The **M3A25FBX-R** is a specific part number belonging to a series of high-performance thermal management and electronic cooling components, typically manufactured by companies like **Nidec Copal** or similar industrial fan producers. Specifically, this model is a **Brushless DC (BLDC) Axial Fan**. Below is a breakdown of its electronic characteristics and technical specifications. --- ### 1. Technical Specifications The electrical parameters define how the fan integrates into a power circuit. | Feature | Specification | | :--- | :--- | | **Motor Type** | Brushless DC (BLDC) | | **Rated Voltage** | 12V DC (Typical for M3A series) | | **Bearing Type** | Dual Ball Bearing (for longevity) | | **Frame Material** | Aluminum or PBT Plastic (Model dependent) | | **Termination** | Lead Wires (usually UL1007 AWG24/26) | | **Speed Control** | Fixed or PWM (Pulse Width Modulation) | --- ### 2. Key Electronic Components Internally, the M3A25FBX-R consists of several critical electronic sub-assemblies: * **Permanent Magnet Rotor:** Uses high-grade magnets to ensure consistent torque and rotation. * **Stator Windings:** Copper coils that create the electromagnetic field. * **Commutation IC:** An integrated circuit that replaces mechanical brushes. It detects the rotor position (often via a Hall Effect sensor) and switches the current to the coils. * **Protection Circuitry:** * **Locked Rotor Protection:** Automatically cuts or reduces power if the blades are obstructed to prevent the motor from burning out. * **Reverse Polarity Protection:** Prevents damage if the positive and negative leads are connected incorrectly. --- ### 3. Pinout and Wiring Most variants of this series follow the standard industrial color coding for DC fans: | Wire Color | Function | Description | | :--- | :--- | :--- | | **Red** | VCC (+) | Positive power supply (12V) | | **Black** | GND (-) | Ground/Negative | | **Yellow** | Tachometer | Output signal (Frequency Generator) to monitor RPM | | **Blue** | PWM | Input signal for variable speed control (if equipped) | --- ### 4. Typical Applications Due to the "FBX" designation (often indicating high airflow and reliability), these parts are found in: 1. **Server Racks:** High-density cooling for data centers. 2. **Industrial Power Supplies:** Dissipating heat from high-wattage transformers. 3. **Medical Equipment:** Reliable cooling for imaging and diagnostic tools.