(1) increase the exciting force wave (wave number of pole pairs).Increasing the radial force produced by the harmonic magnetic field wavenumber, mainly rely on the reasonable selection of the rotor slot set.

(2) the natural vibration frequency stagger frequency of excitation forceand motor structure is important, so to determine the natural frequency of the stator structure, the rotor system and the end cover, and thenatural frequency and main vibration frequency were compared.

(3) increase the stator yoke thickness, in order to improve the stiffness.

(4) adding damping material, in order to increase the dampingperformance of the motor structure. Varnish or epoxy resin to the stator laminations completely glued together, and filling the gap between thecore and the base of the motor, can increase the structural damping.

(5) connected between core stator lamination and base of the machinery,the minimum base vibration. This method is only applicable to large and medium-sized motor, the inner core and the outer base of motor in this case by elastic elements.