Abstract: Based on the position control servo system of higher precision but action response is slow, based on the speed control servo system response performance is good but easy to produce position overshoot positioning accuracy is poor. According to the single control structure is difficult to meet the requirements of high speed and high precision electronic shogging control on warp knitting machine, this paper proposes a kind of variable structure control strategy, that is, according to the produce speed and shogging number, making use of high frequency speed control response characteristics to start comb, and position control of high precision positioning properties to stop comb, combining and switching the speed control and position control real-time in one shogging movement, and, exchanging the quick adjustment of motor speed Far from slot needle for subsequent short position setting time, the dynamic real-time variable structure control can ensure a system for the rapid response and precise positioning synchronous. Through written validation test algorithm in DSP system, the dynamic variable structure control strategy can well improve the control performance of high-speed electronic shogging on warp knitting machine.

Key words: warp knitting machine, electrical shogging, position control, speed control, variable structure control