When the acceleration period has terminated, the switch means is controlled by a PWM pulse of the duty ratio in accordance with the speed instruction data, there by driving the DC motor.
在该加速期间结束时，以占空比与速度指令数据对应的PW M脉冲来控制开关机构，从而驱动该直流马达。
To select and remove from a set of items those items that meet some criteria, for example, to obtain certain specified digits from a computer word as controlled by an instruction or mask.
例如，在计算机指令或掩码的控制下，从计算机字里获取某些指定数字。
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