STRAY LOSS ESTIMATION IN INDUCTION MOTOR

In this work, an accurate formulation and estimation of stray power losses in induction machines are proposed. Stray losses are estimated by derived formulas based on the leakage fluxes from the induction machine windings. These leakage fluxes induce voltage drops in the machine stator and rotor iron cores and eddy currents in the machine windings, causing stray power losses in the machine iron cores and windings. By adding these losses, a completed estimation of stray losses can be obtained and implemented in the equivalent machine circuit. The stray losses are represented by stray loss resistances connected in series with the stator and rotor circuits. Due to the stray loss in the rotor circuit depending largely on the machine slip this may be omitted without influencing the accuracy of stray loss calculations. The obtained formulas of stray loss estimation are practically satisfied. An accurate loss calculation in induction machines is very useful in the energy-saving issue