{"title":"Pulse width modulated series resonant converter","authors":"E. daSilva, G. Ledwich, M. Aydemir, T. Lipo","doi":"10.1109/IAS.1992.244322","DOIUrl":"https://doi.org/10.1109/IAS.1992.244322","url":null,"abstract":"A pulse-width-modulated (PWM) extension of the series resonant converter is presented which reduces the dead time and improves the modulation strategy of this type of converter. With the addition of one thyristor and one diode to the 12 thyristors of a series resonant converter, pulses of link current of arbitrary width can be created. Simulations show that good waveform quality can be achieved, and experimental results also show a reduction in the effective dead time. The proposed control scheme has the following advantages over previous methods: inverter switching and external PWM signals can be synchronized; high-frequency DC link current regulation remains possible, allowing line current power factor control; and device stresses are typically lower than in the normal series resonant DC link converter when a PWM technique is employed.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122228316","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}
{"title":"A unity power factor forward converter","authors":"D. Divan, G. Venkataramanan, C. Chen","doi":"10.1109/IAS.1992.244332","DOIUrl":"https://doi.org/10.1109/IAS.1992.244332","url":null,"abstract":"A novel means of obtaining sinusoidal, unity power factor input currents in switched mode power supplies using minimum additional components is presented. The converter is topologically equivalent to a boost converter cascaded by a forward power converter, but is realized using only a single power stage. A detailed analysis of the operation is presented. A constant frequency current mode control provides excellent transient performance at the output and sinusoidal input currents at the input. Various tradeoffs involved in the design of the converter elements and control parameters are discussed in depth. All the results are backed up by experimental waveforms from a laboratory converter.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115284569","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}
{"title":"Fault monitoring and diagnosis in mining equipment: current and future developments","authors":"Joseph Sottile, Lawrence E. Holloway","doi":"10.1109/IAS.1992.244201","DOIUrl":"https://doi.org/10.1109/IAS.1992.244201","url":null,"abstract":"The authors survey monitoring and diagnosis technologies which offer opportunities for improving equipment availability in mining. They briefly present a framework for comparing and contrasting different techniques, and examine the application of expert systems and knowledge-based methods to mining applications. Model-based methods are discussed from the viewpoint of both analytical models and qualitative models. Neural nets and other pattern recognition techniques are described. The special problems of monitoring and diagnosis that mining poses are discussed, and the relative benefits of the various methods are summarized.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116683921","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}
{"title":"A new algorithm for sensorless operation of permanent magnet motors","authors":"N. Ertugrul, P. Acarnley","doi":"10.1109/IAS.1992.244365","DOIUrl":"https://doi.org/10.1109/IAS.1992.244365","url":null,"abstract":"The authors propose and investigate a novel algorithm for shaft position sensorless operation of permanent magnet motors, based on flux linkage and line current estimation. Measured line current and terminal voltage are used to estimate the flux linkage of the motor. The algorithm has a two current-loop structure, with the outer loop used to correct the position and the inner loop used to correct the estimated flux linkage. The theoretical basis of the algorithm and the individual definition of the system blocks are explained. Dependencies on motor parameters and measurement errors are discussed to show the effectiveness of the method using real data. The authors present a wide range of computed and experimental results, demonstrating the reliability of the method even during acceleration of the motor from rest.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124936790","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}
{"title":"Dynamic relaxation time measuring system for powders and liquids","authors":"I. Inculet","doi":"10.1109/IAS.1992.244390","DOIUrl":"https://doi.org/10.1109/IAS.1992.244390","url":null,"abstract":"With the increasing industrial use of electrostatic systems to coat surfaces, the relaxation time constants of the powder which is being applied electrostatically is a key intrinsic property of the coating material. The measuring system described involves: a powder compacting unit with a vibrator, a high-voltage power supply for corona charging, and an electric flux-decay-versus-time monitoring electrometer. The system allows evaluation of a realistic relaxation time constant, particularly for packed powder, from various levels of charge. To substantiate the operation of the system, tests results are presented for sugar, polyethylene, Arizona road dust as well as for a liquid dielectric transformer oil.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122833991","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}
