Which symptom indicates a failing capacitor in a three-phase induction motor drive circuit?

💡 Explanation

When a capacitor fails in a three-phase motor drive, the voltage balance between phases is disrupted because the capacitor's reactive impedance changes, which leads to instability in the PWM control and motor speed. Therefore unstable speed control results, rather than temperature increase, improved harmonics, or reduced EMI which require distinct circuit faults.

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