The **W2AC-AA2B-R2** is a high-performance AC axial fan assembly, typically manufactured by **Sanyo Denki** under their "San Ace" brand. These fans are engineered for industrial applications requiring high airflow and reliability in cooling electronic cabinets and machinery. --- ### Technical Specifications The table below breaks down the core electrical and mechanical characteristics of the W2AC-AA2B-R2: | Parameter | Specification | | :--- | :--- | | **Rated Voltage** | 230V AC | | **Operating Voltage Range** | 180V to 264V AC | | **Frequency** | 50/60 Hz | | **Rated Input Power** | ~28W / 24W (at 50/60Hz) | | **Rated Speed** | ~2,700 / 3,100 RPM | | **Maximum Airflow** | ~141 / 166 CFM (Cubic Feet per Minute) | | **Noise Level** | ~46 / 50 dB(A) | | **Bearing Type** | Dual Ball Bearing | | **Frame Size** | 120mm x 120mm x 38mm | --- ### Key Electronic & Structural Features #### 1. Shaded Pole or Capacitor-Run Motor As an AC fan, this model utilizes an induction motor. These motors are brushless by design, which minimizes electromagnetic interference (EMI) and eliminates the wear associated with carbon brushes. #### 2. Thermal Protection The "R2" designation often implies a specific internal protection circuit. Most units in this series feature: * **Impedance Protection:** The motor is designed so that even if the rotor is locked (prevented from spinning), the internal resistance prevents the windings from reaching temperatures that would cause a fire. * **Insulation Class:** Typically Class B or E, rated for high-temperature environments. #### 3. Dual Ball Bearing System The electronic assembly is supported by high-precision dual ball bearings. Compared to sleeve bearings, these provide: * **Longevity:** L10 life expectancy of approximately 40,000 to 70,000 hours. * **Mounting Flexibility:** Can be mounted in any orientation (horizontal, vertical, or angled) without affecting performance. #### 4. Die-cast Aluminum Frame While not an "electronic part" per se, the aluminum frame acts as a heat sink for the internal motor windings, effectively dissipating thermal energy generated during operation to ensure the electronics do not overheat. --- ### Common Applications * **Server Racks:** Extracting heat from high-density computing equipment. * **Power Supplies:** Cooling large industrial UPS units. * **Control Panels:** Preventing heat buildup in PLC and automation cabinets. ---