汕头大学学报（自然科学版）

为抑制永磁转子在循环水系统中的振动与噪声并提升运行稳定性，本研究基于模态分析原理与方法，采用有限元软件建立了改进前后的转子系统三维模型，通过结构优化设计（包括轴径增加、轴承类型更换与间距调整），从模态分析、谐响应分析及实验测试三方面系统探讨了永磁转子在循环水工况下的振动特性.结果表明：转轴旋转频率为50 Hz，改进前永磁转子系统1、2阶固有频率分别为134.1 Hz与340.39 Hz；改进后则提升至234.28 Hz与352.52 Hz，系统固有频率显著提高，有效降低了共振风险.谐响应分析进一步表明，改进后各频率下永磁转子的振幅减小一倍，振动试验结果与理论值接近，误差小于3.5%.研究为永磁调速系统在循环水环境中的振动控制与结构设计提供了理论依据与工程参考，有效保障了循环水泵系统的节能与稳定运行.

To suppress vibration and noise and enhance operational stability of the permanent magnet rotor in the circulating water system, this study established three-dimensional models of the rotor system before and after improvement using finite element software based on modal analysis principles and methods.Through structural optimization design—including increased shaft diameter, replacement of bearing type,and adjustment of bearing spacing—the vibration characteristics of the permanent magnet rotor under circulating water conditions were systematically investigated from three aspects: modal analysis, harmonic response analysis, and experimental testing. The results show that the rotational frequency of the shaft is 50 Hz.The first and second-order natural frequencies of the permanent magnet rotor system before improvement were 134.1 Hz and 340.39 Hz, respectively. After improvement, they increased to 234.28 Hz and 352.52 Hz,indicating a significant enhancement in the system's natural frequencies and effectively reducing the risk of resonance. Harmonic response analysis further revealed that the amplitude of the permanent magnet rotor was significantly reduced across various frequencies after improvement. Vibration test results were in close agreement with theoretical values, with errors less than 3.5%. This research provides theoretical basis and engineering reference for vibration control and structural design of permanent magnet speed regulation systems in circulating water environments, effectively ensuring energy-saving and stable operation of the circulating water pump system.