Systems for eccentric annular cover for stator end windings

1 . A system comprising:

a motor including:

a rotor;

a stator disposed around the rotor, wherein the stator includes a stator core and one or more windings, wherein the one or more windings include one or more end windings extending from a longitudinal end of the stator core; and

a cover for the one or more end windings and disposed around the rotor, wherein the cover is configured to transfer a cooling fluid to cool the one or more end windings, and wherein the cover includes:

a body to cover the one or more end windings, the body including a cavity for the cooling fluid;

an inlet disposed in the body for the cooling fluid to enter the cavity; and

an outlet disposed in the body for the cooling fluid to exit the cavity, wherein the outlet is disposed at a portion of the body opposite to the inlet,

wherein a first radial width of the cavity at the inlet is greater than a second radial width of the cavity at the outlet.

2 . The system of claim 1 , wherein a radial width of the cavity is variable from the first radial width to the second radial width based on an angular position in the cavity.

3 . The system of claim 1 , wherein the cover is connected to the stator core.

4 . The system of claim 1 , wherein the first radial width of the cavity includes a first gap between an inner surface of the cavity at the inlet and the one or more end windings and a second gap between the one or more end windings and an inner surface of a central opening of the cover at the inlet.

5 . The system of claim 4 , wherein the second radial width includes a third gap between the inner surface of the cavity at the outlet and the one or more end windings and a fourth gap between the one or more end windings and an inner surface of the central opening of the cover at the outlet.

6 . The system of claim 5 , wherein the first gap and the second gap are configured to transfer cooling fluid.

7 . The system of claim 4 , wherein the first gap is from approximately one millimeter to approximately ten millimeters.

8 . The system of claim 1 , wherein the first radial width and the second radial width include an eccentricity value.

9 . The system of claim 8 , wherein the eccentricity value is greater than zero millimeters and less than five millimeters.

10 . The system of claim 1 , wherein a cooling fluid pressure drop in the cover is substantially constant.

11 . The system of claim 1 , further including:

an inverter to convert DC power from a battery to AC power to drive the motor; and

the battery configured to supply the DC power to the inverter,

wherein the system is provided as a vehicle including the inverter, the battery, and the motor.

12 . A system comprising:

a stator including:

a stator core;

one or more windings, wherein the one or more windings include one or more end windings extending from a longitudinal end of the stator core; and

a cover for the one or more end windings and to be disposed around a rotor, wherein the cover is configured to transfer a cooling fluid to cool the one or more end windings, and wherein the cover includes:

a body to cover the one or more end windings, the body including a cavity for the cooling fluid;

an inlet disposed in the body for the cooling fluid to enter the cavity; and

an outlet disposed in the body for the cooling fluid to exit the cavity, wherein the outlet is disposed at a portion of the body opposite to the inlet,

wherein a first radial width of the cavity at the inlet is greater than a second radial width of the cavity at the outlet.

13 . The system of claim 12 , wherein the cover is connected to the stator core.

14 . The system of claim 12 , wherein the first radial width of the cavity includes a first gap between an inner surface of the cavity at the inlet and the one or more end windings and a second gap between the one or more end windings and an inner surface of a central opening of the cover at the inlet.

15 . The system of claim 14 , wherein the first gap is from approximately one millimeter to approximately ten millimeters.

16 . A system comprising:

a cover including:

a body to be disposed around a rotor and to cover one or more end windings extending from a longitudinal end of a stator core, the body including a cavity for a cooling fluid;

an inlet disposed in the body for the cooling fluid to enter the cavity; and

an outlet disposed in the body for the cooling fluid to exit the cavity, wherein the outlet is disposed at a portion of the body opposite to the inlet,

wherein a first radial width of the cavity at the inlet is greater than a second radial width of the cavity at the outlet.

17 . The system of claim 16 , wherein a radial width of the cavity is variable from the first radial width to the second radial width based on an angular position in the cavity.

18 . The system of claim 16 , wherein the first radial width of the cavity includes a first gap between an inner surface of the cavity at the inlet and the one or more end windings and a second gap between the one or more end windings and an inner surface of a central opening of the cover at the inlet, wherein the first gap is from approximately one millimeter to approximately ten millimeters.

19 . The system of claim 18 , wherein the second radial width of the cavity includes a third gap between the inner surface of the cavity at the outlet and the one or more end windings and a fourth gap between the one or more end windings and an inner surface of the central opening of the cover at the outlet.

20 . The system of claim 18 , wherein the first gap is from approximately one millimeter to approximately ten millimeters.