Multi-phase permanent magnet synchronous motor rotor position estimation method

The invention belongs to the field of multi-phase motor control, and relates to a multi-phase permanent magnet synchronous motor rotor position estimation method, which comprises the following steps of: performing Clark transformation on a multi-phase permanent magnet synchronous motor mathematical model under a natural coordinate system to obtain a motor mathematical model under a static coordinate system; according to a motor mathematical model in a static coordinate system, through a full-order observer expression, an estimated value of an extended flux linkage is obtained through calculation; performing differential operation on the extended flux linkage and a reference signal by using the obtained estimated value of the extended flux linkage and a phase-locked loop to obtain a differential output signal; the differential signals pass through a PI controller, extracted rotating speed information is obtained, integration processing is conducted on the rotating speed information, and rotor position informat