The permanent magnet (PM) propulsion motor is a critical power component in aviation electric propulsion systems

where efficient cooling technology is essential for enhancing motor performance and ensuring reliable operation. Compared with ground-based motors and conventional aviation motors

the cooling technologies for aviation PM propulsion motors face more stringent and specialized requirements and challenges

necessitating further research and breakthroughs. This paper first summarizes the characteristics

requirements

and classifications of cooling technologies from multiple dimensions. Considering the unique characteristics of aviation propulsion motors and their cooling systems

it systematically discusses the mechanisms

current research progress

applicability of thermal conduction

convective heat transfer

and phase-change heat transfer technologies for high power/torque density PM propulsion motors across various types of aviation electric propulsion systems. On this basis

the development trends of new cooling technologies for propulsion motors

integrated cooling of propulsion motors and inverters

and comprehensive thermal management for propulsion motors and propulsor units are systematically reviewed.