US 12,334,778 B2
Rotor for a permanently energized electrical machine, with a support structure
Norman Borchardt, Oberschleissheim (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Appl. No. 17/418,902
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
PCT Filed Feb. 5, 2020, PCT No. PCT/EP2020/052797
§ 371(c)(1), (2) Date Jun. 28, 2021,
PCT Pub. No. WO2020/177964, PCT Pub. Date Sep. 10, 2020.
Claims priority of application No. 10 2019 105 570.9 (DE), filed on Mar. 5, 2019.
Prior Publication US 2022/0123612 A1, Apr. 21, 2022
Int. Cl. H02K 1/274 (2022.01); H02K 1/02 (2006.01); H02K 1/27 (2022.01); H02K 1/276 (2022.01); H02K 21/14 (2006.01)
CPC H02K 1/2773 (2013.01) [H02K 1/02 (2013.01); H02K 2201/03 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A rotor for a permanently energized electrical machine, the rotor comprising:
at least two rotor poles arranged next to one another in a circumferential direction;
a rotor iron core;
a permanent magnet assembly embedded in the rotor iron core for producing a magnetic air gap flux density in an air gap of the electrical machine which adjoins an outer side of the rotor iron core, wherein the permanent magnet assembly has at least one permanent magnet per rotor pole, and each permanent magnet is divided into two permanent magnet parts; and
a crosspiece between the two permanent magnet parts, wherein the crosspiece:
separates two hollow spaces for receiving the permanent magnet parts,
has magnetically conductive support sections for increasing mechanical stiffness of the rotor iron core and for discharging external magnetic fluxes in an event of an active short-circuit introduced into the electrical machine, and
has magnetically insulating flux-blocking sections for reducing magnetic leakage fluxes,
wherein adjacent sides of the two permanent magnetic parts that face each other are oriented parallel to each other,
wherein each of the two permanent magnetic parts includes a surface that is perpendicular to a radial direction, and
wherein the flux-blocking sections are arranged at a distance from one another in the radial direction, so that the flux-blocking sections and the support sections are arranged alternately in the radial direction in the crosspiece.