always a sinusoidal curve.
In synchronous generator
 Armature windings on Stator
 Field windings on Rotor – Which is energized by dc source to
develop rotor magnetic field.
 Rotor is turned by a prime mover, producing a rotating
magnetic field which induce 3 phase voltages in stator
windings
Stationary Conductor
Which is given by:-
Emf(e)=B.l.V volts
B- Instantaneous value of flux
density in tesla
l = length of stator conductor in
meter
V = Speed of conductor in m/sec

5. WORKING PRINCIPLE OF SYNCHRONOUS MOTOR
 Synchronous motor is a doubly excited machine i.e two
electrical inputs are provided to it.
 It’s stator winding which consists of a 3 phase winding is
provided with three phase supply.
 Rotor winding is provided with DC supply.
 The three phase stator winding carrying three phase
currents produces three phase rotating magnetic flux. The
rotor carrying DC supply also produces a constant flux.
 AC Motors capable of running at a fixed speed irrespective
of the applied load are called SYNCHRONOUS MOTORS.
 It work on the principle the magnetic interaction(Attraction)
of a Rotating Magnetic Field ( stator part ) and
one Constant Magnetic Field ( rotor part ).
 An additional rotation to the rotor is initially given in same
direction of the revolving magnetic field ( rmf ) .
 The opposite poles of rmf and the rotor gets
locked magnetically and the rotor starts rotating with the
same speed of rmf or at Synchronous Speed.
SYNCHRONOUS SPEED( Ns )= (120f)/p
Where,
f = frequency of electricity in Hertz.
p = No. of poles.
Rotating magnetic field