The sewing AC permanent magnetic synchronous servo controller is used for driven control of industrial sewing equipments, with merits of Small inertia, featured by high, medium speed. Precisely control on torque can adapt it to thin, moderate thick sewing machine,the protection on overcurrent of soft and hardware.and that on the shortage of voltage makes the controller more reliable it can realize non-polar control of sewing speed. thus the sewing machine can fulfill all kinds of auto-sewing tasks. It can save time, energy, high-efficiency and energy saving control effect