不平衡磁拉力作用下无刷双馈电机的转子振动特性研究  

Rotor vibration characteristics of brushless doubly-fed machine under unbalanced magnetic pull

作　　者：任泰安[1,2,3] 吴霞 吴松荣 阚超豪[1] 田杰[4] 王群京[5] REN Taian;WU Xia;WU Songrong;KAN Chaohao;TIAN Jie;WANG Qunjing(School of Electrical Engineering and Automation,Hefei University of Technology,Hefei 230009,China;Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle Ministry of Education,Chengdu 610031,China;Undergraduate School,Hefei University of Technology,Hefei 230009,China;School of Mechanical Engineering,Hefei University of Technology,Hefei 230009,China;School of Electrical Engineering and Automation,Anhui University,Hefei 230601 China)

机构地区：[1]合肥工业大学电气与自动化工程学院,安徽合肥230009 [2]磁浮技术与磁浮列车教育部重点实验室,四川成都610031 [3]合肥工业大学本科生院,安徽合肥230009 [4]合肥工业大学机械工程学院,安徽合肥230009 [5]安徽大学电气工程与自动化学院,安徽合肥230601

出　　处：《电机与控制学报》2024年第4期102-110,共9页Electric Machines and Control

基　　金：磁浮技术与磁浮列车教育部重点实验室开放课题基金;中央高校基本科研业务费专项基金(JZ2021HGTA0157);湖北省机械传动与制造工程重点实验室开放基金(MTMEOF2021B03);安徽省工业节电与用电安全重点实验室开放课题(KFKT201905)。

摘　　要：无刷双馈电机长时间运行会出现转轴弯曲、轴承磨损等状况,导致气隙动偏心,并因此产生不平衡磁拉力,影响转子系统动力学特性。为了研究由不平衡磁拉力引起的转子振动特性问题,建立Jeffcott转子动力学模型,得出考虑不平衡磁拉力作用下转子系统的振动微分方程组,并对其自由振动响应进行了计算。以某型号无刷双馈电机的样机尺寸为例,分析气隙动偏心状态下电机气隙长度、转子材料及几何尺寸等对电机振动特性的影响,并利用Runge-Kutta法对振动微分方程组进行分析,结果表明:当转子动偏心率较小时,利用该转子系统的振动微分方程组计算出的解析解与数值计算结果吻合较好,转子的一阶振幅误差仅为0.2%,二阶振幅误差为2%,具有较高的精度且计算较为简便,为电机的高可靠运行提供理论支撑。When brushless dual feed is operated for a long time,the rotor shaft will bend and bear,which leads to the dynamic eccentricity of the air gap and the unbalanced magnetic pull,affecting the dynamic characteristics of the rotor system.In order to study the vibration characteristics of the rotor caused by the unbalanced magnetic pull,the Jeffcott rotor dynamic model was established to obtain the vibration differential equations of the rotor system considering the unbalanced magnetic pull,and then free vibration response was calculated.Taking a certain prototype of brushless doubly-fed machine(BDFM)as an example of size,the influence of the machine’s air gap length,rotor material and geometric size was analyzed on the machine’s vibration characteristics under the condition of air gap dynamic eccentricity,and the Runge-Kutta method was used to analyze the vibration differential equations.The results show that when the rotor eccentricity is small,the analytical results calculated by the vibration differential equations of the machine system are in good agreement with the numerical results,the first-order amplitude error of the rotor is only 0.2%,and the second-order amplitude error is 2%,which can be simply calculated with the high accuracy.The conclusions provide theoretical support for highly reliable operation of the machine.

关 键 词：无刷双馈电机 转子系统 动偏心 振动特性 不平衡磁拉力 

分 类 号：TM30[电气工程—电机]