Synchronous reluctance machine with controlled capacitance injection
- Ogunjuyigbe, A. S. O., Jimoh, A. A., Nicolae, Dan-Valentin, Agee, J. T.
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin , Agee, J. T.
- Date: 2008
- Subjects: Capacitators , Switched capacitator circuits
- Language: English
- Type: Conference procedings
- Identifier: http://ujcontent.uj.ac.za8080/10210/382760 , http://hdl.handle.net/10210/18737 , uj:16038 , Citation: Ogunjuyigbe, A.S.O. et al. 2008. Synchronous reluctance machine with controlled capacitance injection. OPTIM'08, 22-24 May, Brasov, Romania. DOI: 10.1109/OPTIM.2008.4602384
- Description: Abstract This paper describes a detailed analysis, verified by practical experimental results, of a synchronous reluctance machine with two similar stator windings and capacitance injection using a static switch. The steady state equivalent circuit is developed and used to investigate leading capacitance injection into the machine via a balanced three phase auxiliary winding that is only magnetically coupled to the main winding. The scheme was found to improve the torque and power factor performance of the machine as well as reduce harmonics in the line current. Two switching topologies were utilized for the static control in this arrangement, and both were found to present good and comparable results. Experimental results corroborate the simulations.
- Full Text:
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin , Agee, J. T.
- Date: 2008
- Subjects: Capacitators , Switched capacitator circuits
- Language: English
- Type: Conference procedings
- Identifier: http://ujcontent.uj.ac.za8080/10210/382760 , http://hdl.handle.net/10210/18737 , uj:16038 , Citation: Ogunjuyigbe, A.S.O. et al. 2008. Synchronous reluctance machine with controlled capacitance injection. OPTIM'08, 22-24 May, Brasov, Romania. DOI: 10.1109/OPTIM.2008.4602384
- Description: Abstract This paper describes a detailed analysis, verified by practical experimental results, of a synchronous reluctance machine with two similar stator windings and capacitance injection using a static switch. The steady state equivalent circuit is developed and used to investigate leading capacitance injection into the machine via a balanced three phase auxiliary winding that is only magnetically coupled to the main winding. The scheme was found to improve the torque and power factor performance of the machine as well as reduce harmonics in the line current. Two switching topologies were utilized for the static control in this arrangement, and both were found to present good and comparable results. Experimental results corroborate the simulations.
- Full Text:
Analysis of synchronous reluctance machine with magnetically coupled three-phase windings and reactive power compensation
- Ogunjuyigbe, A. S. O., Jimoh, A. A., Nicolae, Dan-Valentin, Obe, E. S.
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin , Obe, E. S.
- Date: 2010
- Subjects: Synchronous machinery
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/18578 , uj:16017 , ISSN :17518660 , Citation: Ogunjuyigbe, A.S.O. et al. 2010. Analysis of syhnchronous reluctance machine with magnetically coupled three phase windings and reactive power compensation. IET Electric Power Applications, 4(4):291-303. , DOI:10.1049/iet-epa.2009.0134
- Description: Abstract: Synchronous reluctance machine with simple salient rotor is known to have poor power factor because of its poor reactance ratio. This study presents the use of an auxiliary winding attached to a balanced capacitor to improve the effective reactance ratio as well as the performance characteristics of synchronous reluctance machine. A unique feature of this configuration is that although the machine runs at synchronous speed, the effective reactance ratio of the machine can be improved by appropriate sizing of the capacitor attached to the auxiliary winding, with the constraint of the ampere turn rating of the auxiliary winding. The operational characteristics of a simple salient rotor synchronous reluctance machine equipped with this configuration were investigated and shown to have a desirable performance. How the effective reactance ratio, power factor and airgap flux distribution depend on the size of capacitor attached to the auxiliary winding is determined using a simplified mathematical model of the system. Analytical results and experimental measurements are in good agreement, and demonstrate the effectiveness and benefits of the configuration
- Full Text:
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin , Obe, E. S.
