Taguchi loss function methodology is used to evaluate process improvement economics relating to a minivan rear wheel alignment problem that is presumed to be correctable on the assembly line by application of automation. A customer perspective is presented wherein principal data are obtained from an actual case study. Pertinent factory costs are estimated for illustrative purposes to allow the consideration of a capital expenditure that is justified to minimize loss to society, i.e. the manufacturer and customers. Loss for both is calculated for three alternatives: do nothing; implement 100% product inspection and rework defectives; and implement process improvement automation. A case is made for a new category of justification for capital investments in factory equipment, namely, to increase measured value to customers.<>
{"title":"Factory automation economic justification by Taguchi method: automotive example","authors":"R. L. Horst","doi":"10.1109/IAS.1991.178038","DOIUrl":"https://doi.org/10.1109/IAS.1991.178038","url":null,"abstract":"Taguchi loss function methodology is used to evaluate process improvement economics relating to a minivan rear wheel alignment problem that is presumed to be correctable on the assembly line by application of automation. A customer perspective is presented wherein principal data are obtained from an actual case study. Pertinent factory costs are estimated for illustrative purposes to allow the consideration of a capital expenditure that is justified to minimize loss to society, i.e. the manufacturer and customers. Loss for both is calculated for three alternatives: do nothing; implement 100% product inspection and rework defectives; and implement process improvement automation. A case is made for a new category of justification for capital investments in factory equipment, namely, to increase measured value to customers.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"59 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":"125867836","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 new resonant DC/DC converter topology which operates at a constant frequency and exhibits near zero switching losses is presented. The resonant circuit employed in the converter consists of a series branch and a parallel branch. The components of the series branch are tuned at the operating frequency of the converter. The components of the parallel branch are, however, tuned at a frequency much higher than the operating frequency of the converter. Four capacitors are placed across the switches of the full-bridge. The proposed resonant components shapes the current and voltage waveforms in the converter circuit in such a way that near zero turn-on, turn-off, and snubber losses are obtained while maintaining low voltage stresses across the inverter switches and rectifier diodes. A detailed description of the converter circuit, explaining the operating principle is given.<>
{"title":"A constant frequency resonant DC/DC converter with zero switching losses","authors":"P. Jain","doi":"10.1109/IAS.1991.178368","DOIUrl":"https://doi.org/10.1109/IAS.1991.178368","url":null,"abstract":"A new resonant DC/DC converter topology which operates at a constant frequency and exhibits near zero switching losses is presented. The resonant circuit employed in the converter consists of a series branch and a parallel branch. The components of the series branch are tuned at the operating frequency of the converter. The components of the parallel branch are, however, tuned at a frequency much higher than the operating frequency of the converter. Four capacitors are placed across the switches of the full-bridge. The proposed resonant components shapes the current and voltage waveforms in the converter circuit in such a way that near zero turn-on, turn-off, and snubber losses are obtained while maintaining low voltage stresses across the inverter switches and rectifier diodes. A detailed description of the converter circuit, explaining the operating principle is given.<<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":"126616500","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}
H. Hakata, R. Kurosawa, S. Tatara, C. Lemone, H. Hosoda
It is demonstrated that by properly selecting a suitable cycloconverter-fed AC drive system for a prospective rolling mill one can expect not only an excellent performance and responsive controls, but also a minimum consumption of incoming power and reduction of running energy cost. A noncirculating current cycloconverter drive is the most suitable for large-scale and low-speed drives, such as hot reversing mill main stands, while a circulating current cycloconverter drive is best suited for a tandem cold mill, which requires a high capability of speed control. The system can drive the mill at a quick speed response of omega /sub c/=60 rad/s in a wide speed range. This control performance increases the possibilities for improvements in the gage thickness accuracy control and in the production yield rate.<>
{"title":"Application strategies for AC rolling mill drives","authors":"H. Hakata, R. Kurosawa, S. Tatara, C. Lemone, H. Hosoda","doi":"10.1109/IAS.1991.178006","DOIUrl":"https://doi.org/10.1109/IAS.1991.178006","url":null,"abstract":"It is demonstrated that by properly selecting a suitable cycloconverter-fed AC drive system for a prospective rolling mill one can expect not only an excellent performance and responsive controls, but also a minimum consumption of incoming power and reduction of running energy cost. A noncirculating current cycloconverter drive is the most suitable for large-scale and low-speed drives, such as hot reversing mill main stands, while a circulating current cycloconverter drive is best suited for a tandem cold mill, which requires a high capability of speed control. The system can drive the mill at a quick speed response of omega /sub c/=60 rad/s in a wide speed range. This control performance increases the possibilities for improvements in the gage thickness accuracy control and in the production yield rate.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"37 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":"114012790","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 novel gate drive circuit for insulated gate bipolar transistors (IGBTs) is presented which provides high-speed switching with attention to dV/dt requirements. It also provides pulse-by-pulse overcurrent protection through on-state voltage monitoring while sending out a fault signal to the control circuit. It also incorporates a backup overcurrent protection with shutdown and a trip signal feedback to the control circuit. It provides self-isolation in the event of IGBT destruction, possible self-derived power supply from the IGBT power terminal voltage, and direct mounting (including electrical contacts) in the form of a PCB onto an ISOTOP package IGBT, all resulting in a reliable and modular construction, easy for maintenance. Oscillograms from an experimental chopper circuit using a prototype drive circuit are presented.<>
