{
  "$type": "site.standard.document",
  "coverImage": {
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  "description": "An electric vehicle includes an inverter unit (22) and an ECU (21). The inverter unit (22) or the ECU (21) includes a magnetic force estimator (38) that estimates a magnetic force of a permanent magnet structure associated with a motor rotor of a motor unit (6). The inverter unit (22) or the ECU…",
  "path": "/patents/980244",
  "publishedAt": "2014-01-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60K17/046",
    "NTN TOYO BEARING CO LTD [JP]"
  ],
  "textContent": "An electric vehicle includes an inverter unit (22) and an ECU (21). The inverter unit (22) or the ECU (21) includes a magnetic force estimator (38) that estimates a magnetic force of a permanent magnet structure associated with a motor rotor of a motor unit (6). The inverter unit (22) or the ECU (21) may also include a determiner (39) for the estimated magnetic force and an abnormalities-responsive motor drive limiter (40). The estimator (38) is configured to estimate, according to a predefined rule, the magnetic force, based on at least two detection signals selected from a group consisting of a detection signal indicating a rotational frequency of the motor unit (6), a detection signal indicating a motor voltage of the motor unit (6) and a detection signal indicating a motor current of the motor unit (6).",
  "title": "ELECTRIC AUTOMOBILE"
}