Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.970713
Zhang Xuxiu, Chen Ruyi
A perfect simulation model of a DC motor double loop speed control system is presented using SIMULINK software. The current and speed in the starting process and the dynamic speed drop was observed through running simulation of this model. Some interesting results were obtained. It is discovered that observed value of speed overshoot is very different from its calculated value. The reason of this phenomenon was analyzed, and the computation method of speed overshoot value was called in question.
{"title":"Digital simulation of DC double loops speed control system and to call a computation method of speed overshoot value in question","authors":"Zhang Xuxiu, Chen Ruyi","doi":"10.1109/ICEMS.2001.970713","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970713","url":null,"abstract":"A perfect simulation model of a DC motor double loop speed control system is presented using SIMULINK software. The current and speed in the starting process and the dynamic speed drop was observed through running simulation of this model. Some interesting results were obtained. It is discovered that observed value of speed overshoot is very different from its calculated value. The reason of this phenomenon was analyzed, and the computation method of speed overshoot value was called in question.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132323136","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.971893
J. Mukosiej
The paper presents the problem of calculating the dependence of temperature of different parts of electric machines on changes of thermal resistances in the network branches. The method of equivalent thermal networks and the method of thermal coefficients, whose principles are shown in the paper, were used for analysis. The analysis is illustrated by examples of calculation concerning a totally enclosed motor with a ribbed frame. The calculation example serves to illustrate the dependence of temperature on resistances and to compare the effect of change of different resistances on heating of different machine parts.
{"title":"Effect of thermal resistances on value and temperature distribution of electric machines","authors":"J. Mukosiej","doi":"10.1109/ICEMS.2001.971893","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971893","url":null,"abstract":"The paper presents the problem of calculating the dependence of temperature of different parts of electric machines on changes of thermal resistances in the network branches. The method of equivalent thermal networks and the method of thermal coefficients, whose principles are shown in the paper, were used for analysis. The analysis is illustrated by examples of calculation concerning a totally enclosed motor with a ribbed frame. The calculation example serves to illustrate the dependence of temperature on resistances and to compare the effect of change of different resistances on heating of different machine parts.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129111211","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.970617
Zheng Ping, W. Mingyu
This paper evaluates detuning in steady-state operation, caused by iron loss, in the MRAC based sensorless rotor flux oriented induction machine. It is shown that typical speed estimation error in the base speed region, purely due to iron loss, is 2 to 3 rpm for a 4 kW, four-pole, 50 Hz machine.
{"title":"Impact of iron loss on speed estimation accuracy in reactive power MRAC based sensorless rotor flux oriented induction machines","authors":"Zheng Ping, W. Mingyu","doi":"10.1109/ICEMS.2001.970617","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970617","url":null,"abstract":"This paper evaluates detuning in steady-state operation, caused by iron loss, in the MRAC based sensorless rotor flux oriented induction machine. It is shown that typical speed estimation error in the base speed region, purely due to iron loss, is 2 to 3 rpm for a 4 kW, four-pole, 50 Hz machine.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134476922","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.971897
Liu Cong-wei, Weng Haiqing, Sun Xudong, Li Fahai
This paper presents the small signal linearization modeling and eigenvalue analysis of a doubly-fed induction motor vector control system. The analytic condition of stability is given and the results verified by simulation.
{"title":"Research of stability of double fed induction motor vector control system","authors":"Liu Cong-wei, Weng Haiqing, Sun Xudong, Li Fahai","doi":"10.1109/ICEMS.2001.971897","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971897","url":null,"abstract":"This paper presents the small signal linearization modeling and eigenvalue analysis of a doubly-fed induction motor vector control system. The analytic condition of stability is given and the results verified by simulation.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133290200","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.971857
Liu Kefu
This paper discusses the different effects of conducting and magnetic shields on the circuit inductance, which are of significance in pulsed power technology (PPT). The effect can be used as a generic method to guide the design of the special electrical machines called compensated pulsed alternators (compulsator or CPA) and improve the power output. With the shield technique, the internal inductance of a CPA is reduced greatly to tens of micro-henry making Possible very high current and power output when the CPA discharges. The CPA realizes a most efficient and compact pulsed power supply which can meet rapidly increasing need for military purposes and special industrial uses.
{"title":"Effect of a shield on the inductance of a conductor and its application to a compensated pulsed alternator","authors":"Liu Kefu","doi":"10.1109/ICEMS.2001.971857","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971857","url":null,"abstract":"This paper discusses the different effects of conducting and magnetic shields on the circuit inductance, which are of significance in pulsed power technology (PPT). The effect can be used as a generic method to guide the design of the special electrical machines called compensated pulsed alternators (compulsator or CPA) and improve the power output. With the shield technique, the internal inductance of a CPA is reduced greatly to tens of micro-henry making Possible very high current and power output when the CPA discharges. The CPA realizes a most efficient and compact pulsed power supply which can meet rapidly increasing need for military purposes and special industrial uses.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133619930","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.971787
Zhimei Chen, Jing-gang Zhang, Zeng Jianchao
A new sliding mode control method is presented in this article for AC servo system. Combining fuzzy control and sliding mode control, the chattering of sliding mode control is solved. Introducing an integral element, the stable-state precision is enhanced. The sliding surface designed by means of this method is a time-varied one, which has powerful robustness to parameter variations and external disturbances. Simulation study results show that this method is correct and effective.
