Double‑Cage Rotor Testing: Key Considerations for Reliable Motor Performance
In the PdMA tip of January 5, the double‑cage rotor’s design was explained. To safeguard motor reliability, it is essential to focus on the In‑Rush/Start‑Up test as a baseline. Because the majority of high‑frequency start‑up current flows through the smaller outer bars, start‑up stresses are concentrated there, increasing the risk of stress cracks or breaks from non‑symmetrical thermal expansion.
At normal operating speed, current distribution is more balanced across inner and outer bars, which can mask a fault in the outer bar. This masking delays detection of rotor degradation and can lead to secondary stator damage if left unaddressed. Comparing a new In‑Rush/Start‑Up test to the baseline provides clear evidence of rotor health changes, enabling proactive measures to avoid unplanned outages.
For detailed rotor testing techniques, consult the Rotor Fault Zone analysis module: Rotor Fault Zone.
Read the full January tip: PdMA Tip of the Week.
Learn more about PdMA Corporation: pdma.com.
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