A fan motor comprising: a rotary shaft defining an axial line, an inner stator comprising an armature having a winding around a stator stack; an outer rotor rotating around the rotary shaft and comprising a rotor yoke and an excitation unit including a permanent magnet; and a vane wheel fixed to the rotor and including a plurality of vanes and a hub unit fixed to the rotary shaft, a stator base which forms the base of the stator, where the stator base is located at a lower position with respect to the hub unit, where the stator base is fixed on one axial side of the stator and the hub unit of the vane wheel is located on the opposite axial side of the stator, wherein a sloped surface is formed along an outer periphery of the stator base, the sloped surface being inclined so as to gradually increase an axial gap in a radially outward direction between the sloped surface and an axial edge of the rotor yoke, the said axial edge of the yoke facing the stator base, characterised in that the vanes of the vane wheel generate an airflow from the stator base toward the hub unit of the vane wheel, wherein a radial gap between the stator stack and the permanent magnet is 0.8 mm or wider, and within an effective range of electromagnetic induction between the winding and the permanent magnet, and wherein an axial end portion of the rotor yoke sticks out further axially towards the stator base with respect to an axial end portion of the permanent magnet. a rotary shaft defining an axial line, an inner stator comprising an armature having a winding around a stator stack; an outer rotor rotating around the rotary shaft and comprising a rotor yoke and an excitation unit including a permanent magnet; and a vane wheel fixed to the rotor and including a plurality of vanes and a hub unit fixed to the rotary shaft, a stator base which forms the base of the stator, where the stator base is located at a lower position with respect to the hub unit, where the stator base is fixed on one axial side of the stator and the hub unit of the vane wheel is located on the opposite axial side of the stator, wherein a sloped surface is formed along an outer periphery of the stator base, the sloped surface being inclined so as to gradually increase an axial gap in a radially outward direction between the sloped surface and an axial edge of the rotor yoke, the said axial edge of the yoke facing the stator base, characterised in that the vanes of the vane wheel generate an airflow from the stator base toward the hub unit of the vane wheel, wherein a radial gap between the stator stack and the permanent magnet is 0.8 mm or wider, and within an effective range of electromagnetic induction between the winding and the permanent magnet, and wherein an axial end portion of the rotor yoke sticks out further axially towards the stator base with respect to an axial end portion of the permanent magnet. an outer rotor rotating around the rotary shaft and comprising a rotor yoke and an excitation unit including a permanent magnet; and a vane wheel fixed to the rotor and including a plurality of vanes and a hub unit fixed to the rotary shaft, a stator base which forms the base of the stator, where the stator base is located at a lower position with respect to the hub unit, where the stator base is fixed on one axial side of the stator and the hub unit of the vane wheel is located on the opposite axial side of the stator, wherein a sloped surface is formed along an outer periphery of the stator base, the sloped surface being inclined so as to gradually increase an axial gap in a radially outward direction between the sloped surface and an axial edge of the rotor yoke, the said axial edge of the yoke facing the stator base, characterised in that the vanes of the vane wheel generate an airflow from the stator base toward the hub unit of the vane wheel, wherein a radial gap between the stator stack and the permanent magnet is 0.8 mm or wider, and within an effective range of electromagnetic induction between the winding and the permanent magnet, and wherein an axial end portion of the rotor yoke sticks out further axially towards the stator base with respect to an axial end portion of the permanent magnet.