Pulse Pattern Optimization for IPMSM Considering Voltage, Current and Power Harmonics

Apply of Optimized Pulse Patterns (OPPs) with interior permanent magnet synchronous machines (IPMSM) is receiving significant attention from automotive industry as a mean to improve the efficiency of the traction drives. Traditionally, voltage harmonics or current harmonics have been considered for the optimization process. This paper discusses and compares three different cost functions to be used with IPMSM considering voltage, current, and power harmonic losses. The analysis will consider complexity, accuracy and parameter sensitivity. Current harmonics are first obtained from the voltage harmonics produced by the OPP. Analytical models obtained using the theory of asymmetric circuits will be used for this purpose. The variation of the machine parameters with the injection frequency will be shown to have a great impact on the behavior of the machine losses. A novel cost function considering this machine parameter variation to reduce the harmonic power losses is proposed in this paper. The proposed methodology will be implemented in Matlab. Simulink will be used for the preliminary validation of the analytical results. In addition, FEM is used to assess the accuracy of the analytical results.