article · IEEE Transactions on Power Electronics
Linear induction machines require control strategies that achieve rapid dynamic response while limiting thrust ripple and operational energy losses. A robust speed control method combines sliding mode direct thrust control with space vector modulation based on secondary flux-linkage orientation. To enhance electrical efficiency, an improved maximum thrust per ampere technique reduces primary current and copper losses under a constant thrust output. The performance of this strategy was evaluated against conventional direct thrust control and field orientation control across different operating states. Validation via simulations and physical laboratory experiments on two 3 kW arc induction machine prototypes confirmed that the approach successfully provides faster dynamic tracking alongside lower thrust ripple.
Smooth and efficient propulsion is critical for linear motor systems such as linear metros. Reducing thrust ripple lowers mechanical vibration and improves passenger ride quality, while cutting electrical current losses lowers power consumption. Achieving faster dynamic response helps electric transport systems maintain precise speed control under varying loads and operational conditions.
The method is applicable to linear metro rail systems and linear induction motor drive manufacturers aiming to improve propulsion efficiency and reduce thrust fluctuations. Tested experimentally on a laboratory demonstration prototype consisting of two 3 kW machines, the technology represents applied and tested research that requires full-scale validation on commercial transit vehicles.
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In order to achieve faster speed tracking ability with lower thrust ripple for the linear induction machine (LIM), one robust speed control strategy using sliding mode direct thrust control (SM-DTC) is first proposed based on the space vector modulation (SVM) technique with the secondary flux-linkage orientation. Then, one improved maximum thrust per ampere technique is presented to further minimize the primary current and copper loss under the constant output thrust. Full comparison has been made among the proposed SM-DTC, the conventional DTC and field orientation control methods in different typical working states. Comprehensive simulation and experiments have been done on the basis of two 3 kW arc induction machines (as one demonstration prototype for the real LIM), which adequately confirm that the proposed method can successfully get faster dynamic response with lower thrust ripple.
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DOI: 10.1109/tpel.2020.3025184
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