US 12,308,699 B2
Electrical machine, stator extension element and wind turbine
Ziad Azar, Sheffield (GB); Richard Clark, Sheffield (GB); Thomas Tøttrup Jensen, Brande (DK); Subhra Samanta, Ikast (DK); and Arwyn Thomas, Breaston (GB)
Assigned to SIEMENS GAMESA RENEWABLE ENERGY A/S, Brande (DK)
Filed by Siemens Gamesa Renewable Energy A/S, Brande (DK)
Filed on May 3, 2022, as Appl. No. 17/735,174.
Claims priority of application No. 21172369 (EP), filed on May 6, 2021.
Prior Publication US 2022/0360123 A1, Nov. 10, 2022
Int. Cl. H02K 1/16 (2006.01); H02K 3/12 (2006.01); H02K 7/18 (2006.01)
CPC H02K 1/16 (2013.01) [H02K 3/12 (2013.01); H02K 7/183 (2013.01)] 16 Claims
OG exemplary drawing
 
1. An electrical machine comprising:
a stator with a stator core, a plurality of stator teeth protruding radially from the stator core, and a plurality of stator coils, wherein each stator coil is wound around at least one stator tooth of the stator, and comprises a first straight section arranged in a first slot and a second straight section arranged in a second slot, wherein a single stator tooth is disposed between the first slot and the second slot;
at least one coil head protruding in an axial direction beyond the stator core, the at least one coil head comprising a bent section that connects the first straight section and the second straight section; and
a stator extension structure with a plurality of magnetic flux-guiding extension segments each protruding axially from a stator tooth into an area defined between the bent section and the single stator tooth;
a rotor with at least one magnetic flux generation means, wherein the magnetic flux generation means overlaps the extension segments at least partly in an axial direction of the electric machine;
wherein each extension segment abuts the bent section of the at least one coil head in an axial direction and/or a circumferential direction.