【摘要】 对比了常用的几种异步电机定子磁链的观测方法,针对纯积分环节及一阶惯性环节模型的直流偏置和相移问题,以及低速下磁链电压模型观测结果受定子电阻变化影响较严重的问题,引入了电流模型对电压模型进行补偿,提出了一种基于截止频率及增益可变的串联低通滤波器的新型电压?电流磁通观测模型。仿真及实验结果表明,该模型在较宽的调速范围内具有较好的磁链估计效果及对定子电阻变化的鲁棒性。更多还原

【Abstract】 Several kinds of methods in stator flux observation of induction motor are compared. As the DC offset and phase lag problem are caused by a pure integrator or a single-stage low-pass filter. The problem of voltage model of flux estimation is disturbed by variation of stator resistance particularly in the low-speed range. The current model is introduced to compensate the voltage model. It is suggested that a novel voltage-current flux observation model based on cascaded low-pass filter with programmable cut-off frequency and gain. The results of simulation and experiment validated the new model by a preferable flux estimation effect and robustness under variation of stator resistance in whole-speed range.更多还原