EPE Association: EPE 2013 - DS3e: Induction Machines and Switched Reluctance Machines

EPE 2013 - DS3e: Induction Machines and Switched Reluctance Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 10: Electrical machines > EPE 2013 - DS3e: Induction Machines and Switched Reluctance Machines

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   A detailed analysis of the propagation paths of high-frequency common mode currents in AC motors
By Nidhal BOUCENNA, Sami HLIOUI, Francois COSTA, Bertrand REVOL [View]
[Download]

Abstract: this paper describes the phenomena of propagation of common mode high-frequency currents (HF) in the metallic parts of AC machines supplied by pulse width modulation (PWM) inverters. A detailed analysis based on finite elements modeling is proposed to identify the privileged paths of these HF currents and parameters that rule this phenomenon.

   A Non-unity Torque Sharing Function for Torque Ripple Minimization of Switched Reluctance Generators
By Kiwoo PARK, Xiao LIU, Zhe CHEN [View]
[Download]

Abstract: This paper presents a new torque ripple minimization technique for a Switched Reluctance Generator(SRG). Although the SRG has many advantageous characteristics as a generator, it has not been widelyemployed in the industry. One of the most notorious disadvantages of the SRG is its high torque ripple.In this paper, a non-unity Torque Sharing Function (TSF) is proposed to minimize the torque rippleover a wide speed range of operation. Simulation results are presented to verify the effectiveness of theproposed torque ripple minimization technique.

   A novel DC Excited Reluctance Generator with segment type rotor core
By Kotaro SAITO, Hiroki GOTO, Osamu ICHINOKURA [View]
[Download]

Abstract: This paper presents a novel segment type DC excited Reluctance Generator (DCeRG) with segment type rotor core. Conventional proposed DCeRG has simple and robust structure, low cost, and maintenance free for small-scale distributed power sources. In the paper, by using FEM we confirmed that the output power and efficiency of the DCeRG with segment type rotor core are improved in comparison with conventional DCeRG which has salient pole rotor. Furthermore, torque ripple is remarkably reduced by the segment rotor structure.

   A Study of Rotor Pole Shape of In-Wheel Direct Drive SR Motor
By Takayasu OGASAWARA, Hiroki GOTO, Osamu ICHINOKURA [View]
[Download]

Abstract: A switched reluctance (SR) motor has an extremely simple and robust structure, and high heat capability because of no magnet. Therefore, these advantages are suitable for an application of the in-wheel direct drive SR motor to electric vehicles. Outer-rotor-type multipolar SR motors, however, have the invalid space where the inside of the stator core. The authors propose that a drive circuit is integrated into this space because of an effective use of interior space in the car. They developed the integrated type in-wheel SR motors and the electric vehicle which equipped with these SR motors underwent a driving trial. And yet it is necessary to accelerate more powerfully and expand the space to integrate the drive circuit. This paper presents an in-wheel SR motor improved torque density. The proposed SR motor, whose integrated space is broader and stator pole is longer than previously, has two features for improvement of torque density; the first one is asymmetrical rotor pole structure that torque is improved in only one rotational direction; the second one is the overlap of the excitation to increase effective voltage. In the proposed SR motor, the maximum torque volume ratio is about 38 N･m/L.

   Design and Optimization Tools for High-Efficiency Three-Phase Induction Motors
By Ruud SPRANGERS, Elena LOMONOVA, Konstantin BOYNOV, Jeroen WAARMA, Johan PAULIDES [View]
[Download]

Abstract: An Expert System (ES) for the analysis and design optimization of low-power, three-phase inductionmotors (IMs) is presented. The ES is based on analytical models, which are carefully selected fromliterature, and coupled together to calculate motor performance characteristics. These performance characteristicsare computed within a few seconds. Also, validation of the ES calculation results againstmeasurements on four test motors shows that the analysis results are reasonably accurate. Additionally,the ES is applied to redesign a case study motor and a prototype of the new design is realized. Thetheoretical design results are validated against measurement performed on the prototype. This validationshows that the design optimization works, though a more accurate description of the lamination materialB(H) characteristic is desirable to improve the accuracy of the ES.

