Research On Electromagnetic Mechanism And Performance Of Modular Splicing Braille Display Device

Braille has high cultural value as a means of transmitting information through tactile sensation in the fingertips.However,its low utilization rate has led to a growing information gap between visually impaired and sighted individuals.Intelligent Braille devices that can refresh in real-time provide visually impaired individuals with rich digital Braille books and to some extent,alter their learning and living habits.However,existing Braille devices face issues such as high cost and poor portability.Therefore,this paper proposes a module-splicing Braille display device based on electromagnetic action,verifies its structural rationality through electromagnetic theory calculation and simulation analysis,and conducts research on related performance such as touch refresh frequency,touch support force,and overall work temperature of the device’s practical prototype to verify its suitability as a Braille device for visually impaired individuals.The main contributions of this paper are as follows:Firstly,a single-point driving unit that presents Braille characters based on the design scheme and electromagnetic mechanism is constructed,and its structural design and dynamic analysis are carried out to obtain the electromagnetic action law of the driving unit.Through magnetic field analysis of magnetic components and research on electromagnetic action law,magnetic field action force and excitation coil parameters are theoretically calculated to obtain multiple sets of design parameters.Using Ansys Maxwell electromagnetic simulation software,electromagnetic action simulations are carried out under different parameters to obtain dynamic simulation curves of the permanent magnet core inside the driving unit,determining rational parameter values for the driving unit under limited conditions.Furthermore,simulation results are analyzed indepth to verify the self-locking and theoretical design feasibility under the working state of the driving unit.Based on this,a single-point display module that meets the requirements of Braille dot distance is designed with eight driving units combined in a 4×2 layout according to Braille shape requirements.The single-point display module includes three components:touch component,driving component,and socket component,and reasonable improvements and optimization are made to address issues with each component during the design process.Electromagnetic simulation is used to theoretically analyze the magnetic interference phenomenon between multiple driving units inside the single-point display module,analyzing dynamic simulation curves and magnetic field maps at various moments to confirm the reliability of the single-point display module to overcome its own electromagnetic interference and maintain normal operation.Finally,a physical prototype of the Braille display device is manufactured by combining multiple module splices and conducting experimental research on important related performance such as Braille presentation refresh frequency,touch support force,and device operating temperature.The prototype consists of a row of forty single-point display modules with dimensions of 350mm×40mm×30mm and a weight of approximately 1.5kg,providing excellent portability.The touch support force can reach160 m N,well above the pressure requirements for fingertip touch;the Braille dots are presented accurately,and the refresh frequency of the single-point display module is around 12 Hz.The device can update 1500 Braille characters within 30 seconds,with low power consumption.Under standard environmental conditions,the touchpad temperature is stable around 30℃ during long-term operation.The device’s working performance fully meets the needs of visually impaired individuals for tactile reading and achieves the expected design goals.