Abstract: A motor assembly including: a housing that forms an accommodating space therein; a stator that is provided inside the housing; and a rotor that is rotatable with respect to the stator, wherein the housing includes: a cooling water passage through which cooling water exchanges heat while moving therein; and an air flow passage through which air inside the accommodation space exchanges heat while moving through the housing in the axial direction. Accordingly, the air inside the housing can be cooled to a preset temperature or less.

Abstract: An electric motor of the present disclosure may include: a housing; a stator positioned inside the housing; and a rotor positioned inside the stator, wherein the stator may include: a core having a hollow cylindrical shape, the core including a slot formed by penetrating both ends of the core in an axial direction of the core; a coil wound around the slot and through which a current flows; and a sleeve extending along the slot and covering a lateral surface of the coil, the sleeve forming a path between the sleeve and the coil, wherein the core may include a hole formed from an outer circumferential surface of the core toward the slot, and communicating with the path of the sleeve, wherein the housing may include an oil inlet formed at the housing.

Abstract: A motor assembly including: a housing that forms an accommodating space therein; a stator that is provided inside the housing; and a rotor that is rotatable with respect to the stator, wherein the housing includes: a cooling water passage through which cooling water exchanges heat while moving therein; and an air flow passage through which air inside the accommodation space exchanges heat while moving through the housing in the axial direction. Accordingly, the air inside the housing can be cooled to a preset temperature or less.