1. electrical machine1 J Role@ueab 2006 Three phase Induction Motor

2. electrical machine1 J Role@ueab 2006 Components of three phase motor Rotor and Fan Rotor and Fan indicates rotor bar size, shape and effects indicates rotor bar size, shape and effects Stator Core Stator Core Made of thin steel sheets called lamination Made of thin steel sheets called lamination Permeable Permeable Shell and Frame Shell and Frame Support the end frame Support the end frame End Brackets End Brackets Made of cast iron, cast aluminum or pressed steel Made of cast iron, cast aluminum or pressed steel Support bearing sleeve Support bearing sleeve Bearings Bearings Can be bal ir sleeve bearings Can be bal ir sleeve bearings

3. electrical machine1 J Role@ueab 2006 Operation of the three phase motor Directly linked to the phased alternator that powers Directly linked to the phased alternator that powers Positioning of the stator poles in booth is identical Positioning of the stator poles in booth is identical The alternator has a single phase winding spaced apart at 120 degrees apart from its stator The alternator has a single phase winding spaced apart at 120 degrees apart from its stator

4. electrical machine1 J Role@ueab 2006

7. 3F INDUCTION MOTOR ROTATING MAGNETIC FIELD - THE STATOR IS IDENTICAL TO THE SYNCHRONOUS MACHINE. ROTATING MAGNETIC FIELD - THE STATOR IS IDENTICAL TO THE SYNCHRONOUS MACHINE. MOTOR OPERATION – ROTOR CURRENTS ARE INDUCED BY TRANSFORMER ACTION. THE MOTOR RUNS AT LESS THAN THE SYNCHRONOUS SPEED. MOTOR OPERATION – ROTOR CURRENTS ARE INDUCED BY TRANSFORMER ACTION. THE MOTOR RUNS AT LESS THAN THE SYNCHRONOUS SPEED. a a’ b b’ c’ c B BbBb BaBa BcBc 3-phase, 2 pole machine

8. electrical machine1 J Role@ueab 2006