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What Is Cooling Tower Gear Box Motor
Views: 0 Author: Lisa Publish Time: 2025-12-11 Origin: Site
A cooling tower gearbox motor refers to the motor + gearbox assembly that drives the cooling tower fan. This is the most common drive system used in large induced-draft cooling towers (EVAPCO, BAC, Marley).
Below is a clear explanation.
⭐ What is a Cooling Tower Gearbox Motor?
A cooling tower gearbox motor is a fan motor that connects to a gearbox, which then drives the large cooling tower fan at a reduced speed with increased torque.
Why use a gearbox?
Cooling tower fans are large-diameter (6–30 ft) and need:
* High torque
* Low RPM (90–225 RPM)
But motors run at high RPM (900–1800 RPM).
The gearbox reduces the motor speed and increases torque to match the fan’s requirements.
⭐ Components in a Gearbox Motor System
1. Fan Motor
* TEFC or TEAO cooling tower duty motor
* Usually 10 HP – 100 HP (can be larger)
* Mounted outside or partially inside the fan deck
* Often inverter-duty for VFD control
2. Gearbox
* Right-angle gearbox,
* Common brands: Marley, Amarillo, Falk
* Typical ratios: 5:1, 6.3:1, 7:1, 10:1
3. Drive Shaft
* Vertical or horizontal stainless steel shaft
* Connects motor → gearbox
4. Fan Hub & Blades
* Attached to gearbox output shaft
⭐ How the Gearbox Motor Works
1. Motor rotates at high speed (e.g., 1780 RPM).
2. Power is transmitted via the driveshaft.
3. Gearbox reduces speed (e.g., 6.3:1 → fan runs at ~282 RPM).
4. Torque increases, allowing the large fan to move high airflow (CFM).
5. Fan pulls air through the cooling tower, enabling evaporation and heat rejection.
