Technology used in Fourdot Coolings Fans

Brushless DC (BLDC) motor technology is the gold standard for PC fans because it solves the biggest problem with traditional motors: physical contact. Instead of using physical brushes to switch the current, BLDC motors use electronic commutation.

The Permanent Magnet (Rotor): In a PC fan, the magnet is actually attached to the fan blades themselves.
The Copper Coils (Stator): These stay stationary in the center of the fan.
The Hall Effect Sensor: This is the "brain." It detects the position of the magnet and tells the controller which coils to energize.

Close-up of an electric motor's copper coils and fan blades.

The fan operates using electromagnetic principles to move air while minimizing physical friction.

The image illustrates the internal components of a Brushless DC (BLDC) Cooling Fan, specifically highlighting a Dual Ball Bearing system. This technology is the gold standard for high-performance cooling in computers, servers, and industrial equipment.

Why Ball Bearing Technology Matters

In the world of cooling, there are two main types:

1. Sleeve Bearings (cheaper, oil-based)

2. Dual Ball Bearings

The technology shown is designed for reliability and longevity. While a sleeve bearing fan might fail after a year of heavy use in a hot environment, a dual ball bearing fan is engineered to run continuously for several years without the lubricant drying out or the shaft seizing.

Technology Benifits

Lifespan : 60000 Hours

Temperature range : -10 to 70 Degree

Humidity : 95% RH

Noise : 20 to 60 dB (Depends on the running speed)

Mounting : Any (Vertical is best)

Sizes (mm) : 25, 30, 40, 50, 60, 70, 80, 92, 120mm

Voltage Range : 5 to 14 Volts DC

Detailed Component Breakdown

1. Fan Leaf (Rotor)

Material: Constructed from a blend of PBT (Polybutylene terephthalate) and glass fiber.

Purpose: This composite material ensures the blades are rigid and resistant to deformation even at high speeds, which maintains consistent air pressure and "wind force".

2. Spring + Gasket

Function: These small mechanical components are placed on the shaft for shock absorption and pressure reduction.

Benefit: They provide "better fan protection" by dampening vibrations that could otherwise damage the motor or bearings over time.

3. Coil + Steel Sheet (Stator)

Construction: The motor core is made of pure copper wire wound around a steel sheet stack.

Purpose: This assembly generates the electromagnetic field necessary to spin the fan. Using pure copper ensures high electrical conductivity and "stability of the fan" during operation.

4. Double Ball Bearing

Technology: Unlike standard fans that use friction-heavy sleeves, this model features a built-in double ball bearing system.

Advantages: This design is specifically noted for providing a long lifespan and low noise levels, as the rolling elements significantly reduce internal friction.

5. Outer Frame

Material: The housing is made of blend of PBT (Polybutylene terephthalate) and glass fiber. .

Purpose: Beyond structural integrity, the metal frame acts as a secondary heat sink, offering a better heat dissipation effect compared to standard plastic frames.