Detent Force Reduction in Permanent Magnet Linear Synchronous Motor Base on Magnetic Field Similarity Method

Liu, Chunyuan; Gao, H. Oliver; Xiong, Yi; Zhou, Suyang; Fu, Wei

doi:10.1109/access.2019.2913867

Cited by 13 publications

(10 citation statements)

References 24 publications

(18 reference statements)

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“…The calculated value of ( 13) and ( 14) bring into the equation ( 9), and get the value of heat transfer coefficient in the state of forced convention. Likewise, the heat transfer coefficient can be calculated by equation (15) to (17) and (9) in the state of natural convention. The heat transfer coefficients change greatly in the range of about 4-12 W/(m 2 •K) and 40-65 W/(m 2 •K) in the state of natural and forced convention [25].…”

Section: A Flux Densitymentioning

confidence: 99%

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Multi-Physical Coupling Field of a Permanent Magnet Linear Synchronous Generator for Wave Energy Conversion

et al. 2021

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Permanent Magnet Linear Synchronous Generators (PMLSG) has high power density and high efficiency, which is always employed in industrial application field. However, as temperature increases, it is easy to cause demagnetization of the permanent magnet, and the applications of PMLSG is limited. In this paper, a PMLSG is optimized which is used in a low speed power generation system. Firstly, a multi-physical coupling field system is described, and introduced the main factors which affecting the design of the PMLSM. Secondly, a multi-physics optimization method based on Genetic Algorithm (GA) is to improve the power density and efficiency. At the same time reduce the material cost of the generator. The thermal model is established and analysis the losses of PMLSG. The conductive heat transfer coefficient is calculated. Then, a Finite Element Analysis (FEA) model is established, and the electromagnetic properties of PMLSG were analyzed. The results of the electromagnetic field calculation are imported into the transient thermal analysis model by FEA, and the temperature of each part for PMLSG are calculated. Finally, an experimental test platform is built for verifying the correctness of the analysis.

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Section: A Flux Densitymentioning

confidence: 99%

“…Nowadays, there are many methods on PMLSG optimization [7][8] [9]. However, most methods are only optimized for only one or two parameters.…”

Section: Introductionmentioning

confidence: 99%

Multi-Physical Coupling Field of a Permanent Magnet Linear Synchronous Generator for Wave Energy Conversion

et al. 2021

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“…Similar to the rotating permanent magnet (PM) machine topologies, there is a broad range in PM placement and utilization in linear electrical machines as well. The linear electrical PM machines can be constructed with surface-mounted PMs [3][4][5], buried PMs (also called sandwich-mounted PMs) [6], or a Halbach array [7]. The PMs are often placed on the moving translator but can also be placed on the stator to utilize the magnetic gearing effect in a linear Vernier hybrid machine for both surface-mounted [8] and buried (in this case V-shaped) [9] PMs.…”

Section: Introductionmentioning

confidence: 99%

“…End forces of linear machines and ways of reducing these forces have been investigated in earlier studies. One study approximates the flux distribution to a reluctance model through a magnetic field similarity method and investigates end-teeth variations to counter the end forces under no-load, derived through virtual work [3]. One study separates the stator block into sections with two phases in each block to counter the end forces [14].…”

Section: Introductionmentioning

confidence: 99%

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End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

Sjölund

Frost

Leijon

et al. 2021

Designs

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Electricity production from ocean waves with different solutions is a topic of major research interest. Many of such designs are based on linear generators that inherently introduce end forces. In this paper, detent force using Maxwell Stress Tensor and induced voltage is initially investigated for two different winding patterns for a generator topology with buried magnets in a finite element software. Two ways of overcoming the end forces are further examined: the first method reduces the magnetic flux variations of the translator between stator and air. The second method aims at countering the end forces at both ends for full active stator area. A comparison is then made between buried and surface-mounted topologies for the second end effect compensation method. Both no-load and load conditions are investigated in the comparison. The end effect compensation shows promising results for both topologies. Some clear similarities of the extended stator used to counter the end forces are also apparent, where the stator extensions completely cover the outer poles of both topologies. The results also indicate a longer full active stator area for the buried topology for the same pole-pitch and stroke length, resulting in a higher average voltage for partial stator overlap.

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Study on Performance Parameters of Short-Secondary Type Slotless Permanent Magnet Linear Synchronous Motor Based on Analytic Method

Hao

Yin

2021

J. Electr. Eng. Technol.

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This paper mainly studies two-dimensional analytic method to analyze and calculate a short-secondary type slotless permanent magnet linear synchronous motor (SST-SPMLSM) performance. Due to the large air-gap and more magnetic flux leakage of electric machine, this paper proposes the groove-by-groove method to analyze the winding equivalent current density. Meanwhile, the volume current density is used to equivalent the permanent magnet magnetization, which is obtained the permanent magnet equivalent current density. According to the electric machine structure, the divided layers model of the SST-SPMLSM is built. Based on the hierarchical analytical model and equivalent current density of the electric machine, the two-dimensional magnetic vector potential of each region in the SST-SPMLSM is derived by the separated variable method. Combined with the boundary conditions of the electric machine, the magnetic flux densities of the SST-SPMLSM with different regions are derived. In the meantime, a 30 N SST-SPMLSM is designed. On this basis, the magnetic flux density, detent force, and electromagnetic thrust force of the SST-SPMLSM are analyzed and calculated, which of the results are verified by finite element method. From the results, it satisfies the design requirements of the SST-SPMLSM, and verifies the validity and correctness of analytical method.

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Detent Force Reduction in Permanent Magnet Linear Synchronous Motor Base on Magnetic Field Similarity Method

Cited by 13 publications

References 24 publications

Multi-Physical Coupling Field of a Permanent Magnet Linear Synchronous Generator for Wave Energy Conversion

Multi-Physical Coupling Field of a Permanent Magnet Linear Synchronous Generator for Wave Energy Conversion

End Effects and Geometric Compensation in Linear Permanent Magnet Synchronous Generators with Different Topologies

Study on Performance Parameters of Short-Secondary Type Slotless Permanent Magnet Linear Synchronous Motor Based on Analytic Method

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