Electric propulsor with electric machine in thermal communication with a heat exchanger

An electric propulsor, comprising:

• a core cowl;
• an outer cowl, a first air flowpath being defined outward of the outer cowl and a second air flowpath being defined between the core cowl and the outer cowl;
• one or more electric machines disposed in the core cowl;
• a fan having a plurality of fan blades, the fan being rotatably drivable by at least one of the one or more electric machines in the core cowl;
• a booster having a plurality of airfoils disposed at least in part in the second air flowpath between the core cowl and the outer cowl, the booster being rotatably drivable by at least one of the one or more electric machines in the core cowl for compressing air flowing along the second air flowpath;
• and
• a heat exchanger disposed within the second air flowpath downstream of the booster between the core cowl and the outer cowl, the heat exchanger being in thermal communication with at least one of the one or more electric machines,
• wherein the core cowl defines a third air flowpath in flow communication with the second air flowpath having an inlet downstream of the booster and upstream of the heat exchanger, the third air flowpath being defined so as to allow air flow from the second air flowpath to the one or more electric machines.