Electric motor with permanent magnets abutted by tabs in lamination cavities

An electric motor comprising:

• a stator;
• a rotor assembly comprising:
• a hollow rotor shaft;
• a differential gear assembly contained in the hollow rotor shaft;
• a lamination stack mounted on the hollow rotor shaft;
• a plurality of lamination cavities within the lamination stack, the lamination stack defining a plurality of tabs that extend into the plurality of lamination cavities;
• and
• a plurality of permanent magnets contained within the plurality of lamination cavities, wherein the plurality of tabs abut the plurality of permanent magnets;
• and
• a first planetary assembly positioned at a first end of the rotor assembly, and a second planetary assembly positioned at a second end of the rotor assembly, wherein the first and second planetary assemblies and the differential gear assembly are coaxially aligned.