Divided core of a motor
A divided core of a motor includes: a stator core comprising a plurality of core segments; a back yoke forming a circumference of the core segments; and teeth extending from the back yoke towards a radial direction of the back yoke, wherein the plurality of the core segments are disposed along an axial direction of the stator core, and there are some areas where the teeth are overlapped with each other when disposing the core segments.
1. A stator of a motor, the stator comprising:
a stator core comprising a plurality of core segments that are configured to define each phase of a 3-phase power motor or a single phase power motor and that are arranged along an axial direction of the stator core, each of the plurality of core segments comprising:
a back yoke that surrounds one of the plurality of core segments,
a tooth that extends from an inner circumferential surface of the back yoke along a radial direction of the back yoke, and
an insulator that surrounds at least a portion of the tooth,
wherein the teeth of the plurality of core segments overlap with one another in the axial direction based on the plurality of core segments being arranged along the axial direction of the stator core,
wherein each of the teeth of the plurality of core segments includes:
a main tooth that extends from the inner circumferential surface of the back yoke, and
divided teeth that are disposed on at least one of an upper side or a lower side of the main tooth in the axial direction,
wherein a total height of the main tooth and the divided teeth defines a height of the stator core in the axial direction,
wherein the stator core has a cylindrical shape having a recessed area,
wherein the back yoke of each of the plurality of core segments includes (i) an inner flat portion that is disposed at a connecting area of the inner circumferential surface of the back yoke connected to the teeth and (ii) an outer flat portion that defines the recessed area of the stator core and is disposed at an area of an outer circumferential surface of the back yoke corresponding to the connecting area, and
wherein the insulator includes (i) a planar portion that faces the inner flat portion and (ii) a bent portion that is bent along the inner circumferential surface of the back yoke.
2. The stator of claim 1 , further comprising coils that are wound around the main tooth and the divided teeth of each of the plurality of core segments,
wherein a height of the main tooth and the divided tooth is greater than a height of the back yoke in the axial direction of the stator core.
3. The stator of claim 1 , wherein a total height of the teeth of the plurality of the core segments defines the height of the stator core in the axial direction.
4. The stator of claim 1 , wherein a height of the main tooth defines a height of the back yoke in the axial direction.
5. The stator of claim 1 , wherein the plurality of core segments comprise:
a first core segment having the divided teeth disposed on both of the upper side and the lower side of the main tooth; and
second core segments each having the divided teeth disposed on one of the upper side or the lower side of the main tooth, and
wherein the state core comprises two or more of the second core segments that are disposed on different side surfaces of the first core segment along the axial direction.
6. The stator of claim 5 , wherein a total height of the first core segment and the second core segments defines the height of the stator core in the axial direction.
7. The stator of claim 5 , wherein one of the second core segments is disposed on an upper side of the first core segment and another of the second core segments is disposed on a lower side of the first core segment.
8. The stator of claim 5 , wherein the teeth of the first core segment are configured to, based on the plurality of core segments being stacked on one another along the axial direction, be arranged about a center axis of the stator core with a predetermined interval, and
wherein the inner circumferential surfaces of the back yokes define the inner circumferential surface of the stator core based on the plurality of core segments being stacked on one another along the axial direction.
9. The stator of claim 1 , wherein a portion of the main tooth or the divided tooth of one of the plurality of core segments protrudes from at least one of an upper surface or a lower surface of the back yoke, and is configured to insert into another of the plurality of core segments.
10. The stator of claim 1 , wherein the insulator extends in the axial direction along the plurality of core segments.
11. The stator of claim 1 , wherein the insulator extends away from a first side of the main tooth and a second side of the main tooth in a circumferential direction along the inner circumferential surface of the back yoke.
12. The stator of claim 1 , wherein a radial distance from a center of the back yoke to the outer flat portion is less than a radius of the back yoke defined by the outer circumferential surface of the back yoke with respect to the center of the back yoke.
13. A divided core of a motor, the divided core comprising:
a stator core comprising a plurality of core segments that are stacked on one another in an axial direction of the stator core, each of the plurality of core segments comprising:
a back yoke that surrounds one of the plurality of core segments,
a tooth that extends from an inner circumferential surface of the back yoke along a radial direction of the back yoke and that protrudes from the back yoke in the axial direction of the stator core,
an insulator that surrounds at least portion of the tooth, and
coils that are wound around the insulator, wherein the insulator is configured to insulate the tooth from the coils,
wherein a height of the tooth is greater than a height of the back yoke in the axial direction,
wherein each of the teeth of the plurality of core segments includes:
a main tooth that extends from the inner circumferential surface of the back yoke, and
divided teeth that are disposed on at least one of an upper side or a lower side of the main tooth in the axial direction,
wherein a total height of the main tooth and the divided teeth defines a height of the stator core in the axial direction,
wherein the stator core has a cylindrical shape having a recessed area,
wherein the back yoke of each of the plurality of core segments includes (i) an inner flat portion that is disposed at a connecting area of the inner circumferential surface of the back yoke connected to the teeth and (ii) an outer flat portion that defines the recessed area of the stator core and is disposed at an area of an outer circumferential surface of the back yoke corresponding to the connecting area, and
wherein the insulator includes (i) a planar portion that faces the inner flat portion and (ii) a bent portion that is bent along the inner circumferential surface of the back yoke.
14. The divided core of claim 13 , wherein a total height of the teeth of the plurality of core segments defines the height of the stator core.
15. The divided core of claim 14 , wherein the bent portion extends along a portion of the inner circumferential surface of the back yoke,
wherein a height of the bent portion corresponds to a height of the main tooth or the divided tooth of each of the plurality of core segments in the axial direction, and
wherein the bent portion is configured to insulate the coils from the inner circumferential surface of the stator core.
16. The divided core of claim 13 , wherein a height of the main tooth corresponds to the height of the back yoke.
17. The divided core of claim 13 , wherein the plurality of core segments comprise:
a first core segment having the divided teeth disposed on both of the upper side and the lower side of the main tooth; and
second core segments each having the divided teeth disposed on one of the upper side or the lower side of the main tooth, and
wherein the stator core comprises two or more of the second core segments that are stacked along the axial direction on different side surfaces of the first core segment.
18. The divided core of claim 17 , wherein a total height of the first core segment and the second core segments defines the height of the stator core in the axial direction.
19. The divided core of claim 17 , wherein one of the second core segments is disposed on an upper side of the first core segment and another of the second core segments is disposed on a lower side of the first core segment.
20. The divided core of claim 13 , wherein the teeth of the plurality of core segments are configured to, based on the plurality of core segments being stacked on one another along the axial direction, be arranged about a center axis of the stator core with a predetermined interval, and
wherein the inner circumferential surfaces of the back yokes define the inner circumferential surface of the stator core based on the plurality of core segments being stacked on one another along the axial direction.