Understanding the TEWAC Motor

The TEWAC (totally enclosed water-air cooled) induction motor is not a new development. Such machines have long been common in Europe. Their usage in the United States has been less frequent, but growing emphasis on noise reduction is creating new interest in the inherently quiet TEWAC machine. Review of current specifications and orders shows that many motor users, inexperienced in TEWAC applications, are uncertain how to deal with possible cooler leakage, water flow control and monitoring, effects of high water temperature, motor rating versus ambient temperature, water chemistry, and cooler construction and mounting. Each of these matters is discussed in detail.