车用异步电机的一种最佳响应性能整定方法

异步电机的转子磁链定向矢量控制具有自然解耦的特点,正确解耦有助于车用异步电机获得最大电磁转矩的需 求,只是解耦需要准确的电机参数。通过分析转差频率与转子时间常数的关系,及当转子时间常数不准确时的转矩变化 趋势,文章提出了一种整定方法,不追求参数和解耦的准确性,而以“最大加速度／转矩电流”为目标。先通过离线辨识 得到定子参数,据此估算额定励磁电流值和转子参数的搜索初值,再通过实际电机的最快响应来搜索不同转矩电流下对 应的转子时间常数的函数关系。在基于TMS320F28069搭建的驱动系统上进行了实验。实验结果表明,电机的加速性 能与控制算法中的转子时间常数密切相关,当转矩电流与此转子时间常数满足一定的函数关系时,单位电流的转矩达到 最大,电机的加速性能最优。研究有助于提高车用异步电机的加速性能。

Best Response Setting Method of Induction Motor for Electric Vehicle

Induction motor rotor flux oriented vector control has the characteristic of natural decoupling. Correct decoupling helps to gain maximum electromagnetic torque for vehicles using induction motor, but the decoupling is based on accurate motor parameters. By analyzing the relationship between slip frequency and rotor time constant, and also rotor time constant and torque, this paper puts forward a method, which does not pursue the accuracy of the parameters and the decoupling but takes " maximum acceleration/torque current ratio" as its goal. Firstly stator parameters were obtained by off-line identification, which was used to estimate the rotor excitation current value and initialize the rotor parameters; then the function relationship between q-axis current and torque rotor time constant was searched through the fastest response of actual drive. An experiment had been carried out on a drive system with TMS320F28069 as control core. The experimental results showed that the acceleration was closely related to the rotor time constant of the control algorithm, if the rotor time constant and q-axis current met a certain function relation, unit current produced maximum torque and drive got optimal acceleration performance. This method is helpful to improve the acceleration performance of induction motor.