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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Jhih-Da Hsu Ying-Yu Tzou Power Electronics Systems & Chips Laboratory Advanced Power Electronics Center Department of Electrical and Control Engineering National Chiao Tung University Taiwan

This paper presents the modeling of a voice coil motor (VCM) used for the auto-focusing control of a digital camera in applications to high-performance mobile phones. The force constant and its associated back EMF constant of a VCM can be highly nonlinear with the mechanical structure. Conventional modeling technique using the derived flux distribution based on geometrical structure is quite involved and impractical to identify its equivalent parameters. A modeling procedure for a specially designed VCM is developed based on its mechanical structure and used material by using an electromagnetic simulation software - the Ansoft's Maxwell 2D. An iterative optimal design process is then proposed to maximize the force constant of the VCM with a specified volume. Simulation results with experimental verification are given to illustrate that the proposed design procedure can achieve a satisfactory performance.

关键词： Electromagnetic modeling Digital cameras Coils Mobile handsets Energy consumption Design optimization Power system modeling Power electronics Electromagnetic forces Process design

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TRACKING control IN THE PRESENCE OF NONLINEAR DYNAMIC FRICTIONAL EFFECTS: ROBOT EXTENSION

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Asian Journal of control 2008年第3期1卷

作者： M. Feemster D.M. Dawson A. Behal W. Dixon Matthew Feemster received the B.S degree in Electrical Engineering from Clemson University Clemson South Carolina in December 1994. Upon graduation he remained at Clemson University and received the M.S. degree in Electrical Engineering in 1997. During this time he also served as a research/teaching assistant. His research work focused on the design and implementation of various nonlinear control algorithms with emphasis on the induction motor and mechanical systems with friction present. He is currently working toward his Ph.D. degree in Electrical Engineering at Clemson University. Darren M. Dawson was born in 1962 in Macon Georgia. He received an Associate Degree in Mathematics from Macon Junior College in 1982 and a B.S. Degree in Electrical Engineering from the Georgia Institute of Technology in 1984. He then worked for Westinghouse as a control engineer from 1985 to 1987. In 1987 he returned to the Georgia Institute of Technology where he received the Ph.D. Degree in Electrical Engineering in March 1990. During this time he also served as a research/teaching assistant. In July 1990 he joined the Electrical and Computer Engineering Department and the Center for Advanced Manufacturing (CAM) at Clemson University where he currently holds the position of Professor. Under the CAM director's supervision he currently leads the Robotics and Manufacturing Automation Laboratory which is jointly operated by the Electrical and Mechanical Engineering departments. His main research interests are in the fields of nonlinear based robust adaptive and learning control with application to electro-mechanical systems including robot manipulators motor drives magnetic bearings flexible cables flexible beams and high-speed transport systems. Aman Behal was born in India in 1973. He received his Masters Degree in Electrical Engineering from Indian Institute of Technology Bombay in 1996. He is currently working towards a Ph.D in Controls and Robotics at Clemson University. His research focuses on the control of no

In this paper, we extend the observer/control strategies previously published in [25] to an n -link, serially connected, direct drive, rigid link, revolute robot operating in the presence of nonlinear friction effects modeled by the Lu-Gre model. In addition, we also present a new adaptive control technique for compensating for the nonlinear parameterizable Stribeck effects. Specifically, an adaptive observer/controller scheme is developed which contains a feedforward approximation of the Stribeck effects. This feedforward approximation is used in a composite controller/observer strategy which forces the average square integral of the position tracking error to an arbitrarily small value. Experimental results are included to illustrate the performance of the proposed controllers.

关键词： Friction compensation nonlinear control

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Eigenvector Algorithms for Blind Deconvolution of MIMO-IIR systems

Eigenvector Algorithms for Blind Deconvolution of MIMO-IIR S...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Mitsuru Kawamoto Kiyotaka Kohno Yujiro Inouye National Institute of Advanced Industrial Science and Technology (AIST) Tsukuba Ibaraki Japan Department of Electronic and Control Systems Engineering Shimane University Matsue Japan

This paper presents eigenvector algorithms (EVAs) for blind deconvolution (BD) of multiple-input multiple-output infinite impulse response (MIMO-IIR) channels (convolutive mixtures). Using the idea of reference signals, the EVA is derived. Differently from the conventional researches on EVAs, one of the novel points of the paper is that the EVA using any reference signal is applied to the BD problem of the MIMO-IIR system, and then the validity of the EVA is shown.

