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A TEWC enclosure on a motor means "Totally Enclosed, Water Cooled".
TEWC motors are very rare, but are useful in two key areas:
The TEWC motor is constructed with a double shell body, through which flows water. The water removes the heat very efficiently, needing only 4 to 8 liters per minute to remove the waste heat from a 100 horsepower (75 kW) motor. This water may then be sent to a drain or a heat exchanger.
Notice that these motors are usually custom built, so they are very expensive. However, they are inherently capable of being customized for a wide variety of difficult applications, so they should be considered in odd circumstances.