For the traditional hydraulic power system driven by the asynchronous motor(ASM) has some defects in practical applications such as low efficiency, slow response and instability at low-speed, this paper researched a new energy-saving hydraulic power system based on the permanent magnet synchronous motor(PMSM) which had good performance in energy-saving and speed regulation and the gear pump which had good performance in reliability.And an experimental system was designed under the guidance of energy-saving and frequency control theory. The experimental results prove the feasibility of such a power source, show some unique system performance and technical advantages,and show that the hydraulic power driven by the PMSM is better than the hydraulic power driven by the ASM in power matching of the load, response time and speed regulation precision,especially in the energy-saving of the low-speed and light load.

针对传统异步电机驱动液压动力源在实际应用中存在的效率低、响应速度慢以及低速调节性能不稳定等缺陷,将永磁同步电机节能、调速性能好与齿轮油泵不能调速但可靠性好的技术特点相结合,提出了一种节能型液压动力源,并在节能和变频调速理论指导下设计开发了实验系统,实验结果表明所研究的动力源具有可行性,而且该动力源还表现出一些特有的系统性能和技术优势。实验结果还表明：所提出的液压动力源在负载功率匹配、响应速度、调速精度等方面均优于异步电机驱动的液压动力源,在低速轻载时节能效果尤为显著。

 

永磁同步电机, 液压动力源, 功率匹配, 节能调速

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