平行式要求伺服系统具有良好的速度稳定性，保证恒定的速度输出。

And that parallel mode requires the servo system to have good speed stability to ensure invariable output of speed.

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在相应的工况点下，伺服系统能保证良好的动态性能和稳定性。

These servo systems can guarantee good performance and stability at local operating points.

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通过与模拟交流伺服系统的比较，说明了全数字交流伺服系统可编程能力强、系统稳定性好、系统性能提高等特点。

By comparison with analogue AC servo system, some remarkable features of digital AC servo system, such op programming function, system stability and system performance are described.

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