capstan speed PWM

例句：

1. 1. The car's engine is running at a high capstan speed.
   汽车的发动机以高速运行。
2. 2. The generator was set to a high capstan speed for maximum power output.
   发电机被设置为高速度以获得最大输出功率。
3. 3. The racecar needs to be adjusted to its optimal capstan speed for the next lap.
   赛车需要调整到最佳转速以便进行下一圈。