Motor efficiency regulation: what changes at the next replacement

Like-for-like motor replacement is increasingly not an option. Understanding the efficiency requirement before failure avoids an expensive surprise.

David HarringtonHead of Engineering12 June 20269 min read

The replacement is not always equivalent

Efficiency requirements have moved several times, and a motor installed under a previous regime may no longer have a direct equivalent. Frame dimensions usually carry across, but starting current, thermal behaviour and inverter suitability may not.

Check the drive at the same time

Higher efficiency motors can present different inrush and harmonic characteristics. Where an existing drive is retained, compatibility should be confirmed rather than assumed, particularly on long cable runs.

Plan before the failure

The worst time to discover a motor has no direct replacement is when it has already failed. Reviewing the installed base against current requirements is a short exercise that avoids a long outage.

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