Device and method for identifying equivalent circuit parameters of an alternating current synchronous motor without using a rotary encoder

摘要

The method involves searching standstill position of the rotor, so that aligning flux axial direction of the rotor opposite to axial direction of the stator. A test signal voltage supply is applied in the flux axial direction of the synchronous motor. The equivalent circuit parameters of the synchronous motor are identified based on the test signal voltage and measuring signal current in the flux axial direction, such that the torque-free is remained in rotor. Independent claims are included for the following: (1) identification apparatus for identification without shaft encoder of electrical equivalent circuit parameter of three-phase asynchronous motor; and (2) motor control device for shaft-encoderless control of three-phase asynchronous motor.