Electric machine including field coil separators having an integrated coolant flow path

An electric machine comprising:

• a housing including an interior;
• a stator arranged in the interior and fixedly connected to the housing, the stator including a stator core, and a plurality of stator windings supported by the stator core, the plurality of stator windings having a first end turn and a second end turn, the first end turn being axially spaced from the second end turn by the stator core;
• a rotor arranged in the interior and rotatably supported within the stator, the rotor comprising:
• a shaft including an outer surface section, an inner surface section defining a flow path, and an opening defining a passage extending from the flow path through the outer surface section, the shaft defining an axis of rotation of the rotor;
• a plurality of rotor laminations mounted to the outer surface section, the plurality of rotor laminations including an inner surface portion disposed on the shaft, an outer surface portion, and a plurality of rotor teeth, the plurality of rotor laminations include a plurality of coolant passages extending between the inner surface portion and the outer surface portion;
• a plurality of field coils disposed about corresponding ones of the plurality of rotor teeth, the plurality of coolant passages extending axially along the plurality of rotor laminations between adjacent ones of the plurality of field coils;
• and
• a plurality of field coil separators extending axially along the rotor between adjacent ones of the plurality of field coils, wherein each of the plurality of field coil separators includes a resilient frame and an outer shell over molded onto the resilient frame, the outer shell including an outer surface,
• wherein the resilient frame includes a base element, a first spring member configured to engage one of the plurality of field coils and a second spring member configured to engage an adjacent one of the plurality of field coils.