US 11,923,750 B2
Three-phase stator assembly
Steen Mikkelsen, Bjerringbro (DK); and Keld Folsach Rasmussen, Ans (DK)
Assigned to GRUNDFOS HOLDING A/S, Bjerringbro (DK)
Filed by GRUNDFOS HOLDING A/S, Bjerringbro (DK)
Filed on Dec. 15, 2021, as Appl. No. 17/551,540.
Claims priority of application No. 20215323 (EP), filed on Dec. 18, 2020.
Prior Publication US 2022/0200397 A1, Jun. 23, 2022
Int. Cl. H02K 1/14 (2006.01); H02K 3/28 (2006.01); H02K 3/52 (2006.01); H02K 5/22 (2006.01)
CPC H02K 5/225 (2013.01) [H02K 1/148 (2013.01); H02K 3/28 (2013.01); H02K 3/522 (2013.01); H02K 2203/06 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A three-phase stator assembly of an electric pump drive motor, the stator assembly comprising:
three sets of stator segments, wherein the stator segments are configured as a ring arrangement about an axially extending stator axis, wherein each set of stator segments comprises n≥2 stator segments with an n-fold rotational symmetry about the stator axis, wherein each stator segment comprises coil-forming elements on which a coil wire is wound, wherein the coil wire has a first coil wire end at a radial inner side of the stator segment and a second coil wire end at a radial outer side of the stator segment;
a wire guide element being mounted to an axial front side of the stator segments that have the coil wire wound on their coil-forming elements;
a star point wire being guided by the wire guide element and connecting the first coil wire ends of the coil wires of the (j=n)th stator segments of the three sets of stator segments with each other; and
a plurality of 3n−3 connection wires that are arranged at the axial front side of the stator segments, wherein the connection wires, guided by the wire guide element, are not crossing each other, wherein each connection wire connects two coil wires of a respective set of stator segments in series, wherein a first interposed stator segment and a second interposed stator segment of two other sets of the stator segments are arranged in circumferential direction between the two connected coil wires of said respective set of stator segments,
wherein at least 3n−5 of the connection wires span across the first interposed stator segment at a first radial distance to the stator axis and across the second interposed stator segment at a second radial distance to the stator axis, wherein the second radial distance is larger than the first radial distance,
wherein each stator segment further comprises a first insulation displacement terminal for connecting the respective connection wire with the first coil wire end and a second insulation displacement terminal for connecting the respective connection wire with the second coil wire end.