{
  "$type": "site.standard.document",
  "description": "A brushless motor comprises: a stator having armature coils , and ; a rotor which is rotated by a revolving magnetic field; and a switching element , wherein the brushless motor has a rotation number control unit which switches between low-speed and high-speed mode, wherein in the low-speed mode…",
  "path": "/patents/1385024",
  "publishedAt": "2017-11-09T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "H02P6/153",
    "Mitsuba Corporation"
  ],
  "textContent": "A brushless motor comprises: a stator having armature coils , and ; a rotor which is rotated by a revolving magnetic field; and a switching element , wherein the brushless motor has a rotation number control unit which switches between low-speed and high-speed mode, wherein in the low-speed mode, the rotation number control unit supplies current to the armature coils , and at predetermined energization timing and controls a duty ratio to control the rotation number of the rotor , and in the high-speed mode, the rotation number control unit supplies current to the armature coils , and at energization timing advanced from the energization timing for the low-speed mode, thereby performing field weakening control of weakening the revolving magnetic field from that of the low-speed mode to control the rotation number of the rotor",
  "title": "BRUSHLESS MOTOR AND WIPER APPARATUS"
}