A rotor, comprising a rotor iron core and a rotor shaft, wherein: the rotor iron core is cylindrical in shape and has a first end and a second end along an axial direction, fastening plates are separately fastened to the first end and the second end of the rotor iron core, a through hole (5, 31) and a first runner are disposed in the fastening plates; the through hole (5, 31) is arranged along the axial direction of the rotor iron core, the first runner is a damping runner, an inlet of the first runner communicates with the through hole (5, 31), and an outlet of the first runner is disposed on a surface of a circumferential outer side of the fastening plates; and the rotor shaft is securely fitted in the rotor iron core, and at least one end of the rotor shaft extends to the outside of the rotor iron core from the through hole (5, 31) of the fastening plate; a second runner and a third runner are disposed in the rotor shaft, wherein the second runner is disposed along an axial direction, wherein the third runner is disposed along a radial direction at least at one of positions corresponding to the through hole (5, 31); an inlet of the second runner is disposed at one end of the rotor shaft, an outlet of the second runner communicates with an inlet of the third runner, and an outlet of the third runner communicates with the inlet of the first runner; wherein a fourth runner is disposed on an inner wall of the rotor iron core along the axial direction of the rotor iron core and extends from the first end to the second end, an inlet of the fourth runner communicates with the first runner in the fastening plate fastened to the first end, and an outlet of the fourth runner communicates with the first runner in the fastening plate fastened to the second end; or a fourth runner is disposed between an inner wall and an outer wall of the rotor iron core along the axial direction of the rotor iron core and extends from the first end to the second end, an inlet of the fourth runner communicates with the first runner in the fastening plate fastened to the first end, and an outlet of the fourth runner communicates with the first runner in the fastening plate fastened to the second end. the rotor iron core is cylindrical in shape and has a first end and a second end along an axial direction, fastening plates are separately fastened to the first end and the second end of the rotor iron core, a through hole (5, 31) and a first runner are disposed in the fastening plates; the through hole (5, 31) is arranged along the axial direction of the rotor iron core, the first runner is a damping runner, an inlet of the first runner communicates with the through hole (5, 31), and an outlet of the first runner is disposed on a surface of a circumferential outer side of the fastening plates; and the rotor shaft is securely fitted in the rotor iron core, and at least one end of the rotor shaft extends to the outside of the rotor iron core from the through hole (5, 31) of the fastening plate; a second runner and a third runner are disposed in the rotor shaft, wherein the second runner is disposed along an axial direction, wherein the third runner is disposed along a radial direction at least at one of positions corresponding to the through hole (5, 31); an inlet of the second runner is disposed at one end of the rotor shaft, an outlet of the second runner communicates with an inlet of the third runner, and an outlet of the third runner communicates with the inlet of the first runner; wherein a fourth runner is disposed on an inner wall of the rotor iron core along the axial direction of the rotor iron core and extends from the first end to the second end, an inlet of the fourth runner communicates with the first runner in the fastening plate fastened to the first end, and an outlet of the fourth runner communicates with the first runner in the fastening plate fastened to the second end; or a fourth runner is disposed between an inner wall and an outer wall of the rotor iron core along the axial direction of the rotor iron core and extends from the first end to the second end, an inlet of the fourth runner communicates with the first runner in the fastening plate fastened to the first end, and an outlet of the fourth runner communicates with the first runner in the fastening plate fastened to the second end.