High-precision identification method for initial position of permanent magnet synchronous motor rotor with time delay compensation

The invention discloses a permanent magnet synchronous motor rotor initial position high-precision identification method with time delay compensation, which comprises the steps of determining an estimated value of a rotor initial position and accurately compensating the rotor initial position, when the estimated value of the rotor initial position is determined, after a virtual quadrature-axis current and a virtual electrical angle are given, the rotor initial position is accurately compensated; sampling the rotor position by means of a position sensor, and determining the estimated value of the initial position of the rotor by combining the relationship between the sampled rotor position and the actual angular velocity of the motor; when the initial position of the rotor is accurately compensated, the rotating speed of the motor is subjected to closed-loop control, two different working points of the motor are searched by changing the direct-axis current of the motor, and the compensation angle of the initia