Thrust Ripple Suppression Based on Negative Current Control for Short-Primary Low-Speed Large LIM Under Transient Operation
Thrust Ripple Suppression Based on Negative Current Control for Short-Primary Low-Speed Large LIM Under Transient Operation
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DOI：
10.1109/tec.2023.3241166
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发表时间：
2023-09
影响因子：
4.9
通讯作者：
Xingfa Sun;Jin Xu;Jun-jie Zhu;Wei Xu
中科院分区：
文献类型：
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作者：
Xingfa Sun;Jin Xu;Jun-jie Zhu;Wei Xu
直线感应电机的端部效应导致电机的磁不对称和推力涟漪，严重制约了直线感应电机的性能和应用。现有的推力涟漪建模和补偿方法大多集中在稳态，其瞬态性能较差。此外，不对称的电流对输出推力的影响被考虑。本文首先详细分析了一种可忽略动态纵向端部效应的低速大型直线电机推力涟漪特性及其影响因素。在此基础上，提出了一种数据驱动的瞬态推力涟漪提取与建模方法。通过小波分解和重构提取非平稳时变推力涟漪信号，利用粒子群优化算法离线训练推力涟漪模型的多项式参数。最后，在六相直线电机动力学模型的基础上，考虑正负电流解耦和反馈控制，提出了一种改进的瞬态推力涟漪抑制方案。全尺寸实验结果充分证明了所提出的数据驱动的瞬态推力涟漪模型的准确性在90%以上。在大推力运行阶段，采用改进的控制方案，直线电机100 Hz以内的轴向振动加速度水平降低了12 dB以上。
End effect of linear induction motor (LIM) leads to magnetic asymmetry and thrust ripple, which seriously restricts the performance and application of LIM. Existing methods for thrust ripple modeling and compensating have mostly focused on the steady state, which suffer from poor transient performance. Moreover, the influence of asymmetric currents on output thrust is not considered. In this paper, the thrust ripple characteristics and impact factors of a low-speed large LIM with negligible dynamic longitudinal end effect are analyzed in details, firstly. Then, a data-driven extracting and modeling method for transient thrust ripple is proposed. The non-stationary time-varying thrust ripple signal is extracted through wavelet decomposition and reconstruction, the polynomial parameters of thrust ripple model are trained off-line by particle swarm optimization algorithm. Finally, an improved suppressing scheme for transient thrust ripple is proposed, considering the decoupling and feedback control of positive and negative currents, based on the dynamic model of six-phase LIM. Full-scale experimental results have fully demonstrated the accuracy of proposed data-driven transient thrust ripple model is more than 90%. During the high-thrust operating stage, the axial vibration acceleration level of LIM within 100 Hz is reduced by more than 12 dB, with the adoption of improved control scheme.