Rotor coupling ring

1. A rotor assembly, comprising:

a first rotor having a first plurality of tabs;

a second rotor having a second plurality of tabs, the second rotor coupled to the first rotor via the first plurality of tabs and the second plurality of tabs; and

a rotor coupling ring having an anti-rotation tab configured for disposition between an adjacent pair of tabs from one of the first plurality of tabs or the second plurality of tabs,

wherein the first rotor includes a first scallop positioned at a first circumferential location in a circumferential direction about the rotor assembly,

wherein the second rotor includes a first open space, in place of a first tab of the second plurality of tabs, at the first circumferential location and

wherein the anti-rotation tab is positioned within the first open space and between a first tab and a second tab of the first plurality of tabs.

2. The rotor assembly of claim 1 , wherein one or more tabs of the first plurality of tabs includes a first tab base portion and a first tab free end portion and one or more tabs of the second plurality of tabs includes a second tab base portion and a second tab free end portion configured to form a circumferential channel between the first rotor and the second rotor.

3. The rotor assembly of claim 2 , wherein the rotor coupling ring is configured for disposition within the circumferential channel.

4. The rotor assembly of claim 3 , wherein the rotor coupling ring includes a first free end and a second free end.

5. The rotor assembly of claim 4 , wherein the first free end of the rotor coupling ring is configured for positioning radially inward of and in contact with one or more tabs of the first plurality of tabs or the second plurality of tabs.

6. The rotor assembly of claim 5 , wherein the second free end of the rotor coupling ring is configured for positioning radially inward of and in contact with one or more tabs of the first plurality of tabs or the second plurality of tabs.

7. The rotor assembly of claim 6 , wherein the first free end defines a first hook and the second free end defines a second hook.

8. The rotor assembly of claim 7 , wherein the rotor coupling ring includes a counterbalance portion.

9. The rotor assembly of claim 8 , wherein the counterbalance portion is disposed substantially diametrically opposite the anti-rotation tab.

10. The rotor assembly of claim 1 , wherein the first scallop is configured to drain lubricant from the rotor assembly.

11. The rotor assembly of claim 10 , wherein the first rotor includes a second scallop configured to drain lubricant from the rotor assembly.

12. The rotor assembly of claim 11 , wherein the second scallop is disposed substantially diametrically opposite the first scallop at a second circumferential location and wherein the second rotor includes a second open space, in place of a second tab of the second plurality of tabs, at the second circumferential location.

13. The rotor assembly of claim 12 , wherein the first rotor includes a third scallop and a fourth scallop configured to drain lubricant from the rotor assembly, the fourth scallop disposed substantially diametrically opposite the third scallop.

14. The rotor assembly of claim 11 , wherein the first scallop and the second scallop are unobstructed in a radial direction by any tab of the second plurality of tabs.

15. A method of coupling a first rotor to a second rotor to form a rotor assembly, comprising:

interlocking a first plurality of tabs of the first rotor with a second plurality of tabs of the second rotor; and

locking the first plurality of tabs to the second plurality of tabs using a rotor coupling ring having an anti-rotation tab configured for disposition between an adjacent pair of tabs from the first plurality of tabs and a counterbalance portion disposed substantially diametrically opposite the anti-rotation tab,

wherein the first rotor includes a first scallop positioned at a circumferential location in a circumferential direction about the rotor assembly,

wherein the second rotor includes an open space, in place of a tab of the second plurality of tabs, at the circumferential location and

wherein the anti-rotation tab is positioned within the open space and between a first tab and a second tab of the first plurality of tabs.

16. The method of claim 15 , wherein interlocking the first plurality of tabs of the first rotor with the second plurality of tabs of the second rotor includes establishing a circumferential channel that opens in a radially inward direction between the first plurality of tabs and the second plurality of tabs.

17. The method of claim 16 , wherein locking the first plurality of tabs of the first rotor to the second plurality of tabs of the second rotor includes inserting the rotor coupling ring into the circumferential channel.