Balance disc, rotor assembly and power motor

The utility model relates to a balance disc, a rotor assembly and a power motor, the balance disc is used for being installed on a rotating shaft, the balance disc comprises a disc body, the disc body is provided with an air guide portion, and the air guide portion is arranged in a penetrating mode along the thickness direction of the disc body. And air in the external environment can pass through the air guide part to be in contact with the rotor iron core and the magnetic steel which are mounted on the rotating shaft. When the rotor assembly rotates at a high speed, air located in the surrounding environment of the balance disc can be sucked into the air guide part, penetrates through the air guide part and then makes contact with the rotor iron core and the magnetic steel, heat exchange is carried out in the contact process, heat of the rotor iron core and the magnetic steel is taken away, and the effect of cooling the rotor iron core and the magnetic steel is achieved. Therefore, even if the rotor assembl