Air-cooled spindle motor is a special type of motor mainly used in CNC machine tools. It dissipates heat through internal air circulation and does not require the use of a water cooling system. This kind of motor is mainly used for high-precision, high-speed, and high-stability machine tool processing requirements, especially when the cooling performance is relatively poor. Air-cooled spindle motors are mainly used in equipment with smaller power, such as household and small machine tools. Now we will provide the knowledge of the working principle, hoping to help someone who needs it.