Thermal Characteristic and Analysis of Electro-Hydrostatic Actuator

Electro-hydrostatic actuators (EHAs) are widely utilized due to their superior integration and high power-to-weight ratio. However, the elimination of a centralized oil source in EHAs restricts the cooling capacity of the system, leading to potential adverse effects on performance and longevity caused by excessively elevated temperatures. This study meticulously investigates the power loss during energy transfer and the heat dissipation properties of EHAs. To further study the heat behavior, a one-dimensional simulation model of the EHA thermal-hydraulic system is developed. By comparing the simulation results with experimental data obtained from an actual EHA system, the good agreement between the simulation and experimental results confirms the accuracy of the model in predicting the thermal performance of EHAs. Based on the validated model, different cooling schemes for EHAs is further explored. The cooling mechanisms of air cooling and phase change heat dissipation are considered to enhance heat dissipation and manage the temperature rise within the EHA. This study provides insights and guidance for the early-stage thermal design of EHAs, aiming to optimize system performance and prolong its operational life.