Design and Analysis of a Novel Impact- Resistant Electro-Mechanical Actuator With Disc Spring Compression and Hydraulic Buffering Mechanism

The electro-mechanical actuator (EMA) is being recognized as the preferred linear drive mechanism in fields such as aerospace, robotics, and industrial automation. However, it faces a technical challenge of poor impact resistance. This article proposes and designs a novel impact-resistant EMA (IR-EMA) that incorporates a disc spring compression compliant mechanism. The mechanism is positioned between the electro-mechanical transmission mechanism and the end output mechanism, eliminating the rigid coupling relationship between them. Additionally, a hydraulic buffering system is introduced to resist impact loads, reducing the impact force within the electro-mechanical transmission mechanism. Building upon theoretical analysis and structural design, this article develops hydraulic buffering and compliant driving control strategies. Finally, a prototype of the IR-EMA is fabricated and tested to validate its performance. Comparative experimental results demonstrate that, under identical sudden load impact conditions, the peak impact force of the electro-mechanical transmission mechanism is reduced by more than 52% compared to traditional EMA, and the larger the hydraulic output force, the smaller the peak force, indicating a significant impact resistance effect.