电工技术学报  2017, Vol. 32 Issue (24): 30-41    DOI: 10.19595/j.cnki.1000-6753.tces.160739
电机与电器 |
电动汽车用异步电动机低速转矩最大化
刘庆1, 刘和平1, 刘平2, 郭强3, 苗轶如1
1. 输配电装备及系统安全与新技术国家重点实验室(重庆大学) 重庆 400044;
2. 湖南大学电气与信息工程学院 长沙 410082;
3. 重庆理工大学电气与电子工程学院 重庆 400050
Torque Maximization about Electric Vehicle Induction Motor at Low Speed
Liu Qing1, Liu Heping1, Liu Ping2, Guo Qiang3, Miao Yiru1
1. State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing 400044 China;
2. College of Electrical and Information Engineering Hunan University Changsha 410082 China;
3. School of Electrical and Electronic Engineering Chongqing University of Technology Chongqing 400050 China
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摘要 电动汽车用异步电动机经常会遇到爬坡等低速重载运行工况,特别对于低压大电流的交流异步电动机,在逆变器电流限制条件下实现转矩最大化非常重要。以电机稳态电路为基础,建立电流约束条件下基于非线性励磁电感的低速转矩最大化模型。模型分析表明该最优问题可以简化为一维搜索问题,并采用经典的搜索算法在低速范围进行求解。实际电机计算结果和理论分析表明,整个低速范围内最大转矩值工作点的转矩值、齿部磁通密度、转差率几乎保持恒值,相当饱和的磁场导致严重的非线性。非线性励磁电感应用于改进的空间矢量控制系统,实现大电流约束条件下低速转矩最大化运行,仿真结果表明控制方法的正确性。实验结果也验证了转矩优化模型、模型分析结论及改进的空间矢量控制方法的正确性。
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刘庆
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关键词 异步电动机电动汽车励磁电感优化模型饱和非线性空间矢量脉宽调制    
Abstract:Induction motor for electric vehicle (EV) often encounters low speed and heavy load conditions such as climbing slope. In such cases, the maximum torque constrained by inverter current is very important, especially for low voltage and large current induction motor. From steady circuit of induction motor a current constrained torque maximization model was constructed based on a nonlinear magnetizing inductance. Analysis of this model indicates that the optimization problem can be simplified into a one-dimension searching problem. A classical searching method was used to get the solutions in low speed range. The calculation results of an actual induction motor and theoretical analysis show that the torque, teeth flux density and slip frequency of all the torque maximization points nearly keep constant, and the fairly saturated magnetic field results in severe nonlinearity. When the nonlinear magnetizing inductance is applied to an improved space vector pulse width modulation (SVPWM) control system, the maximum torque under large current constrained condition can be implemented. The simulation and experimental results verify the optimization model, analysis results and the improved SVPWM.
Key wordsInduction motor    electric vehicle (EV)    magnetizing inductance    optimization model    saturation    nonlinearity    space vector pulse width modulation (SVPWM)   
     出版日期: 2018-01-16
PACS: TM343  
作者简介: 刘和平 男,1957年生,教授,博士生导师,主要研究方向为电力传动及其控制技术。E-mail: engineer@cqu.edu.cn
引用本文:   
刘庆, 刘和平, 刘平, 郭强, 苗轶如. 电动汽车用异步电动机低速转矩最大化[J]. 电工技术学报, 2017, 32(24): 30-41. Liu Qing, Liu Heping, Liu Ping, Guo Qiang, Miao Yiru. Torque Maximization about Electric Vehicle Induction Motor at Low Speed. Transactions of China Electrotechnical Society, 2017, 32(24): 30-41.
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