Research on Noninteger Pole Number for Segmental Permanent Magnet Linear Synchronous Motor

Tan, Qiang; Wang, Mingyi; Li, Junchi

doi:10.1109/tie.2020.2985001

Cited by 16 publications

(9 citation statements)

References 23 publications

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“…According to [20], the thrust force of the machine composed of the electromagnetic force Fem and detent force Fdet, the electromagnetic force can be calculated by following equation,…”

Section: A Thrust Ripple Analysis Of Module Arrangementmentioning

confidence: 99%

“…4, there are two end forces for each module, and the end force for ith module, 𝐹 _ , can be calculated by combining those two end forces together. (20) calculated the n3th order harmonics for 𝐹 _ ,  …”

Section: B Fractional Pole-pair Unequal Module Arrangement Formentioning

confidence: 99%

“…However, this method could only eliminate the fundamental and other order harmonics in the detent force except for third-and three-times' order harmonics. To further eliminate the remaining harmonics, fractional primary mover has been proposed in [19] [20], and the higher order harmonics in the induced voltage and detent force have been perfectly eliminated. It is found that most of the existing work focused on the conventional PMLSM, which is not suitable for the long-stroke application.…”

Section: Introductionmentioning

confidence: 99%

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Force Ripple Reduction of a Fractional Pole Pair Complementary Modularized Variable Reluctance Linear Machine for Long Stroke Application

Li¹,

Niu²,

Zhao³

et al. 2023

IEEE Trans. Transp. Electrific.

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Variable reluctance linear machine (VRLM), which takes advantages of magnet free, simple structure and low cost, is one of the emerging candidates for long stroke application. However, due to the abundant harmonics in the air gap, the conventional modular linear machine suffered from thrust ripple which leads to vibration and acoustic noise problem. The thrust force ripple in VRLM is mainly caused by higher-order harmonics in the induced voltage and detent force. To furtherly suppress the oddorder harmonics in the induced voltage and detent force, a fractional pole-pair unequal module arrangement (FP-UMA) design, in which the distances of adjacent modularized mover segments are not equal, is proposed to VRLM and collaborated with complementary structure in this paper. The key is that the modularized movers are artificially designed to be unequally distributed regarding to spatial distribution to eliminate the odd-order harmonics in the induced voltage along with the thrust ripples they caused based on the quantitative analysis on the thrust ripple components. It is revealed that, with the proposed FP-UMA design, the thrust ripple ratio of the machine has been effectively relieved from 4.6% to 2.2% under copper loss of 450W. Further, some design guidelines for the proposed machine, such as position offset of modularized mover m2, DC loss ratio kdc and slot pole combinations are discussed. In addition, the feasibility of the proposed design method is evaluated by finite element method as well as experiments.

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“…According to [20], the thrust force of the machine composed of the electromagnetic force Fem and detent force Fdet, the electromagnetic force can be calculated by following equation,…”

Section: A Thrust Ripple Analysis Of Module Arrangementmentioning

confidence: 99%

Section: B Fractional Pole-pair Unequal Module Arrangement Formentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Force Ripple Reduction of a Fractional Pole Pair Complementary Modularized Variable Reluctance Linear Machine for Long Stroke Application

Li¹,

Niu²,

Zhao³

et al. 2023

IEEE Trans. Transp. Electrific.

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show abstract

“…In recent years, with the development of rare earth permanent magnet materials, the permanent magnet (PM) machines are more and more widely used in aerospace, wind turbines, new energy vehicles and other fields [1][2][3][4]. However, due to the fixed magnetic potential source of PM machines, which limits the use of the machines in a wider speed range operation.…”

Section: Introductionmentioning

confidence: 99%

A method of reducing the cogging torque in a flux-torque regulation hybrid excitation machine with axial-radial magnetic circuit

Qiu,

Duan,

Yang

2023

Preprint

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In order to solve the problem of insufficient torque for flux weakening in permanent magnet machines, a novel flux-torque regulation hybrid excitation machine with axial-radial magnetic circuit (FTRHEM) is proposed. To solve the problem that the cogging torque of the proposed machine is caused by multiple factors and the coupling relationship is complicated, an analytical expression for the cogging torque is derived first. Then, the influence of the axial excitation device on the cogging torque is determined. The influence mechanism of the relative positions between the axial excitation device and stator on the cogging torque is revealed. A dislocation method is proposed to reduce the cogging torque, and its effectiveness is verified by the finite element analysis (FEA). Furthermore, the reduction of the cogging torque in FTRHEM with different pole-slot combinations by this method is comprised and analyzed, which demonstrates the feasibility of the method. Finally, the FEA results are combined with experiments to verify the accuracy of simulations.

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“…Recently, a modular technology scheme was put forward and implemented in various machines to reduce the detent force [17][18][19][20][21]. In [17], each slot of the machine was dispersed, and the detent force was greatly reduced by the mutual influence between the single primary units.…”

Section: Introductionmentioning

confidence: 99%

Sectional Modular Technology for Reducing Detent Force of Linear Unit in Linear-rotary Flux-switching Permanent-magnet Generator for Wind-wave Combined Energy Conversion

Zhang,

Nie,

et al. 2023

ACES Journal

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A linear-rotary flux-switching permanent magnet (FSPM) generator (LRFSPMG) is a potential candidate for a wind-wave combined energy conversion (WWCEC) system. The linear unit of the LRFSPMG is a tubular FSPM linear generator (TFSPMLG), which like other permanent magnet linear generators, has an inherent detent force problem. To alleviate this problem, a sectional modular technology scheme is investigated to reduce the detent force of the TFSPMLG. Firstly, the structure is briefly introduced and the detent force analyzed. Secondly, the sectional modular TFSPMLGs are presented and their feasibility verified with respect to the stator of the TFSPMLG being split into two and three sections, forming Modulars I and II, respectively. After that, the detent force suppression principle, and the effects that the sectional modular structures exert on the detent force are analyzed. According to the analysis results, two methods are presented to suppress the detent force: one is to suppress the magnetic coupling effect; the other is to reduce the remaining harmonics. Finally, the three TFSPMLGs, including the initial TFSPMLG, Modular I, and Modular II, are comparatively analyzed by finite-element analysis (FEA). The results show that both the detent forces are greatly reduced without sacrificing the back electromotive force (EMF) and average electromagnetic force, thereby proving the effectiveness of the TFSPMLG with a sectional modular structure.

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Research on Noninteger Pole Number for Segmental Permanent Magnet Linear Synchronous Motor

Cited by 16 publications

References 23 publications

Force Ripple Reduction of a Fractional Pole Pair Complementary Modularized Variable Reluctance Linear Machine for Long Stroke Application

Force Ripple Reduction of a Fractional Pole Pair Complementary Modularized Variable Reluctance Linear Machine for Long Stroke Application

A method of reducing the cogging torque in a flux-torque regulation hybrid excitation machine with axial-radial magnetic circuit

Sectional Modular Technology for Reducing Detent Force of Linear Unit in Linear-rotary Flux-switching Permanent-magnet Generator for Wind-wave Combined Energy Conversion

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