{
  "$type": "site.standard.document",
  "description": "An elevator machine assembly includes a motor and an elevator drive configured to control power supply to the motor. The elevator drive includes at least a plurality of converter switches and an energy storage device that is situated to be charged in response to the motor generating a back emf as…",
  "path": "/patents/1390947",
  "publishedAt": "2026-04-01T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B66B1/06",
    "OTIS ELEVATOR CO [US]"
  ],
  "textContent": "An elevator machine assembly includes a motor and an elevator drive configured to control power supply to the motor. The elevator drive includes at least a plurality of converter switches and an energy storage device that is situated to be charged in response to the motor generating a back emf as the motor rotates in response to a torque applied to the motor when the elevator drive is not providing power to the motor. A short-circuiting module that is selectively coupled with the energy storage device through the converter switches selectively discharges the energy storage device to limit the back emf of the motor and a corresponding speed at which the motor rotates.",
  "title": "AN ELEVATOR MACHINE ASSEMBLY AND A METHOD OF USIGN AN ELEVATOR MACHINE"
}