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基于反电动势技术的位置估计根据电压和电流估计磁通和速度,这对低速范围内的定子电阻特别敏感。由于机器的反电动势小和开关器件非线性特性产生的系统噪声,几乎无法检测到机器终端上的实际电压信息。反电动势方法在中高速和高速区域产生良好的位置估计,但在低速区域失败。
反电动势电压的大小与转子速度成正比;因此,在静止状态下,无法估计初始位置。因此,从未知的转子位置启动可能伴随着暂时的反向旋转或可能导致启动失败。由于EKF能够对涉及随机噪声环境的非线性系统进行状态估计,因此对于PMSM的速度和转子位置的在线估计,EKF似乎是一种可行且计算候选者。
基于使用磁显著性的空间显著性跟踪的技术适用于零速运行,并且可以在没有参数影响的情况下估计初始转子位置。对于转子初始位置,主要有两种基本方法,基于使用脉冲信号注入或正弦载波信号注入。让我们看一个例子。
GE Fanuc AC Servo Motor A06B-0314-B567 #27299
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