- Date: 2010
- Subjects: Synchronous machinery
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/18578 , uj:16017 , ISSN :17518660 , Citation: Ogunjuyigbe, A.S.O. et al. 2010. Analysis of syhnchronous reluctance machine with magnetically coupled three phase windings and reactive power compensation. IET Electric Power Applications, 4(4):291-303. , DOI:10.1049/iet-epa.2009.0134
- Description: Abstract: Synchronous reluctance machine with simple salient rotor is known to have poor power factor because of its poor reactance ratio. This study presents the use of an auxiliary winding attached to a balanced capacitor to improve the effective reactance ratio as well as the performance characteristics of synchronous reluctance machine. A unique feature of this configuration is that although the machine runs at synchronous speed, the effective reactance ratio of the machine can be improved by appropriate sizing of the capacitor attached to the auxiliary winding, with the constraint of the ampere turn rating of the auxiliary winding. The operational characteristics of a simple salient rotor synchronous reluctance machine equipped with this configuration were investigated and shown to have a desirable performance. How the effective reactance ratio, power factor and airgap flux distribution depend on the size of capacitor attached to the auxiliary winding is determined using a simplified mathematical model of the system. Analytical results and experimental measurements are in good agreement, and demonstrate the effectiveness and benefits of the configuration
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Performance evaluation of a three-phase induction machine with auxilliary winding fed by a leading reactive current
- Muteba, M. C., Jimoh, Adisa A., Nicolae, Dan-Valentin, Ogunjuyigbe, A. S. O.
- Authors: Muteba, M. C. , Jimoh, Adisa A. , Nicolae, Dan-Valentin , Ogunjuyigbe, A. S. O.
- Date: 2008
- Subjects: Electric machines , Induction machines
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/18639 , uj:16025 , Citation: Ogunjuyigbe, A.S.O., Jimoh, A.A. & Nicolae, D.V. 2008. Performance evaluation of a three-phase induction motor with auxiliary winding fed by a leading reactive current. The IASTED International Conrference on Power and Energy Systems, 8-10 September, Gaborone, Botswana.
- Description: Abstract In this paper the performance of three-phase induction machine equipped with a three-phase auxiliary winding which is only magnetically coupled to the stator main winding is evaluated. A capacitive load is connected in parallel to each phase of the auxiliary winding and serves to inject a leading reactive current into the machine. Steady state and dynamic performance of the machine are evaluated under various loading and compensative conditions. The experimental results show that it possible to obtain a comparatively good power factor with a fixed capacitive load for various loadings of the asynchronous machine.
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- Authors: Muteba, M. C. , Jimoh, Adisa A. , Nicolae, Dan-Valentin , Ogunjuyigbe, A. S. O.
- Date: 2008
- Subjects: Electric machines , Induction machines
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/18639 , uj:16025 , Citation: Ogunjuyigbe, A.S.O., Jimoh, A.A. & Nicolae, D.V. 2008. Performance evaluation of a three-phase induction motor with auxiliary winding fed by a leading reactive current. The IASTED International Conrference on Power and Energy Systems, 8-10 September, Gaborone, Botswana.
- Description: Abstract In this paper the performance of three-phase induction machine equipped with a three-phase auxiliary winding which is only magnetically coupled to the stator main winding is evaluated. A capacitive load is connected in parallel to each phase of the auxiliary winding and serves to inject a leading reactive current into the machine. Steady state and dynamic performance of the machine are evaluated under various loading and compensative conditions. The experimental results show that it possible to obtain a comparatively good power factor with a fixed capacitive load for various loadings of the asynchronous machine.
