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An electric machine with fluid cooling. The electric machine includes a stator, the stator having a stator winding and a stator core having a plurality of stacked magnetic laminations, each of the laminations of the stator core having a plurality of apertures overlapping to form a plurality of stato

An electric machine with fluid cooling. The electric machine includes a stator, the stator having a stator winding and a stator core having a plurality of stacked magnetic laminations, each of the laminations of the stator core having a plurality of apertures overlapping to form a plurality of stator fluid channels, a stator fluid channel of the plurality of stator fluid channels being not entirely axial. The electric machine further includes a rotor, the rotor having a shaft and a rotor core having a plurality of stacked magnetic laminations, each of the laminations of the rotor core having a plurality of apertures overlapping to form a plurality of rotor fluid channels, and a rotary fluid coupling in fluid communication with the rotor fluid channels. The rotor and the stator are configured to form a magnetic circuit comprising an air gap between the rotor and the stator.

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1. An electric machine, comprising: a stator;a rotor; anda rotary fluid coupling,the rotor having an axis of rotation and comprising: a shaft aligned with the axis of rotation; anda rotor body,the rotor body comprising a rotor core having a plurality of stacked magnetic laminations having a pluralit

1. An electric machine, comprising: a stator;a rotor; anda rotary fluid coupling,the rotor having an axis of rotation and comprising: a shaft aligned with the axis of rotation; anda rotor body,the rotor body comprising a rotor core having a plurality of stacked magnetic laminations having a plurality of apertures overlapping to form a plurality of rotor fluid channels configured to carry a liquid from a first end portion of the rotor body to a second end portion of the rotor body,the rotary fluid coupling being in fluid communication with the rotor fluid channels,a first aperture of the plurality of apertures being partially aligned with an aperture of an adjacent lamination to define a portion of a first, substantially axial, fluid passage,a second aperture of the plurality of apertures being partially aligned with an aperture of an adjacent lamination to define a portion of a second, substantially axial, fluid passage,wherein a third fluid passage connects the first fluid passage and the second fluid passage, the third fluid passage not being parallel to the first fluid passage and the third fluid passage not being parallel to the second fluid passage,wherein the first aperture defines a fluid entrance at the first end portion of the rotor body,wherein the second aperture defines a fluid exit at the second end portion of the rotor body,wherein the second fluid passage is blocked at the first end portion of the rotor body, and/or the first fluid passage is blocked at the second end portion of the rotor body, such that a fluid path is established from the first fluid passage to the second fluid passage through the third fluid passage,the machine having an air space including an air gap between the rotor and the stator, the rotor being configured to prevent escape of liquid from the rotor into the air space. 2. The machine of claim 1, wherein the shaft has a fluid passage in fluid communication with the rotor fluid channels. 3. The machine of claim 1, wherein the stator has a stator winding and a stator core having a plurality of stacked magnetic laminations having a plurality of apertures overlapping to form a plurality of stator fluid channels, a stator fluid channel of the plurality of stator fluid channels being not entirely axial, and wherein the rotor and the stator are configured to form a magnetic circuit comprising the air gap. 4. The machine of claim 3, further comprising at least one of: a stator manifold, the stator manifold having a stator manifold fluid channel in fluid communication with the stator fluid channels, anda rotor manifold, the rotor manifold having a rotor manifold fluid channel in fluid communication with the rotor fluid channels. 5. The machine of claim 3, wherein: a lamination of the stator core comprises a third aperture and a fourth aperture, the third aperture differing in shape and/or in size from the fourth aperture, and/ora lamination of the rotor core comprises a third aperture and a fourth aperture, the third aperture differing in shape and/or in size from the fourth aperture. 6. The machine of claim 3, wherein at least one of the stator core and the rotor core comprises: a first lamination having a first axial orientation and a plurality of substantially identical apertures; anda second lamination having a second axial orientation and a plurality of substantially identical apertures,wherein one of the apertures of the first lamination differs in shape and/or size from one of the apertures of the second lamination, and/or the first axial orientation differs from the second axial orientation. 