Cooling

Cooling arrangements are usually chosen to minimize machine cost. Other factors, such as the availability of cooling water, the need to minimize airborne noise, or space limitations, may influence the eventual choice. There exist many types (classes) of cooling. However, in DriveConstructor the choice is limited to the three classes presented below:

• air-cooled self-cooled, designated IC411
• air-cooled forced-cooled IC416 (forced ventilation independent from the shaft)
• water-cooled IC71W

Fig.1. IC411. ¹

Fig.2. IC416. Note separate motor for driving the fan. ¹

Fig.3. IC71W. ²

Fig. 4 shows that IC416 provides more load capacity at low speeds than IC411. It is because the independently fed fan motor of IC416 configuration allows maintaining the cooling air flow independently on the rotor speed.

Fig.4. IC411 vs IC416. ³

Water-cooled machines can be 20-40% smaller than air-cooled IP54/55 machines. If cooling water is available, some economies in motor size can be obtained by the use of water-cooling.

¹ Source: Global Electric ² Source: “Three-phase induction motors, WGM line, water jacket cooling” brochure by Weg ³ Source: ABB