文章还分析了电机制动时能量的回馈和直流侧母线电压的变化，以及直流电压变化对系统的影响。
The change of DC voltage in braking process and its effect on system and feedback energy are analyzed.
本文介绍了一个控制桥式起重机的变频调速系统，它根据桥吊的特殊性能要求，采用矢量控制方式，具备平滑调速、能量回馈、顺序制动等功能。
According to the special requires of bridge crane, it adopts the vector control theory, has functions of regulating speed smoothly, energy feed back, sequence brake etc.
以电流给定，脉宽调制(PWM)调压调速系统为例，研究各种制动状态下的能量回馈过程。
Based on given electric current and Pulse Width Modulation (PWM) controlling system, the feedback process under each braking condition is studied.
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