Sudden short-circuit analysis of a salient permanent magnet synchronous machine with buried magnets for traction applications

This paper discusses the three-phase sudden short-circuit in a rotor-oriented reference frame and the involved torque of a salient permanent magnet excited synchronous machine with buried magnets (PMSM). The paper will demonstrate the influence of machine parameters like the stator resistance, the direct and quadrature inductance on the resulting currents and torque at short-circuit conditions. It will be shown that the produced drag torque as well as the drag losses could be minimized by varying the machine parameters. The results of the analytical calculation of the non-saturated PMSM are compared with measurements.