Electric machine rotor including helical keyway in cooperation with lamination core

An electric machine comprising:

• a rotor hub configured to rotate within a stator about an axis of rotation;
• a slot defined by the rotor hub, the slot skewed relative to the axis of rotation;
• a first stack of first laminations mounted to the rotor hub, the first laminations each including first tabs aligned parallel to the axis of rotation and arranged in groups of alternating widths, cooperation between relatively wide ones of the first tabs at opposite ends of the first stack and the slot restricts movement of the first stack relative to the rotor hub;
• a plurality of first magnets mounted to the first stack;
• a second stack of second laminations mounted to the rotor hub, the second laminations each including second tabs aligned parallel to the axis of rotation and arranged in groups of alternating widths, cooperation between relatively wide ones of the second tabs at opposite ends of the second stack and the slot restricts movement of the second stack relative to the rotor hub;
• and
• a plurality of second magnets mounted to the second stack,
• wherein the first stack is identical to the second stack, and the first stack is rotated relative to the second stack such that the first tabs and the second tabs are rotationally offset from each other about the axis of rotation.

An electric machine comprising:

• a stator including stator coils;
• a rotor hub within the stator and configured to rotate about an axis of rotation;
• a slot defined by the rotor hub, the slot skewed relative to the axis of rotation;
• a first stack of first laminations mounted to the rotor hub, the first laminations each including first tabs arranged in groups of alternating widths, cooperation between relatively wide ones of the first tabs at opposite ends of the first stack and the slot restricts movement of the first stack relative to the rotor hub;
• a plurality of first magnets mounted to the first stack;
• a second stack of second laminations mounted to the rotor hub, the second laminations each including second tabs arranged in groups of alternating widths, cooperation between relatively wide ones of the second tabs at opposite ends of the second stack and the slot restricts movement of the second stack relative to the rotor hub;
• and
• a plurality of second magnets mounted to the second stack,
• wherein the first tabs and the second tabs are rotationally offset from each other about the axis of rotation.