Design of a High-Speed Rapier Loom Control System Based on a Mixed Current Attenuation Algorithm

At present, the weft selection and selvedge control systems available on the loom do not support precise control of the weft selection and selvedge devices, which will reduce the dynamic performance and production efficiency of the loom. The low-frequency oscillation and back Electromotive force (EMF) of the stepping motor are the main factors that affect the stability of the control system. This paper proposes an optimized mixed current attenuation algorithm that is dedicated to improving the performance of the system. The contribution and innovation of this paper is that the mixed current attenuation algorithm is proposed to improve the low frequency oscillation and back-EMF of the stepping motor and applied to the actual loom production. In this paper, the current subdivision drive is used to improve the low-frequency oscillation of the stepper motor of the weft selection and twisting device, and the back-EMF is reduced by the mixed current attenuation algorithm. First, to verify the effectiveness of the mixed current attenuation algorithm, this paper conducts a motor winding current waveform test. Then, by comparing the acceleration and deceleration control effects in the current self-decay mode, it is verified that the mixed current attenuation algorithm can effectively reduce the low-frequency oscillation and back-EMF of the stepper motor, and improve the dynamic performance and production efficiency of the stepper motor. Finally, the algorithm was debugged and verified on the high-speed rapier loom test platform. By recording and comparing the number of stops of the loom in a certain period of time, it can be concluded that the number of stops caused by the process error of weft selection and selvedge is greatly reduced. Experiments show that the weft selection and selvedge control system using the mixed current attenuation algorithm can achieve precise control of the weft selection and selvedge device, which can effectively improve the productivity and dynamic performance of the loom while reducing the low-frequency oscillation and back-EMF of the stepping motor. Experiments show that the mixed current attenuation algorithm meets the technological requirements of weft selection and selvedge and has a good application prospect.