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检索条件"机构=1State Key Laboratory of Advanced Electromagnetic Engineering and Technology"

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Experimental research on back EMF zero crossing detection method for novel transverse flux permanent magnet motor

Experimental research on back EMF zero crossing detection me...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Xiaotao Tu Chenglin Gu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Back EMF zero crossing detection method has been successfully applied to sensorless control of conventional brushless DC motor. This paper highlights the differences in its implementation for novel transverse flux permanent magnet motor (TFPMM), as regards additional detection error. The reasons for long commutation process in novel TFPMM have been discussed to indicate much wider voltage spikes, which is the essence of additional detection error. It has been also shown from experimental results that the zero crossing point of filtered phase voltage is ahead of that of corresponding back EMF. To determine the phase compensation for rotor-position-detection error, the corresponding phase difference is presented under varying load torque conditions.

关键词： Commutation Torque Permanent magnet motors Voltage measurement Sensorless control Inductance Brushless DC motors

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Position control of PM synchronous motors used for sewing machines based on high accuracy magnetic encoder

Position control of PM synchronous motors used for sewing ma...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Hongqin Xie Kai Yang Dadai Lu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

This article demonstrates a high performance control system based on an improved magnetic encoder, which is suitable for permanent magnet synchronous motor(PMSM), used for industrial sewing machines. The control system has good static and dynamic performance. The article mainly discusses the hardware and software of control system and the realization. The software is compiled on the basis of zero d-axes current vector control method and the classical PI control strategy. Experiments show the system can achieve relatively good control performance.

关键词： Control systems Magnetic cores Soft magnetic materials Magnetic flux leakage Amorphous magnetic materials Steady-state

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Plenary talk - advantages of electrical machines with high rotor pole number and challenges to power electronics

Plenary talk - advantages of electrical machines with high r...

引用

International Conference on Applied Superconductivity and electromagnetic Devices, ASEMD

作者： R. Qu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

As renewable energy and green technologies, such as wind power generation, and electric vehicles, draw more and more attention in industries and academic, electrical machines are becoming a core to many technologies, i.e. direct-drive wind generators, motors in an electric car. Machine torque or power density is getting more and more critical, many people use it as a key to judge if an electrical machine is suitable for an applications. Meanwhile, high material price, such as permanent magnet, copper, and iron, provides another reason to improve machine torque density - reduce material cost. Therefore, the electric machines with high torque density are strongly desired to almost all industry areas.

关键词： Torque Rotors Educational institutions Power electronics Industries Awards activities

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The preliminary design of ECE for J-TEXT

The preliminary design of ECE for J-TEXT

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第十五届全国等离子体科学技术会议

作者： XIAO Jinshui YANG Zhoujun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China Key Laboratory of Fusion and Advanced Electromagnetic Technology of Ministry of Education Wuhan 430074China

An Electron cyclotron emission (ECE) diagnostic has the unique capability of continuous measurement of the time evolution of the electron temperature *** an ECE system is necessary to be developed for electron temperature maasurement on J-TEXT tokamak,with the major radius R is l.05m,the minor radius a is 0.27m,plasma current Ip,is 200kA,toroidal field B0 is *** choice of the 2nd harmonic X-mode electron cyclatron emission,propagating perpendicular to the magnetic field,represents the best compromise between good optical thickness (which assures radial localization of the measurement) and short wavelength (which assures both poloidal and radial localization).A 16-channel heterodyne radiometer system is being built on J-TEXT which the frequency coverage range of the 16-channel heterodyne radiometer system is 94 GHz (r/a = 0.74) to 125 GHz(r/a= 0.40).

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Study on System Identification based on Rogowski coil measuring

Study on System Identification based on Rogowski coil measur...

引用

2nd Annual Conference on Electrical and Control engineering, ICECE 2011

作者： Gao, Feng Liu, Chun State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781424481637

In order to solve the problem of self-integrating Rogowski coil failing in measuring High-frequency Traveling wave current accurately, this paper come up with a System Identification solution based on Rogowski coil measuring. Through analyzing the measuring principles of Rogowski coil and using Square wave response to establish the Transfer function of the measurement system, digital correction of Rogowski coil's low-frequency distortion was finally realized. © 2011 IEEE.

