A general linear method is described for controller design for a speed-controlled current-source induction motor (CSIM) operating under two different control strategies: slip frequency control (SFC) and torque angle control (TAC). The designed controller ensures asymptotic stability and satisfactory dynamic response of the electric drive system. Digital simulations of the original nonlinear system operating under the two control concepts were carried out, and the validity of the design was confirmed. Results obtained from the electric drive systems controlled by the two schemes were compared and practical conclusion mentioned.<>
{"title":"Controller design method for CSIM drives operating under different control strategies","authors":"A. Zuckerberger, A. Alexandrovitz","doi":"10.1109/IAS.1988.25086","DOIUrl":"https://doi.org/10.1109/IAS.1988.25086","url":null,"abstract":"A general linear method is described for controller design for a speed-controlled current-source induction motor (CSIM) operating under two different control strategies: slip frequency control (SFC) and torque angle control (TAC). The designed controller ensures asymptotic stability and satisfactory dynamic response of the electric drive system. Digital simulations of the original nonlinear system operating under the two control concepts were carried out, and the validity of the design was confirmed. Results obtained from the electric drive systems controlled by the two schemes were compared and practical conclusion mentioned.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"23 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":"128885548","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 approach for the control of a current-source PWM (pulsewidth-modulated) inverter is proposed to achieve instantaneous current control capability. The scheme provides instantaneous current response in the AC motor by altering the modulation index of the current-source PWM patterns. To achieve this task, optimum programmed PWM patterns with selective elimination of lower-order harmonics in the motor line currents are used. Output filter capacitors are provided to bypass the current harmonics in the inverter output and allow for the instantaneous changes in line currents. This method of control provides sinusoidal output voltages and sinusoidal currents in the AC motor. The scheme guarantees fast response characteristics combined with high-performance steady-state behavior. A design procedure for the current-source PWM and selection of programmed PWM current patterns for a variable-speed situation are illustrated. Selected results are verified experimentally.<>
{"title":"A current source PWM inverter with instantaneous current control capability [AC motors]","authors":"P. Enjeti, P. Ziogas, J. Lindsay","doi":"10.1109/IAS.1988.25171","DOIUrl":"https://doi.org/10.1109/IAS.1988.25171","url":null,"abstract":"A novel approach for the control of a current-source PWM (pulsewidth-modulated) inverter is proposed to achieve instantaneous current control capability. The scheme provides instantaneous current response in the AC motor by altering the modulation index of the current-source PWM patterns. To achieve this task, optimum programmed PWM patterns with selective elimination of lower-order harmonics in the motor line currents are used. Output filter capacitors are provided to bypass the current harmonics in the inverter output and allow for the instantaneous changes in line currents. This method of control provides sinusoidal output voltages and sinusoidal currents in the AC motor. The scheme guarantees fast response characteristics combined with high-performance steady-state behavior. A design procedure for the current-source PWM and selection of programmed PWM current patterns for a variable-speed situation are illustrated. Selected results are verified experimentally.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"1 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":"131267035","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}
Quantum series resonant converters (SRCs), a subset of SRCs operating on optimal conditions, are modeled. It is shown that this type of SRC can be modeled as a buck/boost converter with an equivalent inductor. Operation of SRCs with boost and buck-boost characteristics is proposed. Modeling of these converters is verified through analysis and simulation results. Using these models, the quantum SRCs can be designed to be controlled with advanced closed-loop feedback, with advantages such as low device switching stress, reliable high-frequency operation, and low EMI (electromagnetic interference).<>
{"title":"Modeling of quantum series resonant converters-controlled by integral cycle mode","authors":"G. Joung, C. Rim, G. Cho","doi":"10.1109/IAS.1988.25156","DOIUrl":"https://doi.org/10.1109/IAS.1988.25156","url":null,"abstract":"Quantum series resonant converters (SRCs), a subset of SRCs operating on optimal conditions, are modeled. It is shown that this type of SRC can be modeled as a buck/boost converter with an equivalent inductor. Operation of SRCs with boost and buck-boost characteristics is proposed. Modeling of these converters is verified through analysis and simulation results. Using these models, the quantum SRCs can be designed to be controlled with advanced closed-loop feedback, with advantages such as low device switching stress, reliable high-frequency operation, and low EMI (electromagnetic interference).<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"220 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":"115462424","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 locked rotor torque and instantaneous current and torque waveforms for a switched-reluctance motor (SRM) have been calculated using a two-dimensional finite-element method. The effects of switching the stator winding excitation on and off at different positions of the rotor are included. Experimental results for a 10-hp Oulton switched-reluctance motor are shown. In addition, the authors compare the SRM with a Century electric induction motor of the same rating.<>
