Motor control system for limiting regenerative current

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, a torque producing current, and a field weakening current;
• and
• a control module in communication with the motor and configured for limiting the regenerative current to a threshold value in a second quadrant and a fourth quadrant of operation, the control module receiving a motor torque command, comprising:
• a control logic for identifying the 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 monitoring the motor for the torque producing current and the field weakening current;
• a control logic for calculating a target torque producing current based on the motor torque command;
• a control logic for comparing the torque producing current with the target torque producing current and the field weakening current with the target field weakening current;
• a control logic for determining a phase advance angle configured to generate the 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 second quadrant and the fourth quadrant of operation.