Vector controls

Abstract

A brief general overview of flux vector control of induction motors is provided. The flux vector method discussed uses indirect field orientation techniques to determine the magnitude and direction of the air-gap magnetic flux in the motor in order that the stator current can be adjusted, thus providing the required torque. This method effectively provides separate control over the field-producing and torque-producing components of total stator current to give DC machine performance capabilities to the induction motor. It is felt that any application requiring high performance speed, positioning or torque regulation in a hazardous environment will benefit from the lower cost of induction motor use. Continuous ability to produce 100% rated torque and 150% holding for intermittent periods should provide many applications with increased reasons to utilize this technology.