{
  "$type": "site.standard.document",
  "coverImage": {
    "$type": "blob",
    "ref": {
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  "description": "The controller estimates torque output by the motor and controls the current supplied to the motor in such a manner that a torque estimate of the motor obtained by the estimation corresponds to the torque command value. A torque estimation calculator 120 estimates the torque output by the motor. A…",
  "path": "/patents/973385",
  "publishedAt": "2014-06-25T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L15/20",
    "HITACHI CONSTRUCTION MACHINERY [JP]"
  ],
  "textContent": "The controller estimates torque output by the motor and controls the current supplied to the motor in such a manner that a torque estimate of the motor obtained by the estimation corresponds to the torque command value. A torque estimation calculator 120 estimates the torque output by the motor. A phase error command calculator 125 calculates a command value of a phase error from the deviation between the torque estimate and a torque command value. A speed estimation calculator 130 outputs a speed estimate in such a manner that a phase error estimate corresponds to the command value of the phase error.",
  "title": "MOTOR CONTROL DEVICE AND WORK MACHINE USING SAME"
}