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eng.motor-efficiency-IE-class Calculator
Calculates motor efficiency class (IE1 to IE5) from motor losses and compares to IEC 60034-30-1 standard thresholds. IE3 (Premium Efficiency) is the mandatory minimum for 0.75–375 kW motors in the EU as of 2021 — IE4 and IE5 provide additional energy savings.
Inputs
Rated Power Kw
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Input Power Kw
Rate of energy transfer (W). P = V×I (electrical). P = F×v (mechanical). 1 horsepower ≈ 746 W.
Full Load Rpm
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Sync Rpm
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Results
efficiency η
Useful output divided by total input, as a percentage. True 100% efficiency is impossible — losses appear as heat. LEDs: 30–50%. Electric motors: 85–97%. Switching supplies: 85–95%.
slip s
Slip -- the difference between synchronous speed and actual rotor speed in an induction motor, as a fraction. Normal slip: 2-8%. Higher slip means more torque but more heat.
losses (kW)
The decrease or degradation from the baseline.
IE class (indicative)
The classification assigned based on the computed value.
η = Pout/Pin
Sample size or count used in the calculation.
IEC 60034-30 22kW 4-pole IE3
Reference formula or conversion factor shown for context.