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  • Users: badvibes
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  1. badvibes

    DC Motor Search

    I am in the process of designing a high speed rotary surgical hand-piece (drill). The hand-piece must be a DC motor (brushed or brushless). The specifications of the hand-piece are as follows: 1)0 - 45,000 rpm (variable speed) 2) ozf-in torque through-out entire speed range 3)battery source to...
  2. badvibes

    Pump Natural Frequency

    I have a velocity/CPM peak vibration spectrum plot of an Aurora fire pump with 6 impellers. The pump operates at 3550rpm and weighs 2275lbs. How can I determine the natural frequency from the spectrum plot? It shows consistent spikes at 2X,3X,4X,5X and 6X(BPF) and there is a high spike at...

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