Abstract: A hyper-pressure control hydraulic system with direct electric drive was introduced to solve the shortages brought by the conventional hydraulic control system, which was based on the isostatic pressing equipment for producing high-quality diamonds and other superhard materials. It was used as a pressure compensation method mainly for the packing stage which was important to high-quality diamonds. The operational principles of this system was introduced, and the mathematical model was built. Main parameters of dynamic mechanisms and frequency charaeteristics of open loop of the system were analysed, and the influences of the main parameters such as effective area of hydraulic cylinder, effective volume of compresstion chamber and elastic stiffness of load on system characteristics were argued.

Key words: ultra-high-pressure, direct electric drive, pressure control, power mechanism

摘要： 提出一种适用于金刚石等超硬材料生产过程压机保压阶段的电动直驱式超高压力控制方式。该方式可实现精确的压力补偿，为人造金刚石晶体生长提供高精度的平稳压力，提高金刚石的品质等级。介绍了电动直驱式超高压力控制系统的工作原理,建立了相应的伺服动力机构的数学模型，并对动力机构的主要参数和系统开环频率特性进行了分析，指出了液压缸有效面积、压力腔有效体积以及负载弹性刚度等主要参数对系统特性影响的变化趋势。

关键词: 超高压, 电动直驱, 压力控制, 动力机构