How do I calculate motor full-load current from nameplate?

For 3-phase: I = P / (√3 × V × cos φ × η). For 1-phase: I = P / (V × cos φ × η). Where P is rated power in watts, V is voltage, cos φ is power factor, and η is efficiency.

What is the difference between nameplate kW and electrical input kW?

Nameplate kW is the mechanical output power at the shaft. Electrical input = nameplate kW / η. The current drawn from the supply is based on the electrical input power, not the shaft output.

What are typical motor efficiency values?

IE1: 82-90%, IE2: 85-92%, IE3: 87-95%, IE4: 90-96%. Efficiency depends on motor size — larger motors are more efficient. Always use the nameplate value if available.

Why does my measured current differ from calculated?

Common reasons: motor not at full load (current is proportional to load), supply voltage differs from nameplate, ambient temperature affects winding resistance, harmonics from VFD supply.

Can I use this for DC motors?

For DC motors: I = P / (V × η). No power factor term since DC has no reactive component. This calculator supports DC mode selection.

Herramienta de ingeniería gratuita

Calculadora de Corriente de Placa de Características del Motor

Calcule los amperios a plena carga (FLA) a partir de los datos de la placa de características del motor. Compatible con motores trifásicos y monofásicos.

TrifásicoMonofásicoIEC 60034

Resultados

Corriente a plena carga (FLA)

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Potencia eléctrica de entrada

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Potencia aparente S

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Configuración de fases

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Corriente del motor trifásico

Corriente del motor monofásico

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