Permanent magnet synchronous motor model prediction speed control method based on additive state decomposition

The invention discloses a permanent magnet synchronous motor model prediction speed control method based on additive state decomposition. The method comprises the following steps: establishing a mathematical model of a surface-mounted permanent magnet synchronous motor under a dq synchronous rotating coordinate system; equivalently decomposing a speed subsystem into a nominal main system and an auxiliary system containing uncertainty by utilizing an additive state decomposition technology; aiming at the main system, designing an exponential convergence type model prediction controller, so that the tracking error of the output of the main system to the given reference rotating speed is asymptotically converged to be near 0 in an exponential form; for the auxiliary system, designing a generalized proportional-integral observer to estimate the total disturbance of a speed subsystem on line, and on the basis, designing a state feedback control law based on disturbance active compensation to suppress the influence