{"title":"A modular gate drive circuit for insulated gate bipolar transistors","authors":"S. Biswas, B. Basak, K. Rajashekara","doi":"10.1109/IAS.1991.178057","DOIUrl":"https://doi.org/10.1109/IAS.1991.178057","url":null,"abstract":"A novel gate drive circuit for insulated gate bipolar transistors (IGBTs) is presented which provides high-speed switching with attention to dV/dt requirements. It also provides pulse-by-pulse overcurrent protection through on-state voltage monitoring while sending out a fault signal to the control circuit. It also incorporates a backup overcurrent protection with shutdown and a trip signal feedback to the control circuit. It provides self-isolation in the event of IGBT destruction, possible self-derived power supply from the IGBT power terminal voltage, and direct mounting (including electrical contacts) in the form of a PCB onto an ISOTOP package IGBT, all resulting in a reliable and modular construction, easy for maintenance. Oscillograms from an experimental chopper circuit using a prototype drive circuit are presented.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"5 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114111401","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 field investigation of the dynamic roadways and in-vehicle lighting conditions was performed. The variation in ambient lighting levels for drivers in-vehicle while driving was measured. Typical values and variability of lighting levels over time for nine sites in Ann Arbor, Michigan (e.g. rural, suburban, city streets, expressways, etc.) on a cluster near the radio within a 1986 Honda Civic, and the driver's view locations were determined. A sampling rate of 3 to 10 Hz was established for automatically adjusting the control panel lighting level for dynamic lighting conditions during the day and at night. The data obtained from this study are intended to provide photometric information to engineers to design the interior display panels within vehicles equipped with the Intelligent Vehicle Highway System.<>
{"title":"Human factors and dynamic roadways and in-vehicle lighting conditions","authors":"M. Nevvab","doi":"10.1109/IAS.1991.178122","DOIUrl":"https://doi.org/10.1109/IAS.1991.178122","url":null,"abstract":"A field investigation of the dynamic roadways and in-vehicle lighting conditions was performed. The variation in ambient lighting levels for drivers in-vehicle while driving was measured. Typical values and variability of lighting levels over time for nine sites in Ann Arbor, Michigan (e.g. rural, suburban, city streets, expressways, etc.) on a cluster near the radio within a 1986 Honda Civic, and the driver's view locations were determined. A sampling rate of 3 to 10 Hz was established for automatically adjusting the control panel lighting level for dynamic lighting conditions during the day and at night. The data obtained from this study are intended to provide photometric information to engineers to design the interior display panels within vehicles equipped with the Intelligent Vehicle Highway System.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"14 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":"121281052","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 describes a simple gate-controlled circuit for a MOS-controlled thyristor (MCT) in which the frequency, duty cycle, and pulse width are all controllable. The gate pulses generated are used to study the switching characteristics of an MCT connected in a DC chopper. Several experimental waveforms and a study of the variation of switching losses with gate pulse width are presented. It is shown that there is an increase in the switching losses with pulse width. There are also considerable oscillations both in the gate voltage and in the device voltage at higher frequencies, indicating the need for modifications in the drive circuit.<>
{"title":"Gate control circuit and switching characteristics of a MOS controll thyristor (MCT)","authors":"S. Yuvarajan","doi":"10.1109/IAS.1991.178067","DOIUrl":"https://doi.org/10.1109/IAS.1991.178067","url":null,"abstract":"The author describes a simple gate-controlled circuit for a MOS-controlled thyristor (MCT) in which the frequency, duty cycle, and pulse width are all controllable. The gate pulses generated are used to study the switching characteristics of an MCT connected in a DC chopper. Several experimental waveforms and a study of the variation of switching losses with gate pulse width are presented. It is shown that there is an increase in the switching losses with pulse width. There are also considerable oscillations both in the gate voltage and in the device voltage at higher frequencies, indicating the need for modifications in the drive circuit.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"39 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":"121430730","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}
Vibration was once a damaging problem to the fans for the coke emission control system at the Ashland, Kentucky plant of Armco Inc. After evaluation of several ways to correct the problem, Armco elected to install an adjustable speed AC drive system which used the existing motor to control the air flow and to remove the damper, which was the cause of the flow instability and the resultant vibration. The adjustable speed drive system not only corrected the vibration problem, but also increased the operating efficiency of the system and reduced the annual power costs by several thousand dollars in the first year. The authors present the problem, the alternate corrective actions which were evaluated, the system performance after the retrofit, and the design considerations for the adjustable speed drive system. They also address current fan application considerations at Armco and the state-of-the-art technology and hardware for adjustable speed AC drive systems.<>
