Patent ID: 6952089

Claim:
In a motor drive providing a controller converting command signals to inverter-input signals received by an inverter to produce three-phase motor drive signals, an improvement comprising: a voltage feedback loop acquiring voltage feedback signals measuring the voltage of the three-phase motor drive signals and providing the voltage feedback signals to the controller to correct the inverter-input signals to adjust the voltage of the three-phase motor drive signals to conform with the inverter input signals; wherein the controller includes control logic receiving the command signals to produce the inverter input signals as a vector described by a q-component and a d-component, the vector received by a first transform means converting the vector to the three-phase sinusoidal signals, wherein the voltage feedback loop includes a second transform means converting the voltage feedback signals to a feedback q-component and a feedback d-component and summers subtracting the feedback q-component from the q-component and subtracting the feedback d-component from the d-component, prior to the q-component and d-component being received by the first transform means.