{"title":"Prediction of the instantaneous and steady state torque of the switched reluctance motor using the finite element method (FEM)","authors":"H. Moghbelli, G. E. Adams, R. Hoft","doi":"10.1109/IAS.1988.25043","DOIUrl":"https://doi.org/10.1109/IAS.1988.25043","url":null,"abstract":"The locked rotor torque and instantaneous current and torque waveforms for a switched-reluctance motor (SRM) have been calculated using a two-dimensional finite-element method. The effects of switching the stator winding excitation on and off at different positions of the rotor are included. Experimental results for a 10-hp Oulton switched-reluctance motor are shown. In addition, the authors compare the SRM with a Century electric induction motor of the same rating.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"23 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":"124123585","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 major electrical equipment installed at a seamless-tube mill and some of the considerations that influenced its selection and design. The initial design work to rationalize different mill builders' requirements and thus reduce the spares inventory is described. The equipment includes main DC motors and drives totaling some 20 MW for the piercer, mandrel, and stretch reducing mills. Of particular interest is a 1.6 MW low-inertia six-armature DC drive for the mandrel rack. Other equipment includes auxiliary DC drives, variable-frequency drives for roller tables, 15 Hz generating sets, and dry-type cast coil transformers. Control and automation uses eleven programmable controllers for logic sequences and mill automation and eleven microprocessors for operator interface and complex control functions.<>
{"title":"Electrical equipment at a modern seamless tube mill","authors":"J. Cowan, D.S. Rihal, R.R. Smylie","doi":"10.1109/IAS.1988.25210","DOIUrl":"https://doi.org/10.1109/IAS.1988.25210","url":null,"abstract":"A description is given of major electrical equipment installed at a seamless-tube mill and some of the considerations that influenced its selection and design. The initial design work to rationalize different mill builders' requirements and thus reduce the spares inventory is described. The equipment includes main DC motors and drives totaling some 20 MW for the piercer, mandrel, and stretch reducing mills. Of particular interest is a 1.6 MW low-inertia six-armature DC drive for the mandrel rack. Other equipment includes auxiliary DC drives, variable-frequency drives for roller tables, 15 Hz generating sets, and dry-type cast coil transformers. Control and automation uses eleven programmable controllers for logic sequences and mill automation and eleven microprocessors for operator interface and complex control functions.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"1 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":"125898599","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 simulation facility and experimental procedures used for the photometric study and evaluation of office lighting design and system applications are described. This facility was developed to obtain quantitative photometric information on how different office lighting systems and design approaches affect the visual quality and comfort within typical work environments. This facility consists of a 40 ft*50 ft*25 ft space with the capability of controlling ceiling height, floor area, and window size, allowing for the controlled simulation and study of ceiling integrated lighting, furniture integrated task lighting and window aperture daylighting systems. Measurement and study capabilities include a luminance scanner that allows the measurement of the absolute luminance of all surfaces within an occupant's field of view, and a data acquisition system that can record data from photometric sensors at various locations. This information is used to determine illuminance levels, luminance ratios, glare, and task contrast at the work station. The authors discuss a range of lighting studies to illustrate the simulation and measurement capabilities associated with the operation of the laboratory.<>
{"title":"A full scale photometric simulation facility for evaluating the luminous environment in office work applications","authors":"M. Siminovitch, M. Navvab, H. Kowalewski","doi":"10.1109/IAS.1988.25314","DOIUrl":"https://doi.org/10.1109/IAS.1988.25314","url":null,"abstract":"A simulation facility and experimental procedures used for the photometric study and evaluation of office lighting design and system applications are described. This facility was developed to obtain quantitative photometric information on how different office lighting systems and design approaches affect the visual quality and comfort within typical work environments. This facility consists of a 40 ft*50 ft*25 ft space with the capability of controlling ceiling height, floor area, and window size, allowing for the controlled simulation and study of ceiling integrated lighting, furniture integrated task lighting and window aperture daylighting systems. Measurement and study capabilities include a luminance scanner that allows the measurement of the absolute luminance of all surfaces within an occupant's field of view, and a data acquisition system that can record data from photometric sensors at various locations. This information is used to determine illuminance levels, luminance ratios, glare, and task contrast at the work station. The authors discuss a range of lighting studies to illustrate the simulation and measurement capabilities associated with the operation of the laboratory.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"111 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":"130137221","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 characteristics of infinite arrays of equal electrostatic dipoles, which are useful as the limiting cases of finite dipole arrays, are studied. The most important characteristic is the potential of the array, which is obtained by summing the potentials of hundreds, thousands, or even more dipoles to find the result for an infinite array. Linear dipole arrays are considered first, and four examples are presented, with the direction of the dipoles taken first as perpendicular and then parallel to the plane of the array. In addition, dipoles were taken in one direction and than in alternately opposite directions. Similar results for several plane-surface arrays are presented with various dipole directions specified.<>
