The starting behavior of induction motors and the application of a simulation technique for the prediction of the starting current and torque when switching and reswitching the motor to the supply are addressed. The sensitivity of the starting current and torque to parameter variations is studied. The investigation is performed for different power ratings and design classes. Concurrently practical laboratory measurements are carried out to examine the parameter variations during the staring period. A practical motor model that gives satisfactory results is suggested. Results from simulations performed with this model are shown.<>
{"title":"Effect of induction motor parameter variations on digital computation of transient starting currents and torques","authors":"O. Vaag Thorsen, M. Dalva","doi":"10.1109/IAS.1990.152156","DOIUrl":"https://doi.org/10.1109/IAS.1990.152156","url":null,"abstract":"The starting behavior of induction motors and the application of a simulation technique for the prediction of the starting current and torque when switching and reswitching the motor to the supply are addressed. The sensitivity of the starting current and torque to parameter variations is studied. The investigation is performed for different power ratings and design classes. Concurrently practical laboratory measurements are carried out to examine the parameter variations during the staring period. A practical motor model that gives satisfactory results is suggested. Results from simulations performed with this model are shown.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130145233","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 high-frequency quasi-resonant DC voltage notching inverter derived from a resonant DC link inverter is discussed. The quasi-resonant link circuit provides a DC voltage with resonant notches to the inverter such that inverter switches can switch at zero voltage crossing. Compared to resonant DC link inverters, the size of passive components is reduced. Compared to traditional pulse-width modulation (PWM) inverters, the efficiency and performance are largely improved because high-frequency switching occurs at zero voltage crossing. The resonant voltage notches can be created at any instant, which permits the inverter to operate at standard or optimized PWM control. A least current error square method is proposed to incorporate the quasi-resonant DC voltage notching inverter, resulting in minimum output current ripples. For regenerative-type AC drive operation, a bidirectional current initialization is included in the circuit. The complete system was simulated using PC-SIMNON and fabricated as a laboratory prototype.<>
{"title":"High frequency quasi-resonant DC voltage notching inverter for AC motor drives","authors":"J. Lai, B. Bose","doi":"10.1109/IAS.1990.152337","DOIUrl":"https://doi.org/10.1109/IAS.1990.152337","url":null,"abstract":"A high-frequency quasi-resonant DC voltage notching inverter derived from a resonant DC link inverter is discussed. The quasi-resonant link circuit provides a DC voltage with resonant notches to the inverter such that inverter switches can switch at zero voltage crossing. Compared to resonant DC link inverters, the size of passive components is reduced. Compared to traditional pulse-width modulation (PWM) inverters, the efficiency and performance are largely improved because high-frequency switching occurs at zero voltage crossing. The resonant voltage notches can be created at any instant, which permits the inverter to operate at standard or optimized PWM control. A least current error square method is proposed to incorporate the quasi-resonant DC voltage notching inverter, resulting in minimum output current ripples. For regenerative-type AC drive operation, a bidirectional current initialization is included in the circuit. The complete system was simulated using PC-SIMNON and fabricated as a laboratory prototype.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128927344","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 problems of applying procedures and measurement methods for the control of electrostatic discharge (ESD) are identified for the implementation or improvement of an ESD control program. Adherence to military, industrial, and in-house ESD requirements is difficult because of diverse electrostatic charge sources, erroneous tests, and unknown sensitivities of devices in various configurations due to the inadequacies of the sensitivity classification method (i.e. human body model test). This complicated situation is analyzed to determine ESD procedures and packaging protection limitations. Improved procedures and protection result from considering sensitive devices to be of two distinct classes-voltage sensitive or energy sensitive.<>
{"title":"An overview of ESD process control problems","authors":"G. Baumgartner","doi":"10.1109/IAS.1990.152284","DOIUrl":"https://doi.org/10.1109/IAS.1990.152284","url":null,"abstract":"The problems of applying procedures and measurement methods for the control of electrostatic discharge (ESD) are identified for the implementation or improvement of an ESD control program. Adherence to military, industrial, and in-house ESD requirements is difficult because of diverse electrostatic charge sources, erroneous tests, and unknown sensitivities of devices in various configurations due to the inadequacies of the sensitivity classification method (i.e. human body model test). This complicated situation is analyzed to determine ESD procedures and packaging protection limitations. Improved procedures and protection result from considering sensitive devices to be of two distinct classes-voltage sensitive or energy sensitive.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131030371","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 residual voltage in an induction motor under an interrupted power supply condition is considered. The electromagnetic shock at the end of the motor coil due to the excessive surge current and the mechanical impact due to the greater transient torque are investigated. The case when many induction motors are connected to a common bus is studied. Development of the analytical model and a method of decreasing rapidly the residual voltage are described. Simulation and experimental results are compared and show fair agreement.<>
