Pub Date : 2005-09-01DOI: 10.1109/DEMPED.2005.4662519
T. Sobczyk, M. Zajac, W. Juszczyk, Z. Kich, M. Sułowicz
The rapid growth of the signal processing theory resulted in the rise of new methods in diagnostics of the drives. This paper focuses on the application of the complete systems of orthogonal functions, for which fast computational procedures are applicable. It is shown that a spectral analysis employing bases of the Haar functions is highly suitable for both analysis and synthesis of the diagnostic signals in an on-line diagnostics of induction motor rotor faults. The resulting computational structures providing modularity of the fast transform algorithms may be set up of simple digital filter structures. Such an approach enables the synthesis of effective data processing algorithms, specifically when the goal is the speed of computation. These algorithms may be implemented in general purpose multiprocessor systems as well as in multiprocessor systems employing dedicated RISC CPUs.
{"title":"Signal processing for extraction of characteristic features of induction motor stator currents at rotor faults","authors":"T. Sobczyk, M. Zajac, W. Juszczyk, Z. Kich, M. Sułowicz","doi":"10.1109/DEMPED.2005.4662519","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662519","url":null,"abstract":"The rapid growth of the signal processing theory resulted in the rise of new methods in diagnostics of the drives. This paper focuses on the application of the complete systems of orthogonal functions, for which fast computational procedures are applicable. It is shown that a spectral analysis employing bases of the Haar functions is highly suitable for both analysis and synthesis of the diagnostic signals in an on-line diagnostics of induction motor rotor faults. The resulting computational structures providing modularity of the fast transform algorithms may be set up of simple digital filter structures. Such an approach enables the synthesis of effective data processing algorithms, specifically when the goal is the speed of computation. These algorithms may be implemented in general purpose multiprocessor systems as well as in multiprocessor systems employing dedicated RISC CPUs.","PeriodicalId":230148,"journal":{"name":"2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127696671","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 : 2005-09-01DOI: 10.1109/DEMPED.2005.4662540
R. Jayabalan, B. Fahimi
Advancements in high-power semiconductor technology have opened new avenues for application of power electronics converters. However, system level fault detection issues are yet to be addressed. A representative (hybrid vehicle automotive power system) multistage DC/DC converter consisting of two cascaded buck-converters is used for fault detection. Faults are introduced on the converters. Type of fault is detected from the measurement of available terminal voltages/currents in load and source converters. Analytical formulations developed are compared with simulated results for identifying fault signatures under different fault scenarios.
{"title":"Monitoring and fault diagnosis of DC-DC multistage converter for hybrid electric vehicles","authors":"R. Jayabalan, B. Fahimi","doi":"10.1109/DEMPED.2005.4662540","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662540","url":null,"abstract":"Advancements in high-power semiconductor technology have opened new avenues for application of power electronics converters. However, system level fault detection issues are yet to be addressed. A representative (hybrid vehicle automotive power system) multistage DC/DC converter consisting of two cascaded buck-converters is used for fault detection. Faults are introduced on the converters. Type of fault is detected from the measurement of available terminal voltages/currents in load and source converters. Analytical formulations developed are compared with simulated results for identifying fault signatures under different fault scenarios.","PeriodicalId":230148,"journal":{"name":"2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129010631","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 : 2005-09-01DOI: 10.1109/DEMPED.2005.4662499
E. Jouseau, G. Vivien, E. Odic, C. Maroni
Electrical failure prevention is a major issue for industry. In the field of medium voltage equipment, the determination of the state of health of this type of equipment and the evaluation of the time to failure, are very important. Partial discharge detection can be efficient to reach this objective. The acoustic and more precisely the ultrasonic method is a promising method for online, non-destructive and non-intrusive analysis. Thanks to this method, it is easier to reject the external noise on site; above all, measurements can be performed on in-service equipment. This paper presents the results of two experiments carried out on a dry Medium Voltage transformer enduring highly accelerated life testing. The studied partial discharges are surface partial discharges. The relationship between the acoustic energy emitted by these partial discharges and the ageing is investigated. It is shown that an ageing criterion can be derived from the observation of the evolution of an external acoustic signal.
