Rotor assembly having liquid cooling

A liquid-cooled rotor assembly for a rotary electric machine, comprising:

• a rotatively-supportable shaft defining a central axis about which said rotor assembly is rotatable, said shaft provided with a fluid passageway receivable of a liquid coolant;
• a substantially cylindrical rotor core disposed about said central axis and rotatable in unison with said shaft, said rotor core having axially opposite ends, said rotor core provided with a plurality of passages, each said rotor core passage terminating at a void in a said rotor core axial end;
• and
• a plurality of permanent magnets distributed about said central axis, each magnet of said plurality of magnets disposed in a said rotor core passage, a gap defined between said each magnet and its respective said rotor core passage, said shaft fluid passageway in fluid communication with said rotor core end voids through said gaps, whereby said rotor core and said plurality of magnets are convectively cooled by liquid coolant receivable by said shaft fluid passageway and delivered to a said rotor core end through said rotor core passages.