{"title":"High-power density three-phase CVCF sinewave power conditioner with new quasi-resonant DC link and single-phase high-frequency transformer link","authors":"H. Yonemori, K. Munetou, M. Nakaoka","doi":"10.1109/IAS.1992.244325","DOIUrl":"https://doi.org/10.1109/IAS.1992.244325","url":null,"abstract":"A newly developed high-performance 3 phi CVCF power conversion conditioner incorporating a novel quasi-resonant DC link (QRDCL) single-phase inverter with pulse width modulation (PWM) function and high-frequency AC transformer linked cycloconverter topology is presented. The operating characteristics of the proposed QRDCL inverter are discussed on the basis of computer-aided simulation results. In order to achieve a significant improvement in high performance and quick control response, a specially designed voltage pulse distributed vector control modulation scheme is introduced employing a digital signal processing software-based control implementation.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"330 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133570897","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}
{"title":"A physical GTO model for circuit simulation","authors":"D. Metzner, D. Schroder","doi":"10.1109/IAS.1992.244429","DOIUrl":"https://doi.org/10.1109/IAS.1992.244429","url":null,"abstract":"Purely based on semiconductor physics, a nonquasistatic gate turn-off thyristor (GTO) model for network simulators is developed. Since the basic semiconductor equations can only be solved by CPU-time-consuming 2-D device simulations (e.g. by PISCES), this approach is not suited for the simulation of topologies. But taking advantage of the device understanding gained from 2-D device simulations (dynamics of carrier concentrations) and experimental results, the partial differential equations can be reduced to a system of ordinary differential equations (state equations). The central part of the model is a segmentation approach to solve the diffusion equation for charge carriers in the injected regions. Thus, only physical and geometric device parameters are necessary in order to adjust the model to a specific device. Although the proposed model is one-dimensional, it allows the simulation of important dynamic characteristics such as current tail, dynamic avalanche, and storage time in a complex circuit surrounding.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121760248","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}
{"title":"Analysis of new brushless self-excited single-phase synchronous generator by finite element method","authors":"S. Nonaka, K. Kesamaru","doi":"10.1109/IAS.1992.244294","DOIUrl":"https://doi.org/10.1109/IAS.1992.244294","url":null,"abstract":"An analysis of a novel brushless self-excited single-phase generator is presented. The rotor of the generator consists of a short-circuited field coil with a diode. The output voltage can be near constant for a wide range of load without AVR. In order to establish the design criterion of this generator, a magnetic field analysis is carried out. It is found that the theoretical results agree with the experimental ones. This generator is very simple, robust and maintenance-free. It is useful as a maintenance-free constant-speed generator.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131920032","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}
{"title":"A completely isolated three-phase to three-phase induction motor/induction generation power conversion system","authors":"I. Alan, T. Lipo","doi":"10.1109/IAS.1992.244440","DOIUrl":"https://doi.org/10.1109/IAS.1992.244440","url":null,"abstract":"Two squirrel cage induction machines interconnected via a parallel resonant high-frequency AC link and associated switching pulse density modulated (PDM) converters are investigated, one operating as a generator and the other as a motor. The real power of the generator is controlled so as to maintain the proper link voltage and match the power between the input and output. Current regulated PDM converters operating via field-oriented controllers are used to control both induction machines. A zero voltage switching technique is utilized with the associated PDM converters. Low harmonic distortion waveforms have been obtained both at the input and at the output due to the 40 kHz high switching frequency. Link voltage buildup and regulation techniques are investigated. Computer simulation demonstrates the feasibility of the proposed system.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134219357","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}
{"title":"Robust field oriented induction motor drives based on disturbance torque estimation without rotational transducers","authors":"H. Kubota, K. Matsuse","doi":"10.1109/IAS.1992.244346","DOIUrl":"https://doi.org/10.1109/IAS.1992.244346","url":null,"abstract":"Robust control methods of electric machines based on the disturbance torque estimation have been proposed. The disturbance torque is estimated from the measured speed or position of the motor when a rotational transducer can be mounted. However, the transducers cannot be mounted in some cases, such as motor drives in a hostile environment or high-speed motor drives. Therefore, a novel method for estimating the disturbance torque of an induction motor without rotational transducers is presented, along with robust field-oriented induction motor drives based on this method. The effectiveness of the feedback of the estimated disturbance torque without rotational transducers is demonstrated through experimental verifications.<<ETX>>","PeriodicalId":110710,"journal":{"name":"Conference Record of the 1992 IEEE Industry Applications Society Annual Meeting","volume":"93 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1992-10-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134505753","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}