{
  "$type": "site.standard.document",
  "description": "A thermal stress reduction method includes ramping an electric power generator, 240, to start an aircraft engine, 280, for a time period associated with the aircraft engine start sequence toggling three-level inverter switch array, 300, to a three-level pulse width modulation mode, determining if a…",
  "path": "/patents/982861",
  "publishedAt": "2013-10-23T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "F02C7/26",
    "HAMILTON SUNDSTRAND CORP [US]"
  ],
  "textContent": "A thermal stress reduction method includes ramping an electric power generator, 240, to start an aircraft engine, 280, for a time period associated with the aircraft engine start sequence toggling three-level inverter switch array, 300, to a three-level pulse width modulation mode, determining if a first time interval in the three-level pulse width modulation mode exceeded a predetermined three-level pulse width modulation mode interval, in response to the first time interval exceeding the three-level pulse width modulation mode interval, toggling the three-level inverter switch array to a two-level pulse width modulation mode, determining if a second time interval in the two-level pulse width modulation mode exceeded a predetermined two-level pulse width modulation mode interval and in response to the second time interval exceeding the two-level pulse width modulation mode interval, toggling the three-level inverter switch array to the three-level pulse width modulation mode.",
  "title": "Thermal stress reduction in aircraft motor controllers"
}