US 2024/0195238 A1Published application

Cooling arrangement for cooling a stator for an electric motor

AssigneeZF Friedrichshafen AG

InventorsMartin Christians, Rayk Gersten, Marcel Schmitt, Wolfgang Hübler

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Abstract

The invention relates to a cooling arrangement (1, 1a) for cooling a stator (2) of an electric machine having a housing (10) and a stator (2), which is arranged fixed about a rotation axis in the housing (10), where the rotation axis defines an axial direction and a radial direction radially relative to the rotation axis. At the respective axial ends of the stator (2) a first cooling fluid ring (8, 8a) is mounted to form a first ring-shaped annular space with the housing (10) and a second cooling fluid ring (9) is mounted to form a second ring-shaped annular space, each of them designed to convey cooling fluid.

Claims16

Dependent claims

A cooling arrangement (1, 1a) for cooling a stator (2) of an electric machine, comprising:

a housing (10);
and
a stator (2) arranged fixed around a rotation axis in the housing (10), wherein the rotation axis (Rot) defines an axial direction and, radially relative to the rotation axis (Rot), a radial direction;
a first cooling fluid ring (8, 8a) is mounted on a first axial end of the stator to form a first annular space with the housing (10), the first cooling fluid ring configured to convey cooling fluid;
and
a second cooling fluid ring (9) mounted on a second axial end of the stator to form a second annular space with the housing, the second cooling fluid ring configured to convey cooling fluid;
wherein:
the first cooling fluid ring (8, 8a) defines on stator side a first annular groove (11) with a first diameter, which with the housing (10) forms a first annular chamber (12);
the first annular chamber (12) defines at least one cooling fluid inlet to let in a cooling fluid;
the first annular chamber (12) is sealed on the stator side by a first all-round seal;
the first annular chamber (12) has outlets (26) to let out the cooling fluid in the stator (2);
the cooling fluid can be deflected at least partially in the stator (2) as a backwash fluid;
the first cooling fluid ring (8, 8a) defines at least one second annular groove (16) with a second diameter smaller than the first diameter and which forms with the housing (10) at least one second annular chamber (24);
the second annular groove (16) is arranged facing away from the stator and axially adjacent to the first annular groove (11);
the second annular chamber (24) has axial inlets (15) in the direction of the stator (2);
the first cooling ring defines axial perforations (18) extending in the axial direction and positioned radially inside of the first annular chamber (12), the axial perforations opening in the axial direction into the axial inlets (15) of the second annular chamber (24) to let in the deflected backwash fluid into the second annular chamber (24);
and
a third all-round seal is arranged on the housing (10) between the first annular chamber (12) and the second annular chamber (24), the third all-around seal configured for sealing the first annular chamber (12) relative to the second annular chamber (24).

15 more elements

Dependencies are inferred from the claim text.

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Abstract

A cooling arrangement (1, 1a) for cooling a stator (2) of an electric machine, comprising:

a housing (10);
and
a stator (2) arranged fixed around a rotation axis in the housing (10), wherein the rotation axis (Rot) defines an axial direction and, radially relative to the rotation axis (Rot), a radial direction;
a first cooling fluid ring (8, 8a) is mounted on a first axial end of the stator to form a first annular space with the housing (10), the first cooling fluid ring configured to convey cooling fluid;
and
a second cooling fluid ring (9) mounted on a second axial end of the stator to form a second annular space with the housing, the second cooling fluid ring configured to convey cooling fluid;
wherein:
the first cooling fluid ring (8, 8a) defines on stator side a first annular groove (11) with a first diameter, which with the housing (10) forms a first annular chamber (12);
the first annular chamber (12) defines at least one cooling fluid inlet to let in a cooling fluid;
the first annular chamber (12) is sealed on the stator side by a first all-round seal;
the first annular chamber (12) has outlets (26) to let out the cooling fluid in the stator (2);
the cooling fluid can be deflected at least partially in the stator (2) as a backwash fluid;
the first cooling fluid ring (8, 8a) defines at least one second annular groove (16) with a second diameter smaller than the first diameter and which forms with the housing (10) at least one second annular chamber (24);
the second annular groove (16) is arranged facing away from the stator and axially adjacent to the first annular groove (11);
the second annular chamber (24) has axial inlets (15) in the direction of the stator (2);
the first cooling ring defines axial perforations (18) extending in the axial direction and positioned radially inside of the first annular chamber (12), the axial perforations opening in the axial direction into the axial inlets (15) of the second annular chamber (24) to let in the deflected backwash fluid into the second annular chamber (24);
and
a third all-round seal is arranged on the housing (10) between the first annular chamber (12) and the second annular chamber (24), the third all-around seal configured for sealing the first annular chamber (12) relative to the second annular chamber (24).

15 more elements