US 12,407,202 B2
Rotor of an electric machine having a multi-layered permanent magnet arrangement
Peter Theisinger, Markgroeningen (DE)
Assigned to Robert Bosch GmbH, Stuttgart (DE)
Appl. No. 18/251,473
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Oct. 25, 2021, PCT No. PCT/EP2021/079484
§ 371(c)(1), (2) Date May 2, 2023,
PCT Pub. No. WO2022/096300, PCT Pub. Date May 12, 2022.
Claims priority of application No. 10 2020 214 035.9 (DE), filed on Nov. 9, 2020.
Prior Publication US 2023/0412020 A1, Dec. 21, 2023
Int. Cl. H02K 1/27 (2022.01); H02K 1/276 (2022.01); H02K 29/03 (2006.01)
CPC H02K 1/276 (2013.01) [H02K 29/03 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A rotor (1) of an electric machine (10), comprising a rotor body (2) which can be rotated about a rotor axis (100), has an outer circumference (8) and a plurality of rotor poles (5) and is formed by a stack of laminations, each rotor pole (5) having a central pole axis (101) and an arrangement of permanent magnets (4) arranged in pockets (6, 7) of the rotor body (2), the arrangement of permanent magnets (4) comprising two radially spaced layers (3i, 3a) having permanent magnets (4), a radially inner layer (3i) having two inner pockets (6) arranged symmetrically with respect to the central pole axis (101) and an inner connecting portion (9i) between the two inner pockets (6), and a radially outer layer (3a) having an outer pocket (7) arranged symmetrically with respect to the central pole axis (101),
wherein
the inner connecting portion (9i) is a single connecting portion arranged symmetrically with respect to the central pole axis (101),
two additional pockets (12) which act as a flow barrier and are arranged symmetrically with respect to the central pole axis (101) are provided between the outer circumference (8) of the rotor body (2) and the outer pocket (7),
each additional pocket (12) forms a first outer connecting portion (9a) between the additional pocket (12) and the outer pocket (7), and
each of the two inner pockets (6) arranged symmetrically with respect to the central pole axis (101) contain a radially inner permanent magnet and a radially outer permanent magnet,
wherein the radially outer permanent magnets in each of the inner pockets are arranged to form an acute opening angle αi1 and the radially inner permanent magnets in each of the inner pockets are arranged to form an acute opening angle αi2, and
wherein the two first outer connecting portions (9a) of the radially outer layer (3a) enclose an acute connecting-portion angle βsa and the acute opening angles αi1, αi2 are greater than the acute connecting-portion angle βsa between the first outer connecting portions (9a).