   Double Stator Winding Induction Generator for Wind and Hydro Applications: 2D-FEM Analysis and Optimal Design
By Tutelea LUCIAN NICOLAE, Deaconu SORIN IOAN, Bidisan NICOLAE, Boldea ION [View]
[Download]

Abstract: In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paperreports on preliminary optimal design aspects and FEM analysis of a 3kW, 250 rpm, dual statorwinding asynchronous (DSWA) generator. At the first stage the single winding, three phaseasynchronous rotor is optimally designed for low speed and low frequency considering the influenceof the poles pairs on the main dimensions, weight, active material cost and efficiency. Than, the ratedpower and cost reduction of the inverter is analyzed considering dual stator winding asynchronousgenerators in two topologies: with the inverter placed on the excitation windings and with the inverterplaced on the main winding. The analytical model used for optimal design and the model of the doublestator winding is validated trough finite element method. Finally the proposed solutions are comparedwith the single winding induction generators.

   Electromagnetic design of irregular three phase windings
By Radoslav CIPIN, Miroslav PATOCKA [View]
[Download]

Abstract: The paper deals with the design of irregular AC windings by a new method. The new method is based on the notion of “local density of conductors”. Design of the interspersed winding 1-3-1 is shown as an example of using this new method. This type of winding can be used to reduce higher harmonic components of magnetic flux density in the air gap, mainly the fifth and the seventh harmonic.This new method can be used for any three-phase windings even for arbitrary irregular windings with different number of conductors in individual slots.

   High frequency parameters of a double-fed machineand additional energy losses from a frequency converter
By Grigorii GOGOLEV, Mikhail PRONIN, Alexei VORONTSOV, Andrey VATAYEV, Yirii KOSKIN, Vladislav TRETIAKOV, Vasiliy SHELYUKH [View]
[Download]

Abstract: A prototype of the hydroelectric pumped storage power plant with 2.4 MW asynchronized generatormotorand frequency converter has been produced. The computer models of the system have beendeveloped. The experimental study of high-frequency parameters of the generator-motor windingshave been carried out. The assessment method of the machine additional energy losses caused byconverter voltage distortions have been developed. The power loss comparison in the generator-motorcaused by two-level, three-level and cascaded frequency converters has been done.

   Influence of Temperature-dependent Materials on Mathematical Modelling of Thermal Problems of Induction Machines
By Vladimir KINDL, Karel HRUSKA, Roman PECHANEK [View]
[Download]

Abstract: The modern design of an induction traction machine includes a complex of coupled electromagnetic and thermal analyses for effective utilization of machine's space. This paper summarizes a comparison between less and more complicated ways of induction machine's modelling.

   Model of the Induction Machine including Saturation
By Jose ALLER, Daniel DELGADO, Alexander BUENO, Jose RESTREPO, Julio VIOLA [View]
[Download]

Abstract: This work proposes a model for induction machines in natural coordinates “abc”, developed consideringthe nonlinear characteristics of saturation. Traditionally, the models for the induction machine includingthis effect make use of linear transformations. However, the nonlinearity of saturation does not allowthe use of these transformations, giving invalid results. Flux linkage in each phase leads to the saturationcoefficient and this to the magnetic permeance. Hence, the saturation coefficient produces a newinductance in natural coordinates that considers the nonlinearity of saturation. The machine behavior iscomputed using a state variable model in natural coordinates described in the space vector frame. Theresults obtained by the proposed model give a better harmonic representation than the “dq0”models obtained by neglecting the magnetic hysteresis effect. A comparison between the proposed representation and the traditional one shows the advantages of the former.

   Performance improvement of Induction Motor by press molded SMC Core
By Masayuki MORIMOTO, Mamiko INAMORI [View]
[Download]

Abstract: In this paper, the performance improvement of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) is presented. By using SMC, 3D shaped core is easily constructed. The teeth of the stator core extended in order to enlarge the pole surface area in the same outer dimension of the motor. In this presentation, the motor performance of the motor using the core made by mold process will be presented. The mold process decreases iron loss which is caused by the heat at the machining of bulk SMC. This 3D shape increases output power, Therefore, the efficiency improves, and the maximum output power increases at the same external dimension of the motor.

