The **W2AC-A31A-R2** is a specialized electronic component, typically categorized as a high-performance **AC Axial Fan** manufactured by **Sanyo Denki** (San Ace series). These fans are designed for thermal management in industrial equipment, servers, and power supplies. --- ### 1. Technical Specifications The following table outlines the primary electronic and physical characteristics of the W2AC-A31A-R2: | Feature | Specification | | :--- | :--- | | **Input Voltage** | 100V - 115V AC (Single Phase) | | **Frequency** | 50/60 Hz | | **Input Power** | ~18W (at 60Hz) | | **Rated Speed** | 2,700 - 3,100 RPM | | **Max Airflow** | ~100 - 110 CFM (Cubic Feet per Minute) | | **Noise Level** | ~40 - 45 dB(A) | | **Bearing Type** | Dual Ball Bearing | | **Frame Size** | 120mm x 120mm x 38mm | --- ### 2. Key Electronic Components & Design The internal architecture of this unit consists of several critical electronic sub-assemblies: #### A. The Shaded Pole Motor Unlike DC fans that use brushless controllers, this AC fan typically utilizes a **shaded-pole induction motor**. * **Stator:** Laminations of silicon steel with copper windings. * **Rotor:** A squirrel-cage design that reacts to the induced magnetic field. #### B. Thermal Protection The "R2" designation often implies specific revisions or safety features. It includes an **Impedance Protection** circuit. This ensures that if the fan blades are locked (preventing rotation), the internal windings are designed to resist burning out by limiting the current draw. #### C. Bearing System It utilizes a **Dual Ball Bearing** system. Electrically, this reduces friction-related heat, which prevents the lubricant from drying out, thereby extending the "Mean Time Between Failure" (MTBF) to approximately 40,000 to 70,000 hours. --- ### 3. Wiring and Connection The W2AC-A31A-R2 usually features a simple 2-wire lead or terminal connection: 1. **Lead Wires:** Typically UL1007 AWG24 wires. 2. **Polarity:** Since it is AC, there is no strict positive/negative, but standard practice follows **Line (L)** and **Neutral (N)**. 3. **Grounding:** Many models include a grounding point on the aluminum die-cast frame to prevent ESD (Electrostatic Discharge) buildup. --- ### 4. Applications * **Control Cabinets:** Cooling PLCs and industrial relays. * **Medical Equipment:** Reliable heat dissipation for imaging or diagnostic tools. * **Networking:** Cooling for 19-inch rack-mount servers.