A 200 kW permanent magnet synchronous reluctance motor was designed. However, it was found that the prototype motor made noises when the rotor speed was close to 2 600 r/min. An easier analysis method of the motor’s noise was proposed. The noises of the motor were analyzed by the MATLAB software. The resonance frequencies of the components of the motor were analyzed using the finite element analysis method. The noise source of the motor was confirmed by comparing the motor noise spectrum with the analyzed resonance frequencies. According to the experimental result, the noise of the motor was visibly reduced after optimal design.