A novel methodology which is convenient for the design of optimal sliding-mode control for an asynchronous machine drive is developed. A suitable model of the induction machine control system, incorporating the counter-EMF (electromotive force) under field orientation, is presented. Analytic solutions for the optimal switching vector C, and the feedback matrix, L in unit-vector sliding-mode control are obtained. The optimal synthesis is directly related to the desired system specifications in the time domain without the necessity of solving the Riccati equation or complicated matrix equations. This greatly simplifies the conventional complicated design procedure and improves the design quality. Simulation and experimental results verify the optimal design.<>
{"title":"Optimal sliding mode control of asynchronous machine speed with state feedback","authors":"J. Zhang, T. H. Barton","doi":"10.1109/IAS.1988.25083","DOIUrl":"https://doi.org/10.1109/IAS.1988.25083","url":null,"abstract":"A novel methodology which is convenient for the design of optimal sliding-mode control for an asynchronous machine drive is developed. A suitable model of the induction machine control system, incorporating the counter-EMF (electromotive force) under field orientation, is presented. Analytic solutions for the optimal switching vector C, and the feedback matrix, L in unit-vector sliding-mode control are obtained. The optimal synthesis is directly related to the desired system specifications in the time domain without the necessity of solving the Riccati equation or complicated matrix equations. This greatly simplifies the conventional complicated design procedure and improves the design quality. Simulation and experimental results verify the optimal design.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"154 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121302554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Automation of longwall roof supports can be used as a tool to increase coal mine safety and productivity. To determine the value of this tool, both in terms of safety and productivity, the capabilities of roof support electronic control systems supplied by four manufacturers were reviewed. In addition to the system capabilities, present uses of the systems, system reliability, and an evolution of the electrohydraulic shield are discussed.<>
{"title":"Automatic advancement of longwall shields","authors":"M. Toothman","doi":"10.1109/IAS.1988.25218","DOIUrl":"https://doi.org/10.1109/IAS.1988.25218","url":null,"abstract":"Automation of longwall roof supports can be used as a tool to increase coal mine safety and productivity. To determine the value of this tool, both in terms of safety and productivity, the capabilities of roof support electronic control systems supplied by four manufacturers were reviewed. In addition to the system capabilities, present uses of the systems, system reliability, and an evolution of the electrohydraulic shield are discussed.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115857047","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Ohkubo, S. Hamasaki, Y. Nomoto, J. Chang, T. Adachi
The effect of corona wire surface temperature on ozone generation in an air-cleaning electrostatic precipitator is studied experimentally. The results show that significant ozone concentrations are only observed in a narrow region near downstream of the corona wire for positive coronas. From surface temperature measurements using infrared imaging, it is observed that the heat generated by corona discharge alone only increases the surface temperature of corona wire by few centigrades. Ozone generated by corona discharges can be significantly decreased by external heating of the wire.<>
{"title":"The effect of corona wire heating on the ozone generations in an air cleaning electrostatic precipitator","authors":"T. Ohkubo, S. Hamasaki, Y. Nomoto, J. Chang, T. Adachi","doi":"10.1109/IAS.1988.25279","DOIUrl":"https://doi.org/10.1109/IAS.1988.25279","url":null,"abstract":"The effect of corona wire surface temperature on ozone generation in an air-cleaning electrostatic precipitator is studied experimentally. The results show that significant ozone concentrations are only observed in a narrow region near downstream of the corona wire for positive coronas. From surface temperature measurements using infrared imaging, it is observed that the heat generated by corona discharge alone only increases the surface temperature of corona wire by few centigrades. Ozone generated by corona discharges can be significantly decreased by external heating of the wire.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117348635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An examination is made of modifications possible in GTO (gate-turn-off) specifications as a result of application in soft switching topologies. Turn-off is characterized as a function of (dv/dt, di/dt) controlled by the external resonant elements and gate drive circuits. Turn-on is characterized for low-voltage switching and external gate drive circuit influence. Device interaction with the various operating modes of the soft switching topologies is examined.<>
