Pub Date : 2001-08-18DOI: 10.1109/ICEMS.2001.970616
Youn-Ok Choi, Kang-Yeon Lee, K. Seo, Gi-bum Kim, Byung-Ho Jung, G. Cho, H. Baek, Sam-Yong Jeong
Direct torque control (DTC) of an AC motor has the fast torque and flux dynamic responses even though it has very simple scheme to implement. However, DTC do not show good performance at low speed range with conventional open loop stator flux observer when stator resistance varied. Therefore, authors propose a new nonlinear stator flux observer in order to estimate the stator flux of induction motor at low speed and show its simulation results.
{"title":"Performance analysis of the DTC using a closed loop stator flux observer for induction motor in the low speed range","authors":"Youn-Ok Choi, Kang-Yeon Lee, K. Seo, Gi-bum Kim, Byung-Ho Jung, G. Cho, H. Baek, Sam-Yong Jeong","doi":"10.1109/ICEMS.2001.970616","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970616","url":null,"abstract":"Direct torque control (DTC) of an AC motor has the fast torque and flux dynamic responses even though it has very simple scheme to implement. However, DTC do not show good performance at low speed range with conventional open loop stator flux observer when stator resistance varied. Therefore, authors propose a new nonlinear stator flux observer in order to estimate the stator flux of induction motor at low speed and show its simulation results.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123249511","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.2001.971878
Wu Jun, Li Shengyi, Pan Mengchun
This paper presents a novel parameter identification method for induction motors, using a least square estimation algorithm. It is simplified in practical applications, due to certain models and filters. Finally, promising results are compared with normal tests.
{"title":"A novel parameter identification method for induction motors","authors":"Wu Jun, Li Shengyi, Pan Mengchun","doi":"10.1109/ICEMS.2001.971878","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971878","url":null,"abstract":"This paper presents a novel parameter identification method for induction motors, using a least square estimation algorithm. It is simplified in practical applications, due to certain models and filters. Finally, promising results are compared with normal tests.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123151203","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.2001.970751
Zhuo-Fang, Wang-Yue, Li-Hui, Wang-Zhao'an
An active power filter for three-phase four-wire power systems is introduced in this paper. The compensation principle and structure of its main control circuits are given. The basic operation principle of the active power filter is analyzed, which is different from that of active power filters used in three-phase three-wire systems. Experimental results prove the effectiveness of the proposed control method and indicate that the active power filter has good compensation characteristics.
{"title":"Active power filter used for three-phase four-wire system","authors":"Zhuo-Fang, Wang-Yue, Li-Hui, Wang-Zhao'an","doi":"10.1109/ICEMS.2001.970751","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970751","url":null,"abstract":"An active power filter for three-phase four-wire power systems is introduced in this paper. The compensation principle and structure of its main control circuits are given. The basic operation principle of the active power filter is analyzed, which is different from that of active power filters used in three-phase three-wire systems. Experimental results prove the effectiveness of the proposed control method and indicate that the active power filter has good compensation characteristics.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121905037","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.2001.971774
N. Cheung, Yuan-rui Chen, Jie Wu
A robust H∞ controller for permanent magnet linear motor (PMLM) in transportation systems is designed in this paper. First, the state space equations of the motor are established. Then the H∞ control theory is applied to design a robust controller which allows mass variation of the moving part ranging from 0 to 100 percent of nominal load. The simulation and experimental results show that the system can achieve robust performance under either no load or nominal load.
{"title":"H∞ control of permanent magnet linear motor in transportation systems","authors":"N. Cheung, Yuan-rui Chen, Jie Wu","doi":"10.1109/ICEMS.2001.971774","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971774","url":null,"abstract":"A robust H∞ controller for permanent magnet linear motor (PMLM) in transportation systems is designed in this paper. First, the state space equations of the motor are established. Then the H∞ control theory is applied to design a robust controller which allows mass variation of the moving part ranging from 0 to 100 percent of nominal load. The simulation and experimental results show that the system can achieve robust performance under either no load or nominal load.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122577657","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.2001.971876
Chen Jian, Yuan Zhenmin
A neural network using the backpropagation algorithm is developed in this paper to identify the error patterns of the method of linear interpolation. The relationship between the input samples and the output error patterns is then established, which can be used to improve the accuracy of stepping motor design significantly.
