Rotor for an electric motor

A hub for a rotor of a permanent magnet motor, the hub

• comprising:
• a hub body for supporting a plurality of permanent magnets and having:
• a central axis of rotation,
• a fluid inlet for receiving a fluid coolant,
• a fluid outlet for outputting the fluid coolant, and
• fluid conduits which are coupled to the fluid inlet and the fluid outlet, wherein the fluid conduits define a set of separate fluid paths, each fluid path of the set extending radially outwardly to a region radially beneath a respective magnet of the plurality of permanent magnets, and then radially inwardly,
• wherein the hub body includes a central chamber for receiving fluid coolant from the fluid inlet, with each fluid path extending along a respective separate channel directly connected to the central chamber, and
• wherein the central chamber includes a plurality of vanes for imparting rotational velocity to fluid coolant flowing through the central chamber before the fluid coolant transitions from the central chamber into the channels.