NDLI: An Approach to Digital Distributor Valves in Low Speed Pumps and Motors

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Chapple, Peter Per, N. Lindholdt Henrik, B. Larsen
Copyright Year	2014
Abstract	This paper presents a novel approach to digital pumps and motors with electronic controlled valves for each working chamber in positive displacement machines. The approach is focused on low speed operation of hydraulic pumps and motors. When applied to High Torque Low Speed radial piston units with eccentric shaft it offers increased efficiency, increased power capacity, more compact design, displacement control and a number of other control features. The proposed valve system has out-wards opening poppet-type valves on both the high- and low pressure side. This solution allows for a symmetric valve arrangement, enabling the units to operate as traditional motors/pumps with traditional distributor valves as well as to be used in simplified system layouts where full advantage is taken of the technology. This is opposed to current solutions having poppet type valves opening inwards on the low-pressure side and outwards on the high-pressure side, requiring dedicated high- and low pressure ports, also on motors. New opportunities and challenges are discussed, among which are four quadrant operation, displacement variation, start and stop, valve timing, overpressure protection and valve actuators.
Sponsorship	Fluid Power Systems and Technology Division
File Format	PDF
ISBN	9780791845974
DOI	10.1115/FPMC2014-7861
Conference Proceedings	ASME/BATH 2014 Symposium on Fluid Power and Motion Control
Language	English
Publisher Date	2014-09-10
Publisher Place	Bath, United Kingdom
Access Restriction	Subscribed
Subject Keyword	Torque Motors Valves Pressure Machinery Displacement Overpressure protection Design Pistons Valve actuators High pressure (physics) Hydraulic pumps Gates (closures) Pumps
Content Type	Text
Resource Type	Article

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