The Study Of Control Systerm In Automatic And Direct-drive Industry Sewing Machine Based On DSP

Mechatronics is inevitable trend of the development of industry sewing machine, which is direct-drived by Blushless DC Motor and controlled by DSP. This system integrated optical, electrical and magnetic as one of the typical mechanical and electrical integration products. DSP is the heart of the control system; the experimental prototype is based on specific analysis of the sewing machine performance requirements which is fast start/hold, wide range of speed and precise positioning. It has been revised five times for industrial production. It basically meets the demand of industrial production.The main work of this paper is as follows.(1) Based on the introduction of structure and mathematical model of BLDCM, and Industry Sewing Machine is a hysteretic, time-variant and nonlinear system. Sub-PID is used because that traditional PID can not deal with the complex situations.(2) The hardware and software for Industrial Sewing Machine based on DSP is designed, including Power circuit, IPM Driving Circuit, Control Circuit of DSP, Keyboard Circuit, Pedal circuit. Because the Direct-Drive Industrial Sewing Machine has complex logic and functions, the software makes the program as modules and the main program will be simple and easily updated.(3) The experiments proved that the speed control system and stop-position can meet the performance requirements of Industry Sewing Machine.