Affiliations: [a] College of Mechanical and Vehicle Engineering, Hunan
University, Changsha, Hunan, China | [b] The State Key Laboratory of Fluid Power Transmission
and Control, Zhejiang University, Hangzhou, Zhejiang, China
Correspondence:
[*]
Corresponding author: Tao Wang, College of Mechanical and
Vehicle Engineering, Hunan University, Changsha, Hunan, China. Tel.: +86 571
879 513 14 8108; Fax: +86 571 879 519 41; E-mail: twang001@126.com
Abstract: Electro-hydraulic power units are key components of hybrid driven
mobile machines such as forklifts and excavators. To satisfy the requirement of
limited installation space, this paper proposes a compact and reversible
electro-hydraulic energy conversion unit which is the integration of an axial
piston hydraulic pump/motor and an electrical machine excited by a segmented
Halbach permanent magnet array. The magnets are fixed on the surface of a
barrel so that the hydraulic rotor and the electrical rotor are integrated
together. Analytical and numerical methods are used to investigate the coupling
issues including the common rotor's effect on flux density distribution,
combined torque ripple, flow and energy losses in the oil gap, and some design
criteria are presented to provide further development with references.
Keywords: Electro-hydraulic, structure integration, halbach array, energy conversion, coupling effect