   Quantitative Rotor Fault Diagnosis in Wound Rotor Induction Machine for Wind Energy Conversion Systems under Time-varying Conditions
By Yasser GRITLI, Luca ZARRI, Michele MENGONI, Claudio ROSSI, Domenico CASADEI, Fiorenzo FILIPPETTI [View]
[Download]

Abstract: The aim of this paper is to present a new diagnosis technique for the detection of rotor electrical faults in three-phase wound rotor induction machines (WRIMs). In this application the rotor windings are supplied by a static converter for the control of active and reactive power flows from the generator to the electrical grid. The proposed diagnosis technique is based on the combined use of wavelet analysis and a pre-processing of the analyzed rotor voltages under time-varying conditions. Thus, the time evolution of the fault components can be effectively analyzed. A diagnostic index, periodically calculated, is introduced to estimate the rotor fault degree over time. Experimental results show the validity of the proposed technique, leading to an effective diagnosis procedure for rotor electrical faults in WRIMs.

   Stator Structure for Reducing Noise in Switched Reluctance Motor
By Tahashi KOTEGAWA, Ichiro MIKI [View]
[Download]

Abstract: This paper describes the stator structure of switched reluctance motor (SRM) that can reduce the acoustic noise. The bias of the stress on the stator pole of SRM generates the large displacement of the stator and the sound pressure level that equals the acoustic noise of the motor. The noise depends on the maximum displacement of the stator. Therefore, the trapezoidal shape of the stator pole and the improved stator yoke structure are proposed to achieve the purpose of this study. According to simulation and experimental results, the stator structure designs including the stator pole shape proposed show the effect of reducing the noise.

   Transient Magnetic Analysis of Voltage Pulse excited Induction Machines with respect to Diagnosis and Fault Detection
By Matthias SAMONIG, Thomas WOLBANK [View]
[Download]

Abstract: A new fault detection method for induction machines (IM) is analyzed with respect to transient magnetic material behavior by means of finite element (FE) modeling. The detection method uses the machines inverter to excite the IM with transient voltage pulses and measures the corresponding phase current responses. To account for the material behavior transient BH curves are identified from measurements on a demagnetized magnetic circuit and included in the FE model to accurately simulate pulsed voltage excitations.

EPE 2013 - DS3e: Induction Machines and Switched Reluctance Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2013 ECCE Europe - Conference > EPE 2013 - Topic 10: Electrical machines > EPE 2013 - DS3e: Induction Machines and Switched Reluctance Machines
	[return to parent folder]

	A detailed analysis of the propagation paths of high-frequency common mode currents in AC motors By Nidhal BOUCENNA, Sami HLIOUI, Francois COSTA, Bertrand REVOL	[View] [Download]
Abstract: this paper describes the phenomena of propagation of common mode high-frequency currents (HF) in the metallic parts of AC machines supplied by pulse width modulation (PWM) inverters. A detailed analysis based on finite elements modeling is proposed to identify the privileged paths of these HF currents and parameters that rule this phenomenon.

	A Non-unity Torque Sharing Function for Torque Ripple Minimization of Switched Reluctance Generators By Kiwoo PARK, Xiao LIU, Zhe CHEN	[View] [Download]
Abstract: This paper presents a new torque ripple minimization technique for a Switched Reluctance Generator(SRG). Although the SRG has many advantageous characteristics as a generator, it has not been widelyemployed in the industry. One of the most notorious disadvantages of the SRG is its high torque ripple.In this paper, a non-unity Torque Sharing Function (TSF) is proposed to minimize the torque rippleover a wide speed range of operation. Simulation results are presented to verify the effectiveness of theproposed torque ripple minimization technique.

	A novel DC Excited Reluctance Generator with segment type rotor core By Kotaro SAITO, Hiroki GOTO, Osamu ICHINOKURA	[View] [Download]
Abstract: This paper presents a novel segment type DC excited Reluctance Generator (DCeRG) with segment type rotor core. Conventional proposed DCeRG has simple and robust structure, low cost, and maintenance free for small-scale distributed power sources. In the paper, by using FEM we confirmed that the output power and efficiency of the DCeRG with segment type rotor core are improved in comparison with conventional DCeRG which has salient pole rotor. Furthermore, torque ripple is remarkably reduced by the segment rotor structure.

