The part number **09450-R** generally refers to a specific series of high-performance **axial cooling fans**, most commonly manufactured by **NMB Technologies (MinebeaMitsumi)**. These are widely used in server racks, power supplies, and industrial machinery. --- ### 1. Technical Specifications The "09450" designation often correlates with the physical dimensions and motor frame size. Below is a typical profile for parts within this series: | Feature | Specification | | :--- | :--- | | **Frame Size** | 92mm x 92mm x 25mm (Standard) | | **Voltage Options** | 12V DC, 24V DC, or 48V DC | | **Bearing Type** | Dual Ball Bearing (indicated by "B" in extended suffixes) | | **Material** | Plastic (UL94V-0) PBT Housing & Impeller | | **Termination** | 2-wire (Lead wires) or 3-wire (Tachometer/PWM) | | **Airflow** | High static pressure design | --- ### 2. Part Number Breakdown (NMB Logic) While "09450-R" is the base series, the full part number often includes suffixes that define the electrical characteristics. * **094:** Represents the 92mm frame size. * **50:** Represents the 25mm thickness. * **R:** Usually indicates the **Revision** or a specific **Internal Design** (Rib type/Flange type). * **Voltage Code:** Often followed by a letter (e.g., `12` for 12V). --- ### 3. Key Electronic Features These fans are not just motors; they contain integrated circuitry to manage operation: * **Brushless DC (BLDC) Motor:** Uses electronic commutation instead of brushes, increasing lifespan and reducing EMI. * **Auto-Restart Protection:** If the fan blades are obstructed, the internal IC shuts down the drive current to prevent the coils from burning out, then attempts to restart once the obstruction is removed. * **Polarity Protection:** Prevents damage if the positive and negative wires are accidentally reversed during installation. * **Locked Rotor Alarm (Optional):** Some "R" series models include a third wire (yellow or white) that sends a signal to the motherboard if the fan stops spinning. --- ### 4. Common Applications * **IT Infrastructure:** Cooling for 2U/3U server chassis. * **Power Electronics:** Heat dissipation for high-wattage switching power supplies. * **Medical Equipment:** Reliable cooling for diagnostic machines.