Cogging Force Optimization of Double-Sided Tubular Linear Machine With Tooth-Cutting

Liang, Guoxian; Zhang, Qi; Galea, Michael; Lü, Wei

doi:10.1109/tie.2021.3101017

Cited by 11 publications

(4 citation statements)

References 25 publications

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“…The energy conservation law reflects the heat exchange of fluid system. Mass conservation law and energy conservation law are, respectively, shown in Equations ( 5) and (6), where the fluid density is ρ, exercise time is t, u v w are the flow velocity components in the x y z direction, respectively, and where c p is the specific heat capacity, T f is fluid temperature, k is the heat transfer coefficient of fluid, and S T is the internal heat source of fluid. In the DSTLM, the velocity-inlet boundary conditions and the outflow boundary conditions are used for the inlet and outlet of the motor fluid field, respectively.…”

Section: Modelling Theory Of the Multi-physics Methodsmentioning

confidence: 99%

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Multi‐physics analysis of double‐sided tubular linear machine with misalignment faults

Liang

Liu

Galea

2022

IET Electric Power Appl

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Multi air-gap tubular linear machines usually take the form of a double-sided tubular linear machine (DSTLM). Such machines have a higher space utilisation and higher power density than their single air-gap counterparts, but at the same time the structure is more complex. It is traditionally very difficult to mechanically implement a movement between two slotted stators, whilst maintaining an even air gap distribution. Thermally, the inner stator is another complex aspect of a DSTLM. However, very little understanding of these two aspects and how they influence the performances of tubular machines exists today. Therefore in this paper, the aim is to accurately analyse the influence of temperature rise and eccentricity fault on the performances of DSTLM. A two-way electromagnetic-fluidthermal multi-physics coupling model of the DSTLM is established. The variations of electromagnetic, fluid and thermal characteristics with the eccentricity are systematically analysed. A physical prototype is manufactured and the analysed results are verified by the experiments.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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Section: Modelling Theory Of the Multi-physics Methodsmentioning

confidence: 99%

“…Its excellent electromagnetic performance is shown through electromagnetic analyses in Refs. [4][5][6]. However, the complexity associated with the mechanical structure of such has always been a disadvantage.…”

Section: Introductionmentioning

confidence: 99%

Multi‐physics analysis of double‐sided tubular linear machine with misalignment faults

Liang

Liu

Galea

2022

IET Electric Power Appl

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“…An elevator mainly consists of lifting and guiding systems. Conventional elevators use ropes to lift the elevator cabin in the vertical direction and use rollers to guide the cabin in the horizontal direction [1], [2]. Therefore, in conventional elevators, physical contact always occurs, so the ride quality is significantly deteriorated, especially in high-speed operation, and wear and dust are consistently generated.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Levitation Guiding System of a Ropeless Elevator for Semiconductor Wafer Vertical Transport: Experimental Evaluation

Ha,

Jung,

Park

et al. 2024

IEEE Access

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A novel design of a magnetic levitation (maglev) ropeless elevator for semiconductor wafer vertical transport is newly presented. To satisfy high cleanliness during vertical transport of the wafer, linear motor lifting and maglev guiding are desirable instead of the conventional rope lifting and wheel-based guiding method. Owing to the physically noncontact maglev guiding, particle-free and high-speed operation can be achieved with remarkable ride quality. In this paper, practical challenges for wafer transport, such as the eccentricity of the mass center from the actuating axis, severe acceleration/deceleration conditions as well as periodic large disturbances from normal forces of the linear motor, resonance of the elevator, and manufacturing tolerance of the guide rail, are further considered to satisfy the ride performance in wafer transport by designing a robust feedback controller with a loop shaping technique. A full-scale maglev ropeless elevator was constructed to experimentally validate the effectiveness of the proposed method. The experimental results demonstrated excellent magnetic levitation guiding performance in 5 degrees of freedom, with a maximum airgap fluctuation of 227 µm under harsh lifting conditions (V max = 2600 mm/s).

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“…Also, PM dividing and PM skewing are presented in [14,15]. Moreover, slots shaping and skewing [16,17], PM segmentation [30], selecting the optimum machine parameters [18][19][20][21], auxiliary poles utilizing [22], and pole shifting [23] are proposed to decrease the teeth cogging force.…”

Section: Introductionmentioning

confidence: 99%

Force Ripple Reduction Methods for Tubular Permanent Magnet Linear Machines

Ashouri-Zadeh,

Nasiri-Gheidari

2023

Scientia Iranica

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This paper presents some novel force ripple reducing techniques for tubular permanentmagnet linear machines (TPMLMs) with the square-shaped cross section. These methods are very straightforward, so their implementation in TPMLMs with the square cross section is easy. An analytical form of machine parameters such as the thrust force is obtained by solving the analytical field. A modular configuration for permanent-magnet pole is used to reduce teeth cogging force. Furthermore, the manufacturing cost of TPMLMs can be reduced by using modular pole permanent-magnet. In this method, the width of permanent-magnets (PMs) is calculated by using Fourier analysis and a sensitivity analysis has been conducted to identify the robustness of this technique. Additional stator side methods are used to decrease the end face cogging force. Moreover, the stator teeth shifting method is proposed to reduce the electromagnetic force ripples. Also, the produced electromagnetic force of the machine is increased by using a delay in the power supply. 3 − D non-linear finite-element analyses and experimental tests are performed to investigate the effectiveness and performance of proposed techniques.

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Cogging Force Optimization of Double-Sided Tubular Linear Machine With Tooth-Cutting

Cited by 11 publications

References 25 publications

Multi‐physics analysis of double‐sided tubular linear machine with misalignment faults

Multi‐physics analysis of double‐sided tubular linear machine with misalignment faults

Magnetic Levitation Guiding System of a Ropeless Elevator for Semiconductor Wafer Vertical Transport: Experimental Evaluation

Force Ripple Reduction Methods for Tubular Permanent Magnet Linear Machines

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