A study has been made of the voltage-current characteristics of a wire-plate electrostatic precipitator geometry under clean air conditions. Helical wires have been used as corona electrodes. The studies were conducted with DC and DC superposed on nanosecond pulse. The repetitive pulses with a rise time of the order of nanoseconds were generated from a MARX type impulsive voltage generator. A comparative study of effect of pulse repetition rate, pulse width, and effect of DC bias has been made on the voltage-current characteristics. The obtained results were discussed and compared with previous investigations.<>
{"title":"Voltage-current characteristics of plate type precipitator geometry under combined DC/pulse energizations","authors":"B. Rajanikanth, B. Prabhakar","doi":"10.1109/ias.1991.178318","DOIUrl":"https://doi.org/10.1109/ias.1991.178318","url":null,"abstract":"A study has been made of the voltage-current characteristics of a wire-plate electrostatic precipitator geometry under clean air conditions. Helical wires have been used as corona electrodes. The studies were conducted with DC and DC superposed on nanosecond pulse. The repetitive pulses with a rise time of the order of nanoseconds were generated from a MARX type impulsive voltage generator. A comparative study of effect of pulse repetition rate, pulse width, and effect of DC bias has been made on the voltage-current characteristics. The obtained results were discussed and compared with previous investigations.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121711696","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}
I. Kubo, Y. Ozawa, R. Nakatsuka, A. Shimizu, H. Akagi
An uninterruptible power system (UPS) which consists of a pulse width modulation (PWM) rectifier and inverter with fully digital control is presented. The rating of the UPS is single phase 10 kVA of 200 V input and 200 V/100 V output. The power switching devices of the UPS are insulated gate bipolar transistors (IGBTs) in the PWM rectifier and inverter working at a switching frequency of 14.7 kHz. The instantaneous feedback control of input current and output voltage results in sinusoidal input current and output voltage. Full digital control is achieved in the control circuit of the rectifier and inverter.<>
{"title":"A fully digital controlled UPS using IGBT's","authors":"I. Kubo, Y. Ozawa, R. Nakatsuka, A. Shimizu, H. Akagi","doi":"10.1109/IAS.1991.178364","DOIUrl":"https://doi.org/10.1109/IAS.1991.178364","url":null,"abstract":"An uninterruptible power system (UPS) which consists of a pulse width modulation (PWM) rectifier and inverter with fully digital control is presented. The rating of the UPS is single phase 10 kVA of 200 V input and 200 V/100 V output. The power switching devices of the UPS are insulated gate bipolar transistors (IGBTs) in the PWM rectifier and inverter working at a switching frequency of 14.7 kHz. The instantaneous feedback control of input current and output voltage results in sinusoidal input current and output voltage. Full digital control is achieved in the control circuit of the rectifier and inverter.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124103274","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 design strategy for the combined power filter for a three-phase twelve-pulse thyristor rectifier is proposed. The shunt passive filter, which can minimize the output voltage of the series active filter, is designed and tested in a prototype model. A specially designed shunt passive filter makes it possible to reduce the required rating of the series active filter to 60% compared with a conventional shunt passive filter.<>
{"title":"Design strategy for the combined system of shunt passive and series active filters","authors":"Hideaki Fujita, Hirofumi Akagi","doi":"10.1109/IAS.1991.178344","DOIUrl":"https://doi.org/10.1109/IAS.1991.178344","url":null,"abstract":"A design strategy for the combined power filter for a three-phase twelve-pulse thyristor rectifier is proposed. The shunt passive filter, which can minimize the output voltage of the series active filter, is designed and tested in a prototype model. A specially designed shunt passive filter makes it possible to reduce the required rating of the series active filter to 60% compared with a conventional shunt passive filter.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123994209","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}
This study involves a bearingless induction motor constructed with additional two-pole stator windings. These additional windings can be used to produce radial forces on the rotor shaft. The two-pole winding currents were regulated by radial position control loops to maintain the rotor's position near the stator center. The voltage and current relationships of the two-pole windings were derived from a machine inductance model and equivalent circuits. The influence of secondary circuits was also taken into account. The theoretical values of current, voltage, and radial force were compared with the experimental results. It was found that the two-pole windings need only about 2% of the volt-ampere requirements of the main motor windings.<>
