Analysis of rotor excitation influence on electromagnetic vibration of permanent magnet synchronous motor
For permanent magnet synchronous motors of electric vehicle application,high-frequency vibra-tion and noise could be induced by the electromagnetic excitation within air-gap.In current research,e-lectromagnetic forces of air-gap are usually applied to the stator teeth,and then the vibration and noise response of the stator or outer surface of housing is obtained through theoretical calculation or simulation,while the vibration and noise induced by rotor excitation is ignored.In order to study the contribution of rotor excitation to the overall electromagnetic vibration and noise,first,the electromagnetic force harmon-ics were analyzed theoretically with the Maxwell stress tensor method,and then the vibration simulation model of single motor was established.Secondly,taking an 8-pole 48 stator slots interior permanent mag-net synchronous motor(IPMSM)as the prototype,the stator and rotor material parameters were corrected through experimental modal test,and then the rotor dynamic and whole motor dynamic response under the electromagnetic excitation was simulated.The results show rotor resonance could be excited by the unbal-anced electromagnetic force induced by the eccentricity;the responses induced by rotor and stator respec-tively are of equal importance in the low frequency range.Finally,the conclusions above are verified through vibration test on prototype.
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