Modeling of a Complementary and Modular Linear Flux-Switching Permanent Magnet Motor for Urban Rail Transit Applications

Cao, Ruiwu; Cheng, Ming; Mi, Chris; Wang, Hua; Wang, Xin; Zhao, Wenxiang

doi:10.1109/tec.2012.2190985

Cited by 133 publications

(61 citation statements)

References 17 publications

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“…Here, the results indicated that the three-phase no-load back-EMF magnitudes were unbalanced for both machines due to the unbalanced magnetic circuit in the end coil. Due to the same flux-switching concept as that of the conventional LFSPM machines, the output thrust force of the two C-core LFSPM machines under d-q axes can be expressed as [13]:…”

Section: Thrust Force Comparisonmentioning

confidence: 99%

Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability

Hao

Wang

2017

Energies

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Linear flux-switching permanent magnetic (LFSPM) machines are good choices for long stroke applications. These machines deliver high thrust force density in addition to the machine structure where permanent magnetics (PMs) and windings are all on the short mover. For LFSPM machines, their performance is always affected by big thrust force ripple. In this paper, for two C-core LFSPM machines of high thrust force capability, including a 6/13 C-core LFSPM (6/13LFSPM-C) machine and a sandwiched C-core LFSPM (SLFSPM-C) machine, and a thrust force ripple reduction method is proposed. The proposed method is developed by reducing the slot effect component of the cogging force based on staggered stator tooth, and suppressing the thrust force ripple caused by unbalanced three phase back-electromagnetic forces (EMFs) based on two end PMs. Based on finite element analysis (FEA) results, both C-core LFSPM machines can achieve small thrust force ripples as well as high sinusoidal back-EMFs, and at the same time, maintain high thrust force capability with the proposed method. It was also found that, the improved SLFSPM-C machine exhibited the same thrust force capability as the improved 6/13LFSPM-C machine, but with a much smaller thrust force ripple.

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Section: Thrust Force Comparisonmentioning

confidence: 99%

Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability

Hao

Wang

2017

Energies

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“…The linear PMFS machines as shown in Figure 12 inherit the merits of the rotary PMFS machines, and are particularly attractive for long-stroke applications, for example, wave energy extraction application (21) and urban rail transit (22), because both magnets and coils are mounted on the short mover so that the problems of excessive use of permanent magnets or copper in the conventional longstroke linear PM machines can be eliminated. In addition to the conventional radial-flux PMFS machines, the axialfield PMFS machines are also proposed for the wind power applications (23), as shown in Figure 13.…”

Section: Linear Axial-flux and Transverse-flux Pmfs Machinesmentioning

confidence: 99%

Flux‐Switching Machines

Wang

Zhang

et al. 2015

Wiley Encyclopedia of Electrical and Electronics Engineering

Self Cite

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Flux‐switching machines are a type of brushless machines with a doubly salient structure, which has excitation sources, for example, permanent magnets (PMs) and/or field‐excited windings, and armature windings on the stator, and no magnets or windings on the rotor. The flux‐switching machines have the advantages of high torque (power) density, large torque output capability, high efficiency, strong irreversible demagnetization withstand capability, good thermal dissipation and liquid cooling conditions, and favorable high‐speed operation. These advantages are particularly important for electric propulsion systems, such as electric vehicles and hybrid electric vehicles, and electric ships and airplanes. According to the excitation modes, there are three types of flux‐switching machines: permanent magnet flux‐switching (PMFS) machines, hybrid‐excited flux‐switching (HEFS) machines, and wound‐excited flux‐switching (WEFS) machines. This article presents topologies, operation principles, electromagnetic performance, and applications of flux‐switching machines. In addition, different topologies of stator and rotor are also discussed.

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“…In order to obtain the symmetrical 3-phase flux linkage and no-load EMF, a complementary and modular E-core LFSPM machine is proposed for urban rail transit and the corresponding mathematical model is established [21].…”

Section: Introductionmentioning

confidence: 99%

Detent Force Reduction of a C-Core Linear Flux-Switching Permanent Magnet Machine with Multiple Additional Teeth

Yang

Quan

et al. 2017

Energies

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C-core linear flux-switching permanent magnet (PM) machines (LFSPMs) are attracting more and more attention due to their advantages of simplicity and robustness of the secondary side, high power density and high torque density, in which both PMs and armature windings are housed in the primary side. The primary salient tooth wound with a concentrated winding consists of C-shaped iron core segments between which PMs are sandwiched and the magnetization directions of these PMs are adjacent and alternant in the horizontal direction. On the other hand, the secondary side is composed of a simple iron core with salient teeth so that it is very suitable for long stroke applications. However, the detent force of the C-core LFSPM machine is relatively high and the magnetic circuit is unbalanced due to the end effect. Thus, a new multiple additional tooth which consists of an active and a traditional passive additional tooth, is employed at each end side of the primary in this paper, so that the asymmetry due to end effect can be depressed and the detent force can be reduced by adjusting the passive additional tooth position. By using the finite element method, the characteristics and performances of the proposed machine are analyzed and verified.

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Modeling of a Complementary and Modular Linear Flux-Switching Permanent Magnet Motor for Urban Rail Transit Applications

Cited by 133 publications

References 17 publications

Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability

Thrust Force Ripple Reduction of Two C-Core Linear Flux-Switching Permanent Magnet Machines of High Thrust Force Capability

Flux‐Switching Machines

Detent Force Reduction of a C-Core Linear Flux-Switching Permanent Magnet Machine with Multiple Additional Teeth

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