双并列转子永磁直驱电机转子不平衡力分析与优化  

Analysis and Optimization of Unbalanced Electromagnetic Force on the Rotor of Dual-Parallel Rotor Permanent Magnet Direct-Driven Motor

作　　者：陶大军[1] 陈阳[1] 李峥 戈宝军[1] Tao Dajun;Chen Yang;Li Zheng;Ge Baojun(National and Local Joint Engineering Research Center of Large Machines and Heat Transfer Technology Harbin University of Science and Technology,Harbin 150080 China)

机构地区：[1]大型电机电气与传热技术国家地方联合工程研究中心(哈尔滨理工大学),哈尔滨150080

出　　处：《电工技术学报》2024年第10期2961-2973,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51777048)。

摘　　要：双并列转子永磁直驱电机受轴间距限制,设计时会切掉部分定子铁心和绕组,造成转子电磁力不平衡。为最大限度地抑制转子所受的不平衡电磁力,该文从双并列转子结构出发,分析了电机绕组电感参数不对称的原因,提出通过合理设计线圈跨距和分布平衡三相电感。在此基础上,构建转子所受总电磁力的数学模型,理论分析各个分力的来源及影响因素,研究各个分力对转子所受总电磁力的影响,提出了优化占空角、优化耦合间距、采用定子端部不对称结构、采用转子偏心结构和切除部分单元电机五种优化方法,实现对转子所受电磁力的优化,探讨了不同方法的优化效果,以及其对转矩脉动的影响,总结了不同优化方法的优缺点。Most parallel synchronous drive equipment,such as the two-roll mill and twin-screw pump,are driven by an induction motor with synchronous mechanical gear.Such drive systems have large volumes,poor synchronization of master and slave shafts,requiring regular maintenance.A dual-parallel rotor permanent magnet direct-driven motor has gradually come into view.Due to the distance limitation between rotating shafts,part of the stator core and windings are cut off in the design of a dual-parallel rotor permanent magnet direct-driven motor,resulting in unbalanced rotor electromagnetic force.Therefore,this paper analyzes the inductance parameter asymmetry of the motor windings.Inductance parameters of the motor with windings pitch of 4 and 3 are calculated.On this basis,a mathematical model for the total electromagnetic force on the rotor is constructed,and the influence of each component force on the rotor’s total electromagnetic force is studied.Five optimization methods are proposed to optimize the electromagnetic force on the rotor:optimizing the duty angle,optimizing the coupling distance,adopting the asymmetric stator end structure,adopting the eccentric rotor structure,and eliminating part of the unit motors.Finally,the optimization effects of different methods on torque ripple are discussed.The advantages and disadvantages of different optimization methods are summarized,laying a foundation for studying dual-parallel rotor permanent magnet direct-driven motors.The following conclusions can be drawn:(1)The long-pitch coil of the modular structure may cause asymmetric three-phase inductance parameters.Three-phase inductance can be effectively balanced by reasonably selecting the winding pitch and the head end of the A-phase winding.(2)The electromagnetic force Ftotal on the rotor includes the electromagnetic force F1 between the stator with windings and the corresponding rotor,the magnetic force Fmag between two permanent magnet rotors in the coupling area,the force Fend between the core end and the rotor outside

关 键 词：双并列转子 永磁直驱电机 电磁力 优化方法 

分 类 号：TM351[电气工程—电机]