Built-in pole-changing permanent magnet synchronous motor rotor reverse salient pole design method

The invention relates to a reverse salient pole design method for a built-in pole-changing permanent magnet synchronous motor rotor, which is characterized by comprising the following steps of: determining a continuous pole magnetic pole structure in which N poles or S poles are continuously distributed when a motor operates at 8 poles, and determining a traditional magnetic pole structure in which N poles and S poles are alternately distributed when the motor operates at 4 poles; a reverse salient pole rotor structure of the motor is provided, and the winding inductance Ldgt under two pole numbers is realized by adopting strip-shaped and arc-shaped magnetic barriers, non-uniform air gap length reduction and other measures; lq; the deviation angle of the end points of the arc-shaped magnetic barriers is A, the thickness of the part, protruding towards the air gap direction, of the rotor iron core in the center of the permanent magnet is B, the angle between the arc end points of the protruding part and the ce