Search results for: Yiliang Lv

Items from 1 to 15 out of 15 results

article

Investigation of accurate forming of a semi-ellipsoidal shell part by an electromagnetic forming method

Ning Liu, Zhipeng Lai, Quanliang Cao, Liang Li, more

The International Journal of Advanced Manufacturing Technology > 2019 > 105 > 1-4 > 1113-1128

Forming a sheet into a predesigned die cavity is an effective way to improve the dimensional accuracy of deformed parts. However, it is difficult to obtain good die-fitting quality for workpiece deformed at high speed during the one-time discharge electromagnetic forming (EMF) process. To address this challenge, a numerical simulation model was established to help optimize the forming process that...

article

Rapid decomposition of diclofenac in a magnetic field enhanced zero-valent iron/EDTA Fenton-like system

Tao Zhou, Ke Feng, Wei Xiang, Yiliang Lv, more

Chemosphere > 2018 > 193 > C > 968-977

OH, attacking via the hydroxylation and substituted dechlorination of the chlorinated aromatic ring, as well as by dehydration between the N atom and the acetoxyl. It could also be directly dechlorinated by ZVI reduction simultaneously. The reaction mechanism and promotional role of MF in the MF/ZVI/EDTA system were proposed. It is suggested that MF mainly alters the heterogeneous ZVI surface-bond...

chapter

Design and experiment of surface-mounted permanent-magnet motors with integrated magnetizing windings

Yiliang Lv, Qingjian Wang, Bin Luo, Junjie Wu, more

2017 20th International Conference on Electrical Machines and Systems (ICEMS) > 1 - 5

2017 20th International Conference on Electrical Machines and Systems (ICEMS)

A novel method for post-assembly magnetization of surface-mounted permanent-magnet motors is proposed. The magnetizing windings are directly wound on the outer surface of the permanent magnet (PM), and then assembled on surface of the rotor. The PM poles can be magnetized and demagnetized after assembly by the integrated magnetizing windings. Once the PM poles experience demagnetization fault, the...

chapter

Post-assembly magnetization of high speed PM rotor with metallic sleeve

Yiliang Lv, Dong Xia, Qingjian Wang, Liang Li

2017 20th International Conference on Electrical Machines and Systems (ICEMS) > 1 - 5

2017 20th International Conference on Electrical Machines and Systems (ICEMS)

Post-assembly magnetization can greatly simplify the manufacturing process and improve the performance of permanent magnet (PM) motors, especially for high speed PM rotor with metallic retaining sleeve. The retaining sleeve has to be heated up during the shrink-fit process and the high temperature will cause irreversible demagnetization of the pre-magnetized magnet. We had developed a post-assembly...

article

Design and Experimental Validation of a Pulsed Electromagnetic Sheet Shearing System

Yujie Huang, Xiaotao Han, Quanliang Cao, Xin Li, more

IEEE Transactions on Applied Superconductivity > 2016 > 26 > 4 > 1 - 5

A pulsed electromagnetic shearing system consisting of a pulsed magnet driven by a capacitor bank and a conductive plate as a driver has been proposed, designed, and developed for thick plate cutting. The interaction of the pulsed magnetic field with the eddy current induced on the copper driver produces a huge Lorentz force that pushes a blade to cut off the steel sheet of heavy thickness. To validate...

article

Analytical solution to magnetic field distribution of a parallel magnetised rotor with cylindrical or ring-type permanent magnet

Wenjie Cheng, Yanhua Sun, Lie Yu, Lei Huang, more

IET Electric Power Applications > 2015 > 9 > 6 > 429 - 437

Ultra-high-speed permanent magnet synchronous motors (PMSMs) usually use bipolar rotors with ring permanent magnets (PMs) or cylindrical PMs which are magnetised in parallel. The stator of the motor is first simplified as a slotless stator, and an analytical solution to the flux density distribution in the motor is obtained by solving the Laplace's equation in the regions of PM and airgap. Then, by...

article

Fabrication and Test of a 40 T Long-Pulse Magnet Driven by Battery Bank

Yiliang Lv, Tao Peng, Guobin Wang, Tonghai Ding, more

IEEE Transactions on Applied Superconductivity > 2014 > 24 > 3 > 1 - 4

A 40 T long-pulse magnet has been constructed and tested to 32 T with total pulse width of 1.5 s at the Wuhan National High Magnetic Field Center (WHMFC). The magnet is energized by a battery bank power source consisting of 900 12 V/200 Ah lead-acid battery cells. The magnet consists of a polyhelix inner coil and an outer coil wound with copper foil. We made some improvements by adding axial slots...

