Electric motor and electric vehicle having the same

1. An electric vehicle comprising:

a body;

a plurality of wheels provided at the body;

an electromotor to drive at least one wheel, the electromotor including,

a frame,

a stator disposed in the frame,

a rotor disposed to be rotatable with respect to the stator, and

an engaging portion that restricts the stator from moving with respect to the frame in a circumferential direction, the engaging portion including at least one rib protruding from one of surfaces of the frame and the stator, and at least one rib accommodation portion formed at an other opposing surface of the surfaces of the frame and the stator, wherein the at least one rib and the at least one accommodation portion are engaged to allow heat to be transferred therebetween, wherein the frame has a length longer than the stator in an axial direction, wherein the frame has one of the at least one rib and the at least one rib accommodation portion, which has the same length as the length of the frame, and wherein at least one cooling path is formed at the frame;

a battery provided in the body; and

an inverter coupled between the battery and the electromotor, the inverter including a plurality of elements to convert direct current (DC) power to alternating current (AC) power.

2. The electric vehicle of claim 1 , wherein a surface of the at least one rib makes contact with a surface of the at least one rib accommodation portion.

3. The electric vehicle of claim 1 , wherein the at least one rib comprises a plurality of ribs formed to be spaced from each other by a predetermined pitch at one of the surfaces of the frame and the stator.

4. The electric vehicle of claim 1 , wherein the at least one rib accommodation portion comprises a plurality of rib accommodation portions formed to be spaced from each other by a predetermined pitch at one of the surfaces of the frame and the stator.

5. The electric vehicle of claim 1 , wherein the at least one cooling path is formed at the at least one rib.

6. The electric vehicle of claim 1 , wherein the at least one cooling path is formed at the frame in a vicinity of the at least one rib accommodation portion.

7. The electric vehicle of claim 1 , wherein the at least one cooling path comprises a plurality of cooling paths, each cooling path penetrating the frame from one end surface to another end surface of the frame.

8. The electric vehicle of claim 7 , further comprising:

at least two covers, one cover covering the one end surface of the frame and another cover covering the another end surface of the frame; and

at least one communication portion formed at one of the at least two covers, wherein the at least one communication portion connects at least two of the cooling paths.

9. The electric vehicle of claim 8 , further comprising:

at least one inlet in fluid communication with at least one of the cooling path;

at least one outlet in fluid communication with the at least one of the cooling path; and

a cooling fluid circulation circuit coupled to the at least one of the inlet and the at least one of the outlet to form a fluid flow path.

10. A motor for an electric vehicle comprising:

a frame;

a stator disposed in the frame;

a rotor disposed to be rotatable with respect to the stator; and

an engaging portion that restricts the stator from moving with respect to the frame in a circumferential direction, the engaging portion including at least one rib protruding from one of the surfaces of the frame and the stator, and at least one rib accommodation portion formed at other of the surfaces of the frame and the stator, wherein the at least one rib and the at least one accommodation portion are engaged to allow heat to be transferred therebetween.

wherein the frame has a length longer than the stator in an axial direction,

wherein the frame has one of the at least one rib and the at least one rib accommodation portion, which has the same length as the length of the frame, and

wherein at least one cooling path is formed at the frame.

11. The motor of claim 10 , wherein a surface of the at least one rib makes contact with a surface of the at least one rib accommodation portion.

12. The motor of claim 10 , wherein the at least one rib comprises a plurality of ribs formed to be spaced from each other by a predetermined pitch at one of the surfaces of the frame and the stator.

13. The motor of claim 10 , wherein the at least one rib accommodation portion comprises a plurality of rib accommodation portions formed to be spaced from each other by a predetermined pitch at one of the surfaces of the frame and the stator.

14. The motor of claim 10 , wherein the at least one cooling path is formed at the at least one rib of the frame.

15. The motor of claim 10 , wherein the at least one cooling path is formed at the frame in a vicinity of the at least one rib accommodation portion.

16. The motor of claim 10 , wherein the at least one cooling path comprises a plurality of cooling paths, each cooling path penetrating the frame from one end surface to another end surface of the frame.

17. The motor of claim 16 , further comprising:

at least two covers, one cover covering the one end surface of the frame and another cover covering the another end surface of the frame; and

at least one communication portion formed at one of the at least two covers, wherein the at least one communication portion connects at least two of the cooling paths such that a zigzag fluid flow path is formed.

18. The motor of claim 17 , further comprising:

at least one inlet in fluid communication with at least one of the cooling path; and

at least one outlet in fluid communication with at least one of the cooling path.