Efficiency of Electric Motors

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Shaded pole motors are only 30% efficient.

Other brushed ones are 60%.

Electrically commutated motors are 70-83% acc to this article.


  • Brushless motors were first made in 1962. [1]


  • Small electric motors are 10-70% efficient. BLDC are Bout 2x as efficient. Good report comparing BLDC to brushed at small scale of few grams - [2]