electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

Three phase Induction Three phase Induction MotorMotor

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

Components of three phase motorComponents of three phase motor

Rotor and Fan Rotor and Fan indicates rotor bar size, shape and effectsindicates rotor bar size, shape and effects

Stator CoreStator Core Made of thin steel sheets called laminationMade of thin steel sheets called lamination PermeablePermeable

Shell and FrameShell and Frame Support the end frameSupport the end frame

End BracketsEnd Brackets Made of cast iron, cast aluminum or pressed steelMade of cast iron, cast aluminum or pressed steel Support bearing sleeveSupport bearing sleeve

BearingsBearings Can be bal ir sleeve bearingsCan be bal ir sleeve bearings

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

Operation of the three phase motorOperation of the three phase motor

Directly linked to the phased alternator that Directly linked to the phased alternator that powerspowers

Positioning of the stator poles in booth is Positioning of the stator poles in booth is identicalidentical

The alternator has a single phase winding The alternator has a single phase winding spaced apart at 120 degrees apart from its spaced apart at 120 degrees apart from its statorstator

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

3F INDUCTION MOTOR3F INDUCTION MOTOR

ROTATING MAGNETIC FIELD ROTATING MAGNETIC FIELD - THE STATOR IS - THE STATOR IS IDENTICAL TO THE SYNCHRONOUS MACHINE. IDENTICAL TO THE SYNCHRONOUS MACHINE.

MOTOR OPERATION – MOTOR OPERATION – ROTOR CURRENTS ARE ROTOR CURRENTS ARE INDUCED BY TRANSFORMER ACTIONINDUCED BY TRANSFORMER ACTION. . THE THE MOTOR RUNS AT LESS THAN THE SYNCHRONOUS MOTOR RUNS AT LESS THAN THE SYNCHRONOUS SPEED. SPEED.

a

a’

b

b’c’

c

B

Bb

BaBc

snn S 1

3-phase,2 pole machine

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006

electrical machine1 J Roleelectrical machine1 J Role@ueab 2006@ueab 2006