USAGE ; BE SUITABLE FOR STATORS OF SERIES INDUCING ELECTROMOTOR AND POLAR COVERED ELECTROMOTOR TO WIND INNER FEATURES; WINDING HEAD DO STRAIGHT AND SWINGING WORK VIA MECHANIC UNITED MOVE,TWO STATIONS WINDING WIRE SIMULTANEOUSLY,CHANGING SPEED VIA FREQUENT CONVERSION ,GRADUALLY ACCELERATING,DECELERATING SLOWLY TO STOP.