该调速系统以电压负反馈代替转速反馈，形成闭环控制，以比例积分调节器实现无静差调速，具有良好的性能。

It can research PWM regulating speed. In the system, voltage feedback instead of speed feedback, PI regulating no steady-state error. So it has a good dynamic and steady performance.

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这样不仅可以做到速度的实时反馈和调整，而且由于PI调节器的积分作用，可以使系统在稳态时做到速度无静差。

So it not only achieves the real-time feedback and the regulation of speed but also eliminate the static error of speed due to the integral action of PI regulator when the system is in a steady state.

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