System and method for universal adaptive torque control of permanent magnet motors

A motor control system configured to control a variety of permanent magnet motors, the motor control system comprising:

• a memory unit having stored therein a torque-current relationship at approximately maximum torque per amp derived based on motor parameters normalized with respect to demagnetization current of a motor;
• and
• a processor configured to access the memory unit and control any of a variety of permanent magnet motors using the torque-current relationship stored therein.

The motor control system 11 further comprising at least one table stored in the memory unit and based on the torque-current relationship at approximately maximum torque per amperage derived based on motor parameters normalized with respect to demagnetization current of the motor.

The motor control system 12 wherein the processor is further configured to use a torque reference value as a first input to a first of the at least one table and a ratio of quadrature and direct inductance of the motor less a predetermined value as a second input to the first table to derive a substantially optimum per-unit stator current using the table.

The motor control system 13 wherein the processor is further configured to use the substantially optimum per-unit stator current as a first input for a second of the at least one table and a ratio of quadrature and direct inductance of the motor less the predetermined value as a second input to the second table to derive at least one of a substantially optimum per-unit direct current and a substantially optimum per-unit quadrature current and derive command direct current values and command quadrature current values using at least the first and second tables to thereby control the motor using conventional current loops by using the command direct current values and command quadrature current values as reference values.