{"title":"The potential of infinite arrays of electrostatic dipoles","authors":"D. Waidelich","doi":"10.1109/IAS.1988.25291","DOIUrl":"https://doi.org/10.1109/IAS.1988.25291","url":null,"abstract":"The characteristics of infinite arrays of equal electrostatic dipoles, which are useful as the limiting cases of finite dipole arrays, are studied. The most important characteristic is the potential of the array, which is obtained by summing the potentials of hundreds, thousands, or even more dipoles to find the result for an infinite array. Linear dipole arrays are considered first, and four examples are presented, with the direction of the dipoles taken first as perpendicular and then parallel to the plane of the array. In addition, dipoles were taken in one direction and than in alternately opposite directions. Similar results for several plane-surface arrays are presented with various dipole directions specified.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"18 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":"131679812","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 examine the possible structure of the high-frequency link system as a composite DC-to-AC converter, as well as the different topologies for primary and secondary converters. The load-dependent frequency of the self-oscillating primary inverter is examined, and a method is found to synchronize the operation of the direct converter with this varying source frequency. The possible topologies for the bidirectional direct converter are examined, the controller as developed is explained, and the results for a system with 1.5 kW input power at 24 V DC and 220 V, 50 Hz sinusoidal output are presented.<>
{"title":"A high frequency link system with self-oscillating inverter and direct converter using ZTOs","authors":"O. Stielau, J. V. van Wyk","doi":"10.1109/IAS.1988.25144","DOIUrl":"https://doi.org/10.1109/IAS.1988.25144","url":null,"abstract":"The authors examine the possible structure of the high-frequency link system as a composite DC-to-AC converter, as well as the different topologies for primary and secondary converters. The load-dependent frequency of the self-oscillating primary inverter is examined, and a method is found to synchronize the operation of the direct converter with this varying source frequency. The possible topologies for the bidirectional direct converter are examined, the controller as developed is explained, and the results for a system with 1.5 kW input power at 24 V DC and 220 V, 50 Hz sinusoidal output are presented.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"7 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":"126272725","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 two coal-rock interface detector (CID) methods associated with vibrations generated by mining machines and how adaptive signal discrimination (ASD) technology is being used to process these signals. In these CID methods, strata (roof, coal seam, floor) or mining machine vibrations are monitored for the complex signals generated, which vary according to the type of mining machine being used. These signals are then analyzed using sophisticated state-of-the-art ASD technology. It is this advanced signal analysis that distinguishes this approach from those of prior research. The ASD system is initially trained using a database of features extracted from known signals measured under conditions of interest. Subsequently, it uses this database to determine if unknown signals belong to a given condition. Assuming that the ASD system classifies these signals correctly, such a system could have the potential for controlling a mining machine so that it always remains in the coal system.<>
{"title":"Adaptive signal discrimination as applied to coal interface detection","authors":"G. L. Mowrey","doi":"10.1109/IAS.1988.25226","DOIUrl":"https://doi.org/10.1109/IAS.1988.25226","url":null,"abstract":"A description is given of two coal-rock interface detector (CID) methods associated with vibrations generated by mining machines and how adaptive signal discrimination (ASD) technology is being used to process these signals. In these CID methods, strata (roof, coal seam, floor) or mining machine vibrations are monitored for the complex signals generated, which vary according to the type of mining machine being used. These signals are then analyzed using sophisticated state-of-the-art ASD technology. It is this advanced signal analysis that distinguishes this approach from those of prior research. The ASD system is initially trained using a database of features extracted from known signals measured under conditions of interest. Subsequently, it uses this database to determine if unknown signals belong to a given condition. Assuming that the ASD system classifies these signals correctly, such a system could have the potential for controlling a mining machine so that it always remains in the coal system.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"54 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":"126495561","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 PWM (pulsewidth modulation) technique is proposed for a three-phase sine-wave PWM inverter. The pulse width is designed to produce a sine-wave output voltage by numerical calculation based on a geometrical technique. The accuracy of output voltage and the harmonics in an output voltage waveform are discussed and compared with the results of the conventional triangulation method. A modified method is introduced for obtaining a PWM inverter with fluctuating input voltage. The validity of the method is verified in an experiment using a microprocessor-based control system.<>
{"title":"A computative decision of pulse width in three-phase PWM inverter","authors":"S. Funabiki, Y. Sawada","doi":"10.1109/IAS.1988.25138","DOIUrl":"https://doi.org/10.1109/IAS.1988.25138","url":null,"abstract":"A novel PWM (pulsewidth modulation) technique is proposed for a three-phase sine-wave PWM inverter. The pulse width is designed to produce a sine-wave output voltage by numerical calculation based on a geometrical technique. The accuracy of output voltage and the harmonics in an output voltage waveform are discussed and compared with the results of the conventional triangulation method. A modified method is introduced for obtaining a PWM inverter with fluctuating input voltage. The validity of the method is verified in an experiment using a microprocessor-based control system.<<ETX>>","PeriodicalId":274766,"journal":{"name":"Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting","volume":"15 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":"126566411","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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