Output Power Prediction Method of GEO Satellite Solar Array Based-on the Modified Equivalent Circuit Model

The vibration-threshold-triggered piezoelectric energy harvester is a new type of piezoelectric energy harvester with a two-stage structure, which can generate electricity in a low frequency environment and recognize vibration intensity at the same time. In this study, a theoretical model of a vibration-threshold-triggered energy harvester was examined, and an equivalent circuit model of the energy harvester was obtained. Then, an interface circuit was proposed that can significantly improve the output power of the energy harvester. The interface circuit achieved impedance matching with the piezoelectric material to maximize the energy collected from the energy harvester. First, we calculated and analyzed the impedance characteristics of the energy harvester, based on the equivalent circuit model. It was found that because the piezoelectric material is in resonance as the energy harvester is in operation, the corresponding impedance is almost resistance. Therefore, a resistance-matching strategy was proposed. Last, we proposed an interface circuit with adjustable input impedance to achieve resistance matching. The experimental results show that the proposed interface circuit can increase the output power of the energy harvester by 48.1–55.7% over that achieved with the standard interface circuit.

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Investigation of Output Power and Efficiency of Wound-Rotor Brushless Doubly-Fed Machine

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.516-517.1604 ◽

2012 ◽

Vol 516-517 ◽

pp. 1604-1609

Author(s):

Jun Zhang ◽

Xue Fan Wang

Keyword(s):

Equivalent Circuit ◽

Output Power ◽

Power Distribution ◽

Equivalent Circuit Model ◽

Circuit Model ◽

Maximum Output ◽

The Core ◽

Doubly Fed ◽

Doubly Fed Machine ◽

The Relationship

Brushless Doubly-fed Machine (BDFM) is a new type of the induction machine, which has wide application in the fields of variable-speed generator and drive systems. The key factor affecting its performance is the rotor structure. In this paper, taking wound-rotor BDFM for instance, firstly, according to the relationship between the equivalent circuit parameters of the BDFM, the core equivalent circuit model of the BDFM has been derived. Secondly, based on the core equivalent circuit model and the constraints of electromagnetic load, the power distribution between the power and control windings and the constraint condition of maximum output of active power has been obtained. Thirdly, according to the simplified model of the equivalent circuit, the copper loss and the relationship between the output power and efficiency of the machine have been investigated. Finally, the anlysis results are verified by the experimental data.

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Equivalent Circuit Model for Electric Double Layer Capacitors and its Applications

IEEJ Transactions on Power and Energy ◽

10.1541/ieejpes.131.524 ◽

2011 ◽

Vol 131 (6) ◽

pp. 524-529

Author(s):

Susumu Yamashiro ◽

Koichi Nakamura

Keyword(s):

Equivalent Circuit ◽

Double Layer ◽

Electric Double Layer ◽

Equivalent Circuit Model ◽

Circuit Model ◽

Double Layer Capacitors ◽

Electric Double Layer Capacitors

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An Equivalent Circuit Model for Vertical Comb Drive MEMS Optical Scanner Controlled by Pulse Width Modulation

IEEJ Transactions on Sensors and Micromachines ◽

10.1541/ieejsmas.132.1 ◽

2012 ◽

Vol 132 (1) ◽

pp. 1-9 ◽

Cited By ~ 7

Author(s):

Satoshi Maruyama ◽

Muneki Nakada ◽

Makoto Mita ◽

Takuya Takahashi ◽

Hiroyuki Fujita ◽

...

Keyword(s):

Equivalent Circuit ◽

Pulse Width ◽

Pulse Width Modulation ◽

Equivalent Circuit Model ◽

Circuit Model ◽

Comb Drive ◽

Optical Scanner

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A Novel, Improved Equivalent Circuit Model for Double-Sided Linear Induction Motor

Electronics ◽

10.3390/electronics10141644 ◽

2021 ◽

Vol 10 (14) ◽

pp. 1644

Author(s):

Qian Zhang ◽

Huijuan Liu ◽

Tengfei Song ◽

Zhenyang Zhang

Keyword(s):

Finite Element ◽

Finite Element Model ◽

Equivalent Circuit ◽

Skin Effect ◽

Equivalent Circuit Model ◽

Element Model ◽

Circuit Model ◽

End Effects ◽

3D Finite Element ◽

Linear Induction

A novel, improved equivalent circuit model of double-sided linear induction motors (DLIMs) is proposed, which takes the skin effect and the nonzero leakage reactance of the secondary, longitudinal, and transverse end effects into consideration. Firstly, the traditional equivalent circuit with longitudinal and transverse end effects are briefly reviewed. Additionally, the correction coefficients for longitudinal and transverse end effects derived by one-dimensional analysis models are given. Secondly, correction factors for skin effect, which reflects the inhomogeneous air gap magnetic field vertically, and the secondary leakage reactance are derived by the quasi-two-dimensional analysis model. Then, the proposed equivalent circuit is presented, and the excitation reactance and secondary resistance are modified by the correction coefficients derived from the three analytical models. Finally, a three-dimensional (3D) finite element model is used to verify the proposed equivalent circuit model under varying air gap width and frequency, and the results are also compared with that of the traditional equivalent circuit models. The calculated thrust characteristics by the proposed equivalent circuit and 3D finite element model are experimentally validated under a constant voltage–frequency drive.

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