{"title":"A passive current limiter for power semiconductor protection","authors":"M. Iwahara, S. Yamada, F. Dawson, G. Fillion","doi":"10.1109/IAS.1996.559233","DOIUrl":"https://doi.org/10.1109/IAS.1996.559233","url":null,"abstract":"Static power converters are being used increasingly in power system applications. The power semiconductor switches within these converter systems accommodate power system fault overvoltages. Significant cost reductions can be attained by reducing the magnitude of power system fault currents. In this paper, the authors propose the use of a novel passive current limiter to accomplish this task. The limiter consists of two magnetic devices connected in series and in magnetic counter opposition to each other. Each magnetic device consists of three slices of NdFeB permanent magnet material sandwiched between the three end poles of two ferrite E cores. Experimental and finite element results are presented and are found to be in good agreement with each other. The need for 3D modeling in the future is demonstrated. The operating characteristics of the current limiter are experimentally verified using a scaled down version of a power system.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116807730","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":"Effect of geometrical factors on copper loss in high-frequency low-profile transformers","authors":"K. W. Cheng, Y.Q. Hu, D. He, W. K. Mo","doi":"10.1109/IAS.1996.559248","DOIUrl":"https://doi.org/10.1109/IAS.1996.559248","url":null,"abstract":"The relationship between the copper loss and geometrical factors of high-frequency low-profile transformers is in investigated with the aid of finite-element method, and some practical design guidelines, which are useful for minimizing the copper loss, are presented. It has been shown that the winding geometry and arrangement are significant factors to determine the copper loss and leakage inductance; magnetic cores with lumped air-gaps can cause excessive AC loss in the windings; and windings with variable-width turns can have lower AC and DC losses than those with constant-width turns. The sandwich structure, in which the secondary is positioned between the two series-connected portions of the primary, is an effective approach to reduce the copper loss and leakage inductance. Optimal winding thicknesses are given for both the two-layered and sandwich-structured transformers.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116880019","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":"Humidify effect on non-thermal plasma processing for VOCs decomposition","authors":"R. Yamashita, T. Takahashi, T. Oda","doi":"10.1109/IAS.1996.559316","DOIUrl":"https://doi.org/10.1109/IAS.1996.559316","url":null,"abstract":"Humidity effects on surface discharges induced in nonthermal plasma processing for volatile organic compounds (VOCs) decomposition was studied extensively, because reactive OH radicals generated in the plasma are assumed to decompose dilute VOCs contaminated in air. The humidity of sample air contaminated with 1000 ppm CFC-113 was controlled with water bubbling where the water temperatures were 7/spl deg/C, 17/spl deg/C, 45/spl deg/C and 70/spl deg/C. The decomposition efficiency of CFC-113 was a little better in the dry air case. The decomposition efficiency of trichloroethylene was not affected by humidity.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129808263","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. Mizuno, K. Shimizu, K. Yanagihara, K. Kinoshita, K. Tsunoda, H. Kim, S. Katsura
{"title":"Effect of additives and catalysts on removal of nitrogen oxides using pulsed discharge","authors":"A. Mizuno, K. Shimizu, K. Yanagihara, K. Kinoshita, K. Tsunoda, H. Kim, S. Katsura","doi":"10.1109/IAS.1996.559313","DOIUrl":"https://doi.org/10.1109/IAS.1996.559313","url":null,"abstract":"Effect of additives and catalysts has been investigated on NO/sub x/ (including N/sub 2/O) removal using discharge plasma. Additives such as H/sub 2/O, C/sub 2/H/sub 4/ are considered to be the source of OH and CH radicals. Though they are one of the important factors to enhance the NO/sub x/ removal chemical reactions, no systematic experiment has been carried out yet. It was confirmed that the hydrocarbon addition plays a dominant role in the NO/sub x/ removal efficiency compared to the water vapor addition. Effect of catalysts such as Ca(OH)/sub 2/ was investigated, and were found to enhance NO/sub x/ and N/sub 2/O removal efficiency.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128360696","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 and implementation of a tubular motor with Halbach magnet array","authors":"W. Kim, M.T. Berhan, D. Trumper, J. Lang","doi":"10.1109/IAS.1996.557069","DOIUrl":"https://doi.org/10.1109/IAS.1996.557069","url":null,"abstract":"In the machine tool industry, direct-drive linear motor technology is of increasing interest as a means to achieve high acceleration, and to increase reliability. This paper discusses the analysis, design and operating characteristics of a novel ironless tubular linear motor that incorporates a magnet array with a magnetization pattern inspired by the Halbash array used in synchrotron light sources. The advantages of such a motor are that it is free of cogging, has efficient cooling, and has low inductance. The authors derive magnetic field solutions, force relations and commutation laws for the motor. Test results such as thrust measurements and step response are also given to confirm the analysis.