Field-Oriented Control of a Reduced Order Model of a Nine-Phase PMSM in Healthy and Faulty Case

In the task of electrification in various fields, the electrical machine is an important component. Current research show a rising interest in multiphase types, because of their advantages like inherent fault tolerance or lower current per phase. In this paper, the reduced order model of a nine-phase permanent magnet synchronous machine is developed and analyzed. The reduced order model is built using a lookup table created by simulation of certain operating points in an FEA model. To reduce calculation time, current and flux values are transformed into dq-coordinates. Two cases are considered: the healthy and an inter-turn short circuit fault case. For both cases the same control topology, a field-oriented control, with the same parameters is used. The healthy case is validated with an analytical model. The faulty case is then analyzed to firstly visualize the impact of the fault in the control scheme and secondly identify attributes, such as certain harmonic components, to detect this fault scenerio. With a reliable detection, a fault-tolerant control can be applied in future papers.