Abstract
Direct water cooling has, so far, been used only in large size turbo generators. The method might, however, offer interesting possibilities also in high torque applications. The performance of different cooling fluids for internal liquid cooling of stator windings is assessed. The arctic operating conditions of machines place special requirements for the fluid, and thus pure water can not be used for cooling. It is found that the use of anti-freezing substances studied decrease the performance of the cooling system. A fast computational model to asses these effects are proposed in this article.
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