The first is by the rotor. The DC cooling fan composed of auxiliary components such as stator and fan blades should contain a large number of semiconductor components. At present, it has been stored in one or more ICs. Many manufacturers plan to manufacture various types of control motor ICs for fan circuit planning and use. Although the various types of IC operating circuits are different, the main goal is to provide useful functions of the coil to provide more useful characteristics for operating and repairing the motor.
What is DC fan protection detection?
I .. Insulation compressive strength.
Through 5mA leakage current and AC500V continuous operation for 60 seconds, there is no abnormality in the fan frame and transmission line, which proves that the insulation is good.
2. insulation characteristic impedance.
When DC 500V is required, the frame of the positive resistor of the transmission line shall not be less than 10MΩ.
3. rotation lock protection device.
1. A plurality of fan blades are connected to restrict their rotation. If the fan and electronic components are not easily damaged and the restricted rotating parts are loosened, the fan can automatically restart the rotation.
2. High current cooling fan or no automatic start basic function, can not be locked for a long time, otherwise the heat sink will be damaged by overtemperature.
3. The electric fan or with automatic start function, lock the fan blades when the power is on, release the locked fan blades after 72 hours, and the fan will automatically restart immediately, proving that the fan is not abnormal.
4. polarization maintenance
Under all normal standard voltages, as long as the reverse power supply is plugged into the heat sink for 15 minutes, the power supply is turned off and then connected according to the normal two poles, all functions are normal.
5. just fall off.
A single piece of woodworking board with a thickness of 30mm is dropped from a height of 600mm. All one side and one corner of the six surface layers of the heat dissipation fan can withstand the drop test, and it is determined that there is no damage.