{"title":"No load characteristics of a bearingless induction motor","authors":"A. Chiba, D. T. Power, M. Rahman","doi":"10.1109/IAS.1991.178143","DOIUrl":"https://doi.org/10.1109/IAS.1991.178143","url":null,"abstract":"This study involves a bearingless induction motor constructed with additional two-pole stator windings. These additional windings can be used to produce radial forces on the rotor shaft. The two-pole winding currents were regulated by radial position control loops to maintain the rotor's position near the stator center. The voltage and current relationships of the two-pole windings were derived from a machine inductance model and equivalent circuits. The influence of secondary circuits was also taken into account. The theoretical values of current, voltage, and radial force were compared with the experimental results. It was found that the two-pole windings need only about 2% of the volt-ampere requirements of the main motor windings.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"2014 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128186378","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 Pittsburgh Research Center has completed an investigation of the degree to which various disk materials affect the probability of igniting a methane-air atmosphere using the breakflash machine. Data were generated for estimating currents (resistor or inductor circuits) and voltages (capacitor circuits) associated with a particular ignition level. Further analysis of these data was used to assign hazard levels for each material, with cadmium used as a reference material. From this, a safety factor was associated with each material. Presently, there are no construction requirements with regard to materials of construction. The worst case is always assumed (i.e., cadmium). Laboratory test results confirmed cadmium as the worst-case material among those tested for resistor and inductor circuits but not for capacitor circuits. In fact, aluminum testing illustrated lower ignition voltages than cadmium at 107 and 1310 mu F. For capacitor circuits, little, if any, safety was gained by using certain materials other than cadmium.<>
{"title":"An investigation of the ignition hazards associated with various materials in the breakflash apparatus","authors":"J. Peterson","doi":"10.1109/IAS.1991.178023","DOIUrl":"https://doi.org/10.1109/IAS.1991.178023","url":null,"abstract":"The US Bureau of Mines Pittsburgh Research Center has completed an investigation of the degree to which various disk materials affect the probability of igniting a methane-air atmosphere using the breakflash machine. Data were generated for estimating currents (resistor or inductor circuits) and voltages (capacitor circuits) associated with a particular ignition level. Further analysis of these data was used to assign hazard levels for each material, with cadmium used as a reference material. From this, a safety factor was associated with each material. Presently, there are no construction requirements with regard to materials of construction. The worst case is always assumed (i.e., cadmium). Laboratory test results confirmed cadmium as the worst-case material among those tested for resistor and inductor circuits but not for capacitor circuits. In fact, aluminum testing illustrated lower ignition voltages than cadmium at 107 and 1310 mu F. For capacitor circuits, little, if any, safety was gained by using certain materials other than cadmium.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130947600","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 is completing development of a diagnostic maintenance system as part of its investigation into using expert system techniques to diagnose and predict hydraulic problems on a continuous mining machine. The Bureau has developed an expert knowledge base to diagnose hydraulic problems on a Joy 16CM continuous mining machine. This diagnostic system is interfaced to machine-based sensors which monitor various hydraulic system parameters, such as pressures, flows, temperatures, fluid level, and ferrous debris present in the oil. The status of these parameters is updated periodically and transmitted via a distributed interface to the diagnostic knowledge base. All diagnostic decisions are made based upon the available sensor information. The testing and evaluation plans for this system on the 16CM are outlined.<>
{"title":"Research into a sensor-based diagnostic maintenance expert system for the hydraulics of a continuous mining machine","authors":"J. Mitchell","doi":"10.1109/IAS.1991.178014","DOIUrl":"https://doi.org/10.1109/IAS.1991.178014","url":null,"abstract":"The US Bureau of Mines is completing development of a diagnostic maintenance system as part of its investigation into using expert system techniques to diagnose and predict hydraulic problems on a continuous mining machine. The Bureau has developed an expert knowledge base to diagnose hydraulic problems on a Joy 16CM continuous mining machine. This diagnostic system is interfaced to machine-based sensors which monitor various hydraulic system parameters, such as pressures, flows, temperatures, fluid level, and ferrous debris present in the oil. The status of these parameters is updated periodically and transmitted via a distributed interface to the diagnostic knowledge base. All diagnostic decisions are made based upon the available sensor information. The testing and evaluation plans for this system on the 16CM are outlined.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131101030","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}
Current sensing power MOSFETs (SENSEFETs) provide signals which can be used for current feedback and fast overcurrent protection in converter-fed drives and power supplies. The authors investigate the performance of a SENSEFET used in a DC chopper circuit by obtaining the current sense waveforms. The sense signals contain large switching transients which are to be removed using a special processing circuit. The details of the processing circuit and the waveforms are presented. A current loop is synthesized by feeding back the output of the signal processor.<>
