Development of a new voltage quality improving method for electromagnetic contactor

Chi, Chieh-Tsung

doi:10.3233/jae-2009-1060

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…6 b and d , in which d t is the time difference and L is the variations of the linkage flux λ according to the current change. When the mover is in motion, (1) should be modified into (2) because the linkage flux λ is varied by both the change of current and the motion of mover [19–22]. The variations of the linkage flux λ according to the motion of the mover is marked as λ x and (2) can be modified as (3), in which the second and third terms of the right side are the back electro‐motive force (EMF) by the current and the motion of the mover, respectively

V_{C} = I R_{coil} + L \frac{normald I}{normald t}

\begin{matrix} right leftthickmathspace.5em \\ V_{normalC} & = I R_{coil} + \frac{d λ (I, x)}{d t} \\ = I R_{coil} + \frac{\partial λ (I, x)}{\partial I} \frac{normald I}{normald t} + \frac{\partial λ (I, x)}{\partial x} \frac{normald x}{normald t} \end{matrix}

V_{C} = I R_{coil} + L \frac{normald I}{normald t} + λ_{x} \frac{d x}{d t}

…”

Section: Analysis Methods For the Lamentioning

confidence: 99%

Characteristic analysis and design of a novel lorentz force driving actuator for a molded case circuit breaker

Bak

Jung

2015

IET Electric Power Applications

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Recently, the demand for a remote controllable actuator for a circuit breaker (CB) has increased because of the trend towards the automation and information technology (IT) of the power system. However, the conventional molded case CB (MCCB) -of which demand is high among CBs -is not only manually controlled, but also liable to breakdown and difficult to find broken components because of the use of the mechanical spring type actuator. To address these problems, a novel Lorentz force driving actuator (LA) is proposed in this research. The LA is suitable for both low-and high-power CBs because of its high power density and the unaffectedness of performance by the stroke. The MCCB equipped with the LA is the first remote controllable low-power CB and low in maintenance cost. The correct and rapid analysis and design method using a twodimensional magneto-static field analysis and a dynamic analysis is proposed for the small size actuator as LA in this research.

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V_{C} = I R_{coil} + L \frac{normald I}{normald t}

\begin{matrix} right leftthickmathspace.5em \\ V_{normalC} & = I R_{coil} + \frac{d λ (I, x)}{d t} \\ = I R_{coil} + \frac{\partial λ (I, x)}{\partial I} \frac{normald I}{normald t} + \frac{\partial λ (I, x)}{\partial x} \frac{normald x}{normald t} \end{matrix}

V_{C} = I R_{coil} + L \frac{normald I}{normald t} + λ_{x} \frac{d x}{d t}

…”

Section: Analysis Methods For the Lamentioning

confidence: 99%

Characteristic analysis and design of a novel lorentz force driving actuator for a molded case circuit breaker

Bak

Jung

2015

IET Electric Power Applications

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“…Mechanical bounces can be induced if too large force is applied. Lots of researches have been conducted to study the ways of reducing this undesirable phenomenon [1][2][3]. A current closed-loop controller is used in [1] to eliminating the contact bounce in DC core contactors.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear magnetic field analysis for 3D electromagnetic contactors

Shu

Zhu

et al. 2013

JAE

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A new approach considering the nonlinearity of the electric core is proposed to analyze the magnetic field and magnetic force of 3D electromagnetic contactors. The nonlinear constitutive law is established by measuring the B-H curve of the core experimentally. Finite element method is used to model the electromagnetic responses of the system, in which the 3D Ampère's circuital law is implemented in PDE weak form. In order to analyze the nonlinear responses of the magnetic field and magnetic force, the measured constitutive law is incorporated with the weak form equation by numerical interpolation. Both the static and transient responses of the electromagnetic system are studied by solving the coupled weak form equations step by step. Experimental results show that the proposed model has good predictions of the magnetic force. The saturation due to the nonlinearity of the B-H curve can be described as well. This modeling framework offers an advantage to solve the nonlinear responses of 3D electromagnetic systems without theoretical modeling the complex constitutive law of the electric core.

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Development of a new voltage quality improving method for electromagnetic contactor

Cited by 2 publications

References 15 publications

Characteristic analysis and design of a novel lorentz force driving actuator for a molded case circuit breaker

Characteristic analysis and design of a novel lorentz force driving actuator for a molded case circuit breaker

Nonlinear magnetic field analysis for 3D electromagnetic contactors

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