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New WEG high-efficiency motors for OEMs exporting to North America and Middle East

20 May 2010

The new NEMA W22 range of High and Premium efficiency three-phase electric motors from WEG come in 2, 4, 6 and 8-pole configurations, and exceed the requirements of the new IE2 (EFF1) High Efficiency, and IE3 (Premium) efficiency classes. Energy efficiency performance imrovements are the result of a new aerodynamic frame, which increases airflow and reduces operational temperatures. A repositioned motor terminal box also optimises airflow over the motor.

The W22 NEMA range of 60-Hz motors is initially available in frame sizes from 364T to 587T, with progressive introductions of smaller frame sizes planned. The range will appeal to exporting OEMs selling into North America and its environs, Canada, and also the Middle East, which uses large numbers of NEMA motors in its oil production activities.

The redesigned cooling system at the heart of the W22 design, not only improves energy performance across the life of the W22 motors, the increased airflow it generates across the motor also means fewer hotspots, and, therefore, higher reliability. In addition, lower temperatures further enhance the benefits of WEG´s WISE insulation system (international patents pending), which offers high resistance to temperature degradation. The exclusive WISE insulation system increases the dielectrical resistance of the W22 windings, allowing VFD operation up to 575V, without any requirements to modify the W22 motor.

The lifetime of the W22 motors is also improved through the use of a robust cast iron (FC-200) frame, which is the same class as Flameproof, and offers high resistance to corrosion. The frame is designed to improve heat exchange and provide high levels of mechanical strength to cater for the most critical applications.

In addition, protecting the motor is WEG’s new WSeal, which offers improved protection through a ‘V’Ring with double lip and metallic cap, and the motor casing, for example, is constructed from cast iron FC-200, which is the same class as Flameproof and which offers high resistance to corrosion.

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