Formulas:
Single Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × cos ϕ)
Single Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × cos ϕ × η)
Three Phase AC Motor FLA (Amperes) = (P [kW] × 1000) / (V × 1.732 × cos ϕ)
Three Phase AC Motor FLA (Amperes) = (P [HP] × 746) / (V × 1.732 × cos ϕ × η)
Where:
P [HP] , P [kW] = Motor power rating (HP or kW),
V = Motor rated voltage (Volts),
η = Motor efficiency in decimal form,
cos ϕ = Motor power factor,
1000 = Conversion factor to convert kW to W,
746 = Conversion factor to convert HP to W.
Online Calculation for 3 Phase Induction Motor