3 Phase Induction Motor Full Load Power Factor

[Physicist3]

Hi, If the voltage, full load current and full load output power (kW) of a 3 phase induction motor are known, and the efficiency is assumed to be 90% (is this realistic), am I correct in thinking that the full load power factor can be approximated (due to assumed and not actual efficiency) as follows;

P.F. = Output Power/(√3 * V_Line*I_Line*Efficiency)

E.g. Is the approximate full load power factor obtained by the Full Load Output Power (Mechanical Watts) divided by the full load kVA * Efficiency?

 

[Mike_In_Plano]

Let's see:
Pout = Pin x Eff => Pin = Pout / Eff

PF = Pin / (sqrt(3) x VA)

PF = Pout / (sqrt(3) x VA x Eff)

Looks good.