A cooling fan is by dc voltage and electromagnetic induction, the electrical energy into mechanical turn to drive the cooling fan blades, the rotating become a dc fan cooling fan.
A cooling fan operation is changed by the condition of the heat, operating at a slower speed, cooling fan will produce less noise and consume less energy.
In most of the design requirements, hours after the cooling fan speed is running the air temperature is usually lower than the design of the maximum temperature value. Usually, low speed of cooling fan can work enough to finish it. But also should consider when choosing and installation:
First of all, the choice of cooling fans must provide enough (speed), exhaust air cooling equipment under high temperature condition inside the hot air; When the temperature is lower and the heat flow is less time to do instead of work.
Secondly, on the sensor installation position should be paid attention to when the choice, the sensor in place, can make the sensor directly clamped on the surface of need cooling. In a cooling fan operation, a temperature control cooling fans, if feel thermistor temperature is higher when operating at a rapid speed; And the temperature is lower, will be operating at low speed; In the middle of the high and low, the cooling fan speed will almost will not change by temperature.
Cooling fan of the temperature change is slow, the cooling fan speed change also slowly, not suddenly change cooling fan speed and noise. The length of the reaction time mainly depends on its sensor for thermal sensitivity. So the cooling fan speed control based on heat sink temperature sensor and automatic adjustment.
