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The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Mon, 17 Jun 2024 17:37:27 GMT2024-06-17T17:37:27ZReduced-Order Model of Rotor Cage in Multiphase Induction Machines: Application on the Prediction of Torque Pulsations
http://hdl.handle.net/10985/19597
Reduced-Order Model of Rotor Cage in Multiphase Induction Machines: Application on the Prediction of Torque Pulsations
MEKAHLIA, Abdelhak; SEMAIL, Eric; ZAHR, Hussein; SCUILLER, Franck
For three-phase induction machines supplied by sinusoidal current, it is usual to model the n-bar squirrel-cage by an equivalent two-phase circuit. For a multiphase induction machine which can be supplied with different harmonics of current, the reduced-order model of the rotor must be more carefully chosen in order to predict the pulsations of torque. The proposed analysis allows to avoid a wrong design with non-sinusoidal magnetomotive forces. An analytical approach is proposed and confirmed by Finite-Element modelling at first for a three-phase induction machine and secondly for a five-phase induction machine.
Wed, 01 Jan 2020 00:00:00 GMThttp://hdl.handle.net/10985/195972020-01-01T00:00:00ZMEKAHLIA, AbdelhakSEMAIL, EricZAHR, HusseinSCUILLER, FranckFor three-phase induction machines supplied by sinusoidal current, it is usual to model the n-bar squirrel-cage by an equivalent two-phase circuit. For a multiphase induction machine which can be supplied with different harmonics of current, the reduced-order model of the rotor must be more carefully chosen in order to predict the pulsations of torque. The proposed analysis allows to avoid a wrong design with non-sinusoidal magnetomotive forces. An analytical approach is proposed and confirmed by Finite-Element modelling at first for a three-phase induction machine and secondly for a five-phase induction machine.Design and Performance Analysis of Double Stator Axial Flux PM Generator for Rim Driven Marine Current Turbines
http://hdl.handle.net/10985/9617
Design and Performance Analysis of Double Stator Axial Flux PM Generator for Rim Driven Marine Current Turbines
DJEBARRI, Sofiane; CHARPENTIER, Jean-Frederic; BENBOUZID, Mohamed; SCUILLER, Franck
This paper deals with the design and performance analysis of double stator axial flux permanent magnet generators for rim-driven marine current turbines (MCT). Indeed for submarine applications, drive train reliability is a key feature to reduce maintenance requirements. Rim-driven direct-drive multi-stator generators can therefore be a very interesting solution to improve this reliability. In this context, the presented work focus on the design of a double-stator axial flux permanent magnets (PM) generator as a rim-driven direct-drive multi-stator generator. The paper details the models, specifications and an optimization procedure that allow to preliminary design these kind of generators for rim-driven marine turbines. Thereafter, validations with finite elements computations and performance analysis considering particular design of rim driven generators are presented. The obtained results highlight some designs issues of PM generators for rim driven marine turbines. In order to assess the effectiveness of the double stator axial flux PM generator, a comparison with a designed surface mounted radial flux PM generator for rim marine turbines is carried out.. The comparison highlights that the double stator axial flux generator presents a better cooling and a reduced active parts cost and mass than the radial flux PM generator.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10985/96172015-01-01T00:00:00ZDJEBARRI, SofianeCHARPENTIER, Jean-FredericBENBOUZID, MohamedSCUILLER, FranckThis paper deals with the design and performance analysis of double stator axial flux permanent magnet generators for rim-driven marine current turbines (MCT). Indeed for submarine applications, drive train reliability is a key feature to reduce maintenance requirements. Rim-driven direct-drive multi-stator generators can therefore be a very interesting solution to improve this reliability. In this context, the presented work focus on the design of a double-stator axial flux permanent magnets (PM) generator as a rim-driven direct-drive multi-stator generator. The paper details the models, specifications and an optimization procedure that allow to preliminary design these kind of generators for rim-driven marine turbines. Thereafter, validations with finite elements computations and performance analysis considering particular design of rim driven generators are presented. The obtained results highlight some designs issues of PM generators for rim driven marine turbines. In order to assess the effectiveness of the double stator axial flux PM generator, a comparison with a designed surface mounted radial flux PM generator for rim marine turbines is carried out.. The comparison highlights that the double stator axial flux generator presents a better cooling and a reduced active parts cost and mass than the radial flux PM generator.Design Considerations of Five-Phase Machine with Double p/3p Polarity