{"title":"Exhibition of an ageing criterion based on partial detection for Medium Voltage equipment","authors":"E. Jouseau, G. Vivien, E. Odic, C. Maroni","doi":"10.1109/DEMPED.2005.4662499","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662499","url":null,"abstract":"Electrical failure prevention is a major issue for industry. In the field of medium voltage equipment, the determination of the state of health of this type of equipment and the evaluation of the time to failure, are very important. Partial discharge detection can be efficient to reach this objective. The acoustic and more precisely the ultrasonic method is a promising method for online, non-destructive and non-intrusive analysis. Thanks to this method, it is easier to reject the external noise on site; above all, measurements can be performed on in-service equipment. This paper presents the results of two experiments carried out on a dry Medium Voltage transformer enduring highly accelerated life testing. The studied partial discharges are surface partial discharges. The relationship between the acoustic energy emitted by these partial discharges and the ageing is investigated. It is shown that an ageing criterion can be derived from the observation of the evolution of an external acoustic signal.","PeriodicalId":230148,"journal":{"name":"2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129905040","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 : 2005-09-01DOI: 10.1109/DEMPED.2005.4662541
O. Chadebec, V. P. Bui, P. Granjon, L. Rouve, N. Le Bihan, J. Coulomb
This paper shows the reliability of fault detection on electrical machines by analysis of the low frequency magnetic stray field. It is based on our own experience about magnetic discretion of naval electrical propulsion machine. We try to apply the techniques developed in previous works on the subject to faults detection. In this paper we focus on rotor defaults in a synchronous generator (eccentricity and short-circuit in rotor). Two kinds of study are performed. The first one is numerical. Firstly, an adapted finite elements method is used to compute the stray field around the device. However, this approach is difficult to apply to fault detection and not well-adapted. A new model, simpler and faster, is developed. Results are compared for both modelling. The second one is experimental and is driven thanks to a laboratory machine representative of a real high power generator and to fluxgate magnetometers located around the device. Both studies show good agreement and demonstrate the reliability of the approach.
{"title":"Rotor fault detection of electrical machines by low frequency magnetic stray field analysis","authors":"O. Chadebec, V. P. Bui, P. Granjon, L. Rouve, N. Le Bihan, J. Coulomb","doi":"10.1109/DEMPED.2005.4662541","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662541","url":null,"abstract":"This paper shows the reliability of fault detection on electrical machines by analysis of the low frequency magnetic stray field. It is based on our own experience about magnetic discretion of naval electrical propulsion machine. We try to apply the techniques developed in previous works on the subject to faults detection. In this paper we focus on rotor defaults in a synchronous generator (eccentricity and short-circuit in rotor). Two kinds of study are performed. The first one is numerical. Firstly, an adapted finite elements method is used to compute the stray field around the device. However, this approach is difficult to apply to fault detection and not well-adapted. A new model, simpler and faster, is developed. Results are compared for both modelling. The second one is experimental and is driven thanks to a laboratory machine representative of a real high power generator and to fluxgate magnetometers located around the device. Both studies show good agreement and demonstrate the reliability of the approach.","PeriodicalId":230148,"journal":{"name":"2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124536508","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 : 2005-09-01DOI: 10.1109/DEMPED.2005.4662504
L. Swędrowski, J. Rusek
Damage of bearings is the most common cause of failures of squirrel-cage induction motors. A faulty bearing results in additional motor vibrations. They are reflected in the harmonic content of stator currents. In certain operating conditions the current signal is the sole source of information on the state of the motor. The paper presents a mathematical model of the motor, allowing for rotor eccentricities. Calculated spectra of the stator currents are presented for the cases of operation with rotor vibrations mapping with some approximation the vibrations caused by faulty bearings. The paper presents also results of laboratory simulations for a motor put into vibrations of adjustable frequency. Vibrations of the motor housing simulate the rotor oscillations caused by a damaged bearing. The results of laboratory simulations permitted to define the relations linking vibrations of the air gap with the components in the stator current spectrum.
