{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
    "ref": {
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    "mimeType": "image/png",
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  "description": "A rail vehicle (10) comprises: a permanent magnet synchronous motor (3); an inverter (1) for driving the permanent magnet synchronous motor (3); and a vehicle speed sensor (9) for detecting the vehicle speed VTcar. The initial rotational speed Éest0 is estimated based on the vehicle speed VTcar…",
  "path": "/patents/964307",
  "publishedAt": "2015-01-07T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L15/20",
    "TOSHIBA KK [JP]"
  ],
  "textContent": "A rail vehicle (10) comprises: a permanent magnet synchronous motor (3); an inverter (1) for driving the permanent magnet synchronous motor (3); and a vehicle speed sensor (9) for detecting the vehicle speed VTcar. The initial rotational speed Éest0 is estimated based on the vehicle speed VTcar; the angular velocity (Éest) is estimated, taking the initial rotational speed (Éest0) as the initial value; the rotational phase angle (¸est) is estimated based on the angular velocity (Éest); and the inverter (1) is controlled based on the rotational phase angle (¸est).",
  "title": "MOTOR CONTROL DEVICE AND CONTROL METHOD THEREFOR"
}