Optimized Pulse Patterns for Anisotropic Synchronous Machines

Abstract

Advanced optimized pulse patterns (OPPs) that account for the magnetic anisotropy of permanent magnet synchronous motors (PMSMs) have recently gained the attention of the automotive industry due to the improvements they offer in the current quality. However, these improvements can lead to torque quality degradation and an increased dc-link current ripple. To address this problem, a hybrid modulation scheme that combines isotropic and anisotropic OPPs is proposed in this paper to achieve the best overall performance over the whole range of operating points. To do so, as shown with the presented results, different OPPs are assessed and those with the best overall performance are selected.