New Equipment Digest

Reed Critical Frequency in Vertical Motors: Improving Resonance Prediction

Vertical motors are prone to resonance because their shaft behaves like a cantilevered reed, making the reed critical frequency (RCF) the first natural bending mode. When operating speeds, especially with variable frequency drives, intersect this frequency, vibration amplitudes can surge, accelerating bearing wear and potential failure. Traditional prediction methods such as finite‑element analysis or bump testing are time‑intensive and often off by up to 20 %. Wolong Electric America’s two‑degree‑of‑freedom model delivers ±5‑10 % accuracy while halving analysis time, giving designers a rapid digital‑twin tool to avoid resonance.