以大功率储能飞轮转子系统为研究对象,探究电机转子存在初始静偏心时飞轮动力学特性的变化规律。首先使用能量法求出电机转子不平衡磁拉力（UMP）与转子偏心位移之间的关系,采用Timoshenko梁单元模型建立包含UMP的飞轮转子机电耦合动力学模型,计算分析电机转子初始偏心量和偏心方向对飞轮稳态和瞬态特性的影响,得出以下结论：随着偏心量的增大,上轴承处轴心轨迹出现嵌套圆环,频谱出现3种频率成分且幅值增大,升速响应曲线共振峰的峰值增大,对应转速减小;当偏心方向改变且旋转一周时,转频等成分的幅值、升速响应曲线共振峰值产生明显的周期规律变化。
Abstract
A high-power energy storage flywheel rotor system is taken as the research object to explore the dynamic characteristics of the flywheel rotor when the motor has initial static eccentricity. Firstly, the relationship between the unbalanced magnetic pull （UMP） and the eccentric displacement of the motor rotor is calculated using energy method. And then the electromechanical coupling dynamic model of the flywheel rotor considering UMP is established using the Timoshenko beam element model. Finally, the effects of the magnitude and direction of the eccentricity on steady and transient state dynamic characteristics of the flywheel rotor system are calculated and analyzed. The following conclusions are drawn that with the increase of eccentricity, a nested ring appears in the axial trajectory at the upper bearing, three frequency components appear in the spectrum diagram and their amplitudes increase, and the formant values of the acceleration response curve increase, while the critical speeds decrease. When the eccentric direction changes and the rotor rotates one circle, the amplitude of frequency components such as rotation frequency, the formant values of the acceleration response curve have obvious periodic changes.
关键词
飞轮 /
转子 /
储能 /
动力学 /
初始静偏心 /
不平衡磁拉力 /
机电耦合
Key words
flywheels /
rotors /
energy storage /
dynamics /
initial static eccentricity /
unbalanced magnetic pull /
electromechanical coupling
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