	A Study of Rotor Pole Shape of In-Wheel Direct Drive SR Motor By Takayasu OGASAWARA, Hiroki GOTO, Osamu ICHINOKURA	[View] [Download]
Abstract: A switched reluctance (SR) motor has an extremely simple and robust structure, and high heat capability because of no magnet. Therefore, these advantages are suitable for an application of the in-wheel direct drive SR motor to electric vehicles. Outer-rotor-type multipolar SR motors, however, have the invalid space where the inside of the stator core. The authors propose that a drive circuit is integrated into this space because of an effective use of interior space in the car. They developed the integrated type in-wheel SR motors and the electric vehicle which equipped with these SR motors underwent a driving trial. And yet it is necessary to accelerate more powerfully and expand the space to integrate the drive circuit. This paper presents an in-wheel SR motor improved torque density. The proposed SR motor, whose integrated space is broader and stator pole is longer than previously, has two features for improvement of torque density; the first one is asymmetrical rotor pole structure that torque is improved in only one rotational direction; the second one is the overlap of the excitation to increase effective voltage. In the proposed SR motor, the maximum torque volume ratio is about 38 N･m/L.

	Design and Optimization Tools for High-Efficiency Three-Phase Induction Motors By Ruud SPRANGERS, Elena LOMONOVA, Konstantin BOYNOV, Jeroen WAARMA, Johan PAULIDES	[View] [Download]
Abstract: An Expert System (ES) for the analysis and design optimization of low-power, three-phase inductionmotors (IMs) is presented. The ES is based on analytical models, which are carefully selected fromliterature, and coupled together to calculate motor performance characteristics. These performance characteristicsare computed within a few seconds. Also, validation of the ES calculation results againstmeasurements on four test motors shows that the analysis results are reasonably accurate. Additionally,the ES is applied to redesign a case study motor and a prototype of the new design is realized. Thetheoretical design results are validated against measurement performed on the prototype. This validationshows that the design optimization works, though a more accurate description of the lamination materialB(H) characteristic is desirable to improve the accuracy of the ES.

	Double Stator Winding Induction Generator for Wind and Hydro Applications: 2D-FEM Analysis and Optimal Design By Tutelea LUCIAN NICOLAE, Deaconu SORIN IOAN, Bidisan NICOLAE, Boldea ION	[View] [Download]
Abstract: In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paperreports on preliminary optimal design aspects and FEM analysis of a 3kW, 250 rpm, dual statorwinding asynchronous (DSWA) generator. At the first stage the single winding, three phaseasynchronous rotor is optimally designed for low speed and low frequency considering the influenceof the poles pairs on the main dimensions, weight, active material cost and efficiency. Than, the ratedpower and cost reduction of the inverter is analyzed considering dual stator winding asynchronousgenerators in two topologies: with the inverter placed on the excitation windings and with the inverterplaced on the main winding. The analytical model used for optimal design and the model of the doublestator winding is validated trough finite element method. Finally the proposed solutions are comparedwith the single winding induction generators.

	Electromagnetic design of irregular three phase windings By Radoslav CIPIN, Miroslav PATOCKA	[View] [Download]
Abstract: The paper deals with the design of irregular AC windings by a new method. The new method is based on the notion of “local density of conductors”. Design of the interspersed winding 1-3-1 is shown as an example of using this new method. This type of winding can be used to reduce higher harmonic components of magnetic flux density in the air gap, mainly the fifth and the seventh harmonic.This new method can be used for any three-phase windings even for arbitrary irregular windings with different number of conductors in individual slots.

	High frequency parameters of a double-fed machineand additional energy losses from a frequency converter By Grigorii GOGOLEV, Mikhail PRONIN, Alexei VORONTSOV, Andrey VATAYEV, Yirii KOSKIN, Vladislav TRETIAKOV, Vasiliy SHELYUKH	[View] [Download]
Abstract: A prototype of the hydroelectric pumped storage power plant with 2.4 MW asynchronized generatormotorand frequency converter has been produced. The computer models of the system have beendeveloped. The experimental study of high-frequency parameters of the generator-motor windingshave been carried out. The assessment method of the machine additional energy losses caused byconverter voltage distortions have been developed. The power loss comparison in the generator-motorcaused by two-level, three-level and cascaded frequency converters has been done.

