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UPD78F1142AGA-HAB-AX
UPD78F1142AGB(A)-GAH-AX
UPD78F1142AGB-GAH-AX
UPD78F1142AGK(A)-GAJ-AX
UPD78F1142AGK-GAJ-AX
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（齿槽）转矩特性测量法转子使用**磁铁的步进电机，定子线圈没有通电流时，转子如旋转也会产生转矩。此时，**磁铁产生的转矩称为齿槽转矩或转矩。此转矩用感应计和编码器方法测量，但齿槽转矩只有静态转矩的10%，所以要改变转矩计的测量范围。为得到准确的测量数据，步进电机、编码器、转矩传感器的同轴度要好，考虑使用可拆卸的连轴器，要注意不要产生摩擦转矩。上两转矩特性图为被试步进电机的静态转矩特性，由于其齿槽转矩过小，静态转矩与齿槽转矩如同时表示，则齿槽转矩对θ、τ的影响很不明显。