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Jiangui Li
School of Mechanical and Electronic Engineering, Wuhan University of Technology, Wuhan, China

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Original article
Published: 12 April 2021 in Journal of Power Electronics
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Wireless power transfer (WPT) is favored by consumers due to its convenience, safety, and flexible layout. Circular and rectangular coils are the most common coil structures in WPT systems. However, they are not suitable for installation conditions with angled groove areas such as railways, conveyors, and so on. To fully utilize installation space and to improve transfer efficiency, this paper has proposed a quasi-bowl-shaped (QBS) magnetic coupler, which can suitably fit on angled grooves. First, a QBS coupler model was presented. Second, formulas of its spatial magnetic field density were derived. Third, the influences of the bending distance and bending angle on the coupler coefficient were analyzed. Fourth, five magnetic core types were presented and analyzed for coupler optimization. Finally, QBS WPT performances were tested on a newly built experiment platform. Experimental results show that the QBS coupler can realize a constant transfer efficiency of 92.36% at an axial distance of 6 cm, and it can realize a constant transfer efficiency of 84.17% at an axial distance of 10 cm.

ACS Style

Chen Chen; Jiangui Li; Longyang Wang; Hui Nie; Qiang Li. Wireless power transfer system for angled concave conditions utilizing quasi-bowl-shaped couplers. Journal of Power Electronics 2021, 21, 1061 -1071.

AMA Style

Chen Chen, Jiangui Li, Longyang Wang, Hui Nie, Qiang Li. Wireless power transfer system for angled concave conditions utilizing quasi-bowl-shaped couplers. Journal of Power Electronics. 2021; 21 (7):1061-1071.

Chicago/Turabian Style

Chen Chen; Jiangui Li; Longyang Wang; Hui Nie; Qiang Li. 2021. "Wireless power transfer system for angled concave conditions utilizing quasi-bowl-shaped couplers." Journal of Power Electronics 21, no. 7: 1061-1071.

Journal article
Published: 03 March 2020 in IEEE Access
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In order to improve poor anti-offset capability of rotary transformer in electric excitation motor, a coaxial nested rotary wireless power transfer (CNR-WPT) system has been proposed in this paper. Firstly, considering the spatial geometric relationship of the coils and the power transmission efficiency of the CNR-WPT, the preliminary coil structure has been proposed. Secondly, through theoretical derivation, the specific relationship between the mutual inductance of the coils and the offset have been studied to verify the feasibility of the preliminary design. Thirdly, aiming at the problem that the CNR-WPT is susceptible to steel interference, the magnetic field has been optimized by adding ferrite and introducing a protective casing in this paper. Finally, an experimental platform for CNR-WPT system has been built. The experimental results verify that the power transmission efficiency of the CNR-WPT system can reach 90% when the radial offset and axial offset are below 5 mm, and the angular offset is below 5°. The energy losses can be reduced by adding ferrite and protecting the casing. The CNR-WPT system thereof can also be applied to other rotary power transmission occasions.

ACS Style

Longyang Wang; Jiangui Li; Hui Nie; Jincheng Liu; Shaoxing Ke. Coaxial Nested Couplers-Based Offset-Tolerance Rotary Wireless Power Transfer Systems for Electric Excitation Motors. IEEE Access 2020, 8, 44913 -44923.

AMA Style

Longyang Wang, Jiangui Li, Hui Nie, Jincheng Liu, Shaoxing Ke. Coaxial Nested Couplers-Based Offset-Tolerance Rotary Wireless Power Transfer Systems for Electric Excitation Motors. IEEE Access. 2020; 8 (99):44913-44923.

Chicago/Turabian Style

Longyang Wang; Jiangui Li; Hui Nie; Jincheng Liu; Shaoxing Ke. 2020. "Coaxial Nested Couplers-Based Offset-Tolerance Rotary Wireless Power Transfer Systems for Electric Excitation Motors." IEEE Access 8, no. 99: 44913-44923.

Journal article
Published: 02 May 2018 in Energies
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As a key factor in the design of a voltage-adjustable LLC resonant converter, frequency regulation range is very important to the optimization of magnetic components and efficiency improvement. This paper presents a novel optimal design method for LLC resonant converters, which can narrow the frequency variation range and ensure high efficiency under the premise of a required gain achievement. A simplified gain model was utilized to simplify the calculation and the expected efficiency was initially set as 96.5%. The restricted area of parameter optimization design can be obtained by taking the intersection of the gain requirement, the efficiency requirement, and three restrictions of ZVS (Zero Voltage Switch). The proposed method was verified by simulation and experiments of a 150 W prototype. The results show that the proposed method can achieve ZVS from full-load to no-load conditions and can reach 1.6 times the normalized voltage gain in the frequency variation range of 18 kHz with a peak efficiency of up to 96.3%. Moreover, the expected efficiency is adjustable, which means a converter with a higher efficiency can be designed. The proposed method can also be used for the design of large-power LLC resonant converters to obtain a wide output voltage range and higher efficiency.

