In a 3-phase 208v. circuit feeding a 220v. motor, we are installing voltage boosting autotransformers for voltage correction; we know how to do this. The question is how voltage at the motor terminals is affected by varying the motor current. Under light load conditions motor now draws 7.6 amps (208v. 3-ph.) but when heavily loaded approaches nameplate rating of 11 amps. If we size boosting transformers for the 11-amp load, what voltage will we have at 7.6-amps?
How is this calculated? I know it will be proportional to the current change, but cannot find a formula or explanation in any reference.
How is this calculated? I know it will be proportional to the current change, but cannot find a formula or explanation in any reference.