A clamping assembly, for fixing a stator to a rotor of a permanent magnet motor, wherein the clamping assembly comprises: first clamping members, connecting the stator with a rotor bracket of the rotor on an axial side of the permanent magnet motor, the first clamping members being disposed inside an air gap formed between the stator and the rotor in a radial direction; and second clamping members, connecting the stator with the rotor bracket of the rotor on the other axial side of the permanent magnet motor, wherein at least two first clamping members and at least two second clamping members are distributed in a circumferential direction of the stator and the rotor respectively, wherein the first clamping members each comprises: a body portion, formed as a column structure and comprising a first end portion and a second end portion disposed opposite to each other in the axial direction; and a connecting portion, disposed at the second end portion, the first clamping members each being connected to the stator by the connecting portion; wherein the first clamping members each further comprises: a flange portion, disposed on an outer peripheral surface of the body portion corresponding to the first end portion, the first clamping members each being connected to the rotor bracket by the flange portion; wherein a maximum length of each of the first clamping members in the axial direction is equal to a distance between an end surface of the flange portion and an end surface of the connecting portion. first clamping members, connecting the stator with a rotor bracket of the rotor on an axial side of the permanent magnet motor, the first clamping members being disposed inside an air gap formed between the stator and the rotor in a radial direction; and second clamping members, connecting the stator with the rotor bracket of the rotor on the other axial side of the permanent magnet motor, wherein at least two first clamping members and at least two second clamping members are distributed in a circumferential direction of the stator and the rotor respectively, wherein the first clamping members each comprises: a body portion, formed as a column structure and comprising a first end portion and a second end portion disposed opposite to each other in the axial direction; and a connecting portion, disposed at the second end portion, the first clamping members each being connected to the stator by the connecting portion; wherein the first clamping members each further comprises: a flange portion, disposed on an outer peripheral surface of the body portion corresponding to the first end portion, the first clamping members each being connected to the rotor bracket by the flange portion; wherein a maximum length of each of the first clamping members in the axial direction is equal to a distance between an end surface of the flange portion and an end surface of the connecting portion. a body portion, formed as a column structure and comprising a first end portion and a second end portion disposed opposite to each other in the axial direction; and a connecting portion, disposed at the second end portion, the first clamping members each being connected to the stator by the connecting portion; wherein the first clamping members each further comprises: a flange portion, disposed on an outer peripheral surface of the body portion corresponding to the first end portion, the first clamping members each being connected to the rotor bracket by the flange portion; wherein a maximum length of each of the first clamping members in the axial direction is equal to a distance between an end surface of the flange portion and an end surface of the connecting portion. a flange portion, disposed on an outer peripheral surface of the body portion corresponding to the first end portion, the first clamping members each being connected to the rotor bracket by the flange portion; wherein a maximum length of each of the first clamping members in the axial direction is equal to a distance between an end surface of the flange portion and an end surface of the connecting portion.