Thrust and Levitation Coupling and Fluctuation Analysis of Linear Doubly-Fed Induction Motors With Variable Air-Gap

Zhong, Zaimin; Shao, Zhongshu; Ren, Ju; Li, Can; Yang, Minglei; Wang, Yeqin

doi:10.1109/jestie.2022.3152708

Cited by 5 publications

(7 citation statements)

References 31 publications

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“…L s is the stator self-inductance, L r is the mover self-inductance, and L m is the mutual inductance between stator and mover based on the single-phase. Based on the magnetic co-energy method in [21], the thrust and levitation forces of DFLM can be obtained as…”

Section: A Dflm Modelingmentioning

confidence: 99%

“…2) The coupling behaviors, e.g., the coupling of the electrical forces [21], and the coupling between the slip power and the propulsion power [17], [20], as well as the communication delay between stator side and the mover side [19], [20], increase the control challenges to achieve proper operation of the DFLM. 3) To the best of the authors' knowledge, the feasibility of the DFLM application in maglev train has never been systematically investigated.…”

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confidence: 99%

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Quasi-Synchronous Operation Principle of a Variable Air-Gap Doubly Fed Linear Motor for High-Speed Maglev Application

Zhong

Shao

Yang

et al. 2023

IEEE Trans. Transp. Electrific.

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Compared to a long-stator linear synchronous motor (LLSM), a long-stator doubly-fed linear motor (DFLM) exhibits two distinct advantages for high-speed maglev application: 1) It has two additional degrees of freedom with both the frequency and the phase angle of the mover to improve its control accuracy and dynamic responses; 2) It can use the slip power to feed the mover contactlessly and directly. In order to achieve the propulsion, the levitation, and the contactless power transfer through the common air-gap magnetic field, the "quasi-synchronous operation (QSO)" principle of the DFLM is proposed for highspeed maglev train. Based on the DFLM modeling and distinctive constraints for maglev train, the operation point analysis of the performance evaluation is further investigated. To validate the feasibility of the DFLM application for high-speed maglev train, a unit DFLM prototype is designed and tested, and the corresponding simulation studies of the QSO control structure are investigated.Index Terms-Doubly-fed linear motor (DFLM), quasisynchronous operation (QSO), high-speed maglev train, unit DFLM prototype, multiphase DFLM. I. INTRODUCTIONB Y replacing traditional wheels with electromagnets, a maglev (from magnetic levitation) train is able to achieve high-speed through both a contactless levitation system and a contact-free propulsion system, which has been proven to be a promising transportation system [1], [2]. For the maglev application, three basic functions of the propulsion, the levitation, and the contactless power transfer should be achieved through the design of the electric drive system [3], [4]. Currently, there are two main technical solutions for the high-speed maglev train, one is German Transrapid (TR) maglev train, the other is Japanese MLX maglev train [1], [4]. The electromagnetic suspension (EMS) technique is considered for the levitation by TR maglev system, while electrodynamic suspension (EDS) technique is used by MLX maglev system. Both of them adopt the long-stator linear synchronous motor (LLSM) for the propulsion. The electromagnets with iron-core are utilized by TR system, while the superconducting magnets with aircore are used by MLX system. Due to the combination of the EDS and the superconducting magnets, MLX system has relatively higher system cost and maintenance cost, and the superconducting magnets have stronger magnetic field and higher failure risks [1], [4].

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Section: A Dflm Modelingmentioning

confidence: 99%

mentioning

confidence: 99%

Quasi-Synchronous Operation Principle of a Variable Air-Gap Doubly Fed Linear Motor for High-Speed Maglev Application

Zhong

Shao

Yang

et al. 2023

IEEE Trans. Transp. Electrific.

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Section: Introductionmentioning

confidence: 99%

“…The DFLM has more control degree of freedoms to provide thrust force, normal force and contactless power transfer between the stator and the mover [3], [4]. The long-stator DFLM can be potentially applied to railway transports or magnetic levitation (maglev) systems [4]- [6]. For example, the longstator DFLM is investigated in a railway project, named "Neue Bahntechnik Paderborn" (NBP) [6], where a common primary stator is considered for the railway, and different movers are considered for different Railcabs to form convoys.…”

Section: Introductionmentioning

confidence: 99%

“…Similar to the DFIG [10], the slip power is coupled with traction power of the mover by the slip ratio for the DFLM. Both thrust force and normal force of the DFLM are intrinsically coupled, because they are achieved by a common traveling air-gap magnetic field [4]. Thirdly, in order to maintain the stable mechanical forces and contactless power though the common traveling air-gap magnetic field, the current vectors of both the stator and the mover should be synchronized in both time and space levels [11].…”

Section: Introductionmentioning

confidence: 99%

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Quasi-Synchronization Operation of a Long-Stator Doubly-Fed Linear Motor with Accurate Control of both Traction and Contactless Power Transfer

Wang¹,

Shao²,

Zhong³

et al. 2022

Preprint

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In this paper, a quasi-synchronization operation of a doubly-fed linear motor is proposed to achieve accurate regulation of both the traction 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 is 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.

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Estimation of the parameters for multi-cage models of induction motors using manufacturer data and PSO

Perin,

Pereira,

Silveira

et al. 2023

Electr Eng

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Thrust and Levitation Coupling and Fluctuation Analysis of Linear Doubly-Fed Induction Motors With Variable Air-Gap

Cited by 5 publications

References 31 publications

Quasi-Synchronous Operation Principle of a Variable Air-Gap Doubly Fed Linear Motor for High-Speed Maglev Application

Quasi-Synchronous Operation Principle of a Variable Air-Gap Doubly Fed Linear Motor for High-Speed Maglev Application

Quasi-Synchronization Operation of a Long-Stator Doubly-Fed Linear Motor with Accurate Control of both Traction and Contactless Power Transfer

Estimation of the parameters for multi-cage models of induction motors using manufacturer data and PSO

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