Have you experienced electrostatic earthing issues in rotating machinery with bearings, possibly caused by electromagnetic forces from the impeller? Share your insights on the potential failure modes associated with this problem.
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Indeed, I have encountered earthing issues in rotating machinery, specifically in electric motor bearings. This is often attributed to the inverter-induced shaft voltages, which cause an electrostatic discharge to ground through the bearings leading to fluting damage. This ultimately reduces the lifespan of the bearing. One solution is using insulated bearings or hybrid bearings which incorporate ceramic rolling elements to minimize the destructive effect of stray currents. On another note, introducing a shaft grounding ring can also help to mitigate this issue as it provides a direct path for the current to the ground, bypassing the bearings.
Indeed, I have experienced this issue while working with rotating machinery. One possible failure mode that I observed was premature bearing failure which was mainly caused by the electrical current passing through the bearings, thereby causing pit formation and fluting. A solution for this can be using insulated bearings or hybrid bearings with ceramic rolling elements which can resist electrical current. Additionally, grounding the shaft directly can also provide a path of least resistance and prevent bearing damage. Preventative maintenance and regular inspection should also not be overlooked.
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Answer: 1. What are some common failure modes in rotating machinery with bearings due to electrostatic earthing issues? - Common failure modes include bearing damage, electrical discharge damage, and increased risk of equipment failure.
Answer: - Electromagnetic forces can generate static electricity, which can interfere with proper grounding of the machinery, leading to potential earthing issues.
Answer: - Proper grounding techniques, regular maintenance checks, and monitoring of electrical discharge levels can help mitigate electrostatic earthing issues in rotating machinery with bearings.
Answer: - Neglecting these issues can result in premature bearing failure, electrical damage to components, and increased downtime and maintenance costs.
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