Implementation and validation of a new analytic-numeric method for dynamic core loss calculation

This paper describes the implementation and functionality of a new analytic-numeric dynamic core loss model for permanent magnet synchronous machines (PMSM). The tool chain is presented and validated by experimental results. In contrast to conventional core loss models (according to Steinmetz, Bertotti and Jordan), the presented method uses the stator flux linkage vector — an integral and thus indirectly measurable machine quantity — instead of frequency and flux density as input variable to calculate core losses instantaneously in time domain. Initially, a one-time numerical characterization of the loss distribution in the machine is required which is described subsequently. After completion of the so-called identification routine, which is valid for a wide operating range, only the real state of magnetization — more precisely the stator flux linkage vector — is necessary to calculate core losses instantaneously for any excitation. Experimental investigations underline the significance of transient core loss modeling and prove the functionality of the described approach.