Technical Blog -- Cooling Guides & Application Notes | Herays
Technical Blog

Technical Resources & Industry Insights

Explore technical guides, application notes, product selection tutorials, and industry news for industrial cooling solutions.

A dust-resistant DC axial fan mounted in the electronics enclosure of a CNC machine
DC Axial Fan

DC Axial Fans for Laser Engravers and CNC Machines: Cooling the Electronics, Not the Workpiece

A laser engraver that runs perfectly for an hour and then starts producing inconsistent burns isn't a laser problem most of the time. It's a driver board quietly overheating inside a sealed enclosure. A DC axial fan matters in laser engravers and CNC machines because the driver electronics, stepper motors, and power supplies generate real […]

Liang · · 12 min read
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A black cylindrical snap-on ferrite bead clamped around the red and black power wires of a DC axial fan, clip-on toroid core for EMI suppression, macro product photography
DC Axial Fan

DC Fan EMC & EMI: Managing Electrical Interference

A customer's board once failed EMC certification three times before anyone thought to check the cooling fan. The fan itself worked perfectly. It was also radiating enough switching noise to interfere with a sensor circuit six inches away, and nobody had budgeted time to debug it that late in the project. EMI from a DC […]

Liang · · 9 min read
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A metal-frame DC axial fan mounted inside a high-temperature industrial control cabinet
DC Axial Fan

Metal Frame DC Axial Fans: When Plastic Isn’t Enough

An engineer's fan kept failing inside a foundry control cabinet last year -- not from dust, not from moisture, but from heat warping the plastic frame just enough to throw the blades out of clearance. Swapping to a metal-frame fan solved it in one shipment. It's a small, unglamorous fix, and most engineers never think […]

Liang · · 10 min read
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Photo of various DC axial fans arranged on an anti-static mat
DC Axial Fan

Low Voltage DC Fans: 3.3V, 5V, and Below

If you've ever tried to cool a Raspberry Pi or a compact piece of low-voltage electronics, you've probably hit this exact wall: finding a fan that actually runs -- and reliably starts -- on 5V or 3.3V isn't as simple as it looks on a datasheet. Key Takeaways When people say "low voltage" in this […]

Liang · · 10 min read
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