{
  "$type": "site.standard.document",
  "description": "Aircraft cabin blower systems 400 and methods of operating aircraft cabin blower systems are provided. One aircraft cabin blower system 400 comprises: a cabin blower compressor 402 having a contactless bearing arrangement 403; a transmission 410 having a transmission output arranged to drive the…",
  "path": "/patents/1410083",
  "publishedAt": "2022-11-16T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B64D13/02",
    "ROLLS ROYCE PLC [GB]"
  ],
  "textContent": "Aircraft cabin blower systems 400 and methods of operating aircraft cabin blower systems are provided. One aircraft cabin blower system 400 comprises: a cabin blower compressor 402 having a contactless bearing arrangement 403; a transmission 410 having a transmission output arranged to drive the cabin blower compressor 402, a first transmission input 414 arranged to receive mechanical power from a gas turbine engine 10, and a second transmission input 418; a reversible variator 415 arranged to receive power from the gas turbine engine 10 and to output mechanical power to the second transmission input 418, the reversible variator 415 operable to output in both forward and reverse directions of rotation; and a controller 425 configured to control an output speed and direction of rotation of the reversible variator 415. A speed of the transmission output is a function of a speed of the first transmission input 414, a speed of the second transmission input 418 and the direction of rotation of the variator output. The second transmission input 418 increases the speed of the transmission output when the variator output rotates in the forward direction and reduces the speed of the transmission output when the variator output rotates in the reverse direction. The controller 425 is configured so that, during a start-up process of the cabin blower system 400, the variator output is controlled to rotate in the reverse direction until a start-up threshold condition is satisfied. The variator output is then reversed to rotate in the forward direction.",
  "title": "CABIN BLOWER SYSTEM"
}