{"title":"Characterization of GTOs for soft switching applications","authors":"G. Skibinski, D. Divan","doi":"10.1109/IAS.1988.25130","DOIUrl":"https://doi.org/10.1109/IAS.1988.25130","url":null,"abstract":"An examination is made of modifications possible in GTO (gate-turn-off) specifications as a result of application in soft switching topologies. Turn-off is characterized as a function of (dv/dt, di/dt) controlled by the external resonant elements and gate drive circuits. Turn-on is characterized for low-voltage switching and external gate drive circuit influence. Device interaction with the various operating modes of the soft switching topologies is examined.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115544444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The authors assert that previously available definitions of a brushless DC motor are inadequate to distinguish it from other types of brushless motors in the industry. A formal definition of a brushless DC motor is proposed. The definition includes the components of the motor and the types of circuits to energize the stator windings.<>
{"title":"Definition of the brushless DC motor","authors":"A. Kusko, S. Peeran","doi":"10.1109/IAS.1988.25036","DOIUrl":"https://doi.org/10.1109/IAS.1988.25036","url":null,"abstract":"The authors assert that previously available definitions of a brushless DC motor are inadequate to distinguish it from other types of brushless motors in the industry. A formal definition of a brushless DC motor is proposed. The definition includes the components of the motor and the types of circuits to energize the stator windings.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114636864","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Chopper-driven operation of a conventional, series-connected DC machine is examined for the purpose of studying operating efficiency of the chopper circuit and DC machine. After expressions are developed for the steady-state circuit waveforms, component loss models are developed, and losses predicted for differing values of switching frequency and DC input voltage to the chopper circuit. Results show that most efficient operation of the chopper circuit and DC machine occurs with high-frequency operation.<>
{"title":"Effects of switching frequency and input voltage on efficiency of chopper-controlled series-connected DC machines","authors":"T. H. Sloane","doi":"10.1109/IAS.1988.25057","DOIUrl":"https://doi.org/10.1109/IAS.1988.25057","url":null,"abstract":"Chopper-driven operation of a conventional, series-connected DC machine is examined for the purpose of studying operating efficiency of the chopper circuit and DC machine. After expressions are developed for the steady-state circuit waveforms, component loss models are developed, and losses predicted for differing values of switching frequency and DC input voltage to the chopper circuit. Results show that most efficient operation of the chopper circuit and DC machine occurs with high-frequency operation.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127171444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
T. Undeland, A. Petterteig, G. Hauknes, A. K. Adnanes, S. Garberg
RC snubbers must be used for limiting the overvoltages at the diode or thyristor reverse recovery transients. This is true for the application range from line frequency conversion to the output rectifiers in switched-mode DC power supplies. An insight into the mechanism of the turn-off waveforms is obtained by simulations and calculations, and the tradeoffs between overvoltages and losses are presented. An easy-to-use nomogram for the selection of the snubber components is given. A computer program dedicated for power electronic circuit analysis under development, KREAN, is used for the simulations, and is briefly described.<>
{"title":"Diode and thyristor turn-off snubbers simulation by KREAN and an easy to use design algorithm","authors":"T. Undeland, A. Petterteig, G. Hauknes, A. K. Adnanes, S. Garberg","doi":"10.1109/IAS.1988.25131","DOIUrl":"https://doi.org/10.1109/IAS.1988.25131","url":null,"abstract":"RC snubbers must be used for limiting the overvoltages at the diode or thyristor reverse recovery transients. This is true for the application range from line frequency conversion to the output rectifiers in switched-mode DC power supplies. An insight into the mechanism of the turn-off waveforms is obtained by simulations and calculations, and the tradeoffs between overvoltages and losses are presented. An easy-to-use nomogram for the selection of the snubber components is given. A computer program dedicated for power electronic circuit analysis under development, KREAN, is used for the simulations, and is briefly described.