负载激励下采煤机永磁电机转子系统弯扭耦合振动分析

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摘要为分析不同负载激励对电机转子-轴承系统弯扭耦合振动特性的影响，以采煤机永磁电机转子系统为例建立电磁激励下的电机转子-轴承系统，并将负载激励考虑到偏心转子模型中。利用Lagrange方程推导了负载激励条件下转子系统的弯扭耦合动力学方程并基于Runge–Kutta法进行数值仿真，重点分析了不同负载激励下电机转子系统的弯扭耦合振动特性。仿真结果表明，负载激励会加剧转子偏心程度，但对转子弯曲振动的频率响应影响较小，振动响应主要由转频分量决定；而负载扰动对转子系统扭转振动响应具有不同的效果，不仅在扭振响应中激发出相应的频率成分形成多周期运动，还会明显增加扭振角幅值（0.001rad），振动响应主要由扰动频率和二倍转频分量决定。此外，负载激励中的低频成分将激发出较大的扭转振动响应（0.03rad），加速传动系统的疲劳损坏，影响转子系统的安全稳定运行。研究结果可为采煤机转子系统主动减振策略研究提供参考。

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	杜文龙1
	李威1
	姜耸1
	盛连超2

关键词 ：永磁同步电机, 不平衡磁拉力, 弯扭耦合振动, 负载激励, 振动特性

Abstract：In order to analyze the influence of load excitation on the coupled bending-torsional vibration characteristics for the rotor-bearing system, it takes the shearer permanent magnet motor rotor system as a case to establish the rotor-bearing system with electromagnetic excitation, meanwhile the load excitation is introduced to the eccentricities rotor system. The bending-torsional dynamic equations of rotor system considering the load excitation are obtained according to Lagrange equation, and the numerical simulation of the bending-torsional model is carried out based on the Runge-Kutta algorithm, focusing on the vibration characteristics of the rotor system under different load excitation. Results show that the load excitation will aggravate the degree of rotor eccentricity and but has a small effect on the frequency response of bending vibration, and the vibration response is dominantly determined by the rotation frequency component. On the contrary, the load excitation has a different effect on the torsional vibration, which will not only excite the corresponding frequency component in the vibration response and forms multiple-periodic motion, but also significantly increase the amplitude of torsional vibration angle (0.001rad), and the vibration response is dominantly determined by disturbance excitation frequency and the double rotation frequency component. In addition, the low frequency component of the cutting load will induce a large torsional vibration response (0.03 rad), accelerating the fatigue damage of the transmission system and affecting the stable operation of the rotor system. The research results can provide useful reference for the formulation of active vibration suppression control strategy of the rotor system in shearer.

Key words： Permanent magnet synchronous motor (PMSM) Unbalanced magnetic pull (UMP) Coupled bending-torsional vibration Load excitation Vibration characteristics

收稿日期: 2022-03-03 出版日期: 2023-04-15

引用本文:

杜文龙1，李威1，姜耸1，盛连超2. 负载激励下采煤机永磁电机转子系统弯扭耦合振动分析[J]. 振动与冲击, 2023, 42(7): 237-244.
DU Wenlong1, LI Wei1, JIANG Song1, SHENG Lianchao2. Flexural-torsional coupled vibration analysis of shearer permanent magnet motor rotor system under load excitation. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(7): 237-244.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I7/237

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