ACS Style

Junhao Luo; Junhua Wang; Zhijian Fang; Jianwei Shao; Jiangui Li. Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation. Energies 2018, 11, 1124 .

AMA Style

Junhao Luo, Junhua Wang, Zhijian Fang, Jianwei Shao, Jiangui Li. Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation. Energies. 2018; 11 (5):1124.

Chicago/Turabian Style

Junhao Luo; Junhua Wang; Zhijian Fang; Jianwei Shao; Jiangui Li. 2018. "Optimal Design of a High Efficiency LLC Resonant Converter with a Narrow Frequency Range for Voltage Regulation." Energies 11, no. 5: 1124.

Journal article
Published: 10 May 2017 in Polymers
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Three kinds of fiber reinforced plastic (FRP) composites, including modified polyurethane resin (LGD), epoxy resin (E44) and modified unsaturated polyester resin (D33) glass-fiber reinforced plastics, were subjected to a 5000 h multi-factor accelerated aging test according to the power industry standard. To examine aging resistance and thermal stability of transmission towers made by these three composites, relevant bending properties, thermogravimetric analysis (TGA) and derivative thermogravimetry (DTG), activation energy, as well as microscopic morphology were revealed. The results showed that for these composites, bending modulus retention rates were higher than 94% under the aging test and that of the LGD was highest. Additionally, the onset degradation temperature, temperature at maximum rate of weight loss and T5% reduced at 5000 h, with D33 having highest value and lowest decline rate. The activation energy was calculated with the Bagchi, Coats-Redfern and Broido method, respectively. Although the activation energy of all composites decreased after test, the D33, LGD materials had the highest activation energy which enjoys slight decline. Analysis of the whole experimental results suggested that D33 and LGD composites have good aging resistance, whose basic performance could still perform well after 5000 h aging test, so they can be used to composite towers and applied to engineering practice.

ACS Style

Jianwei Shao; Junhua Wang; Mengjiao Long; Jiangui Li; Yayun Ma. 5000 h Multi-Factor Accelerated Aging Test of FRP Made Transmission Tower: Characterization, Thermal Decomposition and Reaction Kinetics Study. Polymers 2017, 9, 170 .

AMA Style

Jianwei Shao, Junhua Wang, Mengjiao Long, Jiangui Li, Yayun Ma. 5000 h Multi-Factor Accelerated Aging Test of FRP Made Transmission Tower: Characterization, Thermal Decomposition and Reaction Kinetics Study. Polymers. 2017; 9 (12):170.

Chicago/Turabian Style

Jianwei Shao; Junhua Wang; Mengjiao Long; Jiangui Li; Yayun Ma. 2017. "5000 h Multi-Factor Accelerated Aging Test of FRP Made Transmission Tower: Characterization, Thermal Decomposition and Reaction Kinetics Study." Polymers 9, no. 12: 170.

Journal article
Published: 17 April 2017 in Applied Sciences
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With the increase of urban population and electricity demand, in order to provide sufficient power to residents, distribution transformers are getting closer to residential buildings, and are even directly placed on the first floor or the basement of buildings due to space limitations. The vibration and noise with low frequency of mainly 50–250 Hz generated by the distribution transformers spread to rooms through beams, bricks, walls and other building structures, which inevitably damages the living environment. In this paper, through focusing on the frame of buildings, simulation models of the indoor distribution transformer vibrating in the structure field are built, including a two-layer model and a six-layer model. This paper simulates and analyzes the vibration response of the structural system, studies the propagation laws of the structure-borne sound caused by the transformer and quantitatively analyzes the attenuation characteristics of the vibration. Finally the prevention method of the structure-borne noise, called vibration isolation, is introduced and analyzed by the field test to evaluate the noise reduction effect.

ACS Style

Junhua Wang; Yi Xu; Kaibin Liang; Qisheng Liu; Jiangui Li; Kaipei Liu. Modeling Analysis on Propagation of Structure-Borne Vibration Caused by an Indoor Distribution Transformer in a Building and Its Control Method. Applied Sciences 2017, 7, 405 .