7. The machine of claim 3, wherein each of the stator core and the rotor core comprises: a first lamination having a first axial orientation and a plurality of substantially identical third apertures; anda second lamination having a second axial orientation and a plurality of substantially identical fourth apertures,wherein one of the third apertures differs in shape and/or size from one of the fourth apertures, and/or the first axial orientation differs from the second axial orientation. 8. The machine of claim 3, wherein at least one of the stator core and the rotor core comprises: a first lamination having an aperture; anda second lamination adjacent to the first lamination, the second lamination having an aperture differing in size and/or shape from the aperture of the first lamination. 9. The machine of claim 3, wherein at least one of the stator core and the rotor core comprises: a first lamination; anda second lamination adjacent to, substantially identical to, and having substantially the same axial orientation as, the first lamination. 10. The machine of claim 3, wherein: a first lamination of the laminations of the stator is substantially identical to a second lamination of the laminations of the stator, and/ora first lamination of the laminations of the rotor is substantially identical to a second lamination of the laminations of the rotor. 11. The machine of claim 3, further comprising a flow director secured to the stator core and/or a flow director secured to the rotor core. 12. The machine of claim 3, further comprising at least one of: a flow director having a protrusion extending into an aperture of a lamination of the stator anda flow director having a protrusion extending into an aperture of a lamination of the rotor. 13. The machine of claim 3, wherein: the stator core comprises a first lamination at one end of the stator core and a second lamination, the first lamination having at least one aperture and the second lamination having at least one aperture not overlapping any aperture of the first lamination, and/orthe rotor core comprises a first lamination at one end of the rotor core and a second lamination, the first lamination having at least one aperture and the second lamination having at least one aperture not overlapping any aperture of the first lamination. 14. The machine of claim 3, wherein at least one of the stator core and the rotor core comprises: a first lamination, having at least one aperture, at a first end of the core; anda second lamination, having at least one aperture, at an end of the core opposite the first end,the second lamination having an aperture not overlapping any aperture of the first lamination, andthe first lamination having an aperture not overlapping any aperture of the second lamination. 15. The machine of claim 3, further comprising a stator manifold, the stator manifold having a stator manifold fluid channel in fluid communication with the stator fluid channels, wherein the stator core comprises an electrically insulating resin having a thermal conductivity greater than about 0.4 W/m/° C., the resin filling, with a void fraction less than about 10%: a space between the stator core and the stator winding, and/ora space between the stator manifold and an end turn of the stator winding, and/ora space within the stator winding. 16. The machine of claim 3, further comprising a stator manifold, the stator manifold having a stator manifold fluid channel in fluid communication with the stator fluid channels, wherein the stator manifold fluid channel is in fluid communication with the rotary fluid coupling. 17. The machine of claim 3, further comprising a stator manifold, the stator manifold having a stator manifold fluid channel in fluid communication with the stator fluid channels, wherein the stator manifold fluid channel comprises a plurality of stacked stator manifold cooler laminations, andwherein each of the stator manifold cooler laminations has a plurality of stator cooler apertures, the stator cooler apertures overlapping to form a plurality of stator manifold cooler fluid channels. 18. The machine of claim 17, wherein a stator manifold cooler fluid channel of the plurality of stator manifold cooler fluid channels is not entirely axial. 19. The machine of claim 1, further comprising: a rotor manifold, the rotor manifold having a rotor manifold fluid channel in fluid communication with the rotor fluid channels,wherein the rotor further comprises a rotor cage having a plurality of axial bars and two end rings, andwherein the rotor manifold has a protrusion which is embedded within an end ring of the two end rings. 20. The machine of claim 19, wherein the rotor manifold has a protrusion, a recess, or a hole, configured to secure balancing material. 21. The machine of claim 1, further comprising: a bearing configured to support an end of the shaft; andan end bell configured to support the bearing,wherein the bearing does not form a part of an electrically conductive path between the shaft and the end bell. 22. The machine of claim 3, wherein an external surface of the stator core and/or an external surface of the rotor core is sealed with a resin. 