1769-RTB40AIO

1769-RTB40AIO

牵入转矩（Pull-in Torque）特性

“牵入转矩特性”也称为“启动转矩特性”，表示可以使停止状态的步进电机启动的频率（脉冲频率）与负载转矩之间的关系。牵入转矩曲线内的区域称为“自启动区域”，是可以启动、停止和反转的区域。另外，将负载转矩为零的频率＝可以启动步进电机的极限频率称为“大自启动频率”。如图所示，频率越高，可启动的负载转矩越低。

■失步转矩（Pull-out Torque）特性

“失步转矩特性”也称为“连续特性”或“牵出转矩特性”。表示在自启动后增加负载转矩时可以继续旋转的频率。因此，其值高于牵入转矩特性的值。步进电机可以连续运行的极限称为“大连续运行频率”。与牵入转矩特性一样，失步转矩特性也是负载转矩会随着脉冲频率的增加而降低。

■保持转矩（Holding Torque）

步进电机在通电状态下，在步进电机停止时即使施加外力，电机也试图通过转子与定子之间的吸引力来保持停止位置，这种保持力称为“保持转矩”。在上图中，即工作频率（脉冲频率）为零、也就是停止状态下的转矩。

顺便提一下，步进电机的转矩之所以随着工作频率的增加而减小，是因为受绕线电感影响，电流难以在高频条件下流动。

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