Approximate uniform acceleration-deceleration control method of servo motor for hosiery machines

The acceleration-deceleration control of a servo motor is one of key issues for control of hosiery machines.This work researches the servo control of hosiery machines by incorporating theoretic analysis into engineering practice.The article proposed three methods of uniform acceleration and deceleration: the first one takes a constant increment value to the pulse-width modulation(PWM) period;and the second one is the exact uniform acceleration-deceleration control based on the theoretical formula;and the last method is the engineering practice-based method whose acceleration and deceleration is approximately uniform.Their main properties such as accelerating-decelerating characteristics,feasibilities,real-time properties,computation burden,and so on are analyzed.Through the comparative analysis and test,drawn were the conclusion: the piecewise approximate uniform acceleration-deceleration control is the best method of the three.The practical operation also shows that this scheme has superior performance in acceleration and deceleration,and can guarantee the smooth operation of the whole system.