摘要
双并列转子永磁同步电机由于部分定子铁心和绕组的缺失,存在较大的转矩脉动,限制了其在并行对驱类机械装备中的应用。该文对双并列转子永磁电机转矩脉动产生机理进行分析,并提出了相应的抑制方法。对比了N-N型、N-S型两种转子结构,阐明了N-S型转子结构的优越性。在此基础上,开展了转矩脉动产生机理研究,按照影响因素不同,逐次分析了齿槽效应、端部效应、永磁齿轮效应以及绕组参数不对称对电机转矩脉动的作用机理,构建了各个转矩分量的解析表达式。通过有限元模型,验证了理论分析的正确性。针对产生转矩脉动的不同分量,提出了相应的抑制方法,其中抑制空载转矩可以通过优化电机的结构参数来实现,抑制纹波转矩可以通过优化绕组位置分布来实现。搭建样机实验平台,验证了分析模型的准确性。
In extruder,two-roll mill,twin-screw pump and other parallel driving mechanical equipment,the current driving mode is an induction motor to drive the drive shaft,and the drive shaft transmits the torque to the driven shaft through the synchronous mechanical gear.This transmission mode has some problems,such as large system volume,low system efficiency,difficult sealing,and regular maintenance.Therefore,the dual-parallel rotor permanent magnet synchronous motor has gradually attracted attention.Due to the absence of partial stator core and windings,the dual-parallel rotor permanent magnet synchronous motor has a large torque ripple,which limits its application in parallel drive machinery.In this paper,the mechanism of torque ripple in dual-parallel rotor permanent magnet motor is analyzed,and the corresponding suppression methods are proposed.Firstly,the advantage of N-S type rotor is illustrated by comparing the N-N type and N-S type two rotor structures.On this basis,the mechanism of torque ripple is studied.According to the different influencing factors,the mechanism of cogging effect,end effect,permanent magnet gear effect and winding parameter asymmetry on the motor torque ripple are analyzed step by step,and the analytical expression of each torque component is constructed.Secondly,the correctness of theoretical analysis is verified by finite element model.According to the different components of torque ripple,the corresponding suppression methods are proposed.The suppression of no-load torque can be realized by optimizing the structure parameters of the motor,and the suppression of ripple torque can further be realized by optimizing the windings position distribution.Finally,a prototype test platform is built to verify the accuracy of the analytical model.The following conclusions can be drawn from the simulation analysis:(1)The torque ripple of dual-parallel rotor permanent magnet synchronous motor comes from four components,namely,cogging torque,end effect torque,permanent magnet gear transmission torque and ripple torque caused by asymmetry of winding parameters,and the first three components are collectively referred to as no-load torque.(2)No-load torque is the main component of torque ripple,ripple torque is a secondary component of torque ripple.The 2nd harmonics,12th harmonics and 24th harmonics in no-load torque are the most important components.Among them,the 2nd harmonic is caused by the end effect torque and the permanent magnet gear transmission torque,the 12th harmonic and the 24th harmonic are caused by the cogging torque.The 12 harmonics content in ripple torque is the largest.(3)The no-load torque of the motor can be effectively suppressed by optimizing the structural parameters of the motor,such as the polar arc coefficient of the permanent magnet,the eccentricity of the permanent magnet,the duty angle,the coupling distance,and the shape of the core end at the splice.Ripple torque can be suppressed to some extent by optimizing the winding position distribution.
作者
陈阳
陶大军
王立坤
戈宝军
李守鹏
Chen Yang;Tao Dajun;Wang Likun;Ge Baojun;Li Shoupeng(National and Local Joint Engineering Research Center of Large Machines and Heat Transfer Technology,Harbin University of Science and Technology,Harbin 150080,China)
出处
《电工技术学报》
EI
CSCD
北大核心
2024年第20期6357-6370,共14页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(51777048)。
关键词
双并列转子
永磁同步电机
转矩脉动
空载转矩
结构优化
Dual-parallel rotor
permanent magnet synchronous motor
torque ripple
no-load torque
structure optimization
