Squirrel cage induction machine rotor with enlarged connection region

A squirrel cage induction machine rotor comprising:

• a stack of rotor laminations, the stack comprising:
• a first rotor lamination, the first rotor lamination having a first bar opening with a first size;
• a second rotor lamination abutting the first rotor lamination at a first axial end of the stack, the second rotor lamination having a second bar opening with a second size, the second size greater than the first size;
• and
• a third rotor lamination abutting the first rotor lamination at a second axial end of the stack, the second axial end opposite to the first axial end, the third rotor lamination having a third bar opening with a third size, the third size greater than the first size;
• a first end ring at the first axial end of the stack;
• a second end ring at the second axial end of the stack;
• and
• a bar connecting the first end ring and the second end ring to each other, the bar extending through each of the second bar opening, the first bar opening and the third bar opening, wherein the bar has a first enlarged connection region defined by the second bar opening, and wherein the bar has a second enlarged connection region defined by the third bar opening.