电工技术学报2017，Vol.32Issue(24)：30-41,12.DOI:10.19595/j.cnki.1000-6753.tces.160739
电动汽车用异步电动机低速转矩最大化
Torque Maximization about Electric Vehicle Induction Motor at Low Speed
摘要
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.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Key words
Induction motor/electric vehicle (EV)/magnetizing inductance/optimization model/saturation/nonlinearity/space vector pulse width modulation (SVPWM)分类
信息技术与安全科学引用本文复制引用
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):30-41,12.基金项目
国家自然科学基金资助项目(51507055). （51507055）
