Abstract : Based on the analysis of the requirements for developing a wide-format color inkjet plotter, a drive design scheme for its printhead carriage is proposed. This scheme consists of a DC linear motor controlled by an LMD18245 chip, a linear capacitive displacement sensor, and a digital PID control algorithm forming a closed-loop control system. After detailed design and careful debugging, practice has proven that the scheme is fully valid, and the performance indicators of the carriage drive fully meet the requirements. Keywords : Inkjet plotter; Capacitive sensor; Linear motor With the continuous development of printing technology, the market demand for large-format, high-quality inkjet products is increasing, and wide-format color inkjet plotters have become an important direction for development and market competition. To produce high-quality inkjet products, the plotter's design, from the overall structure to each component, has strict requirements. The author participated in a plotter R&D project, responsible for the drive design of the printhead carriage. The main task of this part is to control the movement state of the carriage, thereby driving the printhead to the target position for printing. Its design level and performance directly affect the overall performance indicators of the plotter. The performance requirements of this plotter are: effective area 80 inches, 6 colors, resolution 720dpi, printing speed 4m2/h (normal mode), and 3 printing modes: draft, normal, and high precision. These indicators have reached the international advanced level. 1 Overall Design Based on the above specific requirements for the control of the carriage, the following technologies are proposed: (1) The carriage movement is driven by a linear DC servo motor. Its advantage is that it does not require intermediate transmission links, avoids position errors caused by transmission chains, and improves displacement accuracy. (2) The speed feedback system adopts a linear capacitive displacement sensor. The actual position feedback of the printhead is used to overcome the positioning error caused by speed fluctuations. (3) The entire control system adopts a closed-loop control. In order to make the carriage run smoothly, a speed negative feedback closed-loop control is adopted. In the application of single-chip microcomputers, the control algorithm commonly used is the digital PID algorithm, which is mature and easy to apply. [b][align=center]For details, please click: Drive Design of Printhead Carriage of Inkjet Plotter[/align][/b]