Energy efficiency of motors and power generators?

This data-file estimates the efficiency of electric motors and power generators, using specific examples and data-points.


This matters as there are around 50bn motors in the world, consuming c45% of global electricity.

Efficiency ratings are generally high, above 90%, although lagging and non-optimized motors can be in the 70-80% range, suggesting huge scope for improvement.

Power generators are effectively just motors wired in reverse. Notes on the functioning and efficiency of motors follow in the final tab .

We have also tabulated the costs of large AC induction motors in the data-file from leading companies such as Regal Rexnord, Grainger and ABB-Baldor.

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