公开(公告)号：US20210070463A1

公开(公告)日：2021-03-11

申请号：US17001990

申请日：2020-08-25

Applicant: ROLLS-ROYCE plc

Inventor： Stephen M. HUSBAND ,  Jeffrey HOBDAY ,  Graham P. BRUCE ,  David F. BROOKES

IPC: B64D35/02 ,  H02K7/18 ,  H02M7/04 ,  F02C7/36

Abstract: Electrical systems for connecting rotary electric machines with gas turbine spools are provided. One such electrical system comprises: a first rotary electric machine mechanically coupled with a first gas turbine spool and a second rotary electric machine mechanically coupled with a second gas turbine spool, each said electric machine having an identical even number N≥4 of phases, each phase having a respective index n=(1, . . . , N), and each phase comprising an identical number P≥1 of coils wound in a P-plex configuration in which adjacent phases are radially separated by 2π/NP mechanical radians; a first set of N bidirectional converter circuits for conversion of alternating current (ac) to and from direct current (dc), each converter circuit having a respective index n and being connected with the P coils in the nth phase of the first rotary electric machine; a second set of N bidirectional converter circuits for conversion of ac to and from dc, each converter circuit having a respective index n and being connected with the P coils in the nth phase of the second rotary electric machine; and a number 1≤R≤N/2 of dc outputs for connection with an R-channel electrical network. Each dc output has respective index r=(1, . . . , R); wherein for all r, the rth dc output is connected with the dc side of the nth converter circuits in both the first set and second set, for which n (mod R)≡r is satisfied.

公开(公告)号：US20220131435A1

公开(公告)日：2022-04-28

申请号：US17572242

申请日：2022-01-10

Applicant: ROLLS-ROYCE plc

Inventor： Stephen M. HUSBAND ,  Jeffrey HOBDAY

IPC: H02K3/28 ,  H02K3/42 ,  H02K7/18 ,  H02P25/22 ,  H02K21/48 ,  H02K21/16

Abstract: Fault-tolerant electric drive systems including a machine having a rotor and a stator having coils arranged in pairs. Each coil in each pair separated by 180 degrees, a first phase (ϕA) having one of the coil pairs and a phase drive circuit connected therewith, a second phase (ϕB) having a second one of the coil pairs and a second phase drive circuit connected therewith, a third phase (ϕC) having a third one of the coil pairs and a third phase drive circuit connected therewith, and a fourth phase having a fourth one of the coil pairs and a fourth phase drive circuit connected therewith. Further included is a controller connected with the first, second, third and fourth phase drive circuits to control operation thereof.

公开(公告)号：US20210075285A1

公开(公告)日：2021-03-11

申请号：US17007436

申请日：2020-08-31

Applicant: ROLLS-ROYCE plc

Inventor： Stephen M. HUSBAND ,  Jeffrey HOBDAY

IPC: H02K3/28 ,  H02K1/16 ,  H02K3/14 ,  H02K3/24 ,  H02K3/42 ,  H02K3/493 ,  H02K7/18 ,  H02K9/19 ,  H02K21/14 ,  B64D27/10 ,  B64D27/24 ,  F02C7/266

Abstract: Fault-tolerant four-phase electric drive systems are provided. One such system comprises: a rotary electric machine having a permanent magnet rotor and an alternate-wound stator having eight evenly-spaced coils arranged in pairs, each coil in each pair being separated by 180 degrees; a first phase (ΦA) comprising a first one of the coil pairs and a first phase drive circuit connected therewith; a second phase (ΦB) separated by +45 degrees from the first phase and comprising a second one of the coil pairs and a second phase drive circuit connected therewith; a third phase (ΦC) separated by +90 degrees from the first phase and comprising a third one of the coil pairs and a third phase drive circuit connected therewith; a fourth phase (ΦD) separated by +135 degrees from the first phase and comprising a fourth one of the coil pairs and a fourth phase drive circuit connected therewith; and a controller connected with the first, second, third and fourth phase drive circuits to control operation thereof.