Preventing False Brinelling and Static Corrosion in Motor Bearings
When an electric motor sits idle for extended periods, its bearings can suffer two primary failures: false brinelling and static corrosion.
False brinelling occurs when external vibrations—such as those from nearby warehouse equipment—cause the rolling elements to strike the raceway at a single spot repeatedly. Over time, this localized impact peels away tiny metal flakes, leaving a series of evenly spaced wear marks that mirror the spacing of the rolling elements.
Static corrosion happens when either vibration or the weight of a rotor shaft forces grease out of the contact zones between rollers and the raceway. If the grease lacks sufficient corrosion inhibitors, the protective film disappears, exposing metal surfaces to galvanic attack. This leads to rust deposits on the machined surfaces.
Preventing these issues is straightforward: before storage, ensure the bearings are fully greased with a suitable, inhibitor‑rich grease and record the grease type and date on the motor. Place the motor on a vibration‑absorbing foundation—wood or rubber mats work well. Periodically rotate the shaft to redistribute the grease and maintain a continuous protective film.
For more insights on motor maintenance, visit PdMA Corporation.
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