Alternator

ALTERNATOR

Ausonia srl After sales technical serviceAPR. 2009Page *

Alternator principle






~~Alternator principle




ALTERNATOR PRINCIPLESTATOR WINDINGROTOR WINDING


STATOR WINDINGALTERNATIVECURRENTDIRECTCURRENTALTERNATOR PRINCIPLEROTOR WINDING


ALTERNATOR PRINCIPLESTATOR WINDINGALTERNATIVECURRENTDIRECTCURRENTROTOR WINDINGRECTIFIERSEXCITER FIELD


SHUNT PRINCIPLESTATOR WINDINGALTERNATIVECURRENTDIRECTCURRENTROTOR WINDINGRECTIFIERSEXCITER FIELD


SHUNT PRINCIPLE 3 PHASESTATOR WINDINGALTERNATIVECURRENTDIRECTCURRENTROTOR WINDINGRECTIFIERSEXCITER FIELD


AREP PRINCIPLESTATOR WINDINGALTERNATIVECURRENTDIRECTCURRENTROTOR WINDINGRECTIFIERSEXCITER FIELD


COMPOUND PRINCIPLESTATOR WINDINGALTERNATIVECURRENTDIRECTCURRENTROTOR WINDINGRECTIFIERSEXCITER FIELDA.V.R.COMPOUNDINGTRANSFORMER


Star connectionPhase of ElectricityDelta connection


Single phase AC circuit:Two wires connected to electricity sourceDirection of current changes many times per secondPhase of Electricity3-phases of an electric system(Wikipedia contributors, 2005)Three phase systems:3 lines with electricity from 3 circuitsOne neutral line3 waveforms offset in time: 50-60 cycles/second


POWER FACTORkW = ACTIVE POWERkVA = POWERkV AR = REACTIVE POWERINDUCTIVE P.F. = INDUCTIVE LOAD, ASYNCHRONOUS MOTOR, TRANSFORMER ... (CURRENT IS LATE COMPARED TO THE VOLTAGE)CAPACITIVE POWER FACTOR : FLUORESCENT LIGHT, CAPACITOR ...(CURRENT IS FAST ON THE VOLTAGE)


GENSETSh


ALTERNATOR RATINGS CONTINUOUS DUTY S1/ 40C- IEC 34.1 DEFINITIONRUNNING AT CONSTANT LOAD LIMITED TO THE INSULATION CLASSPERMISSIBLE OVERLOAD 1 H EVERY 6 HOURS

STAND BY DUTY 40C- RUNNING AT CONSTANT LOAD WITHOUT OVER LOAD FOR ALIMITED DURATION OF MAXIMUM 500H/YEAR WITH A PERMISSIBLEINCREASE OF THE TEMPERATURE RISE ABOVE CLASS H

STAND BY DUTY 27C- SAME CONDITIONS THAN STAND BY DUTY 40C BUT WITH ACCEPTANCEOF A LOWER AMBIENT TEMPERATURE (27C) THAT ALLOWS TO INCREASE THE RATING AND THE TEMPERATURE RISE FOR THE SAME LEVEL OFTEMPERATURE IN THE GENERATOR

EX: S1/40C = 100 KW - STD BY/40C = 105 KW - STD BY/27C = 110 KW


FREQUENCYFREQUENCY (Hz) = Speed (min -1) x N (number of poles) 120

MAIN FREQUENCIES :

50 Hz : EUROPE, AFRICA, PART OF ASIA, PART OF SOUTH AMERICA.

60 Hz : NORTH AMERICA, PART OF ASIA, PART OF SOUTH AMERICA.

400Hz : AIRPORTS


ALTERNATOR SPEED2P4P6P8P10P12P14P16P

50 Hz300015001000750600500428375

60 Hz360018001200900720600514450SPEED IN MN -1 OR R.P.M. DIRECTION OF ROTATION

STANDARD : CLOCKWISE LOOKING FROM THE DRIVE END


ALTERNATOR RATINGSACTIVE POWER : KW

P = 3 UI Cos j (3 phase)

KW ENGINE

RATED POWER : kVA

S = 3 UI (3 phase)

KVA ALTERNATOR


Alternator partsMain GeneratorsParts & Assembling


Rotor Assembling


Cooling Fan


Main rotor


Rotating Diode


Ext. Rotor


Ext. Stator


Main stator


Frame


Terminal Box


Permanent magnetic


Air inletAir outlet


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