Multi-Vector Electronic Control of an AC Motor Drive Reduces Torque Ripple

By suppressing or controlling harmonic currents and voltages of the motor to overcome torque ripple, this system improves the efficiency and torque performance of an AC motor, especially permanent magnet synchronous motors (PMSM). Many PMSMs use a concentrated winding, and they have large spatial harmonics. PMSMs are controlled by conventional vector control drives, but voltages and current harmonics present in the motor can deteriorate accuracy and efficiency. This technique further improves efficiency and torque performance by reducing the harmonics. This technique can be used in many types of equipment, including trucks and other vehicles, air conditioners, machine tools, robotics, and industrial equipment where quick response and accuracy in speed or position control are required. The controller improvement extends equipment range and life, and heat loss from the motor is minimized. For equipment that uses small, high-RPM electric motors the technology offers high efficiency and better accuracy.

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