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Amplitude of harmonics higher than fundamental frequency

  1. Mar 29, 2013 #1
    Dears,

    I have an vacuum pump creating the vacuum approximately 10^-8 mbar. The rotor consists blades and it's placed in bearings. One side is ceramic bearing and the other one is maglev type(magnetic). I measure noise and vibrations of the pump. Significant peak of both units is naturally at rotating frequency (1000Hz). The spectrum of both units is shown in attachments. All other pumps measured have significant noise only on 1000Hz, on other frequencies is negligible. Does anyone hav an idea what can cause such behaviour? Thanks
     

    Attached Files:

  2. jcsd
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