Patent ID: 8232760

Claim:
A control system for controlling an AC motor drive, the control system programmed to: input an initial voltage-frequency command to the AC motor drive based on an initial voltage/frequency (V/Hz) curve; receive a real-time output of the AC motor drive generated according to the initial voltage-frequency command; feedback a plurality of modified voltage-frequency commands to the AC motor drive, each of the plurality of modified voltage-frequency commands comprising a deviation from the initial V/Hz curve; determine a real-time value of the motor parameter corresponding to each of the plurality of modified voltage-frequency commands; and feedback a modified voltage-frequency command to the AC motor drive so that the real-time value of the motor parameter is within a motor parameter tolerance range; wherein the modified voltage-frequency command operates the AC motor drive at a reduced input power as compared to the initial voltage-frequency command, while maintaining the real-time value of the motor parameter within the motor parameter tolerance range.