Contact bounce simulation using Matlab

Nouri, Hassan; Larsen, N.; Davies, T.S.

doi:10.1109/holm.1997.638054

Cited by 19 publications

(11 citation statements)

References 2 publications

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“…HFMEC takes leakage and fringing flux paths into account and also includes magnetic saturation by derivation of analytical expressions. A similar work that included nonlinearity of the iron core and fringing flux effects was proposed in [18] a Correspondence to: Trin Saengsuwan. E-mail: fengtss@ku.ac.th Engineering Faculty, Kasetsart University, Bangkok, 10900, Thailand In this paper, we therefore propose a new simulation approach of an AC electromagnetic contactor based on EMTP, which can be effectively employed in power system and power quality analysis.…”

Section: Introductionmentioning

confidence: 96%

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An improved AC electromagnetic contactor model based on EMTP

Saengsuwan

2017

IEEJ Transactions Elec Engng

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This paper presents a new simulation approach of an AC electromagnetic contactor based on the Electromagnetic Transient Program (EMTP). To decouple the simulation from the magnetic circuit, the duality transformation technique is applied to transform the magnetic model into an electrical model. With this technique, the solutions of the proposed model are only on electric circuit, and model can interface directly with the surrounding components in EMTP. To enhance the model precision, both saturation and fringing flux effects are taken into account. Additionally, the estimation of general unknown parameters, namely shading ring resistance and load force, is proposed. The performance and accuracy of the proposed model are verified by comparing with finite element method (FEM) results and experiments. Finally, the model is applied for the case study of the sensitivity of a contactor during voltage sag. The results demonstrate good performance of the proposed model, and the approach can be further extended to other electromagnetic devices.

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Section: Introductionmentioning

confidence: 96%

“…The design of a contactor was introduced in [15]. The authors in [16][17][18] succeeded in simulating the contact bounce phenomenon. The effects of voltage sag on AC contactors were investigated by simulation presented in [19][20][21], and an AC relay was analyzed in [22,23].…”

Section: Introductionmentioning

confidence: 99%

An improved AC electromagnetic contactor model based on EMTP

Saengsuwan

2017

IEEJ Transactions Elec Engng

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“…The kinetic energy of armature is controlled by timing coil energizing periods. In addition, other similar works were done as well [6], [11]. For an ac electromagnetic contactor, Li et al [8] showed that the moving velocity of armature is profoundly affected by different initial phase angles during closing process.…”

Section: Introductionmentioning

confidence: 95%

Energy distribution analysis in the closing process of contactor

Yin

Chi

2009

2009 IEEE Power &Amp; Energy Society General Meeting

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This paper aims at studying the energy distribution in each subsystem during the closing process based on the equivalent electrical and mechanical models of contactor. On one hand, the more dynamic behaviors are related to contactor can be obtained; on the other hand, the end result is helpful to improve the performance of contactor. Based on easy modeling and high calculating efficiency, the magnetic circuit analysis method is adopted as the establishing approach of contactor model. The simulation model of contactor is implemented by using Matlab/Simulink software tool. The simulation results showed that the energy distribution in each subsystem critically depends on the initial phase angle of ac voltage source. If the contactor is supplied to some ac voltage source at a specified initial voltage phase angle, the moving velocity or kinetic energy of movable contact prior to collision is allowed to be effectively controlled. Therefore, the rebounding time of contacts after the first time close with fixed contact can then be reduced greatly.

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“…The distributed magnetometive force of each segment is replaced by its centralized magnetometive force, the distributed leakage magnetic flux of each segment is replaced by its normalized leakage magnetic flux. In Figure 7, which is the equivalent magnetic circuit of the twin-E electromagnetic mechanism of AC contactor, the iN′, iN δ and IN″ represent separately the magnetometive forces distributed in the moving iron segment, the air-gap segment and the static iron segment, Z′ 1 and Z″ 1 .representing the reluctances of the center cylinder-shaped parts of the moving iron and static iron separately, Z′ 2 and Z″ 2 representing the reluctances of the cylinder-shaped parts of the irons at the bottom and the top separately, Z′ 3 and Z″ 3 representing the reluctances of the side cylinders of the moving and static irons separately, R′ y and R″ 3 being the normalized leakage magnetic fluxes of the moving iron and the static iron, R δ representing the reluctance of the center magnetic iron work gap, R δ1 an R δ2 representing the reluctances of the work gaps inside or outside of the flux-splitting ring mounted on the side iron cylinder, i s representing the induced current through the flux-splitting ring, N s representing the number of the flux-splitting ring turns taken as 1 in this paper, and 0, The equivalent electromagnetic circuit shown in Figure 7 is geometrical symmetrical, it can be simplified further. Then the computer software (omitted in this paper) is programmed to calculate iteratively.…”

Section: Dynamic Characteristic Calculating By the Magnetic Circuimentioning

confidence: 99%

“…Contact bounce during the closing operation for such loads can be troublesome, note only with regard to contact erosion and electromagnetic interference (EMI) [1], which can lead to problem with electronic control circuit. A number of studies of contact bounce have been published and methods [2] [3] of improving the performance of switching device during closing have been suggested. These include analysis and improvement of the electromechanical features of switching devices, selection and performance testing of contact materials and development of electronic controllers to control the motion of the contact assembly [4].…”

Section: Introductionmentioning

confidence: 99%

AC contactor making speed measuring and theoretical analysis

Lü

Hui

et al.

Proceedings of the 50th IEEE Holm Conference on Electrical Contacts and the 22nd International Conference on Electrical Contact

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Three-phase alternating current contactors (abbreviated AC contactor) are electrical devices which are applied to many fields in large quantities. It is important to improve their life and reliability. Reduction of contact bounce of AC contactor is the key problem to increase its life and reliability.The test of measuring the making speed of contacts and iron cores of AC contactor has been performed. The samples are CJ20-25 model of AC contactor, and the applied voltage for measuring is 380V during the experiments. The full closing processes of AC contactor were measured at different closing phases of the coil voltage. The test results show that making speeds of the moving contact and iron core varies with the closing phase of the coil voltage. And for the CJ20-25, there is a closing phase (about 75 degree) where the making speed of the iron core is the lowest in the range of [0-π]. In order to determine the best making phase to reduce the bounce speed of iron core as small as possible, the dynamic closing process of the AC contactor is analyzed theoretically by combining advantages of the two methods of "Electromagnetic Field" and "Magnetic circuit", and the calculated results are in good agreement with the test results.Keywords: AC contactor, closing phase, bounce of contact, bounce of iron core, dynamic process, electromagnetic-field method, magnetic-circuit method I.

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Contact bounce simulation using Matlab

Cited by 19 publications

References 2 publications

An improved AC electromagnetic contactor model based on EMTP

An improved AC electromagnetic contactor model based on EMTP

Energy distribution analysis in the closing process of contactor

AC contactor making speed measuring and theoretical analysis

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