Ordering a motor with a precision balance grade or having the motor field balanced will result in the lowest possible vibration levels. On a vertical turbine pump, the motor balance primarily drives this based on the location vibration measurements are taken (top of discharge head). The higher the balance grade (lower permissible unbalance) the lower the vibration readings. Calculation or analysis margin should be larger than required field margin to account for uncertainties, consult the manufacturer for recommendations. A field margin of +/-10% is recommended to ensure low vibration levels.Ī structural natural frequency calculation or analysis (sometimes referred to as a reed critical frequency, RCF) will ensure proper design. Operating on the structural natural frequency of the discharge head motor assembly will result in unacceptable vibration levels. Separation margin to structural natural frequency.
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