简要分析了良好的功放系统应具备的条件，介绍了一种三相交流进给驱动装置及其在伺服中的应用，在相同条件下把该装置与传统功放系统进行了说明了它能够提高伺服系统性能的原因。‘

The paper analyzes the condition that a fine power amplifier system should have, introduces a new kind of three-phase AC drive device applying in servo system and comparing it with the traditional power system in the same conditions. The reason that can improve the performance of servo system is proved.

TN952 TN957