Finite element analysis of electromagnetic relay under the impact of disturbing magnetic field

Wang, Rumeng; Yang, Yong; Zhang, Ming; Lu, Yiwei

doi:10.1016/j.fusengdes.2021.112344

Cited by 8 publications

(6 citation statements)

References 10 publications

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“…It is shown that the starting current increases with the strength of the SMF, and the starting current in the negative SMF is higher than that in the positive SMF. It indicates that the negative and positive SMFs have similar influence on the LEA, but the influence of the negative SMF is more significant, and the reason is explained in [9].…”

Section: Influence On Starting Current and Release Currentmentioning

confidence: 98%

“…Analysis shows that the additional electromagnetic force exerted by the SMF on the LEA varies with the SMF direction, and it increases as the angle between the SMF and the central axis of the LEA decreases [9]. This means that the SMF parallel to the LEA axis has the greatest effect on the LEA, thus only this case is analyzed in this paper.…”

Section: Influence On Driving Force and Equivalent Inductancementioning

confidence: 99%

“…Electromagnetic relays and contactors belong to linear electromagnetic actuators (LEAs), which also include solenoid valves [8][9][10]. LEAs are widely used in tokamaks and theuir peripheral equipment, such as solenoid valves in gas injection systems, contactors in power distribution systems, and electromagnetic relays in control systems.…”

Section: Introductionmentioning

confidence: 99%

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Dynamic performance of linear electromagnetic actuators in a stray magnetic field: theoretical analysis and experimental verification

Wang

Yang²,

Wang³

et al. 2022

Plasma Sci. Technol.

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Linear electromagnetic actuators (LEAs) are widely used in tokamaks, but they are extremely sensitive to and are prone to fail in high-strength stray magnetic field (SMF) which is usually a concomitant with tokamaks. In this paper, a multi-physics coupling analysis model of LEA including magnetic field, electric circuit and mechanical motion is proposed, and the dynamic characteristics of LEA in SMF are studied in detail based on the proposed model. The failure mechanism of LEA in SMF is revealed, and the influence of SMF on the dynamic performance of LEA is studied and quantified. It is shown that, the failure threshold of the LEA selected in this work under the rated condition is 27 mT and 14 mT in the positive and negative direction, respectively. Under a typical SMF of 10 mT in the negative direction, the closing time of the LEA will be extended 40%, while its opening time will be shortened about 10%. Experimental tests are also conducted, which verify the validity of the proposed model and the analysis results. This paper provides a basis for the diamagnetic optimization design of LEA, and it is of great significance to ensure the reliable operation of tokamak.

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Section: Influence On Starting Current and Release Currentmentioning

confidence: 98%

Section: Influence On Driving Force and Equivalent Inductancementioning

confidence: 99%

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Dynamic performance of linear electromagnetic actuators in a stray magnetic field: theoretical analysis and experimental verification

Wang

Yang²,

Wang³

et al. 2022

Plasma Sci. Technol.

Self Cite

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“…These two coordinate systems should be transformed into the same system before importing current density j( r , , z, t) profiles into the geometry model. The Cartesian and Cylindrical coordinates transformation principle is shown in equation (7). Plasma current Ip can be calculated using multiple integral j with ds, as shown in equation ( 8).…”

Section: Current Profile In Vdementioning

confidence: 99%

“…Plasma-Facing Components (PFCs) are faced magnificent electromagnetic (EM) loads during VDE disruption [1][2][3][4] , a significant event caused by the failure of magnetic field control [5][6][7] and the instability of the internal plasma excitation (magnetohydrodynamic, MHD perturbations [8][9] ). There are many reasons for the excitation of the disruptions, which are often accompanied by the increase of impurities density concentration in the core region (r/a=0) [10][11][12][13][14][15] , the increase of the E×B drift force [16][17][18] , the perturbation change of the plasma rotation velocity, and the turbulence caused by the instability of the magnetic fluids (MHD).…”

Section: Introductionmentioning

confidence: 99%

Prediction of Electromagnetic Loads for HL-2M Plasma Facing Components in Vertical Displacement Event

Chen

Liu

et al. 2022

Preprint

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Three-dimension (3-D) geometry models are established for HL-2M tokamak Plasma-Facing Components (PFCs), including Vacuum Vessel (VV) and divertor by ANSYS in this study. We predict Electromagnetic (EM) loads during an upwards Vertical Displacement Event (VDE) disruption by introducing plasma & magnetic field coils currents models. Eddy currents are induced due to the decay of plasma current and then flow into the PFCs components. The interaction between eddy currents and magnetic fields generates enormous EM forces and torques. During the VDE disruption, the halo currents are also born due to plasma currents moving to VV and divertor accompanied with dynamic evolution. Halo currents flow into VV and divertor inside components from the inner &outer target plate, the demo plate, and the cassette box. We found that the EM loads are most substantial on the radial& poloidal EM forces by introducing discretized spatiotemporal current profiles calculated from the DINA code. Inward & upward forces are the dominant factor in the VV and divertor. It may provide helpful experiences in designing China Fusion Engineering Test Reactor (CFETR).

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A simple modification to improve the immunity of linear electromagnetic actuators against disturbing magnetic field

Wang

Yang

et al. 2022

Journal of Magnetism and Magnetic Materials

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Finite element analysis of electromagnetic relay under the impact of disturbing magnetic field

Cited by 8 publications

References 10 publications

Dynamic performance of linear electromagnetic actuators in a stray magnetic field: theoretical analysis and experimental verification

Dynamic performance of linear electromagnetic actuators in a stray magnetic field: theoretical analysis and experimental verification

Prediction of Electromagnetic Loads for HL-2M Plasma Facing Components in Vertical Displacement Event

A simple modification to improve the immunity of linear electromagnetic actuators against disturbing magnetic field

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