Automatic calculation of the efficiency of an electric motor, formula and table

How to calculate the efficiency of a three-phase motor

With this efficiency calculator for motors you can convert and calculate online automatically, easily, quickly and for free any efficiency associated with electric motors. We also show you the most common power factor values. Formulas for calculating the efficiency of DC, AC, single-phase, two-phase and three-phase motors: Formula motor DC efficiency: Formula motor efficiency AC, …

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Typical common efficiencies of electric motor ODP and TEFC

Typical common efficiencies of electric motor ODP and TEFC-min

NEMA Design B Electrical Motors Efficiency Electrical motors constructed according NEMA Design B must meet the efficiencies below. Power (hp) Minimum Nominal Efficiency1) 1 – 4 78.8 5 – 9 84.0 10 – 19 85.5 20 – 49 88.5 50 – 99 90.2 100 – 124 91.7 > 125 92.4 1) NEMA Design B, Single Speed 1200, …

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