Research on Vibration Property of Disc Permanent Magnet Motor

Distribution of 3-D magnetic density of axial flux permanent magnet motor is obtained by calculation of 3-D magnetic field in this paper.The axial electromagnetic force in the air gap is calculated by means of the Maxwell stress tensor method,and the harmonic wave of the force density is analyzed.The principle resulting in axial electromagnetic force in axial flux permanent magnet motor is deduced by numerical algorithm.Modal analysis of an electrical motor is an important method to determine whether the resonance of the stator can be induced under axial electromagnetic forces.The first ten vibration modes of 5kW axial flux permanent magnet motor are calculated by 3-D finite element method.It establishes fundamental for research on relationship between vibration modal orders and sound radiation ratio and prediction of level of vibration and noise.In the last,through experimental investigation of axial flux permanent magnet motor,the relationship between axial electromagnetic force and vibration modal frequencies is examined.