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130627796","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":"Application of travelling wave field technique for handling cohesive powders","authors":"W. Machowski, W. Balachandran","doi":"10.1109/IAS.1996.563849","DOIUrl":"https://doi.org/10.1109/IAS.1996.563849","url":null,"abstract":"The main objective of this research is to study the transport phenomena of cohesive powders using travelling wave field technique. This technique has been successfully utilised for transporting and separating noncohesive materials in many applications. In the literature only a limited attention has been paid to the transport of cohesive powder materials using this technique. Cohesive powders are generally much more difficult to transport due to short range molecular forces as well as electrostatic forces. Such forces usually cause agglomeration of particles which may significantly impede the flow. In this study, an optimisation process for selecting appropriate electrodes arrangement for levitation and transportation of a given powder is presented. Computer modelling was used to establish how the shape and geometry of the electrodes influence the transport of the particle for a given size and charge to mass ratio. Based on the modelling results a flat-bed arrangement was constructed and used in the experimental study. Cohesive lactose 150 Mesh powder was successfully dispersed and transported using this panel arrangement. Particle trajectories were examined using a CCD camera with telemicroscopic lenses interfaced with a computer controlled image grabbing system.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130735727","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":"Electronic ballast for high-pressure mercury lamps","authors":"T. Pousset, P. Cussac, G. Zissis, J. Damelincourt","doi":"10.1109/IAS.1996.563866","DOIUrl":"https://doi.org/10.1109/IAS.1996.563866","url":null,"abstract":"A ferromagnetic ballast is generally needed to stabilise a discharge lamp, this ballast is expected to be of small size and with low losses. At the moment the use of resonant converters in the electric energy conversion is rapidly expanding. The soft commutation of the switches limits the commutation losses in the semiconductors and therefore enables high frequency operation, thus the dimensions of the magnetic components (transformer, inductors) are noticeably reduced. For these reasons, a new type of resonant converter, which can provide high power in a selected frequency range is developed. Our ballast equipment is composed of an inverter circuit, having variable switching frequency, a series resonant circuit and a starting capacitor. Switches operate in the frequency range 50 kHz-70 kHz. This device is used in order to supply a 1.3 kW high-pressure mercury discharge lamp. The lamp turns on at 70 kHz and operate in nominal operation mode at 50 kHz.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132390686","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":"Hard drive of high power GTOs: better switching capability obtained through improved gate-units","authors":"H. Gruening, A. Zuckerberger","doi":"10.1109/IAS.1996.559263","DOIUrl":"https://doi.org/10.1109/IAS.1996.559263","url":null,"abstract":"The paper presents the dynamic behavior of a standard high power GTO (CSG 3003-45) during turn-on and off switching transients under hard drive conditions. The high power switching device and its gate-unit were modeled and simulated in Spice and ABBPisces (2D device and circuit simulator) and their performances were predicted. A gate-unit capable to handle up to |dI/sub G//dt|=5 kA//spl mu/s was realized and tremendous betterment of device original specifications (as per data-sheet supplied from the producer) were observed during measurements. Very good agreement between simulation and laboratory findings were notified during turn-on and turn-off transients. This is a good indication of homogeneous operation of all 2000 parallel cells of the segmented GTO.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130223331","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 disturbance torque compensation scheme considering the speed measurement delay [in PM synchronous motors]","authors":"Ki-Hak Hong, K. Nam","doi":"10.1109/IAS.1996.557056","DOIUrl":"https://doi.org/10.1109/IAS.1996.557056","url":null,"abstract":"The average speed detection method involves a speed measurement delay, and the delay may cause a serious stability problem to the unknown load torque observer. The instability can be cured by inserting an artificial delay into the input filtering path of the observer. Also, by utilizing the phase lead compensator concept, the authors propose a method of designing an arbitrary high order Q-filter. Through simulation and experimental results, they have shown that their proposed method yields more stable and improved results than the conventional load torque observer.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"162 8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129201070","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 12-step voltage source inverter control circuit for induction motor drives","authors":"M. Rezwan Khan, A. Al-sammak","doi":"10.1109/IAS.1996.559283","DOIUrl":"https://doi.org/10.1109/IAS.1996.559283","url":null,"abstract":"In this paper it is shown that the maximum number of steps that an inverter can have is 12. As this is closer to the sinusoidal wave form, its harmonic content is less than the usual 6-step one. A 12-step inverter control circuit is presented for Y-loads. The control circuit is constructed using a timer, a module-24 counter, an EPROM and a number of AND gates. The design is simple and economical. As it utilizes digital electronic components only, the control circuit lends itself for miniaturizing for mass production. The circuit also keeps volt/hertz of the inverter constant which is a necessity for induction motor drives. The number of pulses and the ON time of the timer remains unchanged throughout the operating frequency range making the analysis of the motors simpler. Further more the circuit uses pnp-npn transistor pairs which eliminates the base isolation problem of the inverters.","PeriodicalId":177291,"journal":{"name":"IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1996-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121448915","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}