Motor with split core stator with two support rings

1. A motor comprising:

a stator comprising a plurality of split cores configured to cooperatively define a ring shape, the stator further comprising a bobbin disposed around each of the split cores and a stator coil wound around the bobbin; and

support rings configured to surround outer circumferential surfaces of the split cores and to support upper and lower surfaces of the split cores,

wherein the support rings comprise:

an upper support ring configured to partially surround the outer circumferential surfaces of the split cores and to support the upper surfaces of the split cores; and

a lower support ring configured to partially surround the outer circumferential surfaces of the split cores and to support the lower surfaces of the split core, and

wherein the upper support ring comprises:

a first upper support portion configured to support the upper surfaces of the split cores;

a second upper support portion extending from the first upper support portion and configured to surround the outer circumferential surfaces of the split cores; and

an upper flange portion protruding from an outer circumferential surface of the second upper support portion,

wherein the upper support ring has a first opening at a radially inner portion of the first upper support portion, and a portion of the bobbin extends above the first upper support portion through the first opening.

2. The motor of claim 1 , wherein the upper support ring and the lower support ring have the same structure as each other.

3. The motor of claim 1 , wherein a gap is disposed between the outer circumferential surfaces of the split cores and the upper and lower support rings.

4. The motor of claim 1 , wherein

the split cores include guide grooves formed in the outer circumferential surfaces thereof and extending in an axial direction of the stator, and

at least one of the upper support ring or the lower support ring includes guide protrusions integrally formed on an inner circumferential surface of the at least one of the upper support ring or the lower support ring and respectively accommodated in the guide grooves.

5. The motor of claim 4 , wherein the guide protrusions comprise:

first guide protrusions formed on an inner circumferential surface of the second upper support portion and respectively accommodated in the guide grooves; and

second guide protrusions formed on an inner circumferential surface of the second lower support portion and respectively accommodated in the guide grooves.

6. The motor of claim 4 , wherein each of the guide grooves and the guide protrusions has a quadrangular cross-section.

7. The motor of claim 1 , comprising:

a fastening member configured to fasten the upper support ring and the lower support ring.

8. The motor of claim 7 , wherein the lower support ring comprises:

a first lower support portion configured to support the lower surfaces of the split cores;

a second lower support portion extending from the first lower support portion and configured to surround the outer circumferential surfaces of the split cores; and

a lower flange portion protruding from an outer circumferential surface of the second lower support portion and facing the upper flange portion.

9. The motor of claim 8 , comprising:

fixing holes respectively formed in the upper and lower surfaces of the split cores;

first fixing protrusions formed on an inner surface of the first upper support portion and respectively accommodated in the fixing holes formed in the upper surfaces of the split cores; and

second fixing protrusions formed on an inner surface of the first lower support portion and respectively accommodated in the fixing holes formed in the lower surfaces of the split cores.

10. The motor of claim 8 , wherein the lower support ring has a second opening at a radially inner portion of the first lower support portion, and a portion of the bobbin extends below the first lower support portion through the second opening.

11. The motor of claim 8 , wherein the fastening member fastens the upper flange portion and the lower flange portion.

12. The motor of claim 11 , wherein:

the upper flange portion includes an upper fastening hole formed therein; and

the lower flange portion includes a lower fastening hole formed therein,

wherein the fastening member is fastened to the upper fastening hole and the lower fastening hole.

13. The motor of claim 12 , comprising:

a housing configured to surround the support ring,

wherein the housing has a housing fastening hole to which the fastening member is fastened.