The **W2AC-AA4A-R** is a specific part number belonging to the **W2AC series** of high-performance **AC cooling fans**, typically manufactured by **Sanyo Denki** (San Ace line) or similar industrial thermal management suppliers. Below is a breakdown of its technical specifications and electronic characteristics. ### 1. General Specifications This component is an industrial-grade axial fan designed for high airflow and reliability in enclosures or machinery. | Feature | Specification | | :--- | :--- | | **Type** | AC Axial Fan | | **Voltage** | 100V - 120V AC (typically 115V) | | **Frequency** | 50/60 Hz | | **Frame Size** | Approximately 120mm x 120mm x 38mm | | **Bearing Type** | Dual Ball Bearing (for long life) | | **Material** | Aluminum Frame / Plastic Impeller (UL94V-0) | --- ### 2. Key Electronic Parts & Components The internal construction of the W2AC-AA4A-R consists of several critical electronic sub-assemblies: #### A. Shaded Pole or Capacitor-Run Motor * **Motor Type:** Most fans in this series use a permanent split capacitor motor or a shaded-pole induction motor. * **Stator:** Comprised of copper windings around a laminated steel core. * **Rotor:** A permanent magnet or induction rotor attached to the fan blades. #### B. The Bearing System * **Dual Ball Bearings:** Unlike sleeve bearings, ball bearings allow the fan to be mounted in any orientation (horizontal, vertical, or angled) without affecting the lifespan. #### C. Safety & Protection Features * **Impedance Protection:** The motor is designed so that if the fan blade is physically blocked (locked rotor), the internal resistance of the windings prevents the motor from overheating or catching fire. * **Burnout Protection:** Built-in thermal cut-offs are common in this series to disconnect power if temperatures exceed safety limits. --- ### 3. Electrical Connection Interface The "R" suffix and "AA4A" designation often refer to the termination style: * **Terminals:** This model usually features **spade terminals** (fast-on connectors) rather than lead wires. This allows for quick installation and replacement in server racks or industrial cabinets. * **Grounding:** The aluminum frame includes a grounding point to prevent ESD (Electrostatic Discharge) buildup. --- ### 4. Application Use Cases Due to its robust AC-driven nature, this part is commonly found in: 1. **Server Racks:** To exhaust hot air from high-density computing environments. 2. **Industrial Control Panels:** Cooling PLCs and power supplies. 3. **Medical Equipment:** High-reliability cooling for diagnostic machines. 4. **Power Inverters:** Managing heat in large-scale UPS systems.