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It will be help full for AC Motor winding
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PRESENTATION ON:
INDUCTION MOTORPRESENTING BY:
MUHAMMAD NAVEED ASIM
ELECTRIC MOTOR
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An electric motor is an electromechanical device that converts electrical energy to mechanical energy.
CLASSIFICATION OF MOTORS
Electric Motors
Alternating Current (AC) Motors
Direct Current (DC) Motors
Synchronous Induction
Three-PhaseSingle-Phase
Self ExcitedSeparately Excited
Series ShuntCompound
AC MOTOR: INDUCTION MOTOR
Most common motors in industry
Advantages: Simple design Inexpensive High power to
weight ratio Easy to maintain Direct
connection to AC power source
MOTOR WINDING
AC-SINGLE PHASE MOTOR WINDING
AC-THREE PHASE MOTOR WINDING
SINGLE PHASE AC MOTOR WINDING
AC-SINGLE PHASE MOTOR WINDING METHOD
1 HP SINGLE PHASE MOTORNO.OF SLOTS IN STATOR
CURRENT 1 AMPARERUN PER MINUTE 1450/1500
VOLTAGE 230-250FREQUENCY 50 Hz
ACCORDING TO WINDING METHOD
REQUIRED INFORMATION:NO. OF POLESNO. OF SETS
NO. OF COILS IN SETSCOIL PICH IN EVERY SET
TURNS OF COILWIRE SIZE OF EVERY SET
FORMULA
WE CAN FIND.NO. OF POLES = 2 * 60 *FREQUENCY/RPM
2 * 60 *50/1500 = 4 POLES
NO. OF SETSIF POLES ARE 4 AND RPM 1500 AND VOLTAGE 230
TO 250CAPACITOR START MOTOR
KNOWN:WINDING WILL BE DOUBLE
1. STARTING WINDING2. RUNNING WINDING
NO. OF COILS IN A SET COILS OF STARTING WINDING = 3COILS OF RUNNING WINDING = 3
STARTING WINDING COILS 3 * 4 = 12RUNNING WINDING COILS = 3 *4 = 12
TOTAL COILS IN MOTOR = 24
NO. OF TURNS OF STARTING AND RUNNING WINDINGS
STARTING WINDINGTURNS = 100PICHES 1-7, 2ND 1-5, 3RD 1-3SUM= 3+5+7=15TURNS BIG COIL=TOTAL TURNS *
COIL PICH/SUM OF PICHES1ST PICH(1-7) = 100 * 7/ 15 = 46
TURNS2ND PICH(1-5) = 34 TURNS3RD PICH(1-3) = 20 TURNS
TOTAL = 46 + 34 + 20 = 100
USED NARROW WIRES.W.G 23
RUNNING WINDING
TURNS = 75PICHES 1-7, 2ND 1-5, 3RD 1-3SUM= 3+5+7=15TURNS BIG COIL=TOTAL TURNS * COIL
PICH/SUM OF PICHES1ST PICH(1-7) = 75 * 7/ 15 = 35 TURNS2ND PICH(1-5) = 25 TURNS3RD PICH(1-3) = 15 TURNS
TOTAL = 35 + 25 + 15 = 75USED THICK WIRES.W.G 21
COIL PICH AND SIZE OF WIRE
COIL PICHWINDING PICH = NO. OF SLOTS +1/NO. OF
POLES
(32 + 1)/4 = 72ND = 7-2 = 53RD = 5-2 = 3
SIZE OF WIREEXAMPLE:MOTOR HP = 20 HPVOLTAGE = 400VI = (20 *
746)/400=37.3AAREA = 37.3/2000 =
0.01865AREA IS SQUARE PER INCHWIRE SIZE (S.W.G) = 8
SINGLE PHASE AC MOTOR RUNNING WINDING
SINGLE PHASE AC MOTOR WINDING
CONECTIONS OF INTERNAL COILS
HOW SINGLE PHASE MOTOR WORKS
THREE PHASE MOTOR WORKS
THREE PHASE MOTOR WORKS