The part name and material / characteristic corresponding to the product No.? No. name, material / characteristic No. name, material 1, high temperature nylon is used for the wind blade parts, which has small deformation and stable operation of the motor under high temperature. The P / M insert is used for higher reliability. 3, the front and rear end covers of the motor assembly are formed by progressive die stamping, with high coaxiality and stable operation of the motor. Low noise and long-life electric brush is used. The motor can work for a long time under the condition of low noise; the silent bearing is used to reduce the noise of motor operation; the armature parts are made of full-automatic assembly line, with higher consistency and stability; 2 the air retainer is made of high temperature resistant, low warpage and shock absorbing materials, which changes under high temperature.