Directly Cooled Windings - Conjugate heat transfer assessment of air-cooled hollow conductor

University essay from Lunds universitet/Industriell elektroteknik och automation

Abstract: The torque capabilities of electrical machines are today limited by magnetic saturation and the ability to transfer thermal loads away from the machine. A solution to thermal management in power turbo-generators involves hollow conductors allowing direct cooling of the heat source thus increasing the power density significantly. The work done in this master thesis investigates the pos- sibilities of implementing such cooling techniques in smaller electrical machines and predicts the current capabilities of directly cooled conductors. Experiments have been made on hollow conductors using compressed air as cooling fluid and mathematical models are used to predict the capabilities of using oil as coolant. Results show current density capabilities in excess of 30A/mm2. Results from experiments are compared to finite element studies and mathematical models to assess validity.

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