Quasi-Synchronous Operation of a Long-Stator Doubly Fed Linear Motor With Accurate Control of Both Propulsion and Contactless Power Transfer

In this article, a quasi-synchronous operation (QSO) of a doubly fed linear motor (DFLM) is proposed to achieve accurate regulation of both the propulsion and the contactless power transfer. A new control structure is proposed to achieve the loose coupling control between the stator side and the mover side, where the scalar control is used for the stator side controller (SSC), and the field-oriented control (FOC) is adopted for the mover side controller (MSC). The SSC and the MSC are with “frequency coupling,” which enhances the reliability of the whole control system with less information exchange between the SSC and the MSC. The effectiveness of the proposed design is validated through both simulation and experimental studies.