Motor having an impeller and a printed circuit board

1. A motor, comprising:

an inner housing defining an accommodation space;

an outer housing defining a flow path with the inner housing;

an impeller disposed at a first side of the inner housing;

a power portion that is disposed in the accommodation space and that includes a rotation shaft coupled to the impeller so as to be rotated together with the impeller;

a bracket coupled to the inner housing at a second side of the inner housing and rotatably supporting the rotation shaft; and

a printed circuit board (PCB) that is spaced apart from the bracket by a predetermined distance and that is electrically connected to the power portion,

wherein a circumference of the PCB includes a plurality of concave portions that are spaced apart from each other,

wherein the plurality of concave portions are recessed toward a center of the PCB such that fluid flowing by the impeller moves downstream by passing through the plurality of concave portions,

wherein the PCB includes a plurality of protrusions that protrude radially outward and that define a predetermined angle with each other,

wherein each end portion of the plurality of protrusions includes a plurality of connection pins extending toward the power portion,

wherein the plurality of connection pins are electrically coupled to the power portion,

wherein the bracket comprises:

a bracket body portion configured to accommodate the rotation shaft to rotatably support the rotation shaft, and

a plurality of bracket coupling portions protruding from an outer circumferential surface of the bracket body portion and extending toward the inner housing, and

wherein the plurality of connection pins extend toward the power portion between the bracket coupling portions adjacent to each other among the plurality of bracket coupling portions.

2. The motor of claim 1 , wherein each of the plurality of concave portions is provided between the plurality of protrusions that are adjacent to each other in a circumferential direction.

3. The motor of claim 1 , wherein the plurality of concave portions curve toward the center of the PCB.

4. The motor of claim 1 , wherein a portion of the plurality of concave portions that is closest to the center of the PCB is angled.

5. The motor of claim 1 wherein the power portion comprises:

a stator core that is spaced apart from the rotation shaft by a predetermined distance to surround the rotation shaft and that is coupled to the inner housing;

a stator coil wound around the stator core; and

an insulator coupled to the stator core between the stator core and the stator coil,

wherein a plurality of connection pin coupling portions are provided to protrude from an outer circumferential surface of a portion of the insulator facing the PCB, and

wherein the plurality of connection pins are inserted into the plurality of connection pin coupling portions to be electrically connected to the stator coil.

6. The motor of claim 1 , wherein the plurality of bracket coupling portions do not overlap the plurality of protrusions in an axial direction.

7. A motor, comprising:

an inner housing defining an accommodation space;

an outer housing defining a flow path with the inner housing;

an impeller provided at a first side of the inner housing;

a power portion that is disposed in the accommodation space and that includes a rotation shaft coupled to the impeller so as to be rotated together with the impeller;

a bracket coupled to the inner housing at a second side of the inner housing and rotatably supporting the rotation shaft; and

a printed circuit board (PCB) that is spaced apart from the bracket by a predetermined distance and that is electrically connected to the power portion,

wherein the PCB includes a plurality of protrusions that protrude radially outward and that have a predetermined angle with each other,

wherein the bracket comprises:

a bracket body portion configured to accommodate the rotation shaft to rotatably support the rotation shaft; and

a plurality of bracket coupling portions protruding from an outer circumferential surface of the bracket body portion and extending toward the inner housing,

wherein the plurality of bracket coupling portions overlap the plurality of protrusions in an axial direction,

wherein each of a plurality of concave portions is provided between the plurality of protrusions that are adjacent to each other in a circumferential direction, and

wherein the plurality of concave portions are recessed toward a center of the PCB such that fluid flowing by the impeller moves downstream by passing through the plurality of concave portions.

8. The motor of claim 7 , wherein a circumferential surface of each of the plurality of protrusions that surround the plurality of concave portions is curved toward the center of the PCB.

9. The motor of claim 7 , wherein a portion of the plurality of concave portions that is closest to the center of the PCB is angled.

10. The motor of claim 7 , wherein the plurality of bracket coupling portions are coupled to (i) the second side of the inner housing or (ii) the power portion.

11. The motor of claim 10 , wherein each end portion of the plurality of protrusions includes a plurality of connection pins extending toward the power portion.

12. The motor of claim 11 , wherein the plurality of connection pins pass through the plurality of bracket coupling portions to be electrically connected to the power portion.

13. The motor of claim 7 , wherein the bracket body portion has a cylindrical shape.

14. The motor of claim 7 , wherein the plurality of bracket coupling portions are spaced apart from each other.