http://hdl.handle.net/10985/13423
Design Considerations of Five-Phase Machine with Double p/3p Polarity
GONG, Jinlin; ZAHR, Hussein; TRABELSI, Mohamed; ASLAN, Bassel; SEMAIL, Eric; SCUILLER, Franck
In the context of traction drives with required torque transient capabilities and a classically wide flux weakening speed range, this paper gives design considerations of a particular Double-Polarity (DP) five-phase machine. Beyond its intrinsic fault tolerance due its five phases, its specificity is the ability to develop torques of comparable values under three kinds of supply: with only first, third or both first and third sinusoidal currents. This property, due to first (E1) and third (E3) harmonic electromotive forces (emf) of comparable values, gives more degrees of freedom for the control of the machine. Unlike three-phase sinusoidal machine, flux weakening is no more the unique solution when maximum voltage is reached. Thanks to the extra degrees of freedom in this kind of machines, more possibilities for the control of the torque and current supply can be applied. At first, elements for the choice of slots/poles combination of such DP machines are given. Then, in case of an Interior Permanent Magnet Synchronous Machine (IPMSM), possible adaptations of the rotor are proposed in order to bring the double p/3p polarity property. The last design criterion considered is the level of eddy-current losses, important at high frequencies. For proof of the concept effectiveness, a prototype with a five-phase fractional-slot concentrated winding of 40 slots and 16/48 poles is presented with results from experimental set-up and Finite Element modeling. A comparison with equivalent no-fault-tolerant three-phase 24 slots /16 poles machines is also carried out.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10985/134232018-01-01T00:00:00ZGONG, JinlinZAHR, HusseinTRABELSI, MohamedASLAN, BasselSEMAIL, EricSCUILLER, FranckIn the context of traction drives with required torque transient capabilities and a classically wide flux weakening speed range, this paper gives design considerations of a particular Double-Polarity (DP) five-phase machine. Beyond its intrinsic fault tolerance due its five phases, its specificity is the ability to develop torques of comparable values under three kinds of supply: with only first, third or both first and third sinusoidal currents. This property, due to first (E1) and third (E3) harmonic electromotive forces (emf) of comparable values, gives more degrees of freedom for the control of the machine. Unlike three-phase sinusoidal machine, flux weakening is no more the unique solution when maximum voltage is reached. Thanks to the extra degrees of freedom in this kind of machines, more possibilities for the control of the torque and current supply can be applied. At first, elements for the choice of slots/poles combination of such DP machines are given. Then, in case of an Interior Permanent Magnet Synchronous Machine (IPMSM), possible adaptations of the rotor are proposed in order to bring the double p/3p polarity property. The last design criterion considered is the level of eddy-current losses, important at high frequencies. For proof of the concept effectiveness, a prototype with a five-phase fractional-slot concentrated winding of 40 slots and 16/48 poles is presented with results from experimental set-up and Finite Element modeling. A comparison with equivalent no-fault-tolerant three-phase 24 slots /16 poles machines is also carried out.Multi-criteria based design approach of multiphase permanent magnet low speed synchronous machines
http://hdl.handle.net/10985/6957
Multi-criteria based design approach of multiphase permanent magnet low speed synchronous machines
CHARPENTIER, Jean-Frederic; LETELLIER, Paul; SEMAIL, Eric; SCUILLER, Franck
A design methodology dedicated to multi-phase permanent magnet synchronous machines (PMSMs) supplied by pulse width modulation voltage source inverters (PWM VSIs) is presented. First, opportunities for increasing torque density using the harmonics are considered. The specific constraints caused by the PWM supply of multi-phase machines are also taken into account during the design phase. All the defined constraints are expressed in a simple manner by using a multi-machine modelling of the multi-phase machines. This multi-machine design is then applied to meet the specifications of a marine propeller: verifying simultaneously four design constraints, an initial 60-pole three-phase machine is converted into a 58-pole five-phase machine without changing the geometry and the active volume (iron, copper and magnet). First, a specific fractional-slot winding, which yields to good characteristics for PWM supply and winding factors, is chosen. Then, using this winding, the magnet layer is designed to improve the flux focussing. According to analytical and numerical calculations, the five-phase machine provides a higher torque (about 15%) and less pulsating torque (71% lower) than the initial three-phase machine with the same copper losses.
