Abstract

To study the characteristic frequency of the vibration and noise source of the linear induction motor (LIM) in the mediumlow speed maglev train powered by inverter, this paper measured the three-phase current powered by inverter and input the current into the LIM finite element model. The LIM air-gap magnetic field was calculated by the finite element method, and the main harmonic frequency of the air-gap magnetic field in inverter power supply was analyzed from its spectrum. The LIM electromagnetic force and its characteristic frequency were analyzed and calculated by finite element method and analytical formula. The natural mode shape and frequency of the motor stator were calculated by the finite element method, finding out that the natural mode frequencies of the motor have resonance frequency bands with the harmonic components of the electromagnetic force. The tests of the LIM vibration and noise under inverter power supply showed that the frequencies of vibration and noise are consistent with the frequencies of current and electromagnetic force harmonics, indicating that the current harmonics under inverter power supply is the main reason for the LIM vibration and noise.

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