{
  "$type": "site.standard.document",
  "description": "Electrical systems 201 for connecting rotary electric machines 111, 113 with gas turbine spools are provided. One such electrical system 201 comprises: a first rotary electric machine 111 mechanically coupled with a first gas turbine spool and a second rotary electric machine 113 mechanically…",
  "path": "/patents/1425499",
  "publishedAt": "2024-04-17T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B64D27/02",
    "ROLLS ROYCE PLC [GB]"
  ],
  "textContent": "Electrical systems 201 for connecting rotary electric machines 111, 113 with gas turbine spools are provided. One such electrical system 201 comprises: a first rotary electric machine 111 mechanically coupled with a first gas turbine spool and a second rotary electric machine 113 mechanically coupled with a second gas turbine spool, each said electric machine 111, 113 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 203 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 111; a second set 204 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 113; and a number 1 ≤ R ≤ N / 2 of dc outputs for connection with an R-channel electrical network 206. 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 203 and second set 204, for which n (mod R) ≡ r is satisfied.",
  "title": "ELECTRICAL SYSTEMS"
}