Development of the high efficiency cooling structure of the liquid immersion cooling SR motor

Immersion cooling system is introduced. In this new cooling system, the coil is immersed with insulation cooling liquid and lower the temperature by using the mechanism of boiling heat transfer. However, It is necessary to abate and condense the bubbles generated by boiling. Therefore a pump-les cooling circulation mechanism, which utilize generated bubbles, is devised. To the principle and the performance is explicated to develop, thermal fluid analysis was introduced. As a result of experiment, the immersion cooling system using aluminum coil case has 70% reduction of thermal resistance from the existing system. From the results of the thermohydrodynamic analysis, the cooling performance was improved by using the proposed system. From the above, the influence on cooling performance of the new system cope with the increase in heat generation of the motor was clarified. Moreover, the thermal resistance between the heat source and the housing was reduced by filling liquid around the coil was verified from the experiment, also the effectiveness of the immersion cooling system was demonstrated.