All major manufacturers of 3-phase AC induction motors offer “inverter-duty” or “inverter-ready” models, but while these motors have inverter-rated insulation to protect the windings, their most vulnerable parts — the bearings — are too often ignored. Without some form of mitigation, shaft currents can discharge through bearings, causing motor failure and downtime. To be considered truly “inverter-ready”, a motor must have proven long-term bearing protection — an AEGIS® Shaft Grounding Ring — in addition to inverterrated insulation. Unfortunately, many purchasers of these motors do not understand this. And, missioncritical facilities, in which downtime can have disastrous consequences, are especially vulnerable to motor failures.
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