{"title":"Model and simulation tests of a squirrel - cage induction motor with oscillation of the air gap","authors":"L. Swędrowski, J. Rusek","doi":"10.1109/DEMPED.2005.4662504","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662504","url":null,"abstract":"Damage of bearings is the most common cause of failures of squirrel-cage induction motors. A faulty bearing results in additional motor vibrations. They are reflected in the harmonic content of stator currents. In certain operating conditions the current signal is the sole source of information on the state of the motor. The paper presents a mathematical model of the motor, allowing for rotor eccentricities. Calculated spectra of the stator currents are presented for the cases of operation with rotor vibrations mapping with some approximation the vibrations caused by faulty bearings. The paper presents also results of laboratory simulations for a motor put into vibrations of adjustable frequency. Vibrations of the motor housing simulate the rotor oscillations caused by a damaged bearing. The results of laboratory simulations permitted to define the relations linking vibrations of the air gap with the components in the stator current spectrum.","PeriodicalId":230148,"journal":{"name":"2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125696324","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 : 2005-09-01DOI: 10.1109/DEMPED.2005.4662517
T. K. Ko, P. K. Choy, Peng Liu
Machinery condition monitoring by vibration analysis has been discussed over decades. Varieties of rotor, bearing and gearbox diagnostic techniques are available. Most of them are developed for rotary machines. Traditional spectrum analysis can successfully detect defects induced from a periodical impact signal under constant speed operation. However, a linear motion system does not exhibit a periodic behavior and the diagnosis technique is relatively new for researchers. This paper introduces a synchronous averaging and wavelet de-noising combined technique to detect defects on a precision linear motion servo-control system. Experimental results of the proposed method are also presented.
{"title":"Detection of mechanical fault in linear servo motion systems using synchronous-averaging and wavelet de-noising","authors":"T. K. Ko, P. K. Choy, Peng Liu","doi":"10.1109/DEMPED.2005.4662517","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662517","url":null,"abstract":"Machinery condition monitoring by vibration analysis has been discussed over decades. Varieties of rotor, bearing and gearbox diagnostic techniques are available. Most of them are developed for rotary machines. Traditional spectrum analysis can successfully detect defects induced from a periodical impact signal under constant speed operation. However, a linear motion system does not exhibit a periodic behavior and the diagnosis technique is relatively new for researchers. This paper introduces a synchronous averaging and wavelet de-noising combined technique to detect defects on a precision linear motion servo-control system. Experimental results of the proposed method are also presented.","PeriodicalId":230148,"journal":{"name":"2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128597312","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 : 1900-01-01DOI: 10.1109/DEMPED.2005.4662502
U. Werner, A. Binder
In asynchronous motors exist several kinds of excitations that can cause vibrations. In addition to the mechanical excitations, such as unbalance, there are also electromagnetic forces, which can cause vibrations. This report focuses on the influence of a dynamic rotor eccentricity on the vibrations in an asynchronous motor. After the coherences between rotor eccentricity and magnetic pull are shown, a theoretical rotor model is presented, which consists on the superposition of three different kinds of excitations - magnetic eccentricity, eccentricity of the rotor mass and a bent shaft - which cause a dynamic rotor eccentricity. An analysis of the theoretical rotor model and a finite element rotor dynamic calculation is presented, showing the calculation of the shaft vibration, caused by a rotor core eccentricity. Thus a comparison with the real measured shaft vibration is possible. The calculation is based on the separation of the calculated shaft vibrations into several components of excitation. With this separation the influence of each excitation on the shaft vibration can be evaluated, and the rotor design can be optimised for the operating speed range. This calculation method is useful to support the analysis of the measurement.
{"title":"Dynamic analysis due to eccentricity in asynchronous machines","authors":"U. Werner, A. Binder","doi":"10.1109/DEMPED.2005.4662502","DOIUrl":"https://doi.org/10.1109/DEMPED.2005.4662502","url":null,"abstract":"In asynchronous motors exist several kinds of excitations that can cause vibrations. In addition to the mechanical excitations, such as unbalance, there are also electromagnetic forces, which can cause vibrations. This report focuses on the influence of a dynamic rotor eccentricity on the vibrations in an asynchronous motor. After the coherences between rotor eccentricity and magnetic pull are shown, a theoretical rotor model is presented, which consists on the superposition of three different kinds of excitations - magnetic eccentricity, eccentricity of the rotor mass and a bent shaft - which cause a dynamic rotor eccentricity. An analysis of the theoretical rotor model and a finite element rotor dynamic calculation is presented, showing the calculation of the shaft vibration, caused by a rotor core eccentricity. Thus a comparison with the real measured shaft vibration is possible. The calculation is based on the separation of the calculated shaft vibrations into several components of excitation. With this separation the influence of each excitation on the shaft vibration can be evaluated, and the rotor design can be optimised for the operating speed range. This calculation method is useful to support the analysis of the measurement.","PeriodicalId":230148,"journal":{"name":"2005 5th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126809213","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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