Document Type : Original Article
Authors
1 دانشگاه صنعتی مالک اشتر
2 Malek-e Ashtar, Isfahan, Iran
3 Department of Mechanical Engineering, University of Malek-e Ashtar, Isfahan, Iran
Abstract
This study focuses on the thermal analysis of the cooling system for a specific type of enclosed motor pump. According to the IEC standard, the winding insulation has a specific temperature tolerance; exceeding this limit can damage the insulation and impair motor function. A crucial component of the motor's cooling system is the waterjacket, which serves two purposes: cooling the motor housing and cooling the flow passing through the motor interior. Reducing the motor housing temperature ultimately lowers the winding temperature. To simplify calculations, a thermal analysis of the enclosed motor housing was performed, considering temperature and thermal boundary conditions. The effect of the waterjacket at various flow rates 0.1, 0.3, and 0.5 kg/s and the coil flow at flow rates of 0.05, 0.1, and 0.15 kg/s, along with different diameters, were investigated to determine temperature and pressure drop. The heat generated in different motor components was applied as a heat flux on the inner surface of the motor housing. The results show that increasing the waterjacket flow rate consistently reduces the housing temperature and the coil outlet fluid temperature. Conversely, increasing the coil flow rate increases the coil outlet temperature. Using a water-antifreeze mixture compared to pure water slightly increases the minimum housing temperature. The minimum housing temperature consistently occurs at a coil flow rate of 0.05 kg/s and a waterjacket flow rate of 0.5 kg/s. The pressure drop always increases with increasing waterjaket flow rate
Keywords
)