A method of manufacturing a can assembly of a coreless AC linear motor is provided. The method includes the steps of providing a workpiece and gouging out material from the workpiece to form a deep groove in the workpiece. The workpiece having the deep groove forms a can. The method also includes providing a plurality of coreless coils and arranging the plurality of coreless coils in a straight line. The method also includes forming the plurality of coreless coils into a flat plate-shaped block using resin or adhesive. The flat plate-shaped block forms a coil assembly. The method also includes inserting the coil assembly into the deep groove of the can. The can assembly comprises the can and the coil assembly.