article

Development of a High-Stability Flat-Top Pulsed Magnetic Field Facility

Houxiu Xiao, Yue Ma, Yiliang Lv, Tonghai Ding, more

IEEE Transactions on Power Electronics > 2014 > 29 > 9 > 4532 - 4537

A high stability flat-top pulsed magnetic field has both high field strength and high field stability simultaneously, which can be used for the high precision scientific experiments. In this paper, we present such a high stability flat-top pulsed magnetic field facility developed in the Wuhan National High Magnetic Field Center. A passive bypass circuit is developed to regulate current up to tens...

article

Design and Test of a Long-Pulse Large Current Sensor With a Hall Probe Installed Inside

Guobin Wang, Yiliang Lv, Houxiu Xiao, Liang Li

IEEE Transactions on Applied Superconductivity > 2014 > 24 > 3 > 1 - 4

A high accuracy large current sensor which can directly output the current signal without integral has been designed, fabricated, and tested. It is composed of a coreless helix coil cut by pure copper tube and a hall probe installed inside. It has excellent linear performance due to the absence of iron core. The ability of resisting disturbance is much improved because the hall probe is installed...

article

Analysis and Experiment of Battery Bank Power Supply System for Long Pulse Helical Magnet in WHMFC

Tonghai Ding, Yue Ma, Hui Chen, Yiliang Lv, more

IEEE Transactions on Applied Superconductivity > 2014 > 24 > 3 > 1 - 4

Traditionally, pulse capacitor and pulse generator power supply are frequently used to energize pulse high magnet up to 100 T, but they are not the ideal power supply for long pulse and low ripple high magnetic field so that they cannot meet higher requirement of science research and wider application in industry. In Wuhan National High Magnetic Field Center (WHMFC), a new type power supply system...

article

Design and Experiments of a High Field Electromagnetic Forming System

Li Qiu, Xiaotao Han, Tao Peng, Hongfa Ding, more

IEEE Transactions on Applied Superconductivity > 2012 > 22 > 3 > 3700504

The concept of capacity coefficient is introduced to evaluate the processing capacity of electromagnetic forming (EMF). An EMF system design method, including capacity coefficient design, inductance design and strength design, is developed by a finite element method. The geometry and size of the driving coil are optimized by the capacity coefficient design. The inductance design is aimed at obtaining...

article

Finite Element Analysis for Stress and Magnetic Field of a 40 kA Protection Inductor

Li Qiu, Yiliang Lv, Liang Li

IEEE Transactions on Applied Superconductivity > 2010 > 20 > 3 > 1936 - 1939

The protection inductor serves for limiting the peak current in order to protect the thyristor switch of the pulsed magnetic field facility in case of a short circuit. Because of the high current and strong magnetic field, the Lorentz force in the protection inductor is large. This paper describes the calculation of the inductance and the optimization of the stresses in the protection inductor. A...

article

Electrical and Thermal Modeling of Pulsed Magnets Using Finite Element Analysis

Yunxing Song, Tao Peng, Liang Li, Yiliang Lv, more

IEEE Transactions on Applied Superconductivity > 2010 > 20 > 3 > 1785 - 1789

A precise and efficient finite element model has been developed to solve the coupling of the magnetic field and heating in pulsed coils energized by a capacitor bank. The magnetic field and the current density distribution in each conductor layer of the coil are simulated, taking into account the eddy current, magneto-resistance and heat conduction. The temperature distribution in the conductor during...

article

25 kV/40 kA Protection Inductor for Capacitor Bank of the Wuhan Pulsed High Magnetic Field Facility

Yiliang Lv, Li Qiu, Shiluo Zhang, Yaping Tang, more

IEEE Transactions on Applied Superconductivity > 2010 > 20 > 3 > 1211 - 1214

A 25 kV/40 kA protection inductor with low stray field was designed and the first prototype was fabricated. The protection inductor protected the thyristor switch in the capacitor bank, limit the current at 40 kA in case of a short circuit. It was designed as a toroidal system consisting of 12 coils evenly distributed in the perimeter of a circle. The inductance could be changed easily by adjusting...

chapter

Design on the protection inductor for the capacitor bank of Wuhan Pulsed High Magnetic Field facility

Yiliang Lv, Liang Li

2008 International Conference on Electrical Machines and Systems > 685 - 688

2008 11th International Conference on Electrical Machines and Systems (ICEMS 2008)

For the protection of the thyristor switches of the 12 MJ, 25 kV capacitor bank at the Wuhan Pulsed High Magnetic Field Center, inductors are designed to be placed in series with the switches to limit the current at 30 kA when the magnet is short in the circuit. To lower the interference of the stray field of the inductor to the environment, the inductor is designed as a toroidal system consisting...

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