异步电机弱磁区转矩最大化策略  

Torque-maximizing field-weakening control of induction motors

作　　者：杨阳[1] 王庆年[1] 龚依民[2] 田恬 YANG Yang;WANG Qing-nian;GONG Yi-min;TIAN Tian(College of Automotive Engineering, Jilin University, Changchun 130021,China;College of Physics, Jilin University, Changchun 130012,China)

机构地区：[1]吉林大学汽车工程学院,吉林长春130021 [2]吉林大学物理学院,吉林长春130012

出　　处：《电机与控制学报》2017年第12期51-59,共9页Electric Machines and Control

基　　金：国家自然科学基金(21327803)

摘　　要：异步电机工作在弱磁区时,转矩随着转速的升高急剧下降,在转子磁场定向系统中,充分利用电机和逆变器的最大电压、电流限制,无需d轴电流控制器,通过调节q轴分量,稳定高速失步状态,实现弱磁区转矩最大化。异步电机在电压极限状态遇到干扰时,通过旋转定子电压矢量产生动态电压边缘,提高系统的瞬态响应。当异步电机运行在弱磁区,铁损增大,影响电机的磁链水平和转矩输出,引入铁损补偿机制,确保弱磁区的转矩最大化。仿真和实验证明,该控制系统能实现异步电机弱磁区转矩最大化,且具有很强的鲁棒性。When an induction motor operates in the field weakening ranges,the output torque reduces while the speed increases.How to get the maximum torque becomes the main target.Based on the control scheme of rotorfluxoriented,the proposed method fully exploited the machine and converter capabilities without the use of daxis current controller.Maximum torque production in a higher speed range of field weakening was achieved by stabilizing the operating point at the pullout point through the qaxis component of the current applied across the stator.Operation at the voltage limited to dynamic changes,a temporary voltage margin was therefore created in a dynamic condition by deviating the trajectory of stator voltage vector which improved the transient response of the system.Iron losses,which are traditionally ignored in the vector control scheme,increased rapidly in the high speed ranges and affected the magnitude of rotor flux and output torque.The compensation of iron losses is necessary to ensure the torque maximized.Simulation and experiments results prove that the proposed scheme provides good performance on the steadystate and transient,and get the torque maximized in the field weakening ranges.

关 键 词：异步电机 弱磁 转矩最大化 瞬态响应 铁损 

分 类 号：TM343[电气工程—电机]