基于磁场调制理论的无轴承永磁薄片电机偏心不平衡磁拉力分析及其补偿  

Analysis and Compensation of Eccentric Unbalanced Magnetic Pulling Force in Bearingless Permanent Magnet Slice Motors Based on Magnetic Field Modulation Theory

作　　者：王锁 王宇[1] Wang Suo;Wang Yu(College of Automation Engineering Nanjing University of Aeronautics&Astronautics,Nanjing 210016 China)

机构地区：[1]南京航空航天大学自动化学院,南京210016

出　　处：《电工技术学报》2025年第6期1746-1757,共12页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51977107,U2141227,52377058);航空科学基金(2020HKZ0001)资助项目。

摘　　要：心室辅助系统、心脏泵对其薄片电机的悬浮性能要求较高,不平衡磁拉力对薄片电机的悬浮性能有很大的影响。已有研究忽略了定子的开槽对不平衡磁拉力的影响,模型精确度较低,补偿效果一般。该文利用气隙磁导比来衡量定子开槽对气隙的影响,与传统的不平衡磁拉力模型相结合,提出一种考虑开槽影响的电机偏心气隙磁场解析式,从磁场调制的角度分析偏心时不平衡磁拉力的产生机理,并计算开槽影响的电机偏心不平衡磁拉力。最后通过补偿实验验证了理论分析的正确性与必要性。Unbalanced magnetic pulling force significantly impacts the suspension performance of bearingless slice motors.Previous studies have overlooked the influence of stator slotting on an unbalanced magnetic pulling force,resulting in low model accuracy and average compensation effect.In addition,the existing models for analyzing the eccentric unbalanced magnetic pulling force of permanent magnet motors are unsuitable for bearingless permanent slice film motors that require high model accuracy.The existing models for bearingless permanent slice film motors do not consider the influence of stator slots,and the model accuracy is not high enough.Therefore,it is necessary to establish a high-precision analytical model that takes into account the influence of slotting to accurately analyze the unbalanced magnetic pulling force.The radial displacement of the rotor of a bearingless permanent magnet slice film motor during suspension is not zero.The geometric center of the rotor fails to be concentric with the geometric center of the stator,resulting in eccentricity.Such eccentricity distorts the originally sinusoidal air gap magnetic field and produces harmonics,which become the main source of unbalanced magnetic pulling force in thin film motors.A small amount of unbalanced magnetic pulling force generated from machining errors and asymmetric sensor installation is neglected.Therefore,accurately analyzing the air gap magnetic field under eccentricity is the key to accurately analyzing the unbalanced magnetic pulling force of bearingless permanent magnet slice motors.Combined with one-dimensional and two-dimensional analytical methods,this paper proposes an eccentric air gap magnetic field analysis method for bearingless slice film motors based on magnetic field modulation theory,considering the influence of stator slotting.The air gap magnetic permeability ratio measures the effect of slotting on the eccentric magnetic field of the motor,and the eccentric unbalanced magnetic pulling force is analyzed.Then,based on the theor

关 键 词：薄片电机 偏心不平衡磁拉力 磁场调制效应 不平衡磁拉力产生机理 

分 类 号：TM461[电气工程—电器]