Measurement of parameters for interior permanent magnet motors

In this paper, a brief review of methods for measurement of reactance parameters of interior permanent magnet (IPM) synchronous motors is presented. An update of new approaches is also given for extracting saturated parameters L_d, L_q and permanent-magnet flux linkage Lambda_md with arbitrary load conditions for IPM motors. The new procedure starts with the parameter extraction in actual abc reference frame based on transient finite element analysis (FEA) solutions in time-domain. Then the parameters in abc reference frame are transformed to d-q axis reference frame via Park transformation. As a result, this approach is able to provide better accuracy and allow easy implementation because the parameters are derived from a realistic physical representation and the effects of the slot leakage and phase-spread harmonic fields are included.