Stator device for an electrical machine

Abstract

Stator device (1) for an electrical machine (1), comprising:- a stator core (2) with a longitudinal axis (3), a first axial end face (4) and a second axial end face (5), wherein the stator core (2) forms the following:(i) a plurality of slots (13) for receiving a stator winding (11), wherein the slots (13) are distributed around the longitudinal axis (3) and extend from the first to the second axial end face (4, 5), and(ii) a plurality of holes (14), wherein the holes (14) are distributed at a radial position further outward than the slots (13) around the longitudinal axis (3) and extend from the first to the second axial end face (4, 5);and- a cooling ring (6) having (i) a mounting surface (7) arranged on the first axial end face (4) at a radial position (R) between the slots (13) and the holes (14), and (ii) a separating portion (8) extending from the mounting surface (7) at least partially in the axial direction to separate the outside of the stator core into a radial outer space (10) for receiving a coolant and into a radial inner space (9); wherein at least some of the holes (14) are fixing holes (16), the cooling ring (6) comprising a number of at least two fixing portions (18), each extending from the separating portion (8) and engaging with one of the fixing holes (16);

Claims

[1] Stator device (1) for an electrical machine (1), the stator device (1) comprising: - a stator core (2) having a longitudinal axis (3), a first axial end face (4) and a second axial end face (5) opposite the first axial end face (4), the stator core (2) forming: (i) a plurality of slots (13) for receiving a stator winding (11), the slots (13) being distributed around the longitudinal axis (3) and extending from the first axial end face (4) to the second axial end face (5), and (ii) a plurality of holes (14), the holes (14) being distributed around the longitudinal axis (3) at a radial position further outward than the slots (13) and extending from the first axial end face (4) to the second axial end face (5); and - a cooling ring (6) with (i) a mounting surface (7) arranged on the first axial end face (4) at a radial position (R) between the slots (13) and the holes (14), and (ii) a separating portion (8) extending from the mounting surface (7) at least partially in the axial direction to separate the outside of the stator core (2) into a radial outer space (10) for receiving a coolant and a radial inner space (9); characterized by that at least some of the holes (14) are fixing holes (16), wherein the cooling ring (6) comprises a number of at least two fixing sections (18), each extending from the separating section (8) and engaging with one of the fixing holes (16). [2] Stator device according to claim 1, further comprising cooling channels (15) for the coolant, which are formed by at least some of the holes (14) or by grooves on the outer diameter of the stator core (2). [3] The stator device according to claim 1 or 2, wherein each fixing portion (18) is frictionally engaged with the fixing hole (16). [4] Stator device according to claim 3, wherein each fixing section (18) is designed as a Christmas tree connector. [5] Stator device according to claim 1 or 2, wherein each fixing portion (18) is engaged with the fixing hole (16) by a snap connection. [6] Stator device according to claim 5, wherein each fixing hole (16) comprises a projection (22) and the fixing portion (18) comprises a hook (23) which engages behind the projection (22). [7] Stator device according to claim 6, wherein the stator core (2) is formed by a plurality of axially stacked laminations (26a, 26b), wherein the first axial end face (4) is formed by a first of the laminations (26a), wherein the holes (14) are formed by a group (27) of axially successive laminations (26a, 26b) comprising the first lamination (26a), wherein the group (27) comprises through-holes (29a, 29b, 29c) forming the holes (14), and a first sub-group (28a) of at least one of the laminations (26a), which comprises the first lamination (26a), and a second sub-group (28b) of at least one, in particular several, of the laminations (26b), which follows the first sub-group (28a) in the axial direction, wherein the projections (22) are formed by a predetermined number of through-holes (29a) of a first type of the first subgroup (28a). [8] Stator device according to claim 7, wherein each through-hole (29a, 29b, 29c) has an edge (30), wherein, to form the projections (22), the edge (30) of the through-holes (29a) of the first type of the first sub-group (26a) at least partially overlaps the edge (30) of the through-holes (29b) of the second type of the second sub-group (28b). [9] Stator device according to one of claims 7 or 8, wherein the predetermined number of through holes (29a) of the first type corresponds to the number of the fixing portions (18), the fixing holes (16) being formed by rotating the first subgroup (28a) and the second subgroup (28b) relative to each other. [10] The stator device according to claim 9, wherein a predetermined number of a second type of the through holes (29b) is equal to or greater than the number of fixing sections (18), wherein the through holes (29b) of the second type for forming the projection (22) have a different shape than the through holes (29a) of the first type when the through holes (29a) of the first type in the first subsection (28a) overlap the through holes (29b) of the second type for forming the fixing holes (16), wherein the through holes (29a, 29b) of the first and second types are spaced apart in the circumferential direction by a first integer fraction of 360 degrees, wherein the first subgroup (28a) and the second subgroup (28b) are rotated relative to each other by a second integer fraction of 360 degrees. [11] Stator device according to claim 10, wherein - the through holes (29a) of the first type and the through holes (29b) of the second type are formed alternately along the circumferential direction or - the through holes (29a) of the first type and a pair of the through holes (29b) of the second type are formed alternately along the circumferential direction. [12] The stator device according to claim 10, wherein two through holes (29b) of the second type are formed adjacent to each other in the circumferential direction, and the further through holes (29a) of the first type and the through holes (29b) of the second type are formed alternately along the circumferential direction, wherein the fixing portions (18) are unevenly spaced in the circumferential direction. [13] Stator device according to one of claims 1 to 11, wherein the fixing elements (18) are evenly spaced in the circumferential direction. [14] Stator device according to one of claims 1 to 10 or claim 12, wherein the fixing portions (18) are unevenly spaced in the circumferential direction. [15] Stator device according to one of the preceding claims, further comprising that the stator winding (11) is arranged in the slots (13) and forms a winding head in the radial inner space (9), wherein the separating section (8) comprises a plurality of nozzles (18a) configured to spray the coolant from the radial outer space (10) into the radial inner space (9) onto the winding heads.

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