Automated design and analysis of a variable displacement linkage motor

Nathaniel J. Fulbright, Grey C. Boyce-Erickson, Thomas R. Chase, Perry Y. Li, James D. van de Ven

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Hydrostatic drives consisting of a variable displacement pump and a low speed high torque (LSHT) motor are frequently used in off-highway vehicles. A variable displacement traction motor is desirable because of the ability to downsize the pump and thereby run the hydrostat at higher efficiency, as well as the possibility of hybridization of the drivetrain. Currently on the market are fixed and discrete speed LSHT radial piston motors and high speed low torque variable displacement axial piston motors. The radial piston motors are displacement dense but are not continuously variable, whereas the axial piston motors are continuously variable but require gearboxes, introducing packaging and robustness concerns. The Variable Displacement Linkage Motor (VDLM) is a LSHT motor that is continuously variable. It offers several benefits over current LSHT motors in that it is highly efficient over its operating range, it has low torque ripple, and it is displacement dense due to its multi-lobed cam and radial packaging. As with the design of any motor, the process is iterative and must be performed whenever performance objectives change. This paper describes an automated method for rapid exploration of the solution space for a variable displacement motor with specific application to the VDLM. This method leads to a motor design that theoretically can achieve 97% efficiency with a torque ripple below 5% at full displacement.

Original languageEnglish (US)
Title of host publicationASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Electronic)9780791859339
DOIs
StatePublished - Jan 1 2020
EventASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019 - Longboat Key, United States
Duration: Oct 7 2019Oct 9 2019

Publication series

NameASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019

Conference

ConferenceASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019
CountryUnited States
CityLongboat Key
Period10/7/1910/9/19

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Fulbright, N. J., Boyce-Erickson, G. C., Chase, T. R., Li, P. Y., & van de Ven, J. D. (2020). Automated design and analysis of a variable displacement linkage motor. In ASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019 (ASME/BATH 2019 Symposium on Fluid Power and Motion Control, FPMC 2019). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/FPMC2019-1677