{"title":"Application of artificial neural network in optimal design of step motor","authors":"Chen Jian, Yuan Zhenmin","doi":"10.1109/ICEMS.2001.971876","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971876","url":null,"abstract":"A neural network using the backpropagation algorithm is developed in this paper to identify the error patterns of the method of linear interpolation. The relationship between the input samples and the output error patterns is then established, which can be used to improve the accuracy of stepping motor design significantly.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126159895","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.2001.970671
Qi Yuting, Yang Xuechang
A transfer function method is being developed for both the impulse test and monitoring of power transformers. A three-phase equivalent circuit of power transformer based on the Bergeron method is created in this paper. The influences of input signals with different frequency characteristics on transfer function calculation are analyzed and a suitable input is selected to perform the evaluation of transformers' insulation conditions by transfer function method. Three different types of transformer faults are simulated in this paper. The results show the potential contributions to insulation fault monitoring and location.
{"title":"Insulation fault monitoring of power transformer by transfer function method","authors":"Qi Yuting, Yang Xuechang","doi":"10.1109/ICEMS.2001.970671","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970671","url":null,"abstract":"A transfer function method is being developed for both the impulse test and monitoring of power transformers. A three-phase equivalent circuit of power transformer based on the Bergeron method is created in this paper. The influences of input signals with different frequency characteristics on transfer function calculation are analyzed and a suitable input is selected to perform the evaluation of transformers' insulation conditions by transfer function method. Three different types of transformer faults are simulated in this paper. The results show the potential contributions to insulation fault monitoring and location.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126235665","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.2001.970684
Wu Xusheng, M. Weiming, Sun Jun-zhong, Yang Qing, Zhang Lei
Many self-contained electrical systems require simultaneous AC and DC power supply. The hybrid AC-DC supply generator (HADSG) is a good solution. Several independent Y-connected windings are equipped on the stator of HADSG, one delivers AC power and the others, termed DC windings, are connected to the bridge rectifier. Methods of parameter measurement considering DC winding resistances are presented for a typical HADSG with a 12-phase DC winding in this paper. The d-axis self and mutual reactances can be acquired by various short-circuit tests for one or two three-phase windings. Relevant formulas are derived for calculating the d-axis parameters through measuring the short-circuit currents and voltages of all open three-phase windings. According to the voltages and currents measured in slip-tests for AC and DC windings, the q-axis self and mutual reactances can be obtained. Using these reactances in the simulation program, the simulation and test results agree quite well.
{"title":"Parameter measurement of multi-phase synchronous machines with AC and DC output","authors":"Wu Xusheng, M. Weiming, Sun Jun-zhong, Yang Qing, Zhang Lei","doi":"10.1109/ICEMS.2001.970684","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970684","url":null,"abstract":"Many self-contained electrical systems require simultaneous AC and DC power supply. The hybrid AC-DC supply generator (HADSG) is a good solution. Several independent Y-connected windings are equipped on the stator of HADSG, one delivers AC power and the others, termed DC windings, are connected to the bridge rectifier. Methods of parameter measurement considering DC winding resistances are presented for a typical HADSG with a 12-phase DC winding in this paper. The d-axis self and mutual reactances can be acquired by various short-circuit tests for one or two three-phase windings. Relevant formulas are derived for calculating the d-axis parameters through measuring the short-circuit currents and voltages of all open three-phase windings. According to the voltages and currents measured in slip-tests for AC and DC windings, the q-axis self and mutual reactances can be obtained. Using these reactances in the simulation program, the simulation and test results agree quite well.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125646957","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.2001.971860
Wang Fengxiang, Zheng Qi-shi, Wang Baoguo
This paper introduces the operation principle of bearingless motors. The electromagnetic torque and magnetic levitation force of a bearingless motor with four rotor structures have been calculated and analyzed by means of finite element analysis. A new type of rotor structure is proposed based on the comparative study on torque and levitation force for different rotor structures.
