The **W2AC-AC4B-R** is a specific model of a **W2 series AC Axial Fan**, typically manufactured by **Sanyo Denki** (San Ace brand). These fans are designed for high-performance cooling in industrial equipment and server racks. --- ## Technical Specifications Below is a breakdown of the key electronic and physical characteristics of this part: | Characteristic | Specification | | :--- | :--- | | **Input Voltage** | 100V - 115V AC (depending on specific region config) | | **Frequency** | 50 / 60 Hz | | **Current / Power** | ~0.14A to 0.20A (approx. 15-20 Watts) | | **Speed** | ~2700 to 3100 RPM | | **Airflow** | ~90 to 105 CFM (Cubic Feet per Minute) | | **Noise Level** | ~40 to 45 dB(A) | | **Frame Material** | Aluminum Die-cast | | **Impeller Material** | Plastic (UL 94V-0) | --- ## Electronic Components & Features ### 1. The Motor Type The W2AC-AC4B-R utilizes a **Shaded Pole Motor** or a **Capacitor-Run Induction Motor**. - **AC Operation:** Unlike DC fans that use a PCB for commutation, this fan relies on the frequency of the AC line (50/60Hz) to determine rotation speed. - **Robustness:** Because it lacks complex integrated circuits (ICs) sensitive to static, it is highly durable in harsh electrical environments. ### 2. Wiring and Connection (The "R" Suffix) - **Termination:** The "R" in the suffix usually denotes **Lead Wires** rather than terminals. - **Color Coding:** Typically follows standard AC wiring: - **Black/Black:** Standard AC input (non-polarized). - **Green/Yellow:** Ground/Earth wire (attached to the metal frame for safety). ### 3. Thermal Protection The motor is equipped with **Impedance Protection**. - If the fan blades are obstructed (locked rotor), the internal impedance of the windings is high enough to prevent the motor from drawing excess current and catching fire. It can remain stalled for long periods without permanent damage. ### 4. Bearing System It uses **Dual Ball Bearings**. - **Electronic impact:** Ball bearings are preferred over sleeve bearings in this electronic assembly because they offer a longer Life Expectancy (approx. 40,000 to 60,000 hours at 60°C). --- ## Safety and Standards As an industrial electronic part, it complies with: - **UL/cUL Recognized:** Safety standards for electric fans. - **RoHS:** Restriction of Hazardous Substances. - **CE Marking:** Compliance with European safety, health, and environmental protection requirements.