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127250577","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The US Bureau of Mines previously constructed a portable meter based on optical reflectivity for measuring the concentration of rock dust in rock dust-coal dust mixtures. This early design was accurate to within +or-2 wt.% rock dust for mixtures whose rock dust concentration was between 30 wt.% and 100 wt.%. Below 30 wt.% rock dust, the meter exhibited poor accuracy. The Bureau researchers have redesigned the meter based on a theory for optical reflectivity of binary dust mixtures. This new meter was tested against both laboratory-prepared coal-dust-rock-dust mixtures and samples taken from various coal mines and found to be accurate to +or-2-wt.% rock dust from 0 wt.% to 100 wt.%. The meter also has a lower power consumption than the previous model (which translates into longer battery life between charges), has fewer internal and external adjustments, is lighter in weight and can be held comfortably in one hand. It can be readily field calibrated.<>
{"title":"Analog optical rock dust meter","authors":"T. Woods, M. Sapko, H. Perlee","doi":"10.1109/IAS.1988.25225","DOIUrl":"https://doi.org/10.1109/IAS.1988.25225","url":null,"abstract":"The US Bureau of Mines previously constructed a portable meter based on optical reflectivity for measuring the concentration of rock dust in rock dust-coal dust mixtures. This early design was accurate to within +or-2 wt.% rock dust for mixtures whose rock dust concentration was between 30 wt.% and 100 wt.%. Below 30 wt.% rock dust, the meter exhibited poor accuracy. The Bureau researchers have redesigned the meter based on a theory for optical reflectivity of binary dust mixtures. This new meter was tested against both laboratory-prepared coal-dust-rock-dust mixtures and samples taken from various coal mines and found to be accurate to +or-2-wt.% rock dust from 0 wt.% to 100 wt.%. The meter also has a lower power consumption than the previous model (which translates into longer battery life between charges), has fewer internal and external adjustments, is lighter in weight and can be held comfortably in one hand. It can be readily field calibrated.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127418107","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The author presents work on a high-frequency, high-power GTO (gate-turn-off) switch operated in the cascode configuration. This configuration is shown to have considerable advantages over conventionally gated GTO switches. These include much reduced turn-off times and snubberless operation, and hence, the ability to operate at increased switching frequency. The major limit on switching frequency is shown to be tail losses; this phenomenon is studied in some detail.<>
{"title":"Switching behaviour of GTO cascode switches","authors":"R. Fletcher","doi":"10.1109/IAS.1988.25129","DOIUrl":"https://doi.org/10.1109/IAS.1988.25129","url":null,"abstract":"The author presents work on a high-frequency, high-power GTO (gate-turn-off) switch operated in the cascode configuration. This configuration is shown to have considerable advantages over conventionally gated GTO switches. These include much reduced turn-off times and snubberless operation, and hence, the ability to operate at increased switching frequency. The major limit on switching frequency is shown to be tail losses; this phenomenon is studied in some detail.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127583490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A description is given of a 5 kV, 300 A, variable DC source. This source will be used to determine the short-circuit impedances of HVDC (high-voltage direct-current) links. The converter is composed of four eight-thyristor bridges connected in series in a 24-pulse arrangement. The triggering pulses are transmitted to the thyristors by fibre-optic cables.<>
{"title":"A 5 kV, 1.5 MW, variable DC source","authors":"G. Olivier, N. Shankar","doi":"10.1109/IAS.1988.25179","DOIUrl":"https://doi.org/10.1109/IAS.1988.25179","url":null,"abstract":"A description is given of a 5 kV, 300 A, variable DC source. This source will be used to determine the short-circuit impedances of HVDC (high-voltage direct-current) links. The converter is composed of four eight-thyristor bridges connected in series in a 24-pulse arrangement. The triggering pulses are transmitted to the thyristors by fibre-optic cables.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"20 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1988-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127060805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：