29-07-2011, 03:30 PM
[attachment=14909]
EQUIVALENT CIURCUIT AND PRE-DETERMINATION OF PERFORMANCE CHARACTERISTICS OF 1Ф INDUCTION MOTOR
AIM:
To draw the performance characteristics of a single phase induction motor by conducting the no-load and blocked rotor test.
FUSE RATING:
125% of 7.6A=10A
THEORY:
A 1-Ф induction motor consists of stator,rotor and other associated parts.In the rotor of a single phase winding is provided.The windings of a 1- Ф winding(provided) are displaced in space by 120º.A single phase current is fed to the windings so that a resultant rotating magnetic flux is generated.The rotor starts rotating due to the induction effect produced due to the relative velocity between the rotor winding and the rotating flux.
PRECAUTIONS:
NO LOAD TEST:
• Initially TPST Switch is kept open.
• Autotransformer is kept at minimum potential position.
• The machines must be started on no load.
