Rotor assembly and motor

The invention provides a rotor assembly and a motor, and the rotor assembly comprises a rotor and a rotating shaft, the outer circumference of the rotating shaft is provided with a limiting projection, one end of the rotor is provided with a locking baffle plate, the locking baffle plate is provided with an elastic arm, and when the rotor and the rotating shaft are assembled, the limiting projection can apply a force to the elastic arm along the axial direction of the locking baffle plate so as to form axial limiting of the rotor. According to the invention, the rotor can be axially locked and axially limited by directly matching the locking baffle plate with the limiting bulge without using a locking nut, a retaining washer, a welding ring or interference fit, the locking mode is reliable, the assembly and disassembly are convenient, the axial length is reduced, the locking baffle plate can be disassembled, the silicon steel sheet is prevented from loosening, and the service life of the rotor is prolonged. A