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1. (WO2017153061) ELECTRIC MACHINE HAVING HIGH ROTATIONAL-SPEED RESISTANCE

Pub. No.:    WO/2017/153061    International Application No.:    PCT/EP2017/050147
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Thu Jan 05 00:59:59 CET 2017
IPC: H02K 1/27
H02K 1/28
H02K 15/03
H02K 7/00
Applicants: ROBERT BOSCH GMBH
Inventors: PLOEGER, Armin
HANNACH, Taoufiq
SCHUERG, Stefan
GRAHLMANN, Ivo
BRAEUNIG, Anton
KOL, Murat
Title: ELECTRIC MACHINE HAVING HIGH ROTATIONAL-SPEED RESISTANCE
Abstract:
The invention relates to a rotor (14) for an electric machine, wherein the rotor (14) has high rotational-speed resistance. The rotor (14) has at least one laminated core (16) having metal sheet laminations stacked one over the other in the direction of longitudinal extent of the rotor (14), wherein a plurality of magnet-holding channels (20) is provided near an outer circumference of the laminated core (16), which magnet-holding channels extend in the longitudinal direction of the rotor (14) and are spaced apart from each other in the circumferential direction (25) of the rotor (14) and in each of which magnet-holding channels at least one magnet element (22) is arranged. The rotor (14) is characterized in that two adjacent magnet-holding channels (20) are connected to each other by means of a connecting channel (40) in such a way that an outer region (30) of the laminated core (16) has, on the side of said outer region directed radially inward, a protruding bulge (42) bounded by the connecting channel (40), which bulge has a smaller width in the circumferential direction (25) in a region (44) radially further outside than in a region (46) radially further inside. Because of the special geometric design of the connecting channel (40), plastic material accommodated in the connecting channel (40) is loaded mainly in compression instead of in tension and therefore can withstand higher loads, the outer region (30) therefore being retained in the inner region (32) of the laminated core (16) in the manner of a tension anchor.