Research On Characteristics Of Vibration And Noise For Axial Flux Permanent Magnet Synchronous Motor

Axial flux permanent magnet synchronous motor is very suitable for some special applications such as limited installation space and compact structure because of its special structure and large power density.However,the problem of vibration and noise generated by the motor in operation has been the subject of long-term attention and research by many scholars.In this paper,the vibration and noise of axial flux permanent magnet synchronous motor are studied in the following aspects:The air gap magnetic field of an axial-flux permanent magnet synchronous motor with double stator and single rotor with insert magnets is analyzed.An analytical model for calculating the air gap flux density of axial flux permanent magnet synchr onous motor is established.And the axial flux motor no-load condition axial air-gap magnetic field and three-phase armature winding of the stator under the action of axial air-gap magnetic field are calculated by using no-load condition of air-gap magnetic field and the armature winding magnetic field under the action of the air-gap magnetic field of the motor load conditions.The results of the analytical method are verified by 3D finite element simulation calculation results.The results show that the analytical method is in good agreement with the finite element method,which provides a new idea for the analytical analysis and optimal design of the axial flux permanent magnet synchronous motor.The 3D model of the axial flux permanent magnet motor is est ablished and its modal analysis is carried out.The modal shapes and natural frequencies of the stator,the casing and the whole machine are calculated.The modal analysis of the stator with different yoke thickness and different backboards structure is completed.The influences of different structures on the modal shapes and natural frequencies of the stator a nd the whole motor are obtained.A dynamic parameter design modification method is proposed to avoid the resonance caused,in order to avoiding the modal frequencies of the motor closing to the main frequencies of axial electromagnetic force wave.The vibration and noise of the axial flux permanent magnet synchronous motor are analyzed by using the 3D finite element analysis software ANSYS Maxwell3 D and the Workbench Harmonic Response analysis module.The vibration displacement and deformation of the axial motor are calculated.Then,the distribution law of noise pressure level is obtained when the motor is running.At the same time,the noise pressure levels of the motors with different backboards are analyzed and calculated.The results show that the added sector-shaped backboards have better noise suppression effect than the circular backboards,which provides a design method for the vibration noise suppression of the axial flux-permanent magnet motors.