{"title":"A new method of sliding mode control and application to AC servo system","authors":"Zhimei Chen, Jing-gang Zhang, Zeng Jianchao","doi":"10.1109/ICEMS.2001.971787","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971787","url":null,"abstract":"A new sliding mode control method is presented in this article for AC servo system. Combining fuzzy control and sliding mode control, the chattering of sliding mode control is solved. Introducing an integral element, the stable-state precision is enhanced. The sliding surface designed by means of this method is a time-varied one, which has powerful robustness to parameter variations and external disturbances. Simulation study results show that this method is correct and effective.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133136263","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.970662
Hu Yan, Tang Renyuan, Liang Zhenguang, Wan XiuLian, Zhong Juntao
The leakage magnetic fields due to heavy current leads of bushings belong to 3D open boundary fields in a large transformer. The distributions of the fields are calculated by 3D geometric transform method. The eddy current densities and loss in the ascending flange are analyzed at the different materials and thickness of copper screen.
{"title":"Computation of 3D open boundary leakage magnetic fields due to heavy current leads of bushings of large transformers","authors":"Hu Yan, Tang Renyuan, Liang Zhenguang, Wan XiuLian, Zhong Juntao","doi":"10.1109/ICEMS.2001.970662","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970662","url":null,"abstract":"The leakage magnetic fields due to heavy current leads of bushings belong to 3D open boundary fields in a large transformer. The distributions of the fields are calculated by 3D geometric transform method. The eddy current densities and loss in the ascending flange are analyzed at the different materials and thickness of copper screen.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"20 11-12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132845756","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.970739
Zhang Junhong, W. Hongfang
In this paper, a novel welding inverter power source system with constant current output characteristics is proposed, in order to get an independent control of spatter control, weld formation and arc length stability in CO/sub 2/ Gas Metal Arc Welding. In the system, the waveform fuzzy logic control method is built to guarantee the arc length stability. Some experiments are carried out with the designed system and the results are provided and discussed.
{"title":"A novel welding inverter power source system with constant current output characteristic based on fuzzy logic control","authors":"Zhang Junhong, W. Hongfang","doi":"10.1109/ICEMS.2001.970739","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970739","url":null,"abstract":"In this paper, a novel welding inverter power source system with constant current output characteristics is proposed, in order to get an independent control of spatter control, weld formation and arc length stability in CO/sub 2/ Gas Metal Arc Welding. In the system, the waveform fuzzy logic control method is built to guarantee the arc length stability. Some experiments are carried out with the designed system and the results are provided and discussed.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122342272","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.970760
Zhu Qing, Zhou Youqing, Hu Juan
Superconducting techniques will be used in electrical power systems widely. Installing a high temperature superconducting fault current limiter (HSCFCL) in electrical power systems is an effective measure to limit the fault short circuit current and to reduce breaking capacity of the circuit breaker. In this paper, the scope of critical current of a superconductor is defined. A rectifier type HSCFCL is selected. The fault current-limiting duration of HSCFCL is determined and its principle is sized up. At the end of this paper, the creative characteristics of this scheme are raised.
{"title":"The research of a rectifier type high temperature superconducting fault current limiter","authors":"Zhu Qing, Zhou Youqing, Hu Juan","doi":"10.1109/ICEMS.2001.970760","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970760","url":null,"abstract":"Superconducting techniques will be used in electrical power systems widely. Installing a high temperature superconducting fault current limiter (HSCFCL) in electrical power systems is an effective measure to limit the fault short circuit current and to reduce breaking capacity of the circuit breaker. In this paper, the scope of critical current of a superconductor is defined. A rectifier type HSCFCL is selected. The fault current-limiting duration of HSCFCL is determined and its principle is sized up. At the end of this paper, the creative characteristics of this scheme are raised.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122357789","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}
Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.970618
Lu Xianliang, Wu Hanguang
This paper presents the maximum efficiency controlling strategy for induction machine. The Theoretical and experimental study have been done to investigate the relationship between the highest efficiency and the rate of iron loss to copper loss in this paper. The significant equations have been derived and highest efficiency controlling algorithm will be introduced. The method to get control parameters from experiment is also discussed here.
{"title":"Maximum efficiency control strategy for induction machine","authors":"Lu Xianliang, Wu Hanguang","doi":"10.1109/ICEMS.2001.970618","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970618","url":null,"abstract":"This paper presents the maximum efficiency controlling strategy for induction machine. The Theoretical and experimental study have been done to investigate the relationship between the highest efficiency and the rate of iron loss to copper loss in this paper. The significant equations have been derived and highest efficiency controlling algorithm will be introduced. The method to get control parameters from experiment is also discussed here.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":"191 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121096095","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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