1 -The circumferential cooling system, which provides highly effective, integrated but low-cost motor cooling, is introduced. This work is focussed particularly on magnetic effects, which arise from the special construction of the stator core. An explanation for the existence of inter-laminar flux is given and equations for the prediction of its absolute value are derived. Two approaches, an analytical and a numerical one, for the estimation of power losses due to inter-laminar flux are introduced. In agreement with the calculation results, measurements prove that power losses due to axial flux are very small and are not a concern for the design of a circumferentially cooled machine.
This paper demonstrates the impact of advanced, multiphysical material utilization on the efficiency of induction motors. Multifunctional utilization of the stator lamination in terms of integration of thermal and fluid-mechanical functions leads to significantly increased space for active material. Circumferential cooling combines multiphysical utilization of the stator lamination and significantly increased cooling surface. The paper shows that circumferentially cooled motors can reach the future premium efficiency class IE4 with the frame size of a standard TEFC motor.Index Terms -standard induction motors, premium efficiency, direct lamination cooling, circumferential cooling, advanced material utilization, thermal model.
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