Motor rotor assembly unit using mixed permanent magnet material, and motor rotor

The invention provides a motor rotor assembly unit using a mixed permanent magnet material, and a motor rotor, wherein a double-layer U-shaped magnetic steel groove is arranged in the rotor, and comprises a first U-shaped magnetic steel groove and a second U-shaped magnetic steel groove, the first U-shaped magnetic steel groove is close to the outer circle curved surface of the rotor, and the second U-shaped magnetic steel groove and the first U-shaped magnetic steel groove form a wrapping structure. According to the invention, specific magnetic steel groove size and position arrangement, rotor outer circle shape and effective mixed permanent magnet material use are realized, so that the problem that a common rare earth permanent magnet motor is low in high-speed NEDC working condition efficiency is successfully solved, on the basis that the mechanical strength of a rotor core is guaranteed, the motor can normally output needed torque and power, the torque pulsation of the motor is lowunder the working condit