Cooling assembly for cooling a rotating machine
AssigneeDana Belgium N.V.
InventorSteven VANHEE
Life of this patent
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Abstract
A cooling jacket surrounding the stator of an electric machine, having an inlet and a plurality of outlets disposed at ends of the cooling jacket, distributed in circumferential direction and configured to create liquid jets exiting the cooling jacket in a radial direction towards end windings at the axial ends of the machine. Coolant liquid flow guiding elements within the cooling jacket are configured so as to create a circumferentially homogeneous or more homogenous axial liquid flow towards the liquid outlets and/or towards the liquid jet devices.
Claims20
A cooling assembly for cooling an electric machine having a rotational axis, a first axial end, a second axial end, and end windings at the first and second axial ends, wherein the cooling assembly comprises:
- a cooling jacket surrounding the machine in circumferential direction for receiving and guiding a cooling liquid, wherein the cooling jacket comprises at least one liquid inlet and a plurality of liquid outlets, the liquid outlets being disposed at at least one axial end of the cooling jacket, distributed in circumferential direction, and spaced apart from the liquid inlet in circumferential direction, the liquid outlets being configured to create one or more liquid jets exiting the cooling jacket at the liquid outlets,
- one or more liquid jet devices for application of the liquid jets in a radial direction towards an axial end of the machine, and
- liquid flow guiding elements for guiding a liquid inside the cooling jacket between the at least one liquid inlet and the liquid outlets, wherein the liquid flow guiding elements are configured to generate an axial liquid flow in an axial direction towards at least one liquid jet device at one or both axial ends of the machine, and
- wherein each of the liquid jet devices comprises one or more flow reflector elements reflecting an axial liquid flow from the cooling jacket into a radial direction towards the axial end of the machine.
An electric machine comprising:
- a stator about a rotational axis of the machine;
- end windings at axial ends of the stator;
- and
- a cooling jacket surrounding the stator in a circumferential direction for receiving and guiding a cooling liquid,
- wherein the cooling jacket comprises at least one liquid inlet and a plurality of liquid outlets, the liquid outlets being disposed at at least one axial end of the cooling jacket, distributed in circumferential direction, and spaced apart from the liquid inlet in circumferential direction, the liquid outlets being configured to create one or more liquid jets exiting the cooling jacket at the liquid outlets,
- one or more liquid jet devices for application of the liquid jets in a radial direction towards an axial end of the machine, and
- liquid flow guiding elements for guiding a liquid inside the cooling jacket between the at least one liquid inlet and the liquid outlets, wherein the liquid flow guiding elements are configured to generate an axial liquid flow in an axial direction towards at least one liquid jet device at one or both axial ends of the machine, and wherein each of the liquid jet devices comprises one or more flow reflector elements reflecting an axial liquid flow from the cooling jacket into a radial direction towards the axial end of the machine.
Dependencies are inferred from the claim text.