{"title":"Torque and levitation force comparison of bearingless motor with different rotor structures","authors":"Wang Fengxiang, Zheng Qi-shi, Wang Baoguo","doi":"10.1109/ICEMS.2001.971860","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.971860","url":null,"abstract":"This paper introduces the operation principle of bearingless motors. The electromagnetic torque and magnetic levitation force of a bearingless motor with four rotor structures have been calculated and analyzed by means of finite element analysis. A new type of rotor structure is proposed based on the comparative study on torque and levitation force for different rotor structures.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129821885","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.2001.970677
Du Lin, Sun Caixin, Liao Ruijin, Li Jian, Z. Quan
Partial discharge (PD) testing is an effective means to find the internal insulation faults of generators and the acquired signal is the basis for further signal processing and insulation diagnosis. This paper presents the basic scheme of generator PD on-line detection and processing principle of data acquisition flow. A computer based system for digital acquisition, storage of the PD signal is described, the FFT analysis, FIR filter and other processing methods are illustrated. The methods of assessment for the digital measurement system are also illustrated.
{"title":"Digital measurement system for generator on-line PD monitoring system","authors":"Du Lin, Sun Caixin, Liao Ruijin, Li Jian, Z. Quan","doi":"10.1109/ICEMS.2001.970677","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970677","url":null,"abstract":"Partial discharge (PD) testing is an effective means to find the internal insulation faults of generators and the acquired signal is the basis for further signal processing and insulation diagnosis. This paper presents the basic scheme of generator PD on-line detection and processing principle of data acquisition flow. A computer based system for digital acquisition, storage of the PD signal is described, the FFT analysis, FIR filter and other processing methods are illustrated. The methods of assessment for the digital measurement system are also illustrated.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129946224","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.2001.970599
C. Chan
The future is "Intellectric", that is intelligent electricity-electric energy that is secure, clean and efficient. This is the major challenge of electric engineering in different fields. The role of engineers is to integrate science, technology and the business world and hence to make things happen. Engineering is about finding ways to modify the universe and life in order to extend our biological reach, the quality of our lives, and the niches in which we can survive. Technology is the means of improving human life by the application of all knowledge and experience. Innovation is the successful introduction of something new. It is not enough to pursue the whys of nature or to find how we can modify nature. We must also decide what we should do. If engineering is to have a strong say about the future, it needs to become integrated with science, society and humanistic concerns. 21/sup st/ century engineers will need to be astute makers, trusted innovators, agents of change, master integrators, enterprise enablers, technology stewards and knowledge handlers. Engineering should venture to develop new capabilities and a broader sense of mission. We should integrate what we know, what we can do and what we should do. We should also be able to integrate the biological organism, society and machines. We should strive to engineer a better tomorrow guided by a desire to give future generations a greener, healthier and more harmonious world.
{"title":"The challenges of electrical engineers in the 21/sup st/ century","authors":"C. Chan","doi":"10.1109/ICEMS.2001.970599","DOIUrl":"https://doi.org/10.1109/ICEMS.2001.970599","url":null,"abstract":"The future is \"Intellectric\", that is intelligent electricity-electric energy that is secure, clean and efficient. This is the major challenge of electric engineering in different fields. The role of engineers is to integrate science, technology and the business world and hence to make things happen. Engineering is about finding ways to modify the universe and life in order to extend our biological reach, the quality of our lives, and the niches in which we can survive. Technology is the means of improving human life by the application of all knowledge and experience. Innovation is the successful introduction of something new. It is not enough to pursue the whys of nature or to find how we can modify nature. We must also decide what we should do. If engineering is to have a strong say about the future, it needs to become integrated with science, society and humanistic concerns. 21/sup st/ century engineers will need to be astute makers, trusted innovators, agents of change, master integrators, enterprise enablers, technology stewards and knowledge handlers. Engineering should venture to develop new capabilities and a broader sense of mission. We should integrate what we know, what we can do and what we should do. We should also be able to integrate the biological organism, society and machines. We should strive to engineer a better tomorrow guided by a desire to give future generations a greener, healthier and more harmonious world.","PeriodicalId":143007,"journal":{"name":"ICEMS'2001. Proceedings of the Fifth International Conference on Electrical Machines and Systems (IEEE Cat. No.01EX501)","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2001-08-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131360243","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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