Unwind Drive Cooling Fan Beat Frequency ©Bill Kilbey 2009.

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Presentation transcript:

Unwind Drive Cooling Fan Beat Frequency ©Bill Kilbey 2009

High 1x Cooling Motor/Fan Constant Speed Motor/fan sit on top of large variable speed motor, fan mounted directly on motor shaft The fan is subject to buildup of dirt/product 1x TS dominant with amplitudes increasing Attempt to balance was not successful – Varying amplitude 1mil pk-pk to 7mils pk-pk – Unstable phase ±100⁰

High 1x TS

High Resolution Spectrum

High Resolution Spectrum Zoom

Spectrum from other cooling fan

Calculations – = 3.8 RPM Delta (.063 Hz) The inverse of Diff. F1-F2 = T beat T beat = 15.8 secs. approx.

Time waveform beat on #2

Time waveform beat on #3

#2 PM Fan #3 PM Fan