工作本质：直流电机内部包含电枢线圈与永磁体。当电枢通入直流电流时，在安培力作用下产生电磁转矩驱动转子旋转。输出扭矩与电流成正比：$\tau = K_t \cdot I$； 为什么 FPGA 绝对不能直连电机？ 驱动能力极其有限：FPGA 的普通 I/O 引脚（如 LVCMOS33）最大驱动 ...

你有没有想过这样一个问题：明明直接伸手就能够到门板， 我们为什么非要抬起手来敲门呢？ 很多人会把这个行为归为礼貌、习惯，或约定俗成。但你可能不知道：抬手敲门其实更省力！每一次敲门，我们都在无意识地薅重力的羊毛。 是什么决定了敲门响不响？

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