Center positioner for single-groove punching of motor punching sheet

The utility model relates to a center positioner for single-groove punching of a motor punching sheet, belongs to the technical field of motor punching sheet processing, and solves the technical problems of low precision, low efficiency and the like of a traditional positioner. According to the solution, the center positioner for single-groove punching of the motor punching sheet comprises a positioning disc and a plurality of contact blocks; the positioning disc comprises a cylindrical chassis and an annular bulge coaxially arranged on the top surface of the cylindrical chassis, a connecting sleeve is coaxially arranged at the center of the positioning disc, a plurality of groups of contact block placing grooves are uniformly distributed in the coaxial circumference of the positioning disc, and the plurality of groups of contact blocks are fixedly arranged in the contact block placing grooves respectively; and a positioning key matched with a key slot on the motor punching sheet is arranged at the outer edge