一种异步电机弱磁控制方法仿真分析

Simulation of a Field Weakening Control Method for Asynchronous Motorr

异步电机由于具有低成本、可靠性高等优点,得到了广泛的应用。然而,当异步电机需要运行至额定转速以上时,就需要采用弱磁控制方法。笔者建立了异步电机的数学模型,分析了异步电机弱磁升速原理,并提出了一种基于速度函数和电压环的励磁电流给定方法,通过仿真验证了所提方法的有效性。仿真结果表明:本方法通用性较强,各运行区间电流过渡平稳,对提高异步电机转矩输出能力具有显著改善作用。

Asynchronous motors have been widely used due to the low cost and good reliability.However,when the asynchronous motor needs to run above the rated speed,it needs to adopt the field weakening control method.The author establishes the mathematical model of the asynchronous motor,analyzes the principle of asynchronous motor field weakening,and proposes a method of set the excitation current based on the speed function and voltage loop.The effectiveness of the proposed method is verified by simulation.The simulation results show that the method is universal and the current transition is smooth,which can improve the torque output capability of asynchronous motor significantly.