How do you perform protective testing on DC fans?
Category:
Industry Trends
Release time:
2021-12-06
First, the control circuit of a DC cooling fan—composed of auxiliary components such as the rotor, stator, and blades—should incorporate a large number of semiconductor components. Currently, these components have been integrated into one or more ICs. Many manufacturers specialize in designing various types of motor-control ICs for use in fan circuits. Although the specific control circuits implemented by different ICs vary, their primary goal is to provide the coil with effective functionality, thereby enhancing the motor’s controllability and facilitating easier maintenance.
What is DC fan protection detection?
1. Insulation dielectric strength.
With a leakage current of 5mA and an AC voltage of 500V applied for a continuous 60-second test, neither the fan frame nor the power cable showed any abnormalities, confirming excellent insulation performance.
2. Insulation characteristic impedance.
When a DC voltage of 500V is required, the resistance of the positive terminal resistor in the transmission line shall be no less than 10 MΩ.
3. Rotating locking protection device.
1. Multiple fan blades are connected in such a way that they are fixed and cannot rotate freely. If the fan and electronic components are not easily damaged, loosening the components that restrict rotation will allow the fan to automatically restart and resume spinning.
2. The high-current cooling fan lacks an automatic start-up function and should not be locked in place for extended periods; otherwise, the heat sink could be damaged due to overheating.
3. The fan is equipped with an automatic start-up function: When power is applied, the fan blades are locked; after 72 hours, the lock is released, and the fan immediately restarts automatically, confirming that the fan is functioning normally.
4. Polarization Maintenance
Under normal standard voltage conditions, simply reverse the power connection and plug it into the heatsink for 15 minutes. After turning off the power, reconnect the terminals in the normal polarity, and all functions will operate normally.
5. Just falls off casually.
A single piece dropped from a height of 600 mm onto a 30-mm-thick plywood board; all six surface layers of the heat-dissipating fan—including one side and one corner—passed the drop test without sustaining any damage.
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