The **125LS20-R** is a specific model of an **AC Axial Fan**, typically manufactured by companies like **Orion Fans**. These components are designed for thermal management and cooling in electronic enclosures, server racks, and industrial machinery. --- ### 1. Technical Specifications Below are the primary electrical and physical characteristics of the 125LS20-R: | Parameter | Specification | | :--- | :--- | | **Input Voltage** | 230V AC (50/60Hz) | | **Input Power** | ~20 Watts | | **Airflow** | ~110 - 125 CFM (Cubic Feet per Minute) | | **Speed** | ~2500 - 2900 RPM | | **Noise Level** | ~45 - 50 dB | | **Dimensions** | 120mm x 120mm x 38mm | | **Bearing Type** | Sealed Sleeve Bearing | | **Termination** | Lead Wires (Standard) | --- ### 2. Internal Electronic Construction The fan consists of several key sub-components that work together to provide consistent airflow: #### A. Shaded Pole Induction Motor The "LS" series usually utilizes a **shaded pole motor**. - **Stator:** Consists of copper windings wrapped around a laminated steel core. - **Rotor:** A permanent magnet or induction cage that spins the blades. - **Safety:** These motors are typically **impedance protected**, meaning the motor can withstand a locked rotor condition without catching fire. #### B. Housing and Impeller - **Frame:** Made of die-cast aluminum, which acts as a heat sink for the motor. - **Blades:** Usually made of PBT plastic (UL94V-0 rated) for fire safety and durability. #### C. Bearing System The **"LS"** designation often refers to a **Low Speed** or **Sleeve Bearing** configuration. - Sleeve bearings are quieter than ball bearings but have a slightly shorter lifespan in high-heat environments. - They rely on a film of oil to reduce friction. --- ### 3. Part Number Breakdown (Typical) While manufacturers vary slightly, the nomenclature generally follows this logic: | Code | Meaning | | :--- | :--- | | **125** | Series/Frame Size (approx. 120mm) | | **L** | Low Speed / Low Profile | | **S** | Sleeve Bearing | | **20** | 230V Voltage Class | | **-R** | RoHS Compliant / Environmental Standard | --- ### 4. Implementation Example To connect this fan to a power source, the following basic circuit logic is used: ```markdown [AC L] ---- (Black Wire) ---- [Fan Motor] ---- (Black Wire) ---- [AC N] | (Ground/Housing) ``` *Note: Since it is an AC fan, there is no polarity (positive/negative), but proper grounding to the aluminum frame is recommended for safety.*