Loss minimization control of linear induction motor under light load conditions

Abstract:
In response to the current demand for efficiency improvement in linear motor applications and the difficult trade-off between accuracy and complexity of loss models in their efficiency optimization strategies, a new minimum loss strategy is proposed for linear induction motors that considers the effects of dynamic edge-end effects and leakage inductance while being moderately complex. The d-q axis current is rebalanced by calculating the optimal magnetic chain. The article first derives a new steady-state loss model based on an improved mathematical model of a dual three-phase linear induction motor, and from this model a complete minimum loss control strategy is designed. For a linear induction motor with a rated power of 3 kW, the simulation verifies that this strategy reduces the losses by about 220 W (43%) compared with the conventional FOC strategy at a light load of 0. 2 p. u. and 5 m/s, while the thrust fluctuation is significantly reduced, which verifies the loss reduction effect of the new strategy.