关键词： Religious buildings

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A control strategy of three-phase voltage-sourced PWM rectifier

A control strategy of three-phase voltage-sourced PWM rectif...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Ende Wang Shenghua Huang State Key Laboratory Ratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology China

The double closed loops control strategy composed of inner current loop and outer voltage loop in the d-q synchronous frame is a relatively common control strategy of the three-phase voltage-sourced PWM rectifier. The system can not be completely decoupled because of the variable inductance in the actual system. And for simple, the decoupled part of the controller is usually ignored. What's more, the equation of the outer voltage loop is nonlinear. According to the analysis of the model of the rectifier, a novel double closed loops control strategy composed of inner current loop in the complex vector and outer square of the voltage loop, is proposed. The inner current loop using the mentioned control strategy can be completely decoupled without the exact value of the boost inductance, and the equation of the outer square of the voltage loop is linear. From the results of the simulation, the mentioned control strategy can greatly improve the dynamic and static of the system.

关键词： Voltage control Rectifiers Pulse width modulation Inductance Vectors Mathematical model Steady-state

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Direct torque control of novel transverse flux permanent magnet motor based on phase advance commutation

Direct torque control of novel transverse flux permanent mag...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Xiaotao Tu Chenglin Gu State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

Novel transverse flux permanent magnet motor (TFPMM) with Brushless DC drive is expected to be applied to direct-drive electric vehicles. To reduce torque ripple and obtain faster torque response, direct torque control (DTC) with position sensors instead of flux linkage observer has been employed. The voltage vectors are determined by position of magnetic poles as well as torque hysteresis comparator. In consideration of much longer commutation process caused by the features of novel TFPMM, phase advance commutation has been brought in DTC to achieve maximum torque per ampere. Simulation results have been presented to verify the effectiveness of the proposed method.

关键词： Torque Commutation Couplings Stators Vectors Torque control Rotors

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A full-feedforward scheme of grid voltages for a three-phase grid-connected inverter with an LCL filter

A full-feedforward scheme of grid voltages for a three-phase...

引用

IEEE Energy Conversion Congress and Exposition, ECCE

作者： Weiwei Li Donghua Pan Xinbo Ruan Xuehua Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

For a current controlled grid-connected inverter, the grid voltage distortion will give rise to the injected grid current harmonics. Besides, for the three-phase grid-connected inverter, under the unbalanced grid voltage condition, the injected grid currents will become unbalanced. This paper aims at weakening the effect of the grid voltages on the injected grid currents for a three-phase grid-connected inverter with an LCL filter. The full-feedforward scheme of the grid voltages is investigated in this paper. The full-feedforward function of the grid voltages in the stationary α-β frame for a three-phase grid-connected inverter with an LCL filter is proposed. This full-feedforward function consists of three parts, which is proportional part, derivative part and second derivative part. With the proposed full-feedforward scheme of the grid voltages, approximately zero steady-state error of the injected grid currents at line frequency can be achieved even with proportional-integral (PI) compensators as the injected grid current regulators in the stationary α-β frame. The injected grid current distortion and unbalance caused by the grid voltages are also greatly reduced. At last, the effectiveness of the proposed full-feedforward scheme is verified by the experimental results.

关键词： Power harmonic filters Inverters Feedforward neural networks Harmonic analysis Capacitors Inductors Harmonic distortion

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Influence of parameters on field weakening performance of induction motor

Influence of parameters on field weakening performance of in...

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Shiying Duan Libing Zhou State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

An analysis model is proposed to investigate the effects of parameters on efficiency and power factor of induction motor in field weakening operation, considering the influence of magnetic saturation. The field oriented control and maximum torque per ampere control strategy are adopted for the steady state performance calculation in the field weakening region. Based on the comparison by variations of design schemes, rotor shapes and inverter current limits, some useful design principles for better field weakening performance are proposed.

关键词： Rotors Inductance electromagnetics Induction motors Inverters Shape Torque

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Relationship between magnetic gears and vernier machines

Relationship between magnetic gears and vernier machines

引用

International Conference on Electrical Machines and Systems (ICEMS)

作者： Ronghai Qu Dawei Li Jin Wang State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan China

It is demonstrated that a vernier machine and a magnetic gear work under a same principle, and the vernier machine teeth perform the flux modulation function, same as the ferromagnetic pieces do in a magnetic gear. A vernier machine is equal to a system consisting of a magnetic gear and a normal machine. Moreover, this paper presents how to convert a magnetic gear machine system to a vernier machine, and discusses structure differences among vernier machine, magnetic gear, and many other magnetic gear based topologies. It is illustrated that all these topologies share a same operation principle. This conclusion is verified by FEA simulation results. Finally, advantages and disadvantages of each topology are discussed and some application suggestions are given as well.

关键词： Gears Magnetic flux Rotors Magnetoacoustic effects Topology Stator windings

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