Electric motor with integrated heat exchanger
Systems and methods for integrating a heat exchanger in an electric motor (EM) system that includes a stator and a rotor are presented. An oscillating heat pipe (OHP) is provided within a housing of the EM system. The OHP includes channel segments with a sealed working fluid. According to another aspect, channel segments formed within a core of the stator communicate with the channel segments of the housing to provide an OHP. According to another aspect, the core of the stator includes an OHP. According to another aspect, the housing includes protruding structures with embedded channel segments. According to one aspect, the protruding structures include a plurality of fins. According to yet another aspect, the protruding structures are in contact with a fluid coolant that flows in a cavity of a structure coupled to the housing.
1. An electric motor (EM) system with integrated heat exchanger, comprising:
a housing comprising:
a cylindrical shape with a longitudinal extension according to an axial direction;
surface area increasing features that protrude outward of the cylindrical shape of the housing; and
a first group of channel segments for provision of an embedded housing oscillating heat pipe (OHP), the first group of channel segments extending axially and circumferentially within the cylindrical shape of the housing and into the surface area increasing features; and
a core structure of a stator coupled along a region of the longitudinal extension of the housing,
wherein
the core structure comprises a second group of channel segments for provision of an embedded core OHP,
the first group of channel segments form a first continuous channel inside of the housing for provision of the housing OHP,
the second group of channel segments form a second continuous channel inside of the core structure for provision of the core OHP, and
the housing with the first group of channel segments and the core structure with the second group of channel segments form one monolithic structure.
2. The electric motor (EM) system with integrated heat exchanger of claim 1 , wherein:
the first continuous channel comprises a path that alternates between an inner circumference of the housing and an outer circumference of the housing.
3. The electric motor (EM) system with integrated heat exchanger of claim 2 , wherein:
alternations between the inner circumference of the housing and the outer circumference of the housing are according to a periodic pattern.
4. The electric motor (EM) system with integrated heat exchanger of claim 2 , wherein:
the surface area increasing features comprise any one or more of: a flat fin-shaped structure; a loop-shaped structure; an arch-shaped structure; or a combination thereof.
5. The electric motor (EM) system with integrated heat exchanger of claim 4 , wherein:
the flat fin-shaped structure includes channel segments of the first group of channel segments that form a continuous channel segment of the first continuous channel, and
the continuous channel segment includes a plurality of alternations between the inner circumference of the housing and the outer circumference of the housing.
6. The electric motor (EM) system with integrated heat exchanger of claim 4 , wherein:
the surface area increasing features comprise a plurality of the loop-shaped structure arranged according to a plurality of longitudinal arrays at different radial positions.
7. The electric motor (EM) system with integrated heat exchanger of claim 4 , wherein:
the loop-shaped structure includes channel segments of the first group of channel segments that form a continuous channel segment of the first continuous channel, and
the continuous channel segment includes one alternation between the inner circumference of the housing and the outer circumference of the housing.
8. The electric motor (EM) system with integrated heat exchanger of claim 1 , wherein:
a material of the monolithic structure is a metal comprising one of: steel; a titanium alloy; an aluminum alloy; or a superalloy.
9. The electric motor (EM) system with integrated heat exchanger of claim 8 , wherein:
the superalloy comprises one of: Ni—Cr-based superalloy; Ni-based superalloy; Co-based superalloy; or Cr-based superalloy.
10. The electric motor (EM) system with integrated heat exchanger of claim 1 , wherein:
a material of the monolithic structure is a polymer.
11. The electric motor (EM) system with integrated heat exchanger of claim 10 , wherein:
the polymer comprises one of: olyamides; polyethylene; acetal; ABS; polycarbonate; polyester; PTFE; PEEK; PEKK; polyamides; polyetherimide; or perfluoroalkoxy.
12. The electric motor (EM) system with integrated heat exchanger of claim 1 , wherein:
a material of the monolithic structure is a technical ceramic.
13. The electric motor (EM) system with integrated heat exchanger of claim 12 , wherein:
the technical ceramic comprises one of: aluminum oxide; aluminum nitride; boron carbide; magnesium oxide; silicon carbide; silicon nitride; tungsten carbide; zirconia; boron nitride; or aluminum oxynitride.
14. The electric motor (EM) system with integrated heat exchanger of claim 1 , further comprising:
a cavity structure coupled to a region of the housing that includes protrusions of the surface area increasing features, the cavity structure configured to contain a flowing fluid coolant in contact with the protrusions.
15. An electric motor (EM) system with integrated heat exchanger, comprising:
a housing comprising:
a cylindrical shape with a longitudinal extension according to an axial direction;
surface area increasing features that protrude outward of the cylindrical shape of the housing; and
a first group of channel segments for provision of an embedded housing oscillating heat pipe (OHP), the first group of channel segments extending axially and circumferentially within the cylindrical shape of the housing and into the surface area increasing features; and
a core structure of a stator coupled along a region of the longitudinal extension of the housing,
wherein
the core structure comprises a second group of channel segments for provision of an embedded core OHP,
the first group of channel segments comprise respective disjoint channel segments,
the second group of channel segments comprise respective disjoint channel segments, and
the respective disjoint channel segments of the first and second group of channel segments form a combined continuous channel that extends across the housing and the core structure.
16. The electric motor (EM) system with integrated heat exchanger of claim 15 , wherein:
the housing OHP and the core OHP are combined into a common OHP that is provided by the combined continuous channel.
17. The electric motor (EM) system with integrated heat exchanger of claim 15 , wherein:
the respective disjoint channel segments of the second group of channel segments includes axial channel segments that traverse the core structure at an outer circumference of the core structure that is clear from poles of the core structure.
18. The electric motor (EM) system with integrated heat exchanger of claim 17 , wherein:
the axial channel segments are radially aligned with the poles of the core structure.
19. The electric motor (EM) system with integrated heat exchanger of claim 17 , wherein:
two flanked channel segments of the axial channel segments are joined through a channel segment that is embedded in a bridging structure, the bridging structure in contact with a first surface of the core structure.
20. The electric motor (EM) system with integrated heat exchanger of claim 19 , wherein:
the two flanked channel segments are joined to the first group of channel segments through a second surface of the core structure.
21. The electric motor (EM) system with integrated heat exchanger of claim 20 , wherein:
the first group of channel segments include channel segments that extend to the radial locations of the two flanked channel segments through one of:
a base plate of the housing, or
a ledge structure of the housing.
22. The electric motor (EM) system with integrated heat exchanger of claim 15 , wherein:
the combined continuous channel comprises a path that alternates between an inner circumference of the housing and an outer circumference of the housing.
23. The electric motor (EM) system with integrated heat exchanger of claim 22 , wherein:
alternations between the inner circumference of the housing and the outer circumference of the housing are according to a periodic pattern.
24. The electric motor (EM) system with integrated heat exchanger of claim 22 , wherein:
the surface area increasing features comprise any one or more of: a flat fin-shaped structure; a loop-shaped structure; an arch-shaped structure; or a combination thereof.
25. The electric motor (EM) system with integrated heat exchanger of claim 15 , further comprising:
a cavity structure coupled to a region of the housing that includes protrusions of the surface area increasing features, the cavity structure configured to contain a flowing fluid coolant in contact with the protrusions.