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research-article

DESIGN OF A CRANK-SLIDER SPOOL VALVE FOR SWITCH-MODE CIRCUITS WITH EXPERIMENTAL VALIDATION

[+] Author and Article Information
Shaun E. Koktavy

MS Student, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA 55455
kokta002@umn.edu

Alexander C. Yudell

PhD Student, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA 55455
yudel004@umn.edu

James D. Van de Ven

Associate Professor, Department of Mechanical Engineering, University of Minnesota, Minneapolis, MN, USA 55455
vandeven@umn.edu

1Corresponding author.

ASME doi:10.1115/1.4038537 History: Received January 03, 2017; Revised November 02, 2017

Abstract

A challenge in realizing switch-mode hydraulic circuits is the need for a high-speed valve with fast transition time and high switching frequency. The work presented includes the design and modeling of a suitable valve and experimental demonstration of the prototype in a hydraulic boost converter. The design consists of two spools driven by crank-sliders, designed for 120 Hz maximum switching frequency at a flow rate of 22.7 lpm. The fully open throttling loss is designed for <2% of the rated pressure of 34.5 MPa. The transition time is less than 5% (0.42 ms at 120 Hz) of the total cycle and the duty cycle is adjustable from 0-1. Leakage and viscous friction losses in the design are less than 2% of the rated hydraulic energy per cycle. The experimental results agreed well with the model resulting in a 3% variation in transition time. The use of the high-speed valve in a pressure boost converter demonstrated boost ratio capabilities of 1.08-2.06.

Copyright (c) 2017 by ASME
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