Modeling of stray losses in equivalent circuit of induction machines

Abstract

In this paper accurate modeling and calculations of stray power losses in induction machines are proposed. These losses are calculated by derived formulas based on the leakage fluxes in the stator and rotor circuits of the induction machines. These leakage fluxes induce voltage drops in the stator and rotor iron cores and eddy current in the stator and rotor windings causing stray power losses in iron cores and winding and by adding these losses a completed determination of stray losses can be obtained and implemented in the equivalent machine circuit and represented by stray loss resistances in the stator and rotor circuits. Due to the stray loss in the rotor circuit depends largely on the machine slip, this can be neglected without influencing the accuracy of stray loss calculation. The validity of the derived formulas for stray loss calculation is satisfied by comparing the theoretical results with that obtained experimentally. An accurate loss calculation in induction machines is very important issue in energy saving.