Browsing by Author "Wu, H"

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Auto-tuning self-commissioning control of a universal drive
(1998)
Tzou, YY
;
Wu, H
;
Lin, SY
;
Lin, JY
;
電控工程研究所
This paper presents a systematic design procedure for the auto-tuning self-commissioning (ATSC) control of a universal drive. The ATSC controller consists of five major parts: a current vector controller (CVC), a field-oriented vector controller (FVC), a servo loop controller (SLC), a self-commissioning controller (SCC), and an auto-tuning controller (ATC). The developed universal drive can be programmed to operate as a general-purpose adjustable speed inverter drive, a vector-controlled sensorless induction drive, a de servo drive, a permanent-magnet sc servo drive, or an induction servo drive. The concept and architecture for the future development of universal drives are studied in this paper. We also illustrate some experimental studies of the developed universal drive in application to the ATSC control of an induction motor with unknown motor parameters.
DSP-based rotor time constant identification and slip gain auto-tuning for indirect vector-controlled induction drives
(1996)
Tzou, YY
;
Yeh, ST
;
Wu, H
;
交大名義發表
;
電控工程研究所
This paper proposes a systematic rotor time constant identification and auto-tuning scheme for vector-controlled induction drives with unknown rotor time constant. The theoretical aspects and practical implementation issues of the proposed scheme have been described. The proposed scheme has been realized using dual-DSP based software control techniques. Experimental studies have been carried out to illustrate the decoupling control effect of the proposed rotor time constant auto-tuning scheme.
Dual DSP based fully digital control of an AC induction motor
(1996)
Tzou, YY
;
Tsai, MF
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Lin, YF
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Wu, H
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電控工程研究所
Evaluation of PTFE nanoemulsion as a low dielectric constant material ILD
(1997)
Sun, SC
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Chiang, YC
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Rosenmayer, CT
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Teguh, J
;
Wu, H
Polytetrafluoroethylene (PTFE) has been studied as a low dielectric constant material for ULSI. A novel nanoparticle dispersion of PTFE was developed that permits the spin-coat deposition of PTFE with a thickness range of 0.2 to 1.5 mu m. These PTFE nanoemulsions are aqueous emulsions containing sub-50 nm size PTFE particles and surfactant that are thermodynamically stable, optically clear, and have low viscosity and surface tension. The films cast from this nanoemulsion are uniform in thickness with a standard deviation of < 2%. From FTIR spectra, significant amounts of C-F bonds (1153 cm(-1) and 1211 cm(-1)) are detected in the films. The index of refraction from ellipsometry measurement is about 1.35 and the dielectric constant measured from high frequency C-V curves is about 1.85. The dielectric strength is about 170 V/mu m. TGA data indicates a weight loss rate of less than 0.25%/hr. at 425 degrees C. The moisture absorption is less than 0.01%. After sintering, the films are extremely resistant to chemical attack by sulfuric acid, buffered HF, and positive photoresist developer. The etch rate in an oxygen plasma at 30 W is around 200 nm/min. Stud pull tests indicate good adhesion to SiO2, Al, and Cu. Results of thermal, dielectric, chemical, and adhesion tests indicate that these PTFE films have potential for use as an integrated circuit dielectric material.
Sensorless control of induction motors with on-line rotor time constant adaptation
(1998)
Lin, SY
;
Wu, H
;
Tzou, YY
;
電控工程研究所
;
Institute of Electrical and Control Engineering
This paper presents a novel vector control scheme for the sensorless control of induction motors with on-line rotor time constant adaptation. The motor speed can be estimated using only phase currents and de-link voltage. An adaptive voltage compensation scheme is proposed to compensate nonlinearities resulted by the PWM inverter and eliminate time delay of the sensing filters. The proposed on-line rotor time constant adaptation scheme is developed from a power transfer parameter identification algorithm to reduce sensitivity due to parameter mismatch and environment change. The proposed auto-tuning sensorless control scheme has been realized using a single-chip DSP controller (TMS320C14) from Texas Instruments. Experimental results reveals the proposed auto-tuning sensorless control scheme can achieve fast transient response and maintain a wide speed control range.