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← ScienceWhich risk is exacerbated when inverter-fed induction motors operate near resonance?
A)Increased electromagnetic interference generation
B)Over-voltage across winding insulation✓
C)Elevated common mode current
D)Amplified torsional vibration amplitude
💡 Explanation
Operating near resonance increases the risk of over-voltage because impedance drops, causing amplified voltage stresses through reactive power oscillations; this is inductive resonance, rather than alternative effects like skin effect at higher frequencies or vibration, therefore reducing lifespan of motor winding.
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