A Synchronous Control System For Lifting Platform

Dual-motor and multi-motor platform control systems have the advantages of strong adaptability,high power and low cost,and are widely used in production,processing and life.The synchronous control performance between motors directly affects the stability and production efficiency of power equipment,such as lifting processing platforms,machine tools and other equipment.The worse the synchronous control performance is,the lower the system stability will be,and even the equipment will be damaged.In this paper,a lifting platform system based on dual-motor DC synchronous control is designed.The simulation model established by using MATLAB tool includes motor mathematical modeling,current loop design and speed loop design,and the speed control system is simulated and verified through simulation experiments.In order to improve the position synchronization performance of the dual-motor lifting platform system and realize the speed tracking synchronization and position synchronization,the existing synchronization control strategy is improved,and the dual-coupling loop synchronization control strategy is designed.This strategy adopts the PID control algorithm and has speed coupling.loop and position coupling loop,the simulation results show that the strategy can achieve speed tracking and position synchronization,and the synchronization performance is better than other control strategies.The controller hardware circuit and control program based on STM32F103C8T6 are designed.The hardware circuit includes a control circuit,a power supply circuit,a current sampling circuit and an H-bridge drive circuit,which can output multiple PWM signals,perform current sampling,and drive dual-motor variable speed.The soft start program is designed in the control program,which can realize the low-speed start of the motor;the PID speed regulation program with double coupling strategy is used to realize fast and highprecision positioning through speed planning.The actual test of the platform’s lifting in the paper proves that the start-up time is stable under different working conditions,the maximum lifting speed difference of the platform is2.5mm/s,and the maximum height difference is 0.375 mm.The controller circuit and algorithm designed in this paper can realize speed tracking and position synchronization,which can provide a reference for dual-motor multi-parameter synchronous control.