Version éditeur disponible à cette adresse : http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4797497&isnumber=4797494
Thu, 01 Jan 2009 00:00:00 GMThttp://hdl.handle.net/10985/69572009-01-01T00:00:00ZCHARPENTIER, Jean-FredericLETELLIER, PaulSEMAIL, EricSCUILLER, FranckA design methodology dedicated to multi-phase permanent magnet synchronous machines (PMSMs) supplied by pulse width modulation voltage source inverters (PWM VSIs) is presented. First, opportunities for increasing torque density using the harmonics are considered. The specific constraints caused by the PWM supply of multi-phase machines are also taken into account during the design phase. All the defined constraints are expressed in a simple manner by using a multi-machine modelling of the multi-phase machines. This multi-machine design is then applied to meet the specifications of a marine propeller: verifying simultaneously four design constraints, an initial 60-pole three-phase machine is converted into a 58-pole five-phase machine without changing the geometry and the active volume (iron, copper and magnet). First, a specific fractional-slot winding, which yields to good characteristics for PWM supply and winding factors, is chosen. Then, using this winding, the magnet layer is designed to improve the flux focussing. According to analytical and numerical calculations, the five-phase machine provides a higher torque (about 15%) and less pulsating torque (71% lower) than the initial three-phase machine with the same copper losses.Influence of Fixed-Pitch Tidal Turbine Hydrodynamic Characteristic on the Generator Design
http://hdl.handle.net/10985/10010
Influence of Fixed-Pitch Tidal Turbine Hydrodynamic Characteristic on the Generator Design
DJEBARRI, Sofiane; CHARPENTIER, Jean-Frederic; BENBOUZID, Mohamed; SCUILLER, Franck
This paper deals with the global design of direct driven permanent magnet (PM) generator associated with fixedpitch turbine for tidal energy generation. A global design approach of the generator design is proposed which takes into account the tidal site energy potential, the turbine hydrodynamic characteristic, the converter characteristics and an original power levelling control strategy. Because the considered turbine is without variable pitch control, the power levelling strategy is only based on torque/speed electrical control of the generator. Applying this global design process, it can be shown that the hydrodynamic characteristic (shape of the power coefficient curve (Cp)) have strong effects on the final design of the generator. The aim of the presented work is to evaluate this influence. Two Cp curves are considered for the same resource, turbine diameter and rated power. The obtained designs are compared in terms of cost and mass of the active parts and power factor of the generator. In the last part of the paper, the qualitative influence of the shape of the different parts of the Cp curve on the generator design is discussed.
Thu, 01 Jan 2015 00:00:00 GMThttp://hdl.handle.net/10985/100102015-01-01T00:00:00ZDJEBARRI, SofianeCHARPENTIER, Jean-FredericBENBOUZID, MohamedSCUILLER, FranckThis paper deals with the global design of direct driven permanent magnet (PM) generator associated with fixedpitch turbine for tidal energy generation. A global design approach of the generator design is proposed which takes into account the tidal site energy potential, the turbine hydrodynamic characteristic, the converter characteristics and an original power levelling control strategy. Because the considered turbine is without variable pitch control, the power levelling strategy is only based on torque/speed electrical control of the generator. Applying this global design process, it can be shown that the hydrodynamic characteristic (shape of the power coefficient curve (Cp)) have strong effects on the final design of the generator. The aim of the presented work is to evaluate this influence. Two Cp curves are considered for the same resource, turbine diameter and rated power. The obtained designs are compared in terms of cost and mass of the active parts and power factor of the generator. In the last part of the paper, the qualitative influence of the shape of the different parts of the Cp curve on the generator design is discussed.Five-phase version of 12slots/8poles three-phase Synchronous Machine for Marine-propulsion
http://hdl.handle.net/10985/8654
Five-phase version of 12slots/8poles three-phase Synchronous Machine for Marine-propulsion
ZAHR, Hussein; SEMAIL, Eric; SCUILLER, Franck
Multiphase machines are widely used in electric marine propulsion especially because of their fault-tolerance which allows to guarantee the propulsion even if a fault occurs in the electrical system. Besides, the 12 slots/8 poles three-phase machine (12/8/3 machine) with fractional slot concentrated windings is known for its low level of permanent Magnet eddy currents losses, making it adequate for compact high speeds applications. Since this interesting property is due to a 0.5 value for the number of slots per pole and per phase (spp=0.5), then the paper examines a five-phase 20 slots/8poles (20/8/5 machine) fault tolerant machine whose spp=0.5. Using an analytical model, the copper losses and an estimation of the magnet losses for the two machines are presented and a comparison is done between the two machines. The results show that the 20/8/5 has more Joules losses than 12/8/3 but lower magnet eddy current losses. Since the Joules losses can be easily evacuated more than the magnet losses, the 20/8/5 machine can be considered as the fault tolerant version of the 12/8/3 machine. Finally, the overall losses for the two machines are computed, the losses in 20/8/5 machine are less than in 12/8/3 machine. A finite element calculation is carried out in order to validate the analytical predictions.
