Rotor assembly having improved cooling path

Patent metadata

Field	Value
Publication number	US-10587167-B2
Application number	US-201615085035-A
Country	US
Kind code	B2
Filing date	Mar 30, 2016
Priority date	Aug 24, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A rotor assembly includes: coil turns each of which has a plurality of conductors stacked in a multilayer structure and includes a linear part interposed between teeth of a rotor body and formed in a longitudinal direction with ducts through which cooling fluid moves, and a curved part extending from the linear part and disposed in an arc shape on an outer circumferential surface of a spindle; and a turn insulator interposed between the conductors, and insulating the conductors from each other. The curved part may include a wave-shaped cooling path, which is formed in a longitudinal direction in a planar surface thereof, communicates with the ducts, and guides the cooling fluid to the ducts. Furthermore, through holes each of which is shorter than the duct are formed in the turn insulator at a position corresponding to the duct.

First claim

What is claimed is:

1. A rotor assembly, comprising:
a plurality of coil turns each comprising a plurality of conductors stacked in a multilayer structure, each of the coil turns including:
a linear part interposed between teeth of a rotor body, with a plurality of ducts formed through top and bottom sides of the linear part and aligned with each other in a direction of the stacking of the multilayer structure so that cooling fluid flows through the ducts; and
a curved part extending from the linear part and disposed in an arc shape enclosing an outer circumferential surface of a spindle, the curved part including a planar surface in which is formed a wave-shaped cooling path communicating with the ducts;

a turn insulator interposed between the conductors and configured to insulate the conductors from each other, the turn insulator having planar surfaces respectively facing opposing surfaces of adjacent conductors of the plurality of conductors; and
a plurality of arc-shaped slots formed in the opposing surfaces of the curved part of the adjacent conductors and respectively disposed between a plurality of connection parts connecting the plurality of arc-shaped slots, the plurality of arc-shaped slots forming a cooling path passing through the turn insulator and extending alternatingly on opposite sides of the turn insulator between the connection parts.

2. The rotor assembly according to claim 1 , wherein the connection parts are formed between the arc-shaped slots on each of the opposing surfaces of the curved part and have a streamlined edge to minimize flow resistance occurring when the cooling fluid flowing through the cooling path flows over the connection parts.

3. The rotor assembly according to claim 1 , wherein a height (A) of the connection parts is greater than a radius (D 2 ) of each of the slots.

4. The rotor assembly according to claim 1 , wherein the cooling path is configured according to one of
the slots having a same radius and being repeatedly formed between the connection parts, and
the slots having different radii and being alternately arranged between the connection parts.

5. The rotor assembly according to claim 1 , wherein the turn insulator comes into contact with each of the connection parts to insulate the connection parts of one conductor of the plurality of conductors from another conductor.

6. The rotor assembly according to claim 5 , wherein the turn insulator includes a planar surface through which a plurality of through holes are formed so as to communicate with the slots, respectively, and a closed portion corresponding to the connection parts.

7. A rotor assembly having an improved cooling path, comprising:
a coil turn comprising a pair of conductors forming a top layer and a bottom layer that directly face each other, the conductors being stacked in a multilayer structure, the coil turn including:
a linear part interposed between teeth of a rotor body, with a plurality of ducts formed through top and bottom sides of the linear part and aligned with each other in a direction of the stacking of the multilayer structure so that cooling fluid flows through the ducts; and
a curved part extending from the linear part and disposed in an arc shape enclosing an outer circumferential surface of a spindle, the curved part including a planar surface in which is formed a wave-shaped cooling path communicating with the ducts and comprising opposing cooling paths respectively formed in the top layer and the bottom layer as a plurality of slots respectively disposed between a plurality of connection parts connecting the plurality of slots.

8. The rotor assembly according to claim 7 , wherein the connection parts are formed on each of opposing surfaces of the curved part and have a streamlined edge to minimize flow resistance occurring when the cooling fluid flowing through the cooling path flows over the connection parts.

9. The rotor assembly according to claim 7 , wherein a height (A) of the connection parts is greater than a radius (D 2 ) of each of the slots.

10. The rotor assembly according to claim 7 , wherein the cooling path is configured according to one of
the slots having a same radius and being repeatedly formed between the connection parts, and
the slots having different radii and being alternately arranged between the connection parts.

11. A rotor assembly, comprising:
a rotor body;
teeth extending from an outer circumferential surface of the rotor body outward in a radial direction, the teeth separated by a space including an upper portion and a lower portion; and
a coil turn that is disposed in the upper portion of the space and is interposed and supported between the teeth, the lower portion of the space below the coil turn including a sub-slot through which the cooling fluid is drawn,
wherein the coil turn includes:
a plurality of conductors stacked in a multilayer structure, with a plurality of ducts formed through top and bottom sides of the conductors and aligned with each other in a direction of the stacking of the multilayer structure so that cooling fluid flows through the ducts, each duct of the plurality of ducts having first and second ends formed at opposite extremes of the duct in a longitudinal direction of the conductors; and
a turn insulator interposed between the conductors and configured to insulate the conductors from each other, the turn insulator having a structure defined by a plurality of through holes formed in the turn insulator,
wherein the plurality of through holes are configured to allow a flow rate of the cooling fluid at an inlet side of the structure to be greater than a flow rate of the cooling fluid at an outlet side of the structure,
wherein each through hole of the plurality of through holes is formed as a plurality of slits, each slit having two flat sides and two rounded ends in correspondence to a shape of the ducts, the plurality of slits including an inlet slit and an outlet slit arranged in the longitudinal direction, and
wherein the inlet slit has one rounded end disposed toward the inlet side at a position corresponding to the first end of one of the plurality of ducts, and the outlet slit has one flat side disposed toward the outlet side at a position corresponding to the second end of the one of the plurality of ducts.

12. The rotor assembly according to claim 11 , wherein the through holes are formed such that two slits each having a size of ½ of the duct are disposed at a position corresponding to each of the ducts.

13. The rotor assembly according to claim 12 , wherein the through holes are formed such that one of the through holes that is adjacent to a side at which cooling fluid is drawn into the sub-slot is larger than the other.

14. The rotor assembly according to claim 11 , wherein the through holes are formed such that three slits each having a size of ⅓ of the duct are disposed at a position corresponding to each of the ducts.

15. The rotor assembly according to claim 11 , wherein the through holes are formed such that two slits each having a length ratio of 1:2 are disposed at a position corresponding to each of the ducts.

16. The rotor assembly according to claim 15 , wherein the through holes are formed such that a larger one of the two slits is disposed adjacent to an inlet side at which the cooling fluid is drawn.

Assignees

• Doosan Heavy Ind & Construction Co Ltd
• Doosan Heavy Ind Constr Co Ltd

Inventors

• Kim Sung Ha
• Hwang Kye Ha

Classifications

• H02K3/24 Primary

  with channels or ducts for cooling medium between the conductors · CPC title

• H02K9/12

  wherein the cooling medium circulates freely within the casing · CPC title

• H02K3/38

  around winding heads, equalising connectors, or connections thereto · CPC title

• H02K1/32

  with channels or ducts for flow of cooling medium · CPC title

• H02K9/005 Primary

  Electricity · mapped topic