US 12,407,203 B2
Electric motor having a rotor with a burst-protection sleeve without an adhesion of the magnet elements
Julian Botiov, Bühl (DE); Markus Dietrich, Oberkirch (DE); and Christian Brunner, Rheinstetten (DE)
Assigned to Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
Appl. No. 17/791,212
Filed by Schaeffler Technologies AG & Co. KG, Herzogenaurach (DE)
PCT Filed Oct. 21, 2020, PCT No. PCT/DE2020/100906
§ 371(c)(1), (2) Date Jul. 7, 2022,
PCT Pub. No. WO2021/139848, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 10 2020 100 306.4 (DE), filed on Jan. 9, 2020.
Prior Publication US 2023/0065959 A1, Mar. 2, 2023
Int. Cl. H02K 1/2781 (2022.01); H02K 1/28 (2006.01); H02K 21/14 (2006.01)
CPC H02K 1/2781 (2022.01) [H02K 1/28 (2013.01); H02K 21/14 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An electric motor comprising:
a stator; and
a rotor rotatably mounted about a rotational axis relative to the stator, wherein the rotor has a main part, multiple magnet elements which are distributed along a circumferential direction and are received on a radial face of the main part in a mutually spaced manner, and a burst-protection sleeve which covers the main part and the magnet elements and wherein the burst-protection sleeve has multiple cover segments, each of which directly contacts a magnet element, and multiple bridging regions which connect two adjacent cover segments together, wherein the burst-protection sleeve is configured to directly support the magnet elements relative to the main part, wherein the bridging regions have a lower degree of flexural strength in the circumferential direction than the cover segments, wherein at a second axial end of the burst-protection sleeve each cover segment has an extension projecting in an axial direction, wherein the extension has a tapered end, wherein each bridging region is provided with a rising flank towards the second axial end of the burst-protection sleeve, wherein the rising flank is axially offset from the extension and extends radially up to the cover segments at an axial position at which the extension projects in the axial direction from the cover segments.