Modeling and Parameter Measurement of Synchronous Reluctance Motors Including Stator Iron Loss

Abstract

This paper presents voltage equations and a parameter measurement for synchronous reluctance motors including the stator iron loss. The stator iron loss is modelled by additional windings on three-phase axes. These windings are transformed into d-q axes and are represented as equivalent eddy current circuits. The stator iron loss is introduced as equivalent iron loss resistances in voltage equations on the assumption that the losses in the stator core are produced in the equivalent eddy current circuits on d-q axes. The voltage equations including the equivalent iron loss resistances are derived by use of time constant approximations of equivalent eddy current circuits.
Parameters, which are the equivalent iron loss resistance and the d-q axes self-inductances, in the voltage equations are measured by P-Q circle diagram method. As the P-Q circle diagram method is implemented in synchronous condition, the exactly measurement is possible.