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This paper presents the results of an effort to improve the cooling performance of symmetrically self-ventilated induction machines in the 2-15 MW Range. Aerodynamic modifications are applied to the rotor inlet, the rotor bars, the stator bars and the stator cooling gap supports. The modificatiorts are tested in a rotating test r i g under labomtory conditions and in a prototype engine. The cooling mass flow and cooling eficiency are increased by more than 10%.

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