Prof. Hong Ji

vice president of Lanzhou University of Technology，China

Biography:

Ji Hong, received his PhD degree from Zhejiang University in 2004, and is currently a professor in Lanzhou University of Technology, Gansu, P.R. China. He is now the vice president of Lanzhou University of Technology and the director of Ministry of Education Key Laboratory for Advanced Pump, Valve and Flow Control Systems. In addition, he serves as a standing member of the Fluid Transmission and Control Branch of the Chinese Mechanical Engineering Society, and the vice chairman of Hydraulic Professional Committee. His research interests are basic research and application of modern hydraulic components, integrated electrohydraulic power units and hydraulic technology for construction machinery. He undertakes more than 30 finished and ongoing research projects, including the National Natural Science Fund, the National Key R&D Program Project, and industrial cooperation projects. He published more than 90 technical papers, and granted 30 National Invention Patents.

Keynote address: Wide-Speed Characteristic of Hydraulic Electric Motor-Pump

Electrohydraulic power units with zero-carbon emission have a very promising application in mobile machinery and industrial devices in electrified today. Improving the power density is the core of enhancing the competitiveness of electric equipment. The hydraulic electric motor-pump(HyEMP) that merged the separate motor and hydraulic pump into one is the most effective approach currently available. With the rapid development of high efficient wide-speed regulation technology for permanent magnet synchronous motor (PMSM), higher requirements are being placed on hydraulic pump. Particularly, broadening the speed range of hydraulic pump to keep PMSM working in high efficiency zone would dramatically save energy, and further reduce the dimension of HyEMP. However, insufficient filling, friction wear as well as other challenges for hydraulic pump at high speed may tend to occur.

This lecture will first explain the concept of HyEMP, along with a research status. A detailed introduction of our recent advances on a wide-speed HyEMP will follow shortly, including an oil-supplement method for internal gear pump by integrating a hollow-shaft centrifugal pump, and wear mechanism of friction pair. The report ends with plans for future work.