笼型感应电机转子轴向分段错开结构削弱同步附加转矩的研究  

Research on the Reduction of Synchronous Parasitic Torque by the Rotor Axial Piecewise Staggered Structure of Cage Induction Machine

作　　者：徐威 任晓明[1] 宁银行[1] 鲍晓华[2] Xu Wei;Ren Xiaoming;Ning Yinhang;Bao Xiaohua(School of Electrical Engineering Shanghai Dianji University,Shanghai 201306 China;School of Electrical Engineering and Automation Hefei University of Technology,Hefei 230009 China)

机构地区：[1]上海电机学院电气学院,上海201306 [2]合肥工业大学电气与自动化工程学院,合肥230009

出　　处：《电工技术学报》2023年第20期5411-5420,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51977055);安徽省科技重大专项(201903a05020042)资助项目。

摘　　要：特定槽配合感应电机输出转矩与电机起动位置有关。为抑制转矩随起动位置周期变化引起的转矩波动,提出一种削弱同步附加转矩的轴向分段错开转子结构。建立电磁转矩计算模型,推导关于转子初始位置的转矩幅值表达式,确定产生恒定转矩的磁场阶次和电机转速条件。基于磁动势线性分布假设,探讨转子分段错开结构减小谐波电动势的机理,量化同步附加转矩削弱程度与转子错开段数的关系。以四种特殊槽配合为例,仿真分析单斜槽转子、分段错开转子及两者组合结构转子,对电机基波转矩和同步附加转矩的影响。最后,选择等槽配合方案试制双斜槽转子样机,开展电机堵转转矩和空载特性试验。结果表明,转子分段错开结构有效削弱了同步附加转矩,解决了等槽配合感应电机起动困难的问题,为抑制电机转矩波动和槽配合选取方法的研究提供了理论参考。The smoothness and stability requirements of motor output torque have gradually increased in recent years,especially in emerging applications such as electric vehicles.The induction machine(IM),due to its low price,high reliability,and strong overload capacity,still has certain competitive advantages and application needs.In classical motor design theory,the range of slot combinations is limited to ignore the large synchronous parasitic torque,such as the equivalent slot combination.However,the stray loss of IM is small when the number of stator slots and rotor slots is similar.For some of these special slot combinations,the output torque of the induction machine is related to the starting position of the motor.In order to suppress the torque ripple caused by the periodic torque variation with the starting position,a rotor axial piecewise staggered structure is proposed to weaken the synchronous parasitic torque.The selection range of slot combinations can be expanded by solving the starting difficulty of the IM with an equivalent slot combination.The electromagnetic torque calculation model is established,the torque amplitude expression about the initial rotor position is deduced,and the magnetic field order and the motor speed conditions for generating constant torque are determined.Based on the assumption of the linearly distributed magnetic potential,the mechanism of weakening the harmonic electromotive force is discussed using a piecewise staggered rotor structure.The relationship between the weakening degree of synchronous parasitic torque and the number of staggered rotor segments is quantified.Taking four kinds of special slot combinations as examples,the effects of the single skewed rotor,the piecewise staggered rotor,and the rotor with the combined structure on the fundamental torque and synchronous parasitic torque are simulated and analyzed.Finally,the dual skewed rotor prototype machines are trial-produced with the equivalent slot combination scheme,and the motor locked-rotor torque tests are carried

关 键 词：轴向分段错开转子 同步附加转矩 转矩波动 槽配合 感应电机 

分 类 号：TM343[电气工程—电机]