The RDC Clamped Circuit Research on the High-Speed Flat Sewing Machine

The high-speed Flat Sewing Machine is the most widely used macaronis full-automation Sewing Machine. The sewing tasks are intermittent which leads to a frequent actuation and long operating time of the magnetic valve. It puts higher requirements on the magnetic valve. Based on this problem, this paper adopt the RDC Clamped Circuit to reduce the turn-off loss and suppress the drain voltage of MOSFET rising. First analyze the turn-off loss of RDC circuit and the PWM characteristics, and then deduce the relationship between the parameters of RDC circuit and the controller by theoretical calculation. Finally, the experiments prove the validity and effectiveness of the method, and also offer a theoretical foundation for the practical engineering application.