{"title":"Performance analysis and signal processing in a current sensing power MOSFET (SENSEFET)","authors":"S. Yuvarajan, L. Wang","doi":"10.1109/IAS.1991.178050","DOIUrl":"https://doi.org/10.1109/IAS.1991.178050","url":null,"abstract":"Current sensing power MOSFETs (SENSEFETs) provide signals which can be used for current feedback and fast overcurrent protection in converter-fed drives and power supplies. The authors investigate the performance of a SENSEFET used in a DC chopper circuit by obtaining the current sense waveforms. The sense signals contain large switching transients which are to be removed using a special processing circuit. The details of the processing circuit and the waveforms are presented. A current loop is synthesized by feeding back the output of the signal processor.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131029005","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 describe an application program, known as E FATALS, which was developed to facilitate analysis of the Mine Safety and Health Administration database of electrical fatalities in mining. E FATALS in a menu-driven and user-friendly program than can be executed on DOS-based personal computers. The advantages of using E FATALS for performing safety analyses are stated, and some examples of such usage are given.<>
{"title":"E FATALS-a computer program for the analysis of electrocutions in the mining industry","authors":"J. Kohler, A. Gupta","doi":"10.1109/IAS.1991.178022","DOIUrl":"https://doi.org/10.1109/IAS.1991.178022","url":null,"abstract":"The authors describe an application program, known as E FATALS, which was developed to facilitate analysis of the Mine Safety and Health Administration database of electrical fatalities in mining. E FATALS in a menu-driven and user-friendly program than can be executed on DOS-based personal computers. The advantages of using E FATALS for performing safety analyses are stated, and some examples of such usage are given.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129962880","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}
Effective destruction of living cells in liquid by high-voltage pulse application has been confirmed. The survivability of the cells, and the energy efficiency of the cell destruction for various kinds of cells have been measured using different electrode geometries. Using an electrode system of the converged electric field type, reliable energy efficient cell destruction can be realized even for a high conductivity liquid. It is shown that using an intense underwater arc discharge in the rod-rod electrode system, even B. sibtilis (spores), which could never be destroyed by electric field method, can easily be inactivated and P markedly decreased less than 5 cal/cm/sub 3/.<>
{"title":"Inactivation of microorganisms by pulsed high voltage application","authors":"Y. Matsumoto, N. Shioji, T. Satake, A. Sakuma","doi":"10.1109/IAS.1991.178248","DOIUrl":"https://doi.org/10.1109/IAS.1991.178248","url":null,"abstract":"Effective destruction of living cells in liquid by high-voltage pulse application has been confirmed. The survivability of the cells, and the energy efficiency of the cell destruction for various kinds of cells have been measured using different electrode geometries. Using an electrode system of the converged electric field type, reliable energy efficient cell destruction can be realized even for a high conductivity liquid. It is shown that using an intense underwater arc discharge in the rod-rod electrode system, even B. sibtilis (spores), which could never be destroyed by electric field method, can easily be inactivated and P markedly decreased less than 5 cal/cm/sub 3/.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128967627","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}
Recently, it was decided that it might be advantageous to have electric motors small enough to go in human arteries and other small places to do various jobs. The procedure followed was to carefully go from known methods step by step to the desired diameter of one millimeter. Motors were made and tested successively at 4.5 mm, 2.5 mm, 1.5 mm and 1 mm. It turned out that normal motor design methods were applicable, and the main problems were making and handling the tiny pieces. Calculation and very abbreviated tests seem to indicate that smaller motors could be made. This and previous work on very small motor designs seems to indicate that the torque goes down slightly faster than the cube of the diameter.<>
{"title":"A one millimeter electromagnetic motor (.039\")","authors":"P. H. Trickey","doi":"10.1109/IAS.1991.178157","DOIUrl":"https://doi.org/10.1109/IAS.1991.178157","url":null,"abstract":"Recently, it was decided that it might be advantageous to have electric motors small enough to go in human arteries and other small places to do various jobs. The procedure followed was to carefully go from known methods step by step to the desired diameter of one millimeter. Motors were made and tested successively at 4.5 mm, 2.5 mm, 1.5 mm and 1 mm. It turned out that normal motor design methods were applicable, and the main problems were making and handling the tiny pieces. Calculation and very abbreviated tests seem to indicate that smaller motors could be made. This and previous work on very small motor designs seems to indicate that the torque goes down slightly faster than the cube of the diameter.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128202915","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}
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