Patent ID: 8896244

Claim:
A motor control system, comprising: a motor operating at a rotational velocity, the motor creating a regenerative current during a portion of the motor operation, the motor having a plurality of motor circuit parameters; and a control module in communication with the motor and configured to limit the regenerative current to a threshold value, the control module receiving a motor torque command, comprising: a control logic for identifying a target field weakening current value sufficient to limit the regenerative current to the threshold value, the control logic configured to identify the target field weakening current value based upon the motor torque command and the rotational velocity of the motor, the control logic identifying the target field weakening current using a plurality of variable values of the target field weakening current stored in a memory and based on the motor torque command, the rotational velocity and a quadrant of operation of the motor; a control logic for determining a phase advance angle configured to generate a field weakening current at the target field weakening current value; and a control logic for determining a motor voltage command based on the motor torque command, the rotational velocity and the plurality of motor circuit parameters, the motor voltage command applied at the phase advance angle during the portion of the motor operation in which the motor is creating the regenerative current.