Vector control apparatus with servo system of permanent magnet synchronous motor capable of on-line identification of parameter

The utility model relates to a vector control apparatus with a servo system of a permanent magnet synchronous motor (PMSM) capable of on-line identification of a parameter. An apparatus for on-line identification of a parameter is added, on the basis of the conventional vector control of a servo system of a PMSM with decoupling control of a velocity sensor; The apparatus for on-line identification of a parameter carries out an on-line identification of an estimated value of a motor parameter; continuously updates the motor parameter used in operation in the decoupling controller; and the optimal vector control effect is achieved, according to a voltage signal measured from a three phase power supply of the PMSM, a current signal of a three-phase winding of the PMSM and an electric angular velocity signal of the motor.