{"title":"Adjustable speed AC drive for fan vibration control","authors":"J. de Graaff, H. W. Weiss","doi":"10.1109/IAS.1991.178010","DOIUrl":"https://doi.org/10.1109/IAS.1991.178010","url":null,"abstract":"Vibration was once a damaging problem to the fans for the coke emission control system at the Ashland, Kentucky plant of Armco Inc. After evaluation of several ways to correct the problem, Armco elected to install an adjustable speed AC drive system which used the existing motor to control the air flow and to remove the damper, which was the cause of the flow instability and the resultant vibration. The adjustable speed drive system not only corrected the vibration problem, but also increased the operating efficiency of the system and reduced the annual power costs by several thousand dollars in the first year. The authors present the problem, the alternate corrective actions which were evaluated, the system performance after the retrofit, and the design considerations for the adjustable speed drive system. They also address current fan application considerations at Armco and the state-of-the-art technology and hardware for adjustable speed AC drive systems.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"29 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":"120905832","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 magnetic field analysis of the original brushless four-pole three-phase synchronous generator is described. The rotor of the generator consists of short-circuited field coils with diodes. The output voltage can be kept constant by adjusting the stator DC current. To analyze the characteristics of this generator, the direct finite element method with which the values of currents can be directly obtained together with magnetic vector potentials is applied. It is found that the results of this theoretical analysis agree well with the experimental results.<>
{"title":"Analysis of brushless 4-pole three-phase synchronous generator without exciter by finite element method","authors":"S. Nonaka, K. Kesamaru, K. Horita","doi":"10.1109/IAS.1991.178158","DOIUrl":"https://doi.org/10.1109/IAS.1991.178158","url":null,"abstract":"The magnetic field analysis of the original brushless four-pole three-phase synchronous generator is described. The rotor of the generator consists of short-circuited field coils with diodes. The output voltage can be kept constant by adjusting the stator DC current. To analyze the characteristics of this generator, the direct finite element method with which the values of currents can be directly obtained together with magnetic vector potentials is applied. It is found that the results of this theoretical analysis agree well with the experimental results.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"190 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114058570","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}
S. Morimoto, K. Hatanaka, Y. Tong, Y. Takeda, T. Hirasa
A high performance servomotor drive system is described for a salient pole PM motor in which an armature current vector is actively controlled according to load conditions in order to use a reluctance torque effectively, and as a result a large torque can be produced. The control algorithm of the armature current vector is described taking the demagnetization of permanent magnet and the magnetic saturation into account. Characteristics such as torque, power factor, efficiency, power capability, transient response, and so on are examined using computer simulations and experimental results.<>
{"title":"High performance servo drive system of salient pole permanent magnet synchronous motor","authors":"S. Morimoto, K. Hatanaka, Y. Tong, Y. Takeda, T. Hirasa","doi":"10.1109/IAS.1991.178196","DOIUrl":"https://doi.org/10.1109/IAS.1991.178196","url":null,"abstract":"A high performance servomotor drive system is described for a salient pole PM motor in which an armature current vector is actively controlled according to load conditions in order to use a reluctance torque effectively, and as a result a large torque can be produced. The control algorithm of the armature current vector is described taking the demagnetization of permanent magnet and the magnetic saturation into account. Characteristics such as torque, power factor, efficiency, power capability, transient response, and so on are examined using computer simulations and experimental results.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"36 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":"123927153","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 30 kW induction motor drive system based on the field oriented control principle is described. The results of experiments comparing two different flux tracking algorithms are presented. In particular, a hybrid flux tracking/rotor resistance identification method is described which is applicable in situations where a fast rotor resistance identification is required. This is the case where a long idle period (when the lack of rotor current makes identification without transducers mounted on the motor possible) is followed by a demand for torque.<>
{"title":"30 kW asynchronous drive with improved response to rotor resistance variations","authors":"P. Dalton, V. Gosbell","doi":"10.1109/IAS.1991.178197","DOIUrl":"https://doi.org/10.1109/IAS.1991.178197","url":null,"abstract":"A 30 kW induction motor drive system based on the field oriented control principle is described. The results of experiments comparing two different flux tracking algorithms are presented. In particular, a hybrid flux tracking/rotor resistance identification method is described which is applicable in situations where a fast rotor resistance identification is required. This is the case where a long idle period (when the lack of rotor current makes identification without transducers mounted on the motor possible) is followed by a demand for torque.<<ETX>>","PeriodicalId":294244,"journal":{"name":"Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting","volume":"111 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":"124047118","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：