The **W2AP-31Y-R2/UL** is a high-performance **Industrial AC Cooling Fan** manufactured by **Sanyo Denki** (San Ace series). It is specifically designed for high-reliability thermal management in industrial equipment, server racks, and control panels. Below is a detailed breakdown of its electronic and mechanical parts. ### 1. Technical Specifications Table | Feature | Specification | | :--- | :--- | | **Input Voltage** | 100V / 115V AC (Dual compatibility) | | **Frequency** | 50 / 60 Hz | | **Current / Power** | 0.22A / 18W (Approximate at 60Hz) | | **Speed** | 2,700 - 3,100 RPM | | **Airflow** | ~90 - 105 CFM (Cubic Feet per Minute) | | **Bearing Type** | Dual Ball Bearing | | **Frame Material** | Aluminum Die-cast | | **Impeller Material** | Plastic (UL 94V-0 Flame Retardant) | --- ### 2. Key Electronic Components The "R2/UL" suffix indicates specific safety certifications and wiring configurations. #### A. The AC Induction Motor Unlike DC fans that use a PCB with a driver IC, this fan uses a **Shaded-Pole** or **Capacitor-run AC motor**. * **Stator:** Consists of copper windings wrapped around a laminated steel core. * **Rotor:** A permanent magnet or squirrel-cage structure that reacts to the AC magnetic field. #### B. Bearings (Mechanical/Electronic Support) It utilizes **Dual Ball Bearings**. * **Electronic benefit:** High-quality ball bearings reduce friction and heat, which prevents the motor windings from overheating and ensures a longer MTBF (Mean Time Between Failures), typically rated for 40,000 to 60,000 hours. #### C. Protection Circuits * **Burnout Protection:** The motor is "impedance protected." This means the resistance of the windings is high enough that if the fan is physically locked (rotor lock), the current will not rise high enough to melt the insulation or cause a fire. * **UL/CSA Certification:** The "UL" in the part number signifies it meets Underwriters Laboratories safety standards for electrical insulation and fire resistance. --- ### 3. Wiring and Physical Interface The "31Y" series typically features a terminal-style or lead-wire connection depending on the specific sub-variant. * **Frame:** The 120mm x 120mm x 38mm aluminum frame acts as a heat sink for the motor itself. * **Terminals:** Usually two fast-on terminals or two lead wires for Live (L) and Neutral (N). Since it is an AC fan, there is typically no polarity, but grounding the aluminum frame is recommended for safety. --- ### 4. Part Number Breakdown | Segment | Meaning | | :--- | :--- | | **W2** | Series designation (San Ace AC Fan) | | **AP** | High-performance AC motor type | | **31Y** | Size (120mm) and Speed category | | **R2** | Design revision / Revision 2 | | **UL** | UL/cUL Safety certification | ---