Abstract: The non-synchronous transmission in high-speed gantry-moving milling machining center is studied. A cross-coupled controller based on H state feedback is proposed to compensate for the speed loop, enabling it to quickly recover to the synchronous state under unbalanced loads or different disturbances. A linear permanent magnet synchronous motor is used as the drive element to leverage its high-speed dynamic response capability and further achieve rapid synchronization. Simulation results show that this control scheme has strong robustness and small synchronization error in the dynamic process. Keywords : Robust control; Synchronous rotation; Linear motor; Gantry-moving milling machining center This paper presents a state feedback controller to build cross-coupled controllers for velocity loop compensation and control, which can rapidly restore synchronous state under unbalanced loads or various disturbances. Linear permanent magnet synchronous motors (LPMSMs) are used as driving parts to bring their high-speed dynamic response ability into play for further realizing rapid synchronism. Simulation results indicate that the proposed scheme has strong robustness and lower synchronous error during dynamic processes. Key words: Robust control; synchronous drive; linear motors; gantry-moving type milling machining center [b] 0 Introduction[/b] With the development of high-speed and high-precision boring and milling technology, it is often necessary to process large integral parts and geometrically complex surfaces. Traditional gantry boring and milling machines have fixed gantry columns and the worktable feeds longitudinally along the guide rail. Due to the large weight of the moving parts of the machine tool, it is difficult to obtain high acceleration, which is far from meeting the requirements for high-speed machining of large and complex surfaces. [b][align=center]For details, please click: High-Precision, Fast Synchronization Based on H Robust Controller[/align][/b]