Hey, today I’m going to show you how to make a CPU fan motor for a drone, and I’ll make it on a controller. Let’s get started. The power I will make with the motor and controller will be like the motor of the entire drone. If you want to build drones, helicopters, and airplanes, follow my videos and posts.

A BLDC motor CPU fan is unique compared to traditional fan motors due to its advanced motor design and control. Here’s what makes it stand out:

CPU FAN HIGH SPEED Bldc Motor Controller MAKE at HOME

Features of a BLDC Motor CPU Fan

Brushless Design (No Physical Wear Points)
- Traditional brushed motors wear out faster due to friction from brushes.
- BLDC fans use electronic switching, increasing lifespan and reliability.
Precision Speed Control
- BLDC fans support PWM (Pulse Width Modulation), allowing precise control of fan speed based on CPU temperature.
- This results in optimized cooling and quiet operation when full speed isn’t needed.
Higher Efficiency
- BLDC motors convert electrical energy to mechanical energy more efficiently than brushed motors.
- This leads to lower power consumption, especially important in energy-conscious systems.
Reduced Noise
- Because there are no brushes causing friction or vibration, BLDC fans run more quietly — ideal for silent PC builds or laptops.
Compact and Durable
- They can be made more compact and last longer, making them suitable for tight PC enclosures or high-performance applications.
Smart Electronics
- Many BLDC CPU fans include embedded electronics that allow self-diagnostics, speed monitoring, and thermal management integration with the motherboard.

Bldc Cpu Fan Advantages and Disadvantages

Advantages of BLDC CPU Fan

Feature	Benefit
Brushless Design	No mechanical brushes = less wear and longer lifespan.
High Efficiency	Converts more power to airflow with less energy loss.
Low Noise	Smooth, quiet operation—ideal for silent PC builds.
Precise Speed Control (PWM)	Dynamic fan speed adjustment based on CPU temperature.
Less Heat Generation	Lower internal resistance and friction reduce motor heat.
Compact Electronics	Allows more compact and integrated fan designs.
Better Reliability	Lower failure rates due to reduced moving parts and advanced control.

Disadvantages of BLDC CPU Fan

Feature	Limitation
Higher Cost	More expensive due to complex electronics and motor design.
Electronic Complexity	Requires a compatible motherboard or fan controller for PWM.
Repair Difficulty	Integrated control circuitry makes it harder to service or modify.
Startup Delay	May take slightly longer to spin up due to safety/control protocols.
EMI Concerns	High-speed switching can produce electromagnetic interference (usually managed with shielding).

4 Pole Cpu Fan Winding

Now let’s complete the winding of the Bldc motor. You know that CPU fan has 4 poles. We have to complete the winding following the 4 poles.

Connect 4 wires from any pole together and then rotate the pole clockwise 30 times. Similarly, rotate the pole counterclockwise 30 times.

Now, we will wind the wire 30 times counterclockwise around the pole closest to it. Similarly, we will wind the opposite pole 30 times and finish by winding it.

How to Make Bldc Motor Controller

The controller for this bldc motor is a little different. I will make a different controller for this 2-phase motor.

First I will remove the smd mosfets from the computer motherboard. I am using smd mosfet here because this mosfet is active at low voltage and you can input maximum 20 volts on its gate pin and since this mosfet is active at low voltage we will use it.