Research And Design Of A DSP-based On Servo Control System For Industrial Sewing Machine

Ac servo drives employing permanent magnet synchronous motors are being used for various purposes in consumer products and industry applications. Although their technical advantages are generally acknowledged, researchers are becoming aware of their cost and are exploring the possibility of cost reduction. Especially for industrial sewing machines, a servo control system with low cost but high performance is needed.A current sensorless space voltage vector control algorithm is presented to the control of permanent magnet synchronous motors using simple low-resolution photoelectric encoder. This method directly control voltage vector and compensate the difference between voltage vector and current vector. The hardware and software are simplified without current sensors and cost is reduced. A cascaded control structure is presented for the sevo control system. PID controller is used to control the motor speed to improve interference immunity and obtain good tracking performance.TMS320F2407A digital signal processor (DSP) is selected as the CPU of the whole system and PM20CS060 intelligent power module (IPM) is selected for power drive. Hardware design is precise and flexible. Circuits have strong ability of noise resistance. Some isolation and shield methods are used to improve performance of electro magnetic compatibility (EMC). Results of system test and plant probation show that the whole control system has good performance with lower cost and has bright market prospect.