A rotor for a motor, comprising a magnetic yoke , wherein the magnetic yoke is in a cylindrical-like shape, and the magnetic yoke is configured to fix a magnet on its circumference surface; and a rotor support , comprising a shaft connection unit and a supporting ring , wherein the shaft connection unit is coaxially connected to a rotation shaft of the motor, the supporting ring is arranged on an outer periphery of the shaft connection unit , and the magnetic yoke is arranged to be coaxially connected to the supporting ring ; wherein the supporting ring has a structure divided into a plurality of segments in the circumference direction of itself, the supporting ring comprises a plurality of supporting plates , the plurality of the supporting plates are successively spliced into an annular sheet-like body in the circumference direction, each supporting plate is provided with a first connection portion (C1), the shaft connection unit is provided at its outer periphery with a second connection portion (C2), and the plurality of supporting plates are connected to the second connection portion (C2) of the shaft connection unit through the first connection portions (C1); at least one slot (S1) is formed on a surface of one of the first connection portion (C1) and the second connection portion (C2) facing to the other of the first connection portion (C1) and the second connection portion (C2), the other one of the first connecting part (C1) and the second connecting part (C2) is a convex connection portion matched with the slot (S1) in shape, and a pair of wedges (W1) opposite to each other are inserted and arranged in each slot (S1). a magnetic yoke , wherein the magnetic yoke is in a cylindrical-like shape, and the magnetic yoke is configured to fix a magnet on its circumference surface; and a rotor support , comprising a shaft connection unit and a supporting ring , wherein the shaft connection unit is coaxially connected to a rotation shaft of the motor, the supporting ring is arranged on an outer periphery of the shaft connection unit , and the magnetic yoke is arranged to be coaxially connected to the supporting ring ; wherein the supporting ring has a structure divided into a plurality of segments in the circumference direction of itself, the supporting ring comprises a plurality of supporting plates , the plurality of the supporting plates are successively spliced into an annular sheet-like body in the circumference direction, each supporting plate is provided with a first connection portion (C1), the shaft connection unit is provided at its outer periphery with a second connection portion (C2), and the plurality of supporting plates are connected to the second connection portion (C2) of the shaft connection unit through the first connection portions (C1); at least one slot (S1) is formed on a surface of one of the first connection portion (C1) and the second connection portion (C2) facing to the other of the first connection portion (C1) and the second connection portion (C2), the other one of the first connecting part (C1) and the second connecting part (C2) is a convex connection portion matched with the slot (S1) in shape, and a pair of wedges (W1) opposite to each other are inserted and arranged in each slot (S1). <EOS>