摘要
研究气隙偏心对永磁同步电机转子系统振动特性的影响。建立了气隙偏心下转子的动力学模型,结合永磁同步电机在带负载工作下转子永磁体及电枢电流共同形成的气隙磁场分布情况,利用Maxwell应力张量法计算了气隙偏心造成的不平衡磁拉力,并代入转子系统运动方程;通过实例分析,详细讨论了不同偏心以及负载类型对转子系统振动特性的影响。结果表明:质量偏心在增大转子振动的同时会削弱不平衡磁拉力的影响,使振动趋于规则;初始静偏心的大小和方向都将影响转子振动特性,当其方向和重力方向相反,振动强度将有所减弱;当外部负载转矩发生变化,其相应谐波频率的振动将被激发出来。
The vibration characteristics of a rotor system of a permanent magnet synchronous motor with air-gap eccentricity were studied.The dynamic model of the rotor system was built.According to the distribution of magnetic flux density generated by permanent magnet and the armature current under loaded,the unbalanced magnet pull （UMP）was calculated with Maxwell stress tensor method and it was substituted into the dynamic model.Through several illustrating numerical examples,the effects of different eccentricities and loads on the rotor vibration were discussed in detail.The results showed that the mass unbalance weakens the effect of the UMP and aggravates the vibration of the rotor;the magnitude and orientation of initial eccentricity can also change the vibration characteristics of the rotor,and the vibration is weakened when the orientation of initial eccentricity is opposite to that of gravity;as the load torque changes,the corresponding vibration components are excited with the same harmonic frequencies as those of the load.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第8期29-34,共6页
Journal of Vibration and Shock
基金
国家自然科学基金(11172260
11072213)
高等学校博士学科点专项科研基金(20110101110016)
关键词
永磁电机
气隙偏心
不平衡磁拉力
负载转矩
振动特性
permanent magnet motor
air-gap eccentricity
unbalanced magnet pull
load torque
vibration charac-teristics