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/10985/86542014-01-01T00:00:00ZZAHR, HusseinSEMAIL, EricSCUILLER, FranckMultiphase machines are widely used in electric marine propulsion especially because of their fault-tolerance which allows to guarantee the propulsion even if a fault occurs in the electrical system. Besides, the 12 slots/8 poles three-phase machine (12/8/3 machine) with fractional slot concentrated windings is known for its low level of permanent Magnet eddy currents losses, making it adequate for compact high speeds applications. Since this interesting property is due to a 0.5 value for the number of slots per pole and per phase (spp=0.5), then the paper examines a five-phase 20 slots/8poles (20/8/5 machine) fault tolerant machine whose spp=0.5. Using an analytical model, the copper losses and an estimation of the magnet losses for the two machines are presented and a comparison is done between the two machines. The results show that the 20/8/5 has more Joules losses than 12/8/3 but lower magnet eddy current losses. Since the Joules losses can be easily evacuated more than the magnet losses, the 20/8/5 machine can be considered as the fault tolerant version of the 12/8/3 machine. Finally, the overall losses for the two machines are computed, the losses in 20/8/5 machine are less than in 12/8/3 machine. A finite element calculation is carried out in order to validate the analytical predictions.Five-phase SPM machine with electronic pole changing effect for marine propulsion
http://hdl.handle.net/10985/12999
Five-phase SPM machine with electronic pole changing effect for marine propulsion
ZAHR, Hussein; SEMAIL, Eric; SCUILLER, Franck
In this paper, the possibility of designing a fivephase Surface-mounted Permanent Magnet (SPM) machine with 20 slots and 8 poles for a low power marine propulsion system is examined. Due to its particular winding and surface magnet design, the machine inherently offers an electronic pole changing effect from 3×4 pole pairs at low speed to 4 pole pairs at high speed. At high speed, in the constant power range, according to Finite Element Analysis, the Maximum Torque Per Ampere strategy appears not to be the right solution to minimize the whole machine losses (copper, iron and magnets). In particular, a strategy that favors the 4-pole rotating field at high speed allows to mitigate the magnet losses, thus limiting the risk of magnet overheating.
Fri, 01 Jan 2016 00:00:00 GMThttp://hdl.handle.net/10985/129992016-01-01T00:00:00ZZAHR, HusseinSEMAIL, EricSCUILLER, FranckIn this paper, the possibility of designing a fivephase Surface-mounted Permanent Magnet (SPM) machine with 20 slots and 8 poles for a low power marine propulsion system is examined. Due to its particular winding and surface magnet design, the machine inherently offers an electronic pole changing effect from 3×4 pole pairs at low speed to 4 pole pairs at high speed. At high speed, in the constant power range, according to Finite Element Analysis, the Maximum Torque Per Ampere strategy appears not to be the right solution to minimize the whole machine losses (copper, iron and magnets). In particular, a strategy that favors the 4-pole rotating field at high speed allows to mitigate the magnet losses, thus limiting the risk of magnet overheating.Effect of Rotor Bar Number on Performance of Five-Phase Induction Machine for Traction
http://hdl.handle.net/10985/13800
Effect of Rotor Bar Number on Performance of Five-Phase Induction Machine for Traction
MEKAHLIA, Abdelhak; HAMITI, Tahar; BENLAMINE, Raouf; SEMAIL, Eric; SCUILLER, Franck
The paper investigates the effect of the bar number on the performances of a five-phase squirrel-cage induction machine with fractional-slot tooth concentrated winding. With a same stator, five different rotor bar numbers are chosen and the rotor magnetic circuits are designed using an analytical approach. Then, a finite-element analysis is done under two different supply conditions: fundamental currents and third harmonic currents. Finally regarding the used winding specificities the possibility of second harmonic current supply is evaluated. The results are presented in a comparative way in order to determine the impact of rotor bar number on torque quality for the different supply modes.
