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| 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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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.
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Published: 16 January 2018
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| Fund:国家自然科学基金资助项目（51507055） |
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Corresponding Authors:
刘 庆 男,1972年生,博士,高级工程师,主要研究方向为电机设计及电机控制。E-mail: qliu777@sina.com
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2017, Vol. 32 
