{
  "$type": "site.standard.document",
  "description": "An apparatus for controlling a motor for an electric vehicle and a method for reducing torque ripple using the same are provided. [0002] Since a field current flowing in a field coil of a rotor is controlled by generating a negative phase ripple current with respect to torque ripple according to…",
  "path": "/patents/977644",
  "publishedAt": "2014-03-05T00:00:00.000Z",
  "site": "at://did:plc:oql6ds5vnff4ugar6rruliwd/site.standard.publication/3mn3ohu7oxx5w",
  "tags": [
    "B60L15/20",
    "LG ELECTRONICS INC [KR]"
  ],
  "textContent": "An apparatus for controlling a motor for an electric vehicle and a method for reducing torque ripple using the same are provided. [0002] Since a field current flowing in a field coil of a rotor is controlled by generating a negative phase ripple current with respect to torque ripple according to each position of a rotor of a motor, torque ripple of the motor can be reduced without degrading output torque. In addition, in an operation region of a high torque section, torque ripple is reduced by controlling a field current by increasing an AC component of a negative phase ripple current, and in an operation region of a low torque section, torque ripple is reduced by controlling a field current by decreasing an AC component of a negative phase ripple current. Namely, torque ripple of a motor can be reduced by controlling only a field current without controlling a phase of an output current applied to an armature coil of a stator.",
  "title": "Apparatus for controlling motor for electric vehicle and method for reducing torque ripple using the same"
}