Motor Control System For Limiting Regenerative Current

A motor control system, comprising:

• a motor operating at a rotational velocity, the motor operating to create a regenerative current, the motor having a target field weakening current that is configured for limiting the regenerative current to a threshold value in a second quadrant and a fourth quadrant of 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, the control module receiving a motor torque command, comprising:
• a control logic for identifying the target field weakening current based upon the motor torque command and the rotational velocity 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 to generate the target field weakening current;
• 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.