	Influence of Temperature-dependent Materials on Mathematical Modelling of Thermal Problems of Induction Machines By Vladimir KINDL, Karel HRUSKA, Roman PECHANEK	[View] [Download]
Abstract: The modern design of an induction traction machine includes a complex of coupled electromagnetic and thermal analyses for effective utilization of machine's space. This paper summarizes a comparison between less and more complicated ways of induction machine's modelling.

	Model of the Induction Machine including Saturation By Jose ALLER, Daniel DELGADO, Alexander BUENO, Jose RESTREPO, Julio VIOLA	[View] [Download]
Abstract: This work proposes a model for induction machines in natural coordinates “abc”, developed consideringthe nonlinear characteristics of saturation. Traditionally, the models for the induction machine includingthis effect make use of linear transformations. However, the nonlinearity of saturation does not allowthe use of these transformations, giving invalid results. Flux linkage in each phase leads to the saturationcoefficient and this to the magnetic permeance. Hence, the saturation coefficient produces a newinductance in natural coordinates that considers the nonlinearity of saturation. The machine behavior iscomputed using a state variable model in natural coordinates described in the space vector frame. Theresults obtained by the proposed model give a better harmonic representation than the “dq0”models obtained by neglecting the magnetic hysteresis effect. A comparison between the proposed representation and the traditional one shows the advantages of the former.

	Performance improvement of Induction Motor by press molded SMC Core By Masayuki MORIMOTO, Mamiko INAMORI	[View] [Download]
Abstract: In this paper, the performance improvement of an induction motor of which stator core is made of molded SMC (Soft Magnetic Composite) is presented. By using SMC, 3D shaped core is easily constructed. The teeth of the stator core extended in order to enlarge the pole surface area in the same outer dimension of the motor. In this presentation, the motor performance of the motor using the core made by mold process will be presented. The mold process decreases iron loss which is caused by the heat at the machining of bulk SMC. This 3D shape increases output power, Therefore, the efficiency improves, and the maximum output power increases at the same external dimension of the motor.

	Quantitative Rotor Fault Diagnosis in Wound Rotor Induction Machine for Wind Energy Conversion Systems under Time-varying Conditions By Yasser GRITLI, Luca ZARRI, Michele MENGONI, Claudio ROSSI, Domenico CASADEI, Fiorenzo FILIPPETTI	[View] [Download]
Abstract: The aim of this paper is to present a new diagnosis technique for the detection of rotor electrical faults in three-phase wound rotor induction machines (WRIMs). In this application the rotor windings are supplied by a static converter for the control of active and reactive power flows from the generator to the electrical grid. The proposed diagnosis technique is based on the combined use of wavelet analysis and a pre-processing of the analyzed rotor voltages under time-varying conditions. Thus, the time evolution of the fault components can be effectively analyzed. A diagnostic index, periodically calculated, is introduced to estimate the rotor fault degree over time. Experimental results show the validity of the proposed technique, leading to an effective diagnosis procedure for rotor electrical faults in WRIMs.

	Stator Structure for Reducing Noise in Switched Reluctance Motor By Tahashi KOTEGAWA, Ichiro MIKI	[View] [Download]
Abstract: This paper describes the stator structure of switched reluctance motor (SRM) that can reduce the acoustic noise. The bias of the stress on the stator pole of SRM generates the large displacement of the stator and the sound pressure level that equals the acoustic noise of the motor. The noise depends on the maximum displacement of the stator. Therefore, the trapezoidal shape of the stator pole and the improved stator yoke structure are proposed to achieve the purpose of this study. According to simulation and experimental results, the stator structure designs including the stator pole shape proposed show the effect of reducing the noise.

	Transient Magnetic Analysis of Voltage Pulse excited Induction Machines with respect to Diagnosis and Fault Detection By Matthias SAMONIG, Thomas WOLBANK	[View] [Download]
Abstract: A new fault detection method for induction machines (IM) is analyzed with respect to transient magnetic material behavior by means of finite element (FE) modeling. The detection method uses the machines inverter to excite the IM with transient voltage pulses and measures the corresponding phase current responses. To account for the material behavior transient BH curves are identified from measurements on a demagnetized magnetic circuit and included in the FE model to accurately simulate pulsed voltage excitations.