Mon, 01 Jan 2018 00:00:00 GMThttp://hdl.handle.net/10985/138002018-01-01T00:00:00ZMEKAHLIA, AbdelhakHAMITI, TaharBENLAMINE, RaoufSEMAIL, EricSCUILLER, FranckThe paper investigates the effect of the bar number on the performances of a five-phase squirrel-cage induction machine with fractional-slot tooth concentrated winding. With a same stator, five different rotor bar numbers are chosen and the rotor magnetic circuits are designed using an analytical approach. Then, a finite-element analysis is done under two different supply conditions: fundamental currents and third harmonic currents. Finally regarding the used winding specificities the possibility of second harmonic current supply is evaluated. The results are presented in a comparative way in order to determine the impact of rotor bar number on torque quality for the different supply modes.Application of Flow Battery in Marine Current Turbine System for Daily Power Management
http://hdl.handle.net/10985/8773
Application of Flow Battery in Marine Current Turbine System for Daily Power Management
ZHOU, Zhibin; CHARPENTIER, Jean-Frederic; BENBOUZID, Mohamed; TANG, Tianhao; SCUILLER, Franck
Predictable tidal current resources make marine current turbine (MCT) generation system highly attractive as an electricity supply source for coastal areas and remote islands. However, the tidal speed varies greatly due to the flood and ebb tides during one day period. This results large mismatch between MCT produced power and grid-side (or load-side) demanded power. This paper focuses on a grid-connected MCT system and proposes using vanadium redox flow battery (VRB) energy storage system to manage the combined output power and to follow grid-side demand on a daily basis. The VRB model and parameter calculation process are detailed in this paper. The diesel generator (DG) system is considered as a backup power supply source in case of low battery state of charge (SoC) caused by losses during long-time battery operation. Simulations are carried-out on a grid-connected MCT system with VRB ESS to follow a given power demand profile during one day period. The results valid the proposed VRB sizing and control strategy. The DG system is demonstrated as a feasible solution to avoid VRB reaching its low SoC limitation and to guarantee the expected power injection to the local grid
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/10985/87732014-01-01T00:00:00ZZHOU, ZhibinCHARPENTIER, Jean-FredericBENBOUZID, MohamedTANG, TianhaoSCUILLER, FranckPredictable tidal current resources make marine current turbine (MCT) generation system highly attractive as an electricity supply source for coastal areas and remote islands. However, the tidal speed varies greatly due to the flood and ebb tides during one day period. This results large mismatch between MCT produced power and grid-side (or load-side) demanded power. This paper focuses on a grid-connected MCT system and proposes using vanadium redox flow battery (VRB) energy storage system to manage the combined output power and to follow grid-side demand on a daily basis. The VRB model and parameter calculation process are detailed in this paper. The diesel generator (DG) system is considered as a backup power supply source in case of low battery state of charge (SoC) caused by losses during long-time battery operation. Simulations are carried-out on a grid-connected MCT system with VRB ESS to follow a given power demand profile during one day period. The results valid the proposed VRB sizing and control strategy. The DG system is demonstrated as a feasible solution to avoid VRB reaching its low SoC limitation and to guarantee the expected power injection to the local gridDesign of a bi-harmonic 7-phase PM machine with tooth-concentrated winding
http://hdl.handle.net/10985/18335
Design of a bi-harmonic 7-phase PM machine with tooth-concentrated winding
BECKER, Florent; ZAHR, Hussein; SEMAIL, Eric; SCUILLER, Franck
If multi-phase machines equipped with tooth concentrated winding with half a slot per pole and per phase offer interesting characteristics (simplified manufacturing, no space subharmonic, fault-tolerant ability), their low fundamental winding factors make their designs and controls challenging. The paper addresses the case of a seven-phase Surface-mounted Permanent Magnet (SPM) machine which has a fundamental winding factor lower than the third. This so-called bi-harmonic specificity is considered in order to achieve good torque quality (average value and ripples). Regarding the design, the magnet layer is segmented into two identical radially magnetized tiles that cover about three-quarters the pole arc. Regarding the control, the rated Maximum Torque Per Ampere (MTPA) supply strategy (h1h3 control) aims at generating a third harmonic current component greater than the fundamental. A prototype has been manufactured: the ability of the machine to provide smooth torque is experimentally confirmed through the implementation of a simple MTPA control which copes with high distortion in no-load voltage.
Wed, 01 Jan 2020 00:00:00 GMThttp://hdl.handle.net/10985/183352020-01-01T00:00:00ZBECKER, FlorentZAHR, HusseinSEMAIL, EricSCUILLER, FranckIf multi-phase machines equipped with tooth concentrated winding with half a slot per pole and per phase offer interesting characteristics (simplified manufacturing, no space subharmonic, fault-tolerant ability), their low fundamental winding factors make their designs and controls challenging. The paper addresses the case of a seven-phase Surface-mounted Permanent Magnet (SPM) machine which has a fundamental winding factor lower than the third. This so-called bi-harmonic specificity is considered in order to achieve good torque quality (average value and ripples). Regarding the design, the magnet layer is segmented into two identical radially magnetized tiles that cover about three-quarters the pole arc. Regarding the control, the rated Maximum Torque Per Ampere (MTPA) supply strategy (h1h3 control) aims at generating a third harmonic current component greater than the fundamental. A prototype has been manufactured: the ability of the machine to provide smooth torque is experimentally confirmed through the implementation of a simple MTPA control which copes with high distortion in no-load voltage.