{"title":"Induction motor residual voltage","authors":"Y. Akiyama","doi":"10.1109/IAS.1990.152160","DOIUrl":"https://doi.org/10.1109/IAS.1990.152160","url":null,"abstract":"The residual voltage in an induction motor under an interrupted power supply condition is considered. The electromagnetic shock at the end of the motor coil due to the excessive surge current and the mechanical impact due to the greater transient torque are investigated. The case when many induction motors are connected to a common bus is studied. Development of the analytical model and a method of decreasing rapidly the residual voltage are described. Simulation and experimental results are compared and show fair agreement.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129254395","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 application of a liquid thermal-bridge system for spot cooling of a fluorescent lamps inside fixtures is described. A thermal bridging system facilitates the convection of heat away from a small area on the lamp to the fixture housing, where is it dissipated to the plenum or surrounding ambient space. This results in reduced minimum lamp wall temperatures with a corresponding increase in light output and system efficacy. Experimental performance data for a range of ambient temperatures is presented, and the overall feasibility and application of using liquid heat sinks in fixtures are discussed.<>
{"title":"The application of a liquid thermal bridge for improving the thermal performance of fluorescence fixtures","authors":"M. Siminovitch, F. Rubinstein","doi":"10.1109/IAS.1990.152464","DOIUrl":"https://doi.org/10.1109/IAS.1990.152464","url":null,"abstract":"The application of a liquid thermal-bridge system for spot cooling of a fluorescent lamps inside fixtures is described. A thermal bridging system facilitates the convection of heat away from a small area on the lamp to the fixture housing, where is it dissipated to the plenum or surrounding ambient space. This results in reduced minimum lamp wall temperatures with a corresponding increase in light output and system efficacy. Experimental performance data for a range of ambient temperatures is presented, and the overall feasibility and application of using liquid heat sinks in fixtures are discussed.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126774683","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 simple adaptive control scheme for position control of an inverter-fed permanent magnet synchronous motor drive is presented. In the proposed control strategy, model reference and variable structure algorithms are combined to provide fast response and robustness. The adaptive control strategy is analyzed. The performance was studied by computer simulation using actual parameters of a 1 kW drive system. Simulation results are given and discussed.<>
{"title":"Adaptive position control of a permanent-magnet synchronous motor drive","authors":"M. Ghribi, H. Le-Huy, P. Viarouge, L. Dessaint","doi":"10.1109/IAS.1990.152254","DOIUrl":"https://doi.org/10.1109/IAS.1990.152254","url":null,"abstract":"A simple adaptive control scheme for position control of an inverter-fed permanent magnet synchronous motor drive is presented. In the proposed control strategy, model reference and variable structure algorithms are combined to provide fast response and robustness. The adaptive control strategy is analyzed. The performance was studied by computer simulation using actual parameters of a 1 kW drive system. Simulation results are given and discussed.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126410590","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 present an experimental and analytical study of the deformations and break-up of large water droplets, approximately 1.5 cm in. diameter, generated in microgravity and subjected to an electric field. The deformations were recorded on films taken with a high-speed camera on two KC-135 flights. The films show that under the electric field forces the droplet extends along the direction of the electric field, forms Taylor cones at the elongated ends, and starts to eject several very small droplets from the cones' tips, before the entire mass breaks up in two or three droplets. The mathematical analysis and computer simulation presented show a successful reproduction of the various stages of the deformation process in time up to the formation of the Taylor cones. The numerical results show that the dynamics of the deformation of the droplet is determined primarily by the electric and inertial forces.<>
