Electric device drive assembly and cooling system for electric device drive

An electric device including a drive assembly comprising:

• a static axle, the static axle including an internal bore extending along a longitudinal axis of the axle;
• a stator assembly fixed to the static axle, the stator assembly having a pole and a coil around the pole;
• and
• a rotor assembly having a housing and a plurality of magnets coupled to the housing,
• wherein the stator assembly is positioned within the rotor assembly, and
• the housing is coupled to a drive mechanism.

A drive assembly for an electric device, the drive assembly comprising:

• a static axle including an internal bore containing a first flow path for a coolant fluid and a second flow path for the coolant fluid;
• a stator assembly fixed to the static axle, the stator assembly having a pole and a coil around the pole;
• and
• a rotor assembly having a housing and a plurality of magnets coupled to the housing;
• wherein the stator assembly is positioned within the rotor assembly, and
• the housing includes a drive mechanism.

A method for cooling a stator assembly fixed to a static axle that includes a first end and a second end opposite the first end, the method comprising:

• near the first end, receiving coolant fluid into an internal bore within the static axle;
• flowing the coolant fluid toward the second end;
• near the second end, changing the direction of flow of the coolant fluid;
• transferring thermal energy to the coolant fluid;
• and
• removing the coolant fluid from the internal bore near the first end.