关键词： Deconvolution MIMO Source separation Signal processing algorithms Signal processing Blind source separation Electrical equipment industry Electronics industry Industrial control Industrial electronics

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Digital control of a Multi-Phase Interleaved PWM Inverter with Minimal Total Harmonic Distortion

Digital Control of a Multi-Phase Interleaved PWM Inverter wi...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Yu-Tzung Lin Ying-Yu Tzou Power Electronics Systems & Chips Laboratory Advanced Power Electronics Center Department of Electrical and Control Engineering National Chiao Tung University Hsinchu Taiwan

This paper presents a digital repetitive control scheme for the minimization of output voltage total harmonic distortion (THD) of a PWM inverter under large unknown nonlinear load. The multi-phase interleaved PWM inverter has been adopted to enhance the effective switching frequency as well as to share the load current. The realization of a digital control for PWM inverter, such as sampling delay and quantization error, may introduce many nonlinear effects to distort its output waveforms. A systematic design procedure is developed to minimize selected range of harmonic spectrum by shaping the output impedance by so that its output voltage THD can be lower than a specified value with given design constraints. The proposed control scheme has been realized with fully digital design by using a single-chip FPGA implementation and verified by using co-simulation technique via a VHDL simulator Modelsim combined with a system-level block diagram oriented simulator Simulink.

关键词： Digital control Pulse width modulation inverters Total harmonic distortion Voltage control Switching frequency Sampling methods Delay effects Propagation delay Quantization Impedance

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A New Sensorless Starting Method for Brushless DC Motors without Reversing Rotation

A New Sensorless Starting Method for Brushless DC Motors wit...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Yen-Chuan Chang Ying-Yu Tzou Power Electronics Systems and Chips Laboratory Advanced Power Electronics Center Department of Electrical and Control Engineering National Chiao Tung University Hsinchu Taiwan

This paper presents a new sensorless starting method for brushless DC motors without reversing rotation for unidirectional applications. The method can detect the rotor position at standstill and a specific start-up method is then used to accelerate the motor up to a middle-speed where conventional sensorless control algorithms based on the back- EMF can work properly. The proposed scheme employs only one current sensor at DC-link side of the inverter, and can be applied to a motor without knowing its parameters and additional position sensors. As compared with previous approaches, the presented technique can simplify the sensorless position detection procedure and lower the cost. The proposed initial rotor position detection technique has a resolution of 30 electrical degrees, and does not cause any rotor vibration during the detection process. The sensorless starting scheme has been implemented on a single-chip DSP controller (TMS320LF2407A) and experimental results reveal that the starting procedure can work smoothly without temporarily reversing rotation.

关键词： Brushless DC motors Rotors DC motors Synchronous motors Sensorless control Voltage Permanent magnet motors Power electronics Inverters Costs

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Single-Chip FPGA Implementation of a Digital VRM controller with Interlaced Sampling and control Technique

Single-Chip FPGA Implementation of a Digital VRM Controller ...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

作者： Yu-Tzung Lin Yi-Chung Wang Ying-Yu Tzou Power Electronics Systems & Chips Laboratory Advanced Power Electronics Center Department of Electrical and Control Engineering National Chiao Tung University Hsinchu Taiwan

This paper presents the design and implementation of a singe-chip FPGA based digital VRM controller for multi-phase synchronous buck converters with interlaced current sampling and load current feed-forward compensation techniques. The sampling of the inductor current is synchronized with the middles of leading and trailing edges of the PWM signal of each synchronous buck converter for both turn-on and turn-off. The proposed sampling scheme has a high noise immunity to the common-mode switching noises induced by the switching of the MOSFET and its parasitic junction capacitances resulted by the heat sink. A true average current signal with minimum response time can be measured with accuracy within a switching period. The timing clocks for the digital controller and the digital PWM generator are interlaced with each other to achieve a minimum delay at a same sampling and switching frequency. A digital interface is designed for the connected microprocessor load to adjust the output voltage and provide feed-forward load current compensation according to its clock rate, loading factor, and pipeline scheduling. The realization scheme for the proposed digital VRM controller has been described. Simulation analysis and experimental verifications are given to illustrate the fast dynamic response control of VRM for advanced microprocessors.

关键词： Field programmable gate arrays Digital control Sampling methods Pulse width modulation Buck converters Feedforward systems Delay Clocks Microprocessors Inductors

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Single-chip FPGA Implementation of a Sensorless Speed control IC for Permanent Magnet Synchronous Motors

Single-chip FPGA Implementation of a Sensorless Speed Contro...

