Many studies on cooling performance enhancement of rotating machines have been continuously performed to increase power density and insulation life. In this study, thermal-fluid analysis considering electrical loss, thermal resistance, cooling fan per...
Many studies on cooling performance enhancement of rotating machines have been continuously performed to increase power density and insulation life. In this study, thermal-fluid analysis considering electrical loss, thermal resistance, cooling fan performance was carried out to evaluate temperature rise of totally enclosed fan-cooled motor. From the analysis result, we investigated flow structures reducing cooling efficiency, such as bending loss, reverse flow and flow separation. In order to attenuate these negative phenomena, we improved structural design for fan-cover, frame and end-shield of the motor. As a result, temperature rise of the motor’s stator winding was decreased by 7.5%.