CALCULATION OF PERFORMANCE OF CAPACITOR START SINGLE PHASE INDUCTION MOTORS

Abstract

The single phase Induction motor enjoys versa-tile application in every day life because of its lowr cost, simplicity and ruggedness of construction.. But, the inquisitive engineering mind has still. found it elusive to frame it within a perfect theory which can satisfactorily explain its every aspect. For the last fifty years various theories have been propounded and each has its own limitations. These theories are s (a) The cross Field Theory (b) The Double Revolving Field Theory and (c) The Symmetrical components Theory. It is worth-while to know what these are. l.11 Cragg Field Theory H.R. West(l) in the year 1926 put forth this theory according to which the components of the main flux of the motor and the rotor currents are considered separately in two axes at right angles to each other. The axis of the stator winding Is. called as the transformer axis, and the axis at right angles to it the field axis. A squirrel cage induction motor rotor is considered as equivalent to a commutator winding with brushes bearing on