Velocity sensor-less permanent-magnetic synchronous motor vector control device with online parameter identification function

The utility model relates to a velocity sensor-less permanent-magnetic synchronous motor vector control device with an online parameter identification function, which is characterized in that on the basis of the vector control of a permanent-magnetic synchronic motor servo system without the decoupling control of a velocity sensor, an online parameter identification device is added; and according to a voltage signal detected from a permanent-magnetic synchronic motor three-phase power supply, a current signal in a permanent-magnetic synchronic motor three-phase winding and an electricity angle speed observation value of a motor, the online parameter identification device can identify an evaluation value of a motor parameter on line, and continuously updates a motor parameter used in the computing of a decoupling controller and a rotation speed and angle observer, so that the best vector control effect can be obtained.