Controller anti-windup for permanent magnet synchronous machines

A method for preventing controller windup in an electric motor, the method comprising:

• generating, by a first anti-windup module, a first modified current command by modifying a current command that is applied to a motor control system based on a ratio of a commanded voltage corresponding to the current command and a limited voltage command;
• generating, by a second anti-windup module, a second modified current command by modifying the first modified current command based on a difference between the commanded voltage and the limited voltage command;
• and
• using, by a controller, the second modified current command as input to determine a voltage to be applied across the electric motor for torque generation.

A system for preventing controller windup in a motor control system, the system comprising:

• a current command generator that generates a current command that is input to the motor control system based on a torque command indicative of an amount of torque to be generated using an electric motor;
• a controller that generates a commanded voltage corresponding to the current command;
• a limiting module that determines a limited voltage command in response to the commanded voltage exceeding an available voltage of a motor power source, the limited voltage command being applied to the electric motor;
• and
• an anti-windup module that receives the commanded voltage and the limited voltage command, the anti-windup module generates a modified current command by modifying the current command, the modification based on a difference between the commanded voltage and the limited voltage command, the anti-windup module uses an integrator back calculation to generate the modified current command, the integrator back calculation comprising scaling the difference using a gain matrix
• G
• AW
• =
• [
• G
• Add
• G
• Adq
• G
• Aqd
• G
• Aqq
• ]
• ,
• where GAdd, GAdq, GAqd, and GAqq are non-zero anti-windup parameters.