Motor rotor, motor and electric vehicle

The utility model provides a motor rotor, a motor and an electric vehicle. The motor rotor comprises a rotor iron core, and in a cross section perpendicular to a central axis of the rotor iron core and under one pole, a rotor excircle of the rotor iron core comprises a first arc section, a second arc section and a third arc section which are sequentially arranged from two sides to the middle along the circumferential direction, the first arc section, the second arc section and the third arc section which are located on the two sides of the center line of the magnetic pole are symmetrical about the center line of the magnetic pole, the first arc section and the rotor core are coaxially arranged, the second arc section is concave inwards, the circle center of the second arc section is located on the outer side of the outer circle of the rotor core, and the third arc section is eccentrically arranged relative to the first arc section. The diameter of the third arc section is smaller than that of the first arc se