Investigation of Losses and Efficiency in Switched Reluctance Motor

This paper deals with estimation of losses and efficiency of Switched Reluctance Motor (SRM), which is supplied from converter and motor is working under load conditions with different torques and at different speeds. The losses in a SRM consist mainly of stator winding losses and core losses. The winding losses are proportional to the square of the r.m.s current whereas the core losses are function of the excitation frequency and flux density, but the flux density depends on stator current waveforms. The different parts of the SRM core are subjected to the different frequency of flux reversals when the electric machine is operating at constant speed and load. This paper deals with investigation of copper losses including skineffect and iron losses in individual parts of SRM by means of two analytical approaches and by means of FEM. The efficiency of SRM and converter is measured and presented. The calculations of a real 3-phase 12/8 SRM are verified by measurements.