Yuanzhi Zhang, Yanshuo Jia, Fang Li, Rui Li, Pengye Wang, Yihang Luan, Jianjun Sun, Xiaoming Zha
Low vibration is a critical performance metric for high-speed electrical machines, particularly in applications requiring stringent acoustic compliance. For integer-slot PM synchronous machines, the main sources of vibration under different speed are the radial electromagnetic force harmonics of different frequencies which are related to the rotor pole pairs and stator slots. In this paper, a novel vibration suppression method concerning a vibration-reducing winding is proposed. The vibration-reducing winding injected with specific harmonic current can produce flux density of specific spatial-temporal properties which interact with that from the armature winding and PMs, producing the radial force which could offset the primary vibration-induced radial force harmonics. Compared with the conventional harmonic-current injection method, the proposed method effectively suppresses the primary radial electromagnetic force of different frequency over a wide speed range with small electric load. Finally, the proposed method is verified to reduce the vibration acceleration by over 60% via both FEA and experimental method, while the electric load of the vibration-reducing winding is only 5.6% that of the armature winding.