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不平衡磁拉力作用下无刷双馈电机的转子振动特性研究

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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.
Rotor vibration characteristics of brushless doubly-fed machine under unbalanced magnetic pull
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 differ-ential equations of the rotor system considering the unbalanced magnetic pull,and then free vibration re-sponse was calculated.Taking a certain prototype of brushless doubly-fed machine(BDFM)as an exam-ple 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.

brushless doubly-fed machine(BDFM)rotor systemdynamic eccent-ricityvibration charac-teristicsunbalanced magnetic pull

任泰安、吴霞、吴松荣、阚超豪、田杰、王群京

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合肥工业大学 电气与自动化工程学院,安徽 合肥 230009

磁浮技术与磁浮列车教育部重点实验室,四川 成都 610031

合肥工业大学 本科生院,安徽 合肥 230009

合肥工业大学 机械工程学院,安徽 合肥 230009

安徽大学 电气工程与自动化学院,安徽 合肥 230601

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无刷双馈电机 转子系统 动偏心 振动特性 不平衡磁拉力

磁浮技术与磁浮列车教育部重点实验室开放基金中央高校基本科研业务费专项湖北省机械传动与制造工程重点实验室开放基金安徽省工业节电与用电安全重点实验室开放基金

JZ2021HGTA0157MTMEOF2021B03KFKT201905

2024

10.15938/j.emc.2024.04.011

电机与控制学报
哈尔滨理工大学

电机与控制学报

CSTPCD北大核心
影响因子：1.014
ISSN：1007-449X
年,卷(期)：2024.28(4)
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