{
  "$type": "site.standard.document",
  "description": "A method for performing rotational speed synchronisation of a first transmission component (32,34) having a first initial rotational speed with a second transmission component (18) having a second initial rotational speed, by means of a three-phase AC electric motor (2b) that is rotationally…",
  "path": "/patents/1421650",
  "publishedAt": "2022-09-28T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L15/2054",
    "NINGBO GEELY AUTOMOBILE RES & DEVELOPMENT CO LTD [CN]"
  ],
  "textContent": "A method for performing rotational speed synchronisation of a first transmission component (32,34) having a first initial rotational speed with a second transmission component (18) having a second initial rotational speed, by means of a three-phase AC electric motor (2b) that is rotationally connected to the first transmission component (32,34), during a gear switch in a stepped gear transmission (6) of a drive train (4) having a switching mechanism (50) enabling the stator windings (W1-W3) of the AC electric motor (2b) to be selectively connected in star configuration or delta configuration. The method comprising obtaining a command, or determining, that a gear switch should be performed; shifting the stator winding configuration of the AC electric motor (2b) to delta configuration, or ensuring that the stator winding configuration of the AC electric motor (2b) is in delta configuration; and controlling operation of the AC electric motor (2b) for accomplishing rotational speed synchronisation of the first and second transmission components (32,34,18). The disclosure also relates to a corresponding electrical powertrain system for a vehicle.",
  "title": "METHOD FOR PERFORMING ROTATIONAL SPEED SYNCHRONISATION"
}