Rotor punching sheet, rotor, motor and electric tool

The utility model provides a rotor punching sheet, a rotor, a motor and an electric tool. The rotor punching sheet comprises a punching sheet body, a plurality of magnetic steel grooves and a plurality of magnetic poles. The outer arc corresponding to each magnetic steel groove is provided with at least one pair of first grooves, and each pair of first grooves takes the central line of the magnetic steel groove along the radial direction of the punching sheet body as a symmetry axis. And an acute angle is formed by connecting the centers of the two first grooves in each pair of first grooves and the circle center of the inner arc. Therefore, the cogging torque of the motor can be reduced, and the torque fluctuation of motor operation can be effectively reduced. The outer arc and the inner arc of the punching sheet body are eccentrically arranged, so that the cogging torque of the motor can be further reduced, the vibration noise of the motor is reduced, and the operation stability of the motor is improved. Me