Vibration Suppression of Flux-Concentrated Phase-Group Centralized Winding PMSM With Auxiliary Stator Based on Magnetic Field Editing Approach

The flux-concentrated phase-group centralized winding permanent magnet synchronous machine (FPCW-PMSM) exhibits excellent torque performance due to its integrated structure, but the complex air-gap harmonics make its vibration problem more pronounced. In this article, a 24-slot/26-pole FPCW-PMSM is investigated and the intensive torque and vibration performance comparison between machines with the single-stator and auxiliary stator is presented. The principle of editing the magnetic field of the auxiliary stator to suppress the cogging torque and vibration is elucidated. First, the topology and working principle of FPCW-PMSM are analyzed, and the reasons for improved torque performance of this type of machine are revealed. Subsequently, the cogging torque, output torque, electromagnetic force, and vibration before and after magnetic field editing are compared, and the dislocation angle of the inner and outer stator teeth with the smallest cogging torque is studied in detail. It is found that adding an auxiliary stator has great significance for reducing cogging torque, torque ripple, and electromagnetic vibration of the FPCW-PMSM. Finally, the prototype of a 24-slot/26-pole FPCW-PMSM with an auxiliary stator is manufactured, then the theoretical and finite element analysis results are verified by modal test, no-load test, load test, and vibration test by laser vibrometer.