Fast starting method using both inverter and delta-star starter for weaving machine drive systems

This paper proposes a fast accelerating method for the weaving machine drive system, which an open winding of the induction motor is used and connected in series to an inverter and a switching unit. Generally, the star(Y)-delta(Δ) switching method is used in the start-up mode in order to suppress the rush current in general applications. However, in weaving machine, the rush current is required in the start-up mode in order to increase starting torque. If the starting torque is not enough to the induction motor, deficiencies of fabric cloth which is called “start-up marks” will happen[1]. We proposes the Δ- Y switching method that achieve high rush current in order to increase starting torque for weaving machine drive system. From the experimental results, the start-up time of the proposed system is kept to the same as the direct power grid connection. In addition, rush current of the proposed system is decreased to 37.7% comparing to the direct power grid connection.