... ventilation, heat, cooling function. The product design through CNC brushless motor speed control system of direct drag-driven sewing machine, the ... the highest speed adjustable motor to support the 3800RPM, 2800RPM, 1800RPM. 8, the use of the motor can not have a ... you the unconditional installation of energy-saving XC-422 brushless motor!The provision of supporting facilities, the results of product ...