{"title":"Dynamics of water droplets break-up in electric fields","authors":"I. Inculet, J. M. Floryan, R. Haywood","doi":"10.1109/28.158849","DOIUrl":"https://doi.org/10.1109/28.158849","url":null,"abstract":"The authors present an experimental and analytical study of the deformations and break-up of large water droplets, approximately 1.5 cm in. diameter, generated in microgravity and subjected to an electric field. The deformations were recorded on films taken with a high-speed camera on two KC-135 flights. The films show that under the electric field forces the droplet extends along the direction of the electric field, forms Taylor cones at the elongated ends, and starts to eject several very small droplets from the cones' tips, before the entire mass breaks up in two or three droplets. The mathematical analysis and computer simulation presented show a successful reproduction of the various stages of the deformation process in time up to the formation of the Taylor cones. The numerical results show that the dynamics of the deformation of the droplet is determined primarily by the electric and inertial forces.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121434574","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}
Capacitance coefficients are measured for a system of three conductors positioned above a horizontal ground plane. The system is used to model the approach of a charged floating conductor (the human body) to a two-conductor system (the electronic system under test) in which either both conductors are floating or one is grounded. Body potentials and energies are calculated for various source/sink geometries and ground plane separations; both primary and secondary discharge conditions are analyzed. The results, based on the measurement of system capacitance coefficients, provide a better understanding of the basic ESD (electrostatic discharge) characteristics of the three-body problem. The information can be applied in the design of electronic systems and is of use in the simulation and analysis of the ESD event.<>
{"title":"ESD characteristics of a three body system including a ground plane","authors":"W. Greason","doi":"10.1109/28.148438","DOIUrl":"https://doi.org/10.1109/28.148438","url":null,"abstract":"Capacitance coefficients are measured for a system of three conductors positioned above a horizontal ground plane. The system is used to model the approach of a charged floating conductor (the human body) to a two-conductor system (the electronic system under test) in which either both conductors are floating or one is grounded. Body potentials and energies are calculated for various source/sink geometries and ground plane separations; both primary and secondary discharge conditions are analyzed. The results, based on the measurement of system capacitance coefficients, provide a better understanding of the basic ESD (electrostatic discharge) characteristics of the three-body problem. The information can be applied in the design of electronic systems and is of use in the simulation and analysis of the ESD event.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"46 10","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114101388","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}
Design options for the V/sub BO/ protection of power thyristors are reviewed. A technique that uses a separate trigger device which provides gate current to the main or power thyristor, both when triggered by light and by avalanche current due to a V/sub BO/-voltage, is described. The development of the gating strategy, evaluation-results, which include characteristics and maximum ratings of the device, and processing of the V/sub BO/ devices are discussed. Conclusions are presented as guides for the next level of design and evaluation of the V/sub BO/-trigger devices.<>
{"title":"V/sub BO/-protection of power thyristors using an external trigger thyristor","authors":"L. O. Eriksson, V. Temple, L. B. Major, H. Mehta","doi":"10.1109/IAS.1990.152408","DOIUrl":"https://doi.org/10.1109/IAS.1990.152408","url":null,"abstract":"Design options for the V/sub BO/ protection of power thyristors are reviewed. A technique that uses a separate trigger device which provides gate current to the main or power thyristor, both when triggered by light and by avalanche current due to a V/sub BO/-voltage, is described. The development of the gating strategy, evaluation-results, which include characteristics and maximum ratings of the device, and processing of the V/sub BO/ devices are discussed. Conclusions are presented as guides for the next level of design and evaluation of the V/sub BO/-trigger devices.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114147781","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}
SPICE modeling of a complete stepper motor system is described. Using a voltage-controlled oscillator to track sine and cosine of rotor angle and using an electrical analog of the mechanical assembly, SPICE simulates interactions between electrical and mechanical subsystems. The simulations confirm the effectiveness of preloading against gear backlash and dead-beating against excitation of mechanical resonances. A method for extracting frequency-domain information from this inherently time-domain model is also discussed.<>
{"title":"SPICE modeling of a stepper motor with its control, drive and load","authors":"J. Chen, D. Gaeiro, E. Stoeckert","doi":"10.1109/IAS.1990.152185","DOIUrl":"https://doi.org/10.1109/IAS.1990.152185","url":null,"abstract":"SPICE modeling of a complete stepper motor system is described. Using a voltage-controlled oscillator to track sine and cosine of rotor angle and using an electrical analog of the mechanical assembly, SPICE simulates interactions between electrical and mechanical subsystems. The simulations confirm the effectiveness of preloading against gear backlash and dead-beating against excitation of mechanical resonances. A method for extracting frequency-domain information from this inherently time-domain model is also discussed.<<ETX>>","PeriodicalId":185839,"journal":{"name":"Conference Record of the 1990 IEEE Industry Applications Society Annual Meeting","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1990-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116702659","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：