Assembly method for liquid cooled permanent magnet rotor

A method of assembling a permanent magnet rotor for an electrical generator comprising:

• mounting an inner core component having a plurality of longitudinally extending core passages coaxially on a rotor shaft defining a first longitudinally extending shaft passage and a second longitudinally extending shaft passage;
• positioning a permanent magnet outer core component circumferentially about the inner core component;
• fluidly connecting a first rotor cooling circuit segment which includes the first longitudinally extending shaft passage with a second rotor cooling circuit segment which includes the plurality of longitudinally extending core passages via sealingly coupling a first liquid containment cover to a first axial end of the inner core component at a first mounting location which is radially inward of a cylindrical outer surface of the inner core component;
• and
• fluidly connecting the second rotor cooling circuit segment with a third rotor cooling circuit segment which includes the second longitudinally extending shaft passage via sealingly coupling a second liquid containment cover to a second axial end of the inner core component at a second mounting location which is radially inward of the cylindrical outer surface of the inner core component.