Cooling fan speed refers to the number of times the fan blade rotates per minute, the unit is RPM. The rotational speed measuring instrument refers to the measurement of the rotational speed of an object, and the digital display measuring instrument is generally used.
Operation principle of cooling fan. When the cooling fan is working, the first thing is to convert electrical energy into mechanical energy. The principle is primarily: when power is supplied to the heat dissipation fan, current passes through the fan coil. According to Ampere's right-hand rule, we know that a magnetic field will occur around the coil, and a rubber magnet filled with magnetism is attached to the inside of the heat dissipation fan blade. The magnetic field generated by the conductor generates a suction and repulsion force with the fixed magnetic field. When the suction and repulsion force is greater than the static friction force of the electric fan (the friction force of the electric fan bearing, the wind resistance of the fan blade rolling), the fan blade naturally rolls.DC fanThe power supply voltage is fixed, and the Hall induction component must be used as a synchronous detection device to control a set of circuits so that the circuit makes the two sets of coils around the axis work in turn to generate different magnetic fields.
Through the operation principle of the electric fan, we know that the primary decision conditions for the rotation speed of the electric fan are the structure and parts of the electric fan, the friction force of the bearing and the wind resistance of the inclination angle of the fan blade, etc. Of course, there are also external factors. Let's analyze below: the heat dissipation electric fan realizes heat dissipation through air cooling, and the factor affecting the heat dissipation of air cooling is mainly the environmental structure of the heat dissipation system. When the system is relatively sealed environment, when selecting a heat dissipation electric fan, the wind pressure of the electric fan should be considered. If the wind pressure of the electric fan is not enough, the rotation speed of the electric fan will be significantly affected, and the air volume will drop significantly, thus the heat dissipation effect cannot be achieved. Therefore, the external wind pressure is a factor affecting the rotation speed of the electric fan (pressurized heat dissipation electric fan can be overcome); Another significant factor is the external environment, such as sandstorm, greasy, high and high and low temperature, the impact of the harsh environment on its speed is also very significant.