Motor rotor, motor and electric vehicle

The invention provides a motor rotor, a motor and an electric vehicle. The motor rotor comprises a rotor iron core, a V-shaped mounting groove and a U-shaped mounting groove are formed in each pole of the rotor iron core, magnetic steel is arranged in each of the V-shaped mounting grooves and the U-shaped mounting grooves, in a cross section perpendicular to the central axis of the rotor iron core, the included angle between two inner side edges of each V-shaped mounting groove is theta 1, and theta 2 is larger than theta 3. A first magnetic isolation groove is formed in one end of the V-shaped mounting groove, a second magnetic isolation groove is formed in one end of the U-shaped mounting groove, the included angle between two side edges, close to the d axis, of the first magnetic isolation groove is alpha 1, the included angle between two side edges, away from the d axis, of the first magnetic isolation groove is alpha 2, the included angle between two side edges, close to the d axis, of the second magneti