Title: Characteristic analysis of pump controlled motor speed servo in the hydraulic hoister

Authors: Haigang Ding; Jiyun Zhao

Addresses: School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, 221116, China; Department of Mechatronic Engineering, Xuzhou College of Industrial Technology, Xuzhou, 221140, China ' School of Mechatronic Engineering, China University of Mining and Technology, Xuzhou, 221116, China

Abstract: To imitate the real hydraulic hoist used in mines and enhance its control performance, a pump controlled motor speed servo (PCMSS) is presented. Mathematic models of PCMSS with and without a position loop are established and their dynamic characteristics are studied by simulation and experiments. Results indicate that PCMSS without a position loop is susceptible to interrupt and uncontrollable only depending on the external motor speed closed-loop, whereas PCMSS with a position loop can achieve high stability and speed precision relying on the internal position closed-loop in the pump and the external speed closed-loop. Therefore, to achieve higher performances for PCMSS, the displacement of a variable delivery pump should be independently adjusted while motor speed is fed back and controlled in closed-loop. Based on this theory, two electrohydraulic servo control schemes are proposed for automation reform of traditional hydraulic hoisters.

Keywords: pump controlled motor speed servo; PCMSS; electrohydraulic servo control; position loop; hydraulic hoists; mine hoists; hoist control; mining; mathematical modelling; variable delivery pumps; pump displacement; motor speed; speed control.

DOI: 10.1504/IJMIC.2013.054038

International Journal of Modelling, Identification and Control, 2013 Vol.19 No.1, pp.64 - 74

Published online: 27 Sep 2014 *

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