DQ0-MODELLING AND PARAMETRIZATION APPROACHES FOR SMALL DELTA CONNECTED PERMANENT MAGNET SYNCHRONOUS MACHINES

Abstract

This paper presents an extended dq0-model for small delta connected permanent magnet synchronous machines and a suiteable parametrization approach for testbench measurements. The familiar dq-fundamental equations are thereby extended to consider harmonic effects. This allows the inclusion of the zero-sequence flux-linkage. The extended dq0-model is based on the position dependent dq0-flux-linkages and the ohmic resistance and enables the calculation of the zero-sequence current as well as a more precise inner torque representation. The parametrization of this model can be either achieved by software calculations or testbench measurements. The rotor position dependent dq-flux-linkage calculation is based on the dq-voltages and the solution of the resulting simplified differential equations at constant currents. Detection of the zero-sequence current yields the zero-flux-linkage. In this paper, Finite Element Analysis data for a device under test is used to derive and show the parametrization approaches.