STANDSTILL FREQUENCY-RESPONSE TESTING AND MODELING OF SALIENT-POLE SYNCHRONOUS MACHINES

Standstill Frequency Response (SSFR) testing and modeling of salient-p ole synchronous machines are presented for two machines with integral and non-integral number of stator slots per pole per phase. Frequency responses at different rotor positions have been investigated to explo re the effects of rotor position in a machine with fractional slot win ding, as the electromagnetic fields and the armature magnetomotive for ces do not precisely repeat every pole. The test results do not show a ny significant differences for various direct and quadrature axes roto r positions. The authors obtained a negative value of differential lea kage inductance as theoretically postulated in the literature. The per tinent features of testing and modeling of salient-pole synchronous ma chines are described to point out the differences with SSFR testing of round rotor turbogenerators extensively published in the literature.