US 12,244,190 B2
Rotor with interconnectable coils units, electric drive machine and motor vehicle
Norman Borchardt, Luebeck (DE); and Robert Schmidt, Munich (DE)
Assigned to Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Filed by Bayerische Motoren Werke Aktiengesellschaft, Munich (DE)
Filed on Nov. 9, 2022, as Appl. No. 17/983,979.
Claims priority of application No. 10 2021 129 198.4 (DE), filed on Nov. 10, 2021.
Prior Publication US 2023/0147001 A1, May 11, 2023
Int. Cl. H02K 19/32 (2006.01); H02K 1/26 (2006.01); H02K 3/18 (2006.01); H02K 11/30 (2016.01)
CPC H02K 19/32 (2013.01) [H02K 1/265 (2013.01); H02K 3/18 (2013.01); H02K 11/30 (2016.01)] 17 Claims
OG exemplary drawing
 
1. A rotor for an electrically excited drive machine, comprising:
a coil per rotor pole with, in each case, one first energizable coil unit; and
a rotor core for holding the coils of the rotor poles, wherein
the coils have, in each case, at least one second energizable coil unit per rotor pole, and
the rotor has an interconnecting unit configured to interconnect the first and second coil units per coil in a manner which is dependent on an operating point of the electric drive machine in order to set the number of windings of the coil, and in order to electrically connect the coils of the rotor poles for configuring a rotor winding with an overall number of windings which is dependent on the numbers of windings of the coils,
wherein the coil units in each case have a feed line and a return line which are connected to the interconnecting unit, and of which, in a manner dependent on an interconnection state, provided by the interconnecting unit, of the coil units, one of the feed lines configures an input connector and one of the return lines configures an output connector of the respective coil,
wherein the interconnecting unit is configured to:
in order to interconnect the first and second coil units per coil, connect the feed line of the one coil unit of the coil to the return line of the other coil unit of the same coil, the respective other feed line configuring the input connector of the coil, and the respective other return line configuring the output connector of the coil; and
in order to interconnect the coils, electrically connect all apart from one output connector and all apart from one input connector to the rotor winding, the unconnected input connector and the unconnected output connector configuring an overall input connector and an overall output connector of the rotor winding.