- Full Text:
Test results on synchronous reluctance machine with auxilliary winding for leading reactive power injection
- Ogunjuyigbe, A. S. O., Jimoh, A. A., Nicolae, Dan-Valentin
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2008
- Subjects: Synchronous machinery , Performance standards , Capacitance injection
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/16468 , uj:15776 , Citation: Ogunjuyigbe, A.S.O., Jimoh, A.A. & Nicolae, D.V. 2008. Test results on synchronous reluctance machine with auxilliary winding for leading reactive power injection. Proceedings of the second IASTED Africa Conference Power and Energy Systems (AfricaPES 2008)September 8-10, 2008, Gaborone, Botswana
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- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2008
- Subjects: Synchronous machinery , Performance standards , Capacitance injection
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/16468 , uj:15776 , Citation: Ogunjuyigbe, A.S.O., Jimoh, A.A. & Nicolae, D.V. 2008. Test results on synchronous reluctance machine with auxilliary winding for leading reactive power injection. Proceedings of the second IASTED Africa Conference Power and Energy Systems (AfricaPES 2008)September 8-10, 2008, Gaborone, Botswana
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Improving synchronous reluctance machine performance by direct capacitance injection through an auxiliary winding
- Ogunjuyigbe, A. S. O., Jimoh, A. A., Nicolae, Dan-Valentin
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2007
- Subjects: Synchronous generators , Capacitors , Power-factor meters
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/20415 , uj:16094 , Citation: Ogunjuyigbe, A.S.O., Jimoh, A.A. & Nicolae, D.V. 2007. Improving synchronous reluctance machine performance by direct capacitance injection through an auxiliary winding. ICEMS’07 International Conference on Electrical Machines and Systems 2007, October 8-11, Seoul Olympic Parktel, Seoul, Korea:1055-1060
- Description: Abstract: Synchronous reluctance machine with a conventional rotor structure and a 3-phase auxiliary winding attached to a balanced capacitance for power factor improvement will find application in high speed , high power drives. This paper presents an understanding of its operation using the electromagnetic as well as the electric circuit concepts. Analytical and simulation results of this machine configuration show that the torque as well as the power factor performance is better compared to conventional reluctance machine.
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- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin
- Date: 2007
- Subjects: Synchronous generators , Capacitors , Power-factor meters
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/20415 , uj:16094 , Citation: Ogunjuyigbe, A.S.O., Jimoh, A.A. & Nicolae, D.V. 2007. Improving synchronous reluctance machine performance by direct capacitance injection through an auxiliary winding. ICEMS’07 International Conference on Electrical Machines and Systems 2007, October 8-11, Seoul Olympic Parktel, Seoul, Korea:1055-1060
- Description: Abstract: Synchronous reluctance machine with a conventional rotor structure and a 3-phase auxiliary winding attached to a balanced capacitance for power factor improvement will find application in high speed , high power drives. This paper presents an understanding of its operation using the electromagnetic as well as the electric circuit concepts. Analytical and simulation results of this machine configuration show that the torque as well as the power factor performance is better compared to conventional reluctance machine.
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Synchronous reluctance machine with magnetically-coupled, double three-phase windings
- Ogunjuyigbe, A. S. O., Obe, E. S., Nicolae, Dan-Valentin, Jimoh, A. A.
- Authors: Ogunjuyigbe, A. S. O. , Obe, E. S. , Nicolae, Dan-Valentin , Jimoh, A. A.
- Date: 2009
- Subjects: Electromagnetism , Electric transformers
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/22421 , uj:16198 , Citation: Ogunjuyigbe, A.S.O, et al. 2009. Synchronous reluctance machine with magnetically-coupled, double three-phase windings. Proceedings of the Electromotion Joint Symposium, 1-3 September 2009, Lille, France.
- Description: Abstract: Please refer to full text to view abstract Please refer to full text to view abstract
- Full Text:
- Authors: Ogunjuyigbe, A. S. O. , Obe, E. S. , Nicolae, Dan-Valentin , Jimoh, A. A.
- Date: 2009
- Subjects: Electromagnetism , Electric transformers
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/22421 , uj:16198 , Citation: Ogunjuyigbe, A.S.O, et al. 2009. Synchronous reluctance machine with magnetically-coupled, double three-phase windings. Proceedings of the Electromotion Joint Symposium, 1-3 September 2009, Lille, France.
- Description: Abstract: Please refer to full text to view abstract Please refer to full text to view abstract
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Simulation of six phase induction machine using the Matlab/Simulink environment
- Ogunjuyigbe, A. S. O., Nnachi, A. F., Jimoh, Adisa A., Nicolae, Dan-Valentin
- Authors: Ogunjuyigbe, A. S. O. , Nnachi, A. F. , Jimoh, Adisa A. , Nicolae, Dan-Valentin
- Date: 2008
- Subjects: MATLAB , SIMULINK , Electric machinery , Converter simulations , Computer-aided engineering
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/18518 , uj:16010 , Citation: Ogunjuyigbe, A.S.O. et al. 2008. Simulation of six phase split winding induction machine using the MATLAB/SIMULINK environment. Journal for Electrical Enginnering, 8(3): 33-39
- Description: Abstract: Six-phase induction machine presents several benefits over their conventional three-phase counterpart. This paper thus presents the model and described in detail the simulation of a Six-phase split winding induction machine in a Matlab/Simulink environment. The Simulink model is built in such a flexible manner such that various variables of the machine can be accessed easily for further purposes such as control. Finally, simulation results showing free acceleration as well as dynamic response of the machine were presented for both direct ac supply and the PWM inverter voltage source.
