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永磁同步电机精确瞬时速度检测

, PP. 71-76

Keywords: 永磁同步电机,瞬时速度观测器,扰动转矩,同步采样,异步采样,惯量辨识

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Abstract:

提出了一种利用低分辨率光电编码器实现高精度的永磁同步电机瞬时速度检测方法。首先,根据永磁同步电机运动模型建立瞬时速度观测器,对电机的瞬时速度和扰动转矩进行估计;再根据电机的不同运行速度,对编码器位置信号进行同步或异步采样,获得电机转子的准确位置;然后利用位置检测值对瞬时速度观测器的估计值进行校正。为了降低负载惯量变化对速度观测器的影响,利用电机瞬时速度和扰动转矩的估计值对负载惯量进行自动辨识,并根据辨识结果对瞬时速度观测器的参数进行在线调整。与传统速度观测器相比,该方法减小了位置检测误差和滞后时间,提高了瞬时速度检测精度,尤其是当电机低速运行时,速度检测精度得到明显改善。

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