The Optimal Design Of Motor Control System For Fdm 3D Printer

As a new type of technology and equipment,the 3D printer based on fused deposition technology in the community has been widely recognized and concerned.Due to the late start of domestic FDM(Fused Deposition Modeling)3D printers,the motor control algorithm and circuit stability still have a very large development space.Therefore an optimal design scheme is presented to improve the performance and stability of the motor control system for FDM 3D printer.Based on the idea of modular and hierarchical designing,the overall design scheme of the hardware platform and the software control system are established in the paper.After the functional requirements analysis of the system,the hardware circuit platform based on Cortex-M4 microcontroller and the software control system based on real-time operating system RT-Thread are devised.The hardware circuit design not only implements the chip selection and circuit design of each function module,but also completes the drawing and welding of the PCB circuit board.For the purpose of increasing the stability of the system operation and avoiding the mutual interference of the hardware circuit design,hardware platform of the system adopts the modular circuit design and optimizes the power supply module.According to the porting of real time operating system RT-Thread,the overall operation process of the software control system are studied and analyzed.Besides,the paper achieves the software implementation of the data storage function,human-computer interaction function,serial communication and debugging function,stepper motor drive control function.Aiming at further boost printing performance and stability of the system,this paper realizes a converged application in the stepper motor drive control system,which combines the S acceleration and deceleration control algorithm and the Bresenham linear interpolation algorithm.On the basis of fundamental function,this paper completes the verification analysis about the performance of hardware circuit and the operation results of software system.In addition,the performance and stability of the system are verified by the multi group print test of the simple models and the long time print test of the complex models.The results demonstrate that not only the printing performance of FDM 3D printer has been enhanced,but also the stability of the system operation has been greatly improved.