| A new efficiency controller was created to improve the operation of a three-phase induction machine under light loads using Direct Torque Control. The design, simulation, and verification of the controller were presented at each step of development. Space Vector Modulation-Direct Torque Control was also expanded with an algorithm created out of necessity. The new algorithm provided a more complete implementation of the equations on which the accepted controller is based. Tests were performed under various load conditions. The results showed a small contribution at medium loads. At light loads, the efficiency controller provided a 15% improvement in efficiency. An additional benefit was discovered in the ability regulate small torques at light loads which were much more difficult to regulate without the efficiency controller enabled. |
