Effect of Phase Shift Angle on Radial Force and Vibration Behavior in Dual Three-Phase PMSM

This article investigates the effect of phase shift angle on radial force and vibration behavior in the dual three-phase permanent magnet (PM) synchronous motor (DTP-PMSM). First, the elimination principles of stator magneto-motive force and radial force harmonics with different phase shift angles are derived. Afterward, a 48-slot/22-pole DTP-PMSM with appropriate windings configurations are analyzed from the perspectives of the electromagnetic performance and vibration behavior in detail. It is found that the 7.5 degrees and 30 degrees configurations have great significance for reducing the amplitude of radial force harmonics. The 7.5 degrees configuration has the lowest second-order radial force amplitude, while the 30 degrees configuration has the smallest amplitude of fourth-, sixth-, and eighth-order radial forces. According to the results calculated by the multiphysics vibration prediction model, the 30 degrees configuration has lower vibration acceleration in the entire frequency band. Finally, the prototypes of the 48-slot/22-pole DTP-PMSMs with 30 degrees and 60 degrees phase shift angle are fabricated. The tests are conducted to validate the theoretical analysis.

Automated summary

This article investigates the effect of phase shift angle on radial force and vibration behavior in the DTP-PMSM, finding that the 7.5 degrees and 30 degrees configurations are significant in reducing radial force harmonics.