Views: 0 Author: Lisa Publish Time: 2025-12-27 Origin: Site
A cooling tower motor specification defines the electrical, mechanical, and environmental requirements for a motor used to drive a cooling tower fan. Below is a standard, industry-accepted specification used for BAC, Marley, EVAPCO, SPX, and similar cooling towers.
| Item | Typical Requirement |
| Motor Type | 3-phase squirrel cage induction motor |
| Rated Power | 3 HP – 300 HP (2.2 – 225 kW) |
| Voltage | 380–415 V / 460 V / 575 V |
| Frequency | 50 Hz or 60 Hz |
| Rated Speed | 720 / 900 / 960 / 1450 / 1750 rpm |
| Duty | Continuous duty (S1) |
| Service Factor | ≥ 1.15 |
| Starting Method | DOL / Star-Delta / VFD |
| Efficiency | IE2 / IE3 (NEMA Premium preferred) |
| Item | Typical Requirement |
| Mounting | Horizontal or Vertical |
| Shaft Type | Solid, stainless steel preferred |
| Bearings | Sealed / regreasable, moisture-resistant |
| Thrust Bearing | Required for vertical motors |
| Drive Type | Direct drive / Gearbox / Belt drive |
| Rotation | CW or CCW (reversible) |
| Item | Typical Requirement |
| Enclosure | TEFC or TENV |
| Protection Class | IP55 minimum (IP56 / IP66 preferred) |
| Insulation Class | Class F (Class H recommended for VFD) |
| Ambient Temp | 40 °C standard, 50 °C preferred |
| Altitude | ≤ 1000 m (derate above this) |
| Corrosion Protection | Epoxy or polyester coating |
| Humidity | 95–100% RH, non-condensing |
| Feature | Requirement |
| Outdoor Rating | Mandatory |
| Moisture Protection | Drip-proof not acceptable |
| Shaft Seal | Water-resistant |
| Paint System | C5-M or equivalent (coastal/chemical plants) |
| VFD Compatibility | Inverter-duty insulation |
| Bearing Protection | Grease relief + labyrinth seal |
> Cooling Tower Fan Motor
> 30 HP, 3-phase, 415 V, 50 Hz
> 960 rpm, TEFC, IP55
> Class F insulation, SF 1.15
> Vertical shaft with thrust bearing
> Ambient 50 °C, continuous duty
> Epoxy-coated housing, stainless steel shaft
> VFD-ready, IE3 efficiency
❌ Using standard indoor motor
❌ IP44 or drip-proof enclosure
❌ No thrust bearing for vertical motor
❌ Service factor = 1.0
❌ No corrosion protection
