Modeling and parameter optimization method and system for sinusoidal permanent magnet motor with mixed magnetic poles

The invention relates to the technical field of permanent magnet motors, and provides a modeling and parameter optimization method and system for a mixed magnetic pole sinusoidal permanent magnet motor. The analysis modeling method comprises the following steps: according to the residual magnetism distribution and air-gap magnetic field boundary conditions of the motor permanent magnet assembly, calculating the slotless air-gap magnetic flux density of the motor permanent magnet assembly under the motor no-load condition under different residual magnetisms and different fan-shaped angles; according to a stator slot model of the motor, establishing a relational expression between the relative permeability of the air gap and the slot opening under the no-load condition, and performing Fourier decomposition calculation to obtain the relative permeability of the slotted air gap; in a complex coordinate system, according to the slotless air gap magnetic flux density and the slotted air gap relative permeability, t