Simulation of Three-Dimensional Magnetic Flux Density of Permanent Magnet Synchronous Motor

Flux density analysis is an integral part of the design process of permanent magnet synchronous motors (PMSM). However, most of the existing studies on the flux density analysis of PMSM are based on two-dimensional plane, and the analysis of flux density of PMSM is relatively simplified, ignoring the influence of motor structure on the flux density distribution, the requirements for magnetic field analysis in the design of motor structures are not well met. In this paper, the three-dimensional simulation and magnetic field analysis of PMSM are carried out by simulation software to obtain the flux density distribution of each part of motor in steady state, which effectively makes up for the shortage of two-dimensional plane electromagnetic simulation of motor; meanwhile, the flux density distribution of each part of motor is obtained after rotating a sector angle by simulation calculation, and analyses the internal flux change during the motor operation. The result shows that the minimum flux density mode appears in the stator boot, and the flux density distributed in the stator yoke is smaller than that in the teeth. During the rotating of motor, the flux density distribution of the permanent magnet remains basically the same, and flux density at axial surface of rotor along rotation direction of motor is larger than that at position opposite to rotation direction. This research has provided a theory for verifying the three-dimensional flux density variation of PMSM.