公开(公告)号：US20240313622A1

公开(公告)日：2024-09-19

申请号：US18589701

申请日：2024-02-28

Applicant: ROLLS-ROYCE PLC

Inventor： Seamus D. GARVEY ,  Karuna KALITA

IPC: H02K11/30 ,  F02C6/20 ,  F02C7/268 ,  H02K1/14 ,  H02K7/18

CPC classification number: H02K11/30 ,  F02C6/20 ,  F02C7/268 ,  H02K1/146 ,  H02K7/1823

Abstract: An electric machine includes a stator having a phase arrangement, and a rotor. The phase arrangement includes first and second legs connected in parallel at first and second primary junctions. The legs each include first and second coils connected in series through a first intermediate junction. The intermediate junctions are connected by a branch such that the phase arrangement is a bridge circuit. The phase arrangement permits an alignment current to flow between the primary junctions via the branch, the alignment current being conducted through an alignment current path passing through one coil of each leg. The phase arrangement includes a negative impedance converter to add a negative electrical impedance to the alignment current path by introducing additional electrical energy into the respective alignment current path. The alignment current causes a translational force to be applied to the rotor for maintaining alignment of the rotor with respect to the stator.