LIQUID-COOLED ROTARY ELECTRIC MACHINE HAVING HEAT SOURCE-SURROUNDING FLUID PASSAGE

A liquid-cooled rotary electric machine including jacket defining a heat transfer surface in conductive thermal communication with a stator and having an axial end portion partially enclosing an interior volume. A heat source is in conductive thermal communication with a wall of the jacket axial end portion. A fluid channel traverses the heat transfer surface between opposite axial ends of the jacket. A fluid passage in fluid communication with the fluid channel is defined by jacket axial end portion walls and substantially surrounds the heat source in an imaginary plane perpendicular to the stator axis. At least a portion of heat transferable between the heat source and the fluid passage is convectively transferable between jacket axial end portion walls and liquid coolant along a flow path of liquid coolant through the machine. Also a method for liquid-cooling a rotary electric machine.