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RISS 인기검색어
- 검색키워드
- 저자 : Weili Dai (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Phase-shifted and interleaved angle control for doubly Salient Electro-magnetic Machine
Weili Dai,Hao Tian,Jun Ding 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
Doubly salient electro-magnetic machine using traditional control method has large torque ripple for dead-time during commutation process and its special structure. During commutation, electro-magnetic torque and power will decrease quickly due to all switches are off states. In order to avoid the problem, a novel phase-shifted and interleaved angel control strategy was proposed in this paper. The control algorithm can eliminate dead-time and shape phase current of electric machine to improve output power and reduce torque ripple by adjusting phase-shifted angle and interleaved angle. In this paper, the mathematical model of the machine and working principle of the control strategy were described in detail. Moreover, phase-shifted and interleaved angle optimum method based on low torque ripple and large output power was also given. Finally, a “field-circuit” co-simulation model of motor driving system based on novel control method was built by electro-magnetic finite element analysis and transient solver of control circuit, and simulation results verify theory analysis.
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A Wireless Power Transfer System based on Class E Amplifier
Weili Dai,Wei Tang,Yuanxiu Xiao,Juntao Fei 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper, a wireless power system based on class E amplifier is constructed, and the mathematical model based on inductive coupling between transmitting and receiving windings are built subsequently. The values of some components for transmitter are optimized precisely according to the optimal working point of load resistance. Formulas for the optimal transmitter, receiver, and class E components are derived given a set of constraints on the load resistance, inductance values of the coupler, the phase angle and quality factor of load impedance, and drain voltage waveform. Moreover, the simulation is fulfilled to verify the method to calculate parameters. Using a separating transformer with a pot type ferrite core and a series.parallel arrangement for load impedance transformer, A wireless power transfer system based an open loop class E amplifier has been built and experimental results show that the system has desirable performance, including a power delivery of 4.2W with the distance is 10mm, and the peak efficiency of system is over 72%.
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Voltage Regulation System based on ADRC for Doubly Salient Electro-magnetic Generator
Jun Ding,Weili Dai,Hao Tian,Juntao Fei 제어로봇시스템학회 2014 제어로봇시스템학회 국제학술대회 논문집 Vol.2014 No.10
A voltage regulation system based on linear active disturbance rejection control (LADRC) for doubly salient electro-magnetic generator (DSEG) was proposed in this paper. Based on mathematical model and operation principle of the generator, second-order LADRC controller was constructed to keep output dc voltage stable by adjusting exciting current and corresponding operation principle was analyzed in detail. Then, control parameters selection method has been given according to engineer design consideration. Finally, co-simulation models of voltage regulation system for DSEG using LADRC and traditional output voltage feedback plus exciting current feed-forward control were built by electromagnetic finite element analysis and transient solver of control circuit. The steady state and dynamic performance of the generator under different load show that DSEG using LADRC will acquire much better steady and dynamic response characteristic than one using traditional control.
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Aqueous Synthesis and Photocatalytic Performance of Bi5O7I Microflowers
Yuehong Song,Xinli Hao,Weili Dai,Jingzhe Zhao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
Bi5O7I microflowers were synthesized through a simple liquid coprecipitation under alkaline condition at 75 ℃ in an open system without using autoclave or other complex equipment. The addition of NaBr was a key factor for controlling the morphology of Bi5O7I. The assembled Bi5O7I samples are constructed by elementary nanowires, which were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and UV-Vis diffuse reflection spectroscopy (UV-Vis DRS) methods. The photocatalytic performance of Bi5O7I samples on rhodamine B (RhB), methylene blue (MB) and ciprofloxacin (CIP) was evaluated under 350 W xenon lamp irradiation. On comparison with the blank Bi5O7I microflowers, Bi5O7I microflowers with NaBr addition exhibited better photocatalytic performance, and the photocatalytic activity enhanced with the increase of NaBr amount. The photocatalytic efficiency reached 81.1% in 150 min for RhB, 42.5% in 210 min for MB and 56.3% in 210 min for CIP in the degradation system at pH = 7 without any assistant agent. Trapping experiments were performed to reveal the degradation mechanism of Bi5O7I samples. It was proposed that valid separation of photogenerated electrons and holes in Bi5O7I microflowers led to good catalytic properties.
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Adaptive Backstepping Sliding Mode Control for MEMS Gyroscope
Juntao Fei,MingyuanXin,Weili Dai 제어로봇시스템학회 2013 제어로봇시스템학회 국제학술대회 논문집 Vol.2013 No.10
In this paper, an adaptive backstepping sliding mode control approach is proposed to attenuate the tracking error and control the MEMS triaxial gyroscope. An adaptive backstepping controller that can compensate the system nonlinearities is incorporated into the sliding mode control scheme in the Lyapunov framework. First, a robust backstepping control system incorporated with sliding mode control technique is designed. Then, an adaptive law is derived to estimate the upper bound value of the lumped uncertainty in the backstepping sliding mode control. With the adaptive backstepping sliding mode controller, the chattering in control efforts can be obviously reduced. Numerical simu lation is provided to verify the effectiveness of the proposed scheme.
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