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Annual IEEE Conference on Power Electronics Specialists (PESC)

This paper presents a single-chip FPGA implementation of a speed sensorless control IC with flux-linkage estimation algorithm for permanent-magnet synchronous motors (PMSM) with sinusoidal flux distribution. By using hierarchical and modular realization strategy, each functional block for the digital sensorless IC is designed as a reusable IP with FPGA implementation. The digital sensorless IC is configurable with its modular blocks and is programmable with its control registers via a serial interface to fit various applications without complicated software programming as realized by using conventional DSP or microcontrollers. The sensorless algorithm implemented uses the incremental values of flux linkage, the normalized back-EMF voltage, and the estimated peak back-EMF value to estimate the incremental rotor position. An internal closed-loop correction mechanism within this algorithm can automatically correct the rotor position estimation drift, which could be resulted by the quantization error, circuit nonlinearities, and sampling noises. An initial rotor position detection scheme with ramping speed control has been developed for startup control. Experimental verification has been carried out on a sensorless spindle motor drive system for DVD applications.

关键词： Field programmable gate arrays Velocity control Permanent magnet motors Sensorless control Digital integrated circuits Rotors Synchronous motors Application specific integrated circuits Application software Digital signal processing

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A Methodology for Maintenance-Interval Scheduling of Equipment Considering Maintenance Effect

A Methodology for Maintenance-Interval Scheduling of Equipme...

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International Conference on Clean Electrical Power (ICCEP)

作者： T. Zhang M. Nakamura H. Hatazaki Department of Automation Tsinghua University Beijing China Department of Advanced Systems Control Engineering Saga University Saga Japan Kyushu Electric Power Company Inc. Fukuoka Japan

This paper presents a methodology for maintenance-interval scheduling of equipment considering maintenance effect. By means of an operable ordering list of maintenance effects, all elements in a system can be ranked. For different purpose, maintenance intervals of elements can be scheduled as below. In order to reduce maintenance cost remarkably within a scale of system availability decrease, maintenance intervals of some elements with smaller maintenance effects are lengthened to decrease the number of system maintenance; In order to keep original system availability while reducing maintenance cost, maintenance intervals of some elements with larger maintenance effects are shortened to increase system availability, and at the same time maintenance intervals of some elements with smaller maintenance effects are lengthened to decrease the number of system maintenance. Based on this method, the maintenance intervals of equipments in thermal power stations are scheduled by use of the actual data from Kyushu Electric Power Co. of Japan, and thereby the effectiveness of the proposed method is verified. The proposed method can be adopted for many kinds of equipments or systems.

关键词： Job shop scheduling Costs Availability Power generation Mathematical model Power system reliability Predictive maintenance control engineering Automation Scheduling algorithm

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Human Intention Extracted from Electromyography Signals for Tracking Motion of Meal Assistance Robot

Human Intention Extracted from Electromyography Signals for ...

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2007 IEEE/ICME International Conference on Complex Medical engineering-CME2007(CME2007 第二届国际复合医学工程学术大会)

作者： X. Zhang B. Wang X.Y. Wang T. Sugi M. Nakamura Department of Automation East China University of Science and Technology Shanghai 200237 P. R. Ch Department of Electrical and Electronic Engineering Saga University Department of Advanced Systems Control Engineering Saga University Saga 840-8502 Japan

The objective of the present study is to determine if surface electromyography (EMG) signals can be used for controlling the motion of the meal assistance robot. The power of four EMG channels were calculated and encoded into five commands to track the motion of meal assistance robot. The results indicated that by using EMG signals, the meal assistance robot was able to follow the movement desire of the subjects and help them to eat. This study has shown the possibility of extracting the features of EMG signals that reflect the subject's intent as control signals.

关键词： Humans Electromyography Tracking Robots Electrooculography Rehabilitation robotics Motion control control systems Feature extraction Muscles

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Real Time Evaluation of Different Types of Bio-neurological Signals

Real Time Evaluation of Different Types of Bio-neurological ...

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2007 IEEE/ICME International Conference on Complex Medical engineering-CME2007(CME2007 第二届国际复合医学工程学术大会)

作者： Tao Zhang Takenao Sugi Masatoshi Nakamura Hiroshi Shibasaki Department of Automation Tsinghua University Beijing 100084 China Department of Advanced Systems Control Engineering Saga University Saga 840-8502 Japan Department of Psychosomatic Medicine Takeda Hospital Kyoto Japan

This paper proposes a real time evaluation method for different types of bio-neurological signals. In this method, multiple types of bio-neurological signals can be automatically processed in a single system in real time, including EEG, EMG, EOG, etc. It can display the wave shapes of these signals, calculate the feature parameters, indicate various kinds of artifacts contaminating in the signals, and so on. Therefore, this method not only can pre-process raw bio-neurological signals online, but also can evaluate the signals based on the user's requirement. The output of qualified bioneurological signals can be possibly adopted to assist doctors to interpret bio-neurological signals for judging the diseases or providing any suggestions to subjects. This method can be functionally extended according to the requirement from users.

关键词： Bio-neurological signals real time evaluation EEG EMG EOG

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