Akademik Veri Yönetim Sistemi
IEEE Transactions on Magnetics, 2026 (SCI-Expanded, Scopus)
High power density permanent magnet (PM) motors used in industrial drone propulsion systems operate under severe thermal constraints due to compact structures and high electromagnetic loading. Effective thermal management is therefore essential to ensure reliable operation and prevent insulation degradation and magnet demagnetization. This paper presents a comparative thermal analysis of inner-rotor and outer-rotor high-power-density PM motors designed under identical geometric constraints and similar electromagnetic loading conditions. Loss distributions obtained from electromagnetic finite-element analysis are used as heat sources in a lumped-parameter thermal network model. The influence of stator epoxy impregnation on thermal behavior is investigated, and different air-cooling strategies for the inner-rotor motor housing are evaluated. In addition, axial and radial cooling fin configurations are analyzed using computational fluid dynamics to assess their impact on convective heat transfer. The results show that epoxy impregnation significantly reduces winding temperature, while the inner-rotor topology provides shorter thermal paths and lower stator temperatures compared to the outer-rotor configuration. Although axial fins improve cooling performance by approximately 6 °C, radial fins are preferred due to their simpler manufacturing process. Experimental measurements on a prototype motor validate the proposed thermal modeling approach.