The **W2SP-1B4-R** is a specific part number belonging to the **W2S series** of AC axial fans, typically manufactured by **ebm-papst**. This component is widely used in cooling applications for electronics cabinets, server racks, and industrial machinery. --- ## 1. Technical Specifications Below are the primary electronic and mechanical characteristics of the W2SP-1B4-R: | Parameter | Specification | | :--- | :--- | | **Type** | AC Axial Compact Fan | | **Nominal Voltage** | 115 VAC | | **Frequency** | 50 / 60 Hz | | **Power Consumption** | ~11 Watts | | **Current Draw** | ~0.13 A | | **Rated Speed** | 2700 - 3200 RPM | | **Air Flow** | ~28.8 CFM (49 m³/h) | | **Bearing Type** | Ball Bearing | | **Connection** | 2 Lead Wires | --- ## 2. Key Electronic Features ### A. Shaded-Pole Motor The W2SP-1B4-R utilizes a **shaded-pole AC motor**. This is a type of self-starting single-phase induction motor. It is preferred for fan applications because: * **Simplicity:** It does not require a start capacitor. * **Reliability:** Fewer electronic components mean a lower failure rate. * **Cost-Effective:** Ideal for low-torque applications like moving air. ### B. Impedance Protection One critical electronic safety feature is **impedance protection**. * If the fan blades are physically blocked (locked rotor), the internal impedance of the motor windings limits the current flow. * This prevents the motor from overheating or catching fire during a stall, eliminating the need for additional thermal fuses in many scenarios. ### C. Electromagnetic Compatibility (EMC) Because it is an AC induction motor without brushes, it generates very little electromagnetic interference compared to DC brushed motors. This makes it suitable for sensitive laboratory or medical environments. --- ## 3. Physical Construction * **Housing/Frame:** Typically made of die-cast aluminum for heat dissipation and structural rigidity. * **Impeller:** Usually made of plastic (PA 6.6), reinforced with fiberglass. * **Direction of Rotation:** Clockwise, looking at the rotor. * **Environmental Protection:** Designed for indoor use with standard humidity levels (IP20 rating). --- ## 4. Typical Applications * **Power Supplies:** Cooling internal transformers and rectifiers. * **Server Racks:** Maintaining airflow in small networking enclosures. * **Gaming/Vending:** Cooling logic boards in arcade machines or automated kiosks.