US 12,352,213 B2
Electrical systems with dual-wound rotary electric machines
Graham P Bruce, Derby (GB); Stephen M Husband, Derby (GB); and David F Brookes, Derby (GB)
Assigned to ROLLS-ROYCE plc, London (GB)
Filed by ROLLS-ROYCE plc, London (GB)
Filed on Jan. 24, 2023, as Appl. No. 18/158,683.
Application 18/158,683 is a continuation of application No. 17/002,044, filed on Aug. 25, 2020, abandoned.
Claims priority of application No. 1913016 (GB), filed on Sep. 10, 2019.
Prior Publication US 2023/0160344 A1, May 25, 2023
Int. Cl. F01D 15/10 (2006.01); F02C 3/113 (2006.01); F02C 7/275 (2006.01); F02C 7/32 (2006.01); H02K 7/18 (2006.01)
CPC F02C 7/275 (2013.01) [F01D 15/10 (2013.01); F02C 3/113 (2013.01); F02C 7/32 (2013.01); H02K 7/1823 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An electrical system for connecting rotary electric machines with gas turbine spools, further comprising:
a first dual-wound rotary electric machine mechanically coupled with a first gas turbine spool and comprising a first three-phase sub-machine and a second three-phase submachine electrically independent from the first three-phase submachine;
a second dual-wound rotary electric machine mechanically coupled with a second gas turbine spool and comprising a third three-phase sub-machine and a fourth three-phase submachine electrically independent from the third three-phase submachine, the first dual-wound rotary electric machine being separately provided from the second dual-wound rotary electric machine; and
a set of N=4 bidirectional converter circuits for conversion of alternating current (ac) to and from direct current (dc), each of which has an associated index n=(1, . . . , N), and for all n, the ac side of the nth bidirectional converter circuit is connected with the nth three-phase sub-machine,
wherein the dc side of a first bidirectional converter circuit and the dc side of a third bidirectional converter circuit are connected with each other and to a first dc output bus via a first switch array,
wherein the dc side of a second bidirectional converter circuit and the dc side of a fourth bidirectional converter circuit are connected with each other and to a second dc output bus via a second switch array, and
wherein a fault in one of the first and second three-phase submachines cannot affect the other of the first and second three-phase submachines, and a fault in one of the third and fourth three-phase submachines cannot affect the other of the third and fourth three-phase submachines.