The Weighted Vector Control of Speed-Irrelevant Dual Induction Motors Fed by the Single Inverter

To improve the control performance of unbalanced load of parallel-connected dual induction motors fed by a single inverter, a novel control strategy based on the weighted vector control is proposed. In this paper, a weighted flux linkage vector model of dual induction motors is developed, and then the control expressions of weighted rotor flux linkage and summation torque of dual speed-irrelevant motors are derived. The weight value of vector control for dual induction motors in unbalanced load is distributed automatically according to the torques and motor speeds. The experimental results in multiple induction motor platforms prove that the proposed method can start in a wide load range, especially at heavy unbalanced load and improves the performance of dynamic response with a sudden change of unbalanced load.