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Mechanical vibration. Vibration of rotating machinery equipped with active magnetic bearings - Evaluation of stability margin Ingestion-build-264231 Who is BS 6912-19 -1 Scope This part of ISO 14839 establishes the stability requirements of rotating machinery equipped with active magnetic bearings (AMB). It specifies a particular index to evaluate the stability margin and delineates the measurement of this index. It is applicable to industrial rotating machines operating at nominal power greater than 15 kW, and not limited by size or operational rated speed. It covers both rigid AMB rotors and flexible AMB rotors.