23. The machine of claim 3, further comprising an enclosure enclosing the stator core, the enclosure being configured to prevent leakage of fluid from the machine. 24. The machine of claim 3, further comprising a fluid in the stator fluid channels and in the rotor fluid channels, the fluid being selected from the group consisting of: automatic transmission fluids, transformer oils, and water-based solutions. 25. The machine of claim 1, further comprising a scavenge pump configured to return leaked fluid to a main fluid circuit. 26. The machine of claim 1, wherein the third fluid passage is perpendicular to the axis of rotation. 27. The machine of claim 1, wherein each of the first substantially axial fluid passage and the second substantially axial fluid passage has a length greater than one half a length of the rotor core. 28. An electric machine, comprising: a rotor; anda rotary fluid coupling,the rotor having: an axis of rotation;a shaft aligned with the axis of rotation; anda rotor core,the rotor core having a plurality of stacked magnetic laminations having a plurality of apertures overlapping to form a plurality of rotor fluid channels configured to carry liquid, a rotor fluid channel of the plurality of rotor fluid channels being not entirely aligned with the axis of rotation,the rotary fluid coupling being in fluid communication with the rotor fluid channels, the rotor being configured to prevent escape of liquid from the rotor except through the rotary fluid coupling. 29. An electric machine, comprising: a stator;a rotor; anda rotary fluid coupling,the rotor having: an axis of rotation,a shaft aligned with the axis of rotation; anda rotor core,the rotor core having a plurality of stacked magnetic laminations having a plurality of apertures overlapping to form a plurality of rotor fluid channels configured to carry liquid, a rotor fluid channel of the plurality of rotor fluid channels being not entirely aligned with the axis of rotation,the rotary fluid coupling being in fluid communication with the rotor fluid channels,the machine having an air space including an air gap between the rotor and the stator, the rotor being configured to prevent escape of liquid from the rotor core directly into the air space. 30. The electric machine of claim 29, wherein the rotor is configured to prevent escape of liquid from the rotor into the air space. 31. The electric machine of claim 29, wherein: the rotor core consists of n laminations, n being a whole number, each of the laminations having a plurality of apertures, the apertures overlapping to form a first substantially axial fluid passage and a second substantially axial fluid passage, each of the first substantially axial fluid passage and the second substantially axial fluid passage having a length greater than one half a length of the rotor core; andthe rotor core has k transverse fluid passages, k being a whole number greater than n/6, each of the transverse fluid passages being perpendicular to the axis of rotation and connecting the first substantially axial fluid passage and the second substantially axial fluid passage. 32. An electric machine, comprising: a rotor;a first rotary fluid coupling; anda second rotary fluid coupling,the rotor having: an axis of rotation;a shaft aligned with the axis of rotation; anda rotor core,the rotor core having a plurality of stacked magnetic laminations having a plurality of apertures overlapping to form a plurality of rotor fluid channels configured to carry liquid, a rotor fluid channel of the plurality of rotor fluid channels being not entirely aligned with the axis of rotation,the first rotary fluid coupling being in fluid communication with the rotor fluid channels, andthe second rotary fluid coupling being in fluid communication with the rotor fluid channels. 33. The electric machine of claim 32, further comprising a stator, the machine having an air space including an air gap between the rotor and the stator, the rotor being configured to prevent escape of liquid from the rotor core directly into the air space. 34. The electric machine of claim 33, each fluid channel of the plurality of rotor fluid channels having a respective portion perpendicular to the axis of rotation and not parallel to the radial direction, the portion having an axial dimension of less than four lamination thicknesses. 35. The electric machine of claim 33, each fluid channel of the plurality of rotor fluid channels having a respective portion perpendicular to the axis of rotation and not parallel to the radial direction, the portion having an axial dimension of less than about 0.040 inches. 36. The electric machine of claim 32, wherein a first fluid path includes: a first substantially axial portion;a portion perpendicular to the axis of rotation and not parallel to the radial direction; anda second substantially axial portion,the first fluid path being a fluid path from the first rotary fluid coupling, through the rotor, to the second rotary fluid coupling.