Development, Industrial Sewing Machine Based On Brushless Motor Servo System

With the development of needle trade continuously, the technology of industry sartorius has entered the machine united electricity stage at present. Under the situation of pursuing sew speed and quality; have developed the high-speed industry sartorius servo control system, with a view of reality.The dissertation has studied the problems of structure, control strategy, hardware and software design, about the high-speed industry sartorius servo control system. On the basis of detailed analyzing the principle of industry sartorius and servo control technology, control project of three closed loop which include velocity, current and position closed loop is designed. Brushless direct current motor is used for the servomotor, and particular introduced its structure principle and control method, detailed modeling is made by MATLAB. The subsection reformative PI control arithmetic and interactive learning control are most applicable of many possible choices after exhaustive discussion, investigation, simulation and comparison. The theory of system braking is mainly analyzed, braking and orientation problem is solved by the combined energy consumption breaking and plug braking.The hardware has MCU 80C196MC as the nucleus controller of system. The wave form generator in MCU generates a PWM wave whose pulse duty factor is adjustable,, the voltage of the motor is control by PWM wave . The phase commutation of Brushless DC motor is controlled by hardware. Power MOSFET and gate driver IC IR21365 composes the power drive circuit. In addition to some anti-interference technique is applied; a suit of single, trustworthy and high efficiency servo system hardware circuit is come in being.The module design method is adopted, the system soft ware is divided into many modules, such as system main program, velocity and current subprogram, keyboard and display subprogram, breaking and sew mode subprogram etc. The operation of the system is tested finally.