"Cooling Fan Manufacturer" is the core component of the motor movement, movement, there are many materials, and materials available in the market with the most are: the movement of copper, copper clad aluminum wire movement and movement. Copper Movement highest permeability, and attenuation coefficient, the longest life expectancy, cost expensive; secondly copper clad aluminum, aluminum motor again. Identification of "Cooling Fan Manufacturer" movement material is the best way to gauge metal, but in general it is difficult to achieve, the conventional method of soil is the most direct: a look! Look at the movement of colors, disassemble the motor to see the movement of colors, by the color of direct discrimination whether the movement is aluminum; two rub! Rub the surface movement, copper clad aluminum "Cooling Fan Manufacturer" movement was repeated several times to wipe down the surface of the copper will drop, after falling in the surface layers of silver, compared with copper clad aluminum motor movement; three weigh! Looking for the same type of motor, the motor housing removed, the motor is greater than the weight of copper and copper clad aluminum motor motor.