Harmonic injection method for NVH optimization of permanent magnet synchronous motors considering the structural characteristics of the machine

Noise, vibration and harshness (NVH) is one of the most important performance evaluation aspect of electric motors. Among the different causes of the NVH issues of electrical drives, the high-frequency spatial and temporal harmonics of the electrical drive system is of great importance. To reduce the tonal noise of the electric motors, harmonic injection methods can be applied. However, a lot of the existing related work focuses more on improving the optimization process of the parameter settings of the injected current/flux/voltage, which are usually limited to some specific working conditions. The applicability and effectivity of the algorithm to the whole frequency/speed range are not investigated. In this paper, a multi-domain pipeline of harmonic injection controller design for a permanent magnet synchronous motor (PMSM) is proposed. And the structural properties of the machine described by 2-dimensional transfer functions are used to help effectively set proper harmonic injection parameters for different working conditions. The proposed method is validated by the multi-physics co-simulation of the Prius 2004 PMSM model.