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4 lip 2021 · This article will review four major enclosure options (ODP, WPII, TEWAC and TEAAC) for large- and medium-size electric motors (3,000 horsepower [hp] or larger) and a guide for selecting proper motor enclosure types while considering cooling methods, pros/cons, motor size, cost, reliability and site environments.
review four major enclosure options (ODP, WPII, TEWAC and TEAAC) for large- and medium-size electric motors (3,000 horsepower [hp] or larger) and a guide for selecting proper motor enclosure types while considering cooling methods, pros/cons, motor size, cost, reliability and site environments.
10 sie 2016 · TEAAC When the motor is outdoors and too big for a TEFC and when a WPII type is not acceptable for environmental reasons, a totally enclosed air-to-air cooled (TEAAC) enclosure is usually the next choice. The motor has a large air-to-air cooler on top so hot air created in the motor is circulated up and over the heat exchanger.
The most commonly used enclosures are the Open Drip Proof (ODP), Weather Protected Type I (WPI), Weather Protected Type I1 (WPII), Totally Enclosed Air to Air Cooled (TEAAC), Totally Enclosed Fan Cooled (TEFC), and Totally Enclosed Water to Air Cooled (TEWAC). They come with varying degrees of protection and cost.
The more common of these enclosure types are Open machines: Drip-Proof (ODP), and Weather Protected (WPI/WPII); Totally Enclosed machines: Fan Cooled (TEFC), Pipe-Ventilated (TEPV), Air Over (TEAO), Non-Ventilated (TENV), Air to Air (TEAAC), Water to Air (TEWAC), and Explosion-proof (XP); and those with encapsulated or sealed windings.
In terms of costs, WPII is the least expensive, and requires the most mainte-nance. A TEWAC costs 10% to 15% more for the same power rating, while a TEAAC costs about 30% more. Exceptions are 2 pole or 3,600 RPM@60 HZ motors which. are rarely used.
1 paź 2001 · WPII motors provide a higher degree of protection than WPI models and are usually used outdoors in mild-to-moderate climates. WPII motors have a hood on top, which directs air through three, 90-deg changes in direction prior to entering the motor.