- Full Text:
- Authors: Ogunjuyigbe, A. S. O. , Nnachi, A. F. , Jimoh, Adisa A. , Nicolae, Dan-Valentin
- Date: 2008
- Subjects: MATLAB , SIMULINK , Electric machinery , Converter simulations , Computer-aided engineering
- Language: English
- Type: Conference proceedings
- Identifier: http://hdl.handle.net/10210/18518 , uj:16010 , Citation: Ogunjuyigbe, A.S.O. et al. 2008. Simulation of six phase split winding induction machine using the MATLAB/SIMULINK environment. Journal for Electrical Enginnering, 8(3): 33-39
- Description: Abstract: Six-phase induction machine presents several benefits over their conventional three-phase counterpart. This paper thus presents the model and described in detail the simulation of a Six-phase split winding induction machine in a Matlab/Simulink environment. The Simulink model is built in such a flexible manner such that various variables of the machine can be accessed easily for further purposes such as control. Finally, simulation results showing free acceleration as well as dynamic response of the machine were presented for both direct ac supply and the PWM inverter voltage source.
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Performance analysis of capacitance compensated dual stator winding synchronous reluctance machine
- Ogunjuyigbe, A. S. O., Jimoh, A. A., Nicolae, Dan-Valentin, Obe, E. S.
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin , Obe, E. S.
- Date: 2010
- Subjects: Capacitance meters , Synchronous machinery , Torque
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/18633 , uj:16024 , ISSN:1827-6660 , Citation: Ogunjuyigbe, A.S.O. et al. 2010. Performance analysis of capacitance compensated dual stator winding synchronous reluctance machine. International Review of Electrical Engineering,5(2), April 2010:437-446
- Description: Abstract: Synchronous reluctance machine with simple salient rotor are known to have poor power factor because they have a low effective reactance ratio. This paper used a 3 phase auxiliary winding and balanced capacitance compensation to ifluence the effective reactance ratio of a synchronous reluctance machine with simple salient rotor structure, such that its power factor and torque/ampere performance is improved. A mathematical model and dq equivalent circuit suitable for dynamic and steady state analysis was developed and used to study the synchronous operation of this machine.Analytical as well as experimental results for a 4-pole, 36 slots simple salient rotor reluctance machine showed that the effective reactance ration increased with the capacitance size, and the machine operated at a maximum power factor of 0.969 without altering the geometry of the rotor. the torque per ampere of the machine also improved with the size of capacitor attached to the auxilary winding.
- Full Text: false
- Authors: Ogunjuyigbe, A. S. O. , Jimoh, A. A. , Nicolae, Dan-Valentin , Obe, E. S.
- Date: 2010
- Subjects: Capacitance meters , Synchronous machinery , Torque
- Language: English
- Type: Article
- Identifier: http://hdl.handle.net/10210/18633 , uj:16024 , ISSN:1827-6660 , Citation: Ogunjuyigbe, A.S.O. et al. 2010. Performance analysis of capacitance compensated dual stator winding synchronous reluctance machine. International Review of Electrical Engineering,5(2), April 2010:437-446
- Description: Abstract: Synchronous reluctance machine with simple salient rotor are known to have poor power factor because they have a low effective reactance ratio. This paper used a 3 phase auxiliary winding and balanced capacitance compensation to ifluence the effective reactance ratio of a synchronous reluctance machine with simple salient rotor structure, such that its power factor and torque/ampere performance is improved. A mathematical model and dq equivalent circuit suitable for dynamic and steady state analysis was developed and used to study the synchronous operation of this machine.Analytical as well as experimental results for a 4-pole, 36 slots simple salient rotor reluctance machine showed that the effective reactance ration increased with the capacitance size, and the machine operated at a maximum power factor of 0.969 without altering the geometry of the rotor. the torque per ampere of the machine also improved with the size of capacitor attached to the auxilary winding.
- Full Text: false
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