Direct current voltage and electromagnetic induction are used to power DC fans, transforming electrical energy into motion for the blades to follow. Therefore, the fan casing and blades are crucial pieces, and most people are aware of their significance. So what is their relationship's function?
Starting with blade curvature: Within a particular range, the greater the blade curvature, the greater the kinetic energy of the gas at the same speed, or, more specifically, the bigger the air volume and pressure; at the same time, the greater the resistance on the blades, the more the torque needed for the motor.
Secondly, motor diameter: Due to the presence of the motor and bearings, the central part where the DC fan spindle is located inevitably has no blind spot for airflow, and the diameter of the spindle determines the size of this blind spot. The size of the spindle diameter mainly depends on the power of the fan motor - high-power motors require larger stator winding coils, which inevitably occupy more space. In the case of inability to expand vertically (increase height), they have to expand horizontally (increase area).
Thirdly, blade curvature: In addition to having a certain curvature on the cross-section, the fan blades do not extend straight along the radial direction in the overhead plane, but slightly bend in the direction of rotation, forming a certain curvature. If the blades extend straight along the radial direction, the airflow driven by the rotation of the cooling fan will be scattered on one side of the air outlet, with a short supply distance and no concentration of "force"; If the current product version is slightly curved, it can ensure that the blown airflow is concentrated in the cylindrical space directly in front of the air outlet, increasing the supply distance and air pressure.
Fourthly, blade spacing: If the distance between blades is too small, it will cause airflow disturbance, increase friction on the blade surface, and reduce fan efficiency; Excessive distance between blades can lead to increased pressure loss and insufficient wind pressure.
