Patent ID: 8344578

Claim:
A motor rotor comprising: an outer casing being hollow and having two open ends; multiple silicon-steel sheets stacked and mounted in the outer casing between the open ends of the outer casing and each silicon-steel sheet having a center; and multiple through holes formed through the silicon-steel sheet at intervals around the center of the silicon-steel sheet; multiple copper sheets mounted in the through holes of the silicon-steel sheets, extending out of the silicon-steel sheets and the open ends of the outer casing and each copper sheet having two free ends extending out of the silicon-steel sheets and the open ends of the outer casing; and two side faces and each side face of the copper sheet having an outer end; and a flat inner end being flat and having a distance to the center of the silicon-steel sheet being smaller than that between the center of the silicon-steel sheet and the outer end to enable a distance between the outer ends of two adjacent copper sheets to be smaller than a distance between the flat inner ends of the adjacent copper sheets; and multiple copper bars inserted into the copper sheets from the flat inner ends to the outer ends of the side faces of the copper sheets without extending out of the outer ends of the side faces of the copper sheets.