Comparison of outer rotor PMSM with single- and double-layer windings at same machine geometry with respect to the sensorless control capability

This paper discusses the sensorless control capability of an outer rotor PMSM with two different concentrated stator coil winding configurations resulting in a single- and double-layer configuration at same machine geometry. As a key parameter the differential inductance in direct and quadrature axis over current load is measured and compared. Furthermore the steady state short circuit current is calculated analytically and measured.