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Updated: Jun 13, 2026

Modeling and Experimental Analysis of the Single-Shaft Coaxial Motor-Pump Assembly in Electrohydrostatic Actuators
Published on: June 13, 2022
Note: Development of a compact electromagnetic hydraulic pump for a microrobot joint driving system
Naijian Chen1, Sun'an Wang, Jinhua Zhang
1School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, People's Republic of China. chnjian@hotmail.com
Abstract:
This note describes a compact electromagnetic hydraulic pump (EMHP) designed primarily to build a microdriving system for a robot joint actuator. A characteristic mathematical model integrating electricity, magnetism, and hydraulics is constructed to represent the working process of the EMHP. Tests show that a volumetric flow rate of up to 430 cm(3)/min and load pressure of up to 2.5 MPa can be achieved. The prototype pump can supply stable pressure of 0-2.4 MPa and acceleration of 1.2 MPa/s for the robot joint actuator.
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