Vibration Analysis for Synchronous Motors

Collection frequency depends on equipment criticality and operating conditions. Critical synchronous motors in continuous service typically require monthly vibration surveys at minimum, with more frequent collection warranted when trending indicates a developing fault. Online monitoring systems provide continuous data for the most critical assets.

Standard practice uses triaxial accelerometers mounted at each bearing housing to capture radial and axial vibration in synchronous motors. High-frequency enveloping sensors may be added for early bearing fault detection. Proximity probes are used on equipment with sleeve bearings to measure shaft relative vibration and orbit patterns.

800-1500 hours, depending on which failure mode is developing. Early-stage signatures on Synchronous Motors appear well before functional failure: excitation current drift, power factor degradation. Catching the fault early means scheduling the repair into a planned outage — usually 6 to 16 hours of planned downtime instead of 24 to 72 hours of unplanned downtime when the asset fails on shift.

Critically. A pre-commissioning baseline captured under controlled conditions becomes the reference for every subsequent Vibration Analysis reading. Without that baseline you're measuring against generic ISO thresholds, which can be wrong by 50 percent for a specific asset. Cost of capturing baseline at commissioning is minimal — a single route visit before the asset goes into production service. The data pays back across the next 15 to 25 years of operation.