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第三章三相交流液压系统3-1 三相交流液压系统的工作原理图(3-1)表示恒压三相交流液压伺服系统的工作原理,与一般直流伺服系统的区别是增加了交流部分。它包括三个部分:第一部分是直流能源部分,包括一般的变量泵,油滤,安全阀及油箱。第二部分是交流部分,包括交流阀,变压器及整流器。交流阀由液压马达带动,将直流变为三相交流。液压马达由直流部分的变量泵供油,靠频率控制阀(如节流阀)控制其转速,从而控制交流频率。由交流阀流出的三相交流,其相位差
Chapter 3 Three-phase AC Hydraulic System 3-1 Working Principle of Three-phase AC Hydraulic System (3-1) It shows the working principle of the constant voltage three-phase AC hydraulic servo system. Compared with the general DC servo system, the difference is that the AC part . It consists of three parts: The first part is the DC energy part, including the general variable pump, oil filter, safety valve and fuel tank. The second part is the AC part, including AC valves, transformers and rectifiers. AC valve driven by the hydraulic motor, the DC into three-phase AC. The hydraulic motor is fed by a variable-displacement pump in the direct-current section and its frequency is controlled by a frequency-controlled valve such as a throttle valve to control the AC frequency. By the exchange valve out of the three-phase AC, the phase difference