AMA Style

Junhua Wang, Yi Xu, Kaibin Liang, Qisheng Liu, Jiangui Li, Kaipei Liu. Modeling Analysis on Propagation of Structure-Borne Vibration Caused by an Indoor Distribution Transformer in a Building and Its Control Method. Applied Sciences. 2017; 7 (4):405.

Chicago/Turabian Style

Junhua Wang; Yi Xu; Kaibin Liang; Qisheng Liu; Jiangui Li; Kaipei Liu. 2017. "Modeling Analysis on Propagation of Structure-Borne Vibration Caused by an Indoor Distribution Transformer in a Building and Its Control Method." Applied Sciences 7, no. 4: 405.

Journal article
Published: 04 April 2017 in Applied Sciences
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Permanent-magnet vernier machines (PMVMs) have attracted much attention for their high efficiency and output torque in low-speed application. However, the conventional PMVM suffers from the problems of low power factor and high cogging torque. In this paper, a double-stator flux-focusing split-pole permanent-magnet vernier machine (SP-PMVM) with low cogging torque and high power factor has been proposed. The split-pole topology in the vernier motor has been used mainly to modulate the magnetic flux in this paper, although the stator teeth are used for this purpose in some cases. The newly-proposed SP-PMVM topology is characterized by reduced flux leakage through using a flux-focusing topology and staggering approximately half of the pitch angularly between the inner stator and outer stator. Firstly, the vernier principle of the proposed SP-PMVM has been investigated by analytical methods. Secondly, a 12-slot-stator and 22-pole-pair-rotor SP-PMVM has been optimized with the goal of maximum average steady-state torque and the minimum cogging torque and ripple. Thirdly, the overall performance of the newly-proposed SP-PMVM has been analyzed as compared with the conventional PMVM. The results verify that the SP-PMVM can provide higher power factor, higher output torque and lower cogging torque than that of the conventional PMVM in low-speed application.

ACS Style

Zhengwen Dai; Jiangui Li; Lin Zou; Junhua Wang; Ruiren Luo. A New High-Efficiency Double-Stator Split-Pole Permanent-Magnet Vernier Machine with Flux-Focusing Topology. Applied Sciences 2017, 7, 356 .

AMA Style

Zhengwen Dai, Jiangui Li, Lin Zou, Junhua Wang, Ruiren Luo. A New High-Efficiency Double-Stator Split-Pole Permanent-Magnet Vernier Machine with Flux-Focusing Topology. Applied Sciences. 2017; 7 (4):356.

Chicago/Turabian Style

Zhengwen Dai; Jiangui Li; Lin Zou; Junhua Wang; Ruiren Luo. 2017. "A New High-Efficiency Double-Stator Split-Pole Permanent-Magnet Vernier Machine with Flux-Focusing Topology." Applied Sciences 7, no. 4: 356.

Journal article
Published: 23 March 2017 in Energies
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In view of the shortcomings of current image detection methods for icing thickness on power transmission lines, an image measuring method for icing thickness based on remote online monitoring was proposed. In this method, a Canny operator is used to get the image edge, in addition, a Hough transform and least squares are combined to solve the problems of traditional Hough transform in the parameter space whereby it is easily disturbed by the image background and noises, and eventually the edges of iced power transmission lines and un-iced power transmission lines are accurately detected in images which have low contrast, complex grayscale, and many noises. Furthermore, based on the imaging principle of the camera, a new geometric calculation model for icing thickness is established by using the radius of power transmission line as a reference, and automatic calculation of icing thickness is achieved. The results show that proposed image recognition method is rarely disturbed by noises and background, the image recognition results show good agreement with the real edges of iced power transmission lines and un-iced power transmission lines, and is simple and easy to program, which suggests that the method can be used for image recognition and calculation of icing thickness.

ACS Style

Jingjing Wang; Junhua Wang; Jianwei Shao; Jiangui Li. Image Recognition of Icing Thickness on Power Transmission Lines Based on a Least Squares Hough Transform. Energies 2017, 10, 415 .

AMA Style

Jingjing Wang, Junhua Wang, Jianwei Shao, Jiangui Li. Image Recognition of Icing Thickness on Power Transmission Lines Based on a Least Squares Hough Transform. Energies. 2017; 10 (4):415.

Chicago/Turabian Style

Jingjing Wang; Junhua Wang; Jianwei Shao; Jiangui Li. 2017. "Image Recognition of Icing Thickness on Power Transmission Lines Based on a Least Squares Hough Transform." Energies 10, no. 4: 415.