Split electric machine for retrofit hybrid propulsion systems

1. A device, comprising:

a first rotor segment as at least a portion of a unitary rotor;

a first stator segment;

a second stator segment, wherein the first stator segment and the second stator segment are configured to be directly coupled together circumferentially about a shaft, wherein the first stator segment and second stator segment when directly coupled together form at least a portion of a unitary stator circumferentially disposed about the shaft, wherein the unitary rotor is disposed about the unitary stator as part of a reluctance motor;

a first housing segment; and

a second housing segment, wherein the first housing segment and the second housing segment are configured to be directly coupled together circumferentially about the unitary stator, wherein the first housing segment and second housing segment when directly coupled together form at least a portion of a housing circumferentially disposed about the unitary stator.

2. The device of claim 1 , comprising a first rotor shaft collar segment coupled to a second rotor shaft collar to form at least a portion of a rotor shaft collar.

3. The device of claim 2 , wherein the rotor shaft collar is configured to directly couple the rotor shaft collar to the shaft.

4. The device of claim 2 , comprising a shim, wherein the shim is configured to couple the rotor shaft collar to the shaft.

5. The device of claim 2 , wherein the rotor shaft collar is configured to be directly coupled to the unitary rotor.

6. The device of claim 5 , wherein the rotor shaft collar comprises a first alignment feature and the unitary rotor comprises a second alignment feature, wherein the first alignment feature is configured to interface with the second alignment feature.

7. The device of claim 1 , wherein the first stator segment and the second stator segment when directly coupled together form at least a portion of a balanced polyphase source.

8. The device of claim 1 , wherein the first rotor segment comprises a first plurality of magnets, wherein the first stator segment comprises a first plurality of windings, wherein the second stator segment comprises a second plurality of windings, wherein the unitary stator is disposed about the unitary rotor.

9. The device of claim 1 , wherein the unitary rotor comprises a plurality of magnets buried inside of or disposed on at least one surface of the unitary rotor.

10. The device of claim 1 , comprising a bearing assembly comprising a bearing, wherein the housing comprises an end plate configured to directly contact the bearing.

11. The device of claim 1 , comprising a cooling system configured to cool the unitary stator during operation.

12. A device, comprising: a rotor shaft collar that when in operation is circumferentially disposed about a shaft, wherein the rotor shaft collar comprises a first rotor shaft collar segment directly coupled to a second rotor shaft collar segment;

a rotor that when in operation directly contacts and circumscribes the rotor shaft collar, wherein the rotor comprises a first rotor segment directly coupled to a second rotor segment; and

a stator that when in operation is disposed about the rotor, wherein the stator comprises a first stator segment directly coupled to a second stator segment.

13. The device of claim 12 , comprising a shim circumferentially directly coupled to the shaft and directly coupled to the rotor shaft collar.

14. A method, comprising:

disposing a first rotor segment as at least a portion of a unitary rotor about a shaft;

disposing a first stator segment about the shaft;

disposing a second stator segment about the shaft;

directly coupling the first stator segment and the second stator segment together circumferentially about the shaft to form at least a portion of a unitary stator circumferentially disposed about the shaft;

disposing a first housing segment about the shaft;

disposing a second housing segment about the shaft;

directly coupling the first housing segment and the second housing segment together circumferentially about the shaft to form a housing circumferentially disposed about the shaft;

coupling a first end plate segment as at least a portion of a first end plate to a first face of the unitary rotor; and

coupling a second end plate segment as at least a portion of a second end plate to a second face of the unitary rotor.

15. The method of claim 14 , comprising:

disposing a first rotor shaft collar segment about the shaft; and

disposing a second rotor shaft collar segment about the shaft.

16. The method of claim 15 , comprising:

directly coupling the first rotor shaft collar to the shaft;

directly coupling the second rotor to the shaft; and

directly coupling the first rotor shaft collar to the second rotor shaft collar to form at least a portion of a rotor shaft collar directly about the shaft.

17. The method of claim 15 , comprising:

directly coupling the first rotor shaft collar to a shim disposed about the shaft;

directly coupling the second rotor to the shim; and

directly coupling the first rotor shaft collar to the second rotor shaft collar to form at least a portion of a rotor shaft collar directly about the shim.

18. The method of claim 14 , comprising disposing a first bearing segment adjacent to the first end place segment as at least a portion of a bearing assembly.