SAM
https://sam.ensam.eu:443
The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.Tue, 23 Jul 2019 18:38:41 GMT2019-07-23T18:38:41ZEléments comparatifs de plusieurs technologies de génératrices à aimants permanents a entrainement direct pour hydroliennes
http://hdl.handle.net/10985/8863
Eléments comparatifs de plusieurs technologies de génératrices à aimants permanents a entrainement direct pour hydroliennes; Comparison of several Direct-Drive PM Generators for Tidal Turbines
DJEBARRI, Sofiane; CHARPENTIER, Jean-Frederic; SCUILLER, Franck; BENBOUZID, Mohamed
L’article présente la comparaison des dimensionnements de génératrices à entraînement direct pour des cahiers des charges d’hydroliennes. Deux types de structures magnétiques (à flux radial et à flux axial) sont étudiés. Nous considérons que ces deux structures peuvent être associées à une turbine à axe horizontal selon deux types de technologies d’intégration : POD et Rim-Driven. Dans un concept dit « Rim-Driven » la génératrice est disposée sur la périphérie des pales. Pour les technologies POD, la génératrice est logée dans une nacelle étanche placée au niveau de l’axe de l’hélice. Un point de dimensionnement nominal inspiré d’un projet d’hydrolienne préindustrielle est défini pour être utilisé, dans cette étude, pour le dimensionnement de ces génératrices. Les outils utilisés comprennent un modèle électromagnétique et un modèle thermique intégrés dans une procédure d’optimisation visant à minimiser le coût total des parties actives sous contraintes thermique et de rendement. Ces dimensionnements électromagnétiques des génératrices pour des configurations Rim-Driven et POD permettent de dégager des conclusions qualitatives sur le choix du type de génératrices et son mode d’accouplement avec l’hélice.; The aim of the paper is to compare the design of direct-drive permanent-magnet (PM) generators associated with horizontal axis tidal turbines. The turbine/generator couplings are here examined. These turbine/generator couplings consist of a POD and Rim-driven assembly. In a Rim-Driven association the electrical generator active parts are inserted in a duct surrounding the blades. For POD generator insertion, the electrical machine is placed in a nacelle located on the turbine axis. To achieve the generators sizing, a design rated point related to an industrial MCT is defined. The used design models include an electromagnetic model which is linked to a thermal model in an optimization procedure that goals to minimize the active parts cost. Firstly, a simple side (PM) axial flux generator and a radial flux (PM) generator are designed for a rim-driven MCT specification. For these generators sizing, a comparison of the machines active parts and the machines geometrical dimensions are carried out. Secondly, radial flux (PM) generators are designed for Rim-Driven and POD coupling with the tidal turbine and a comparison is performed for this study case. Finally, the influence of the POD diameter on the generator electromagnetic design is studied. It shows that the active parts costs are minimized, when the generator diameter is around 1/3 of the turbine diameter for the considered specifications. These performed comparisons between the considered study cases aims to help designers in their technologies choices
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/88632013-01-01T00:00:00ZDJEBARRI, SofianeCHARPENTIER, Jean-FredericSCUILLER, FranckBENBOUZID, MohamedL’article présente la comparaison des dimensionnements de génératrices à entraînement direct pour des cahiers des charges d’hydroliennes. Deux types de structures magnétiques (à flux radial et à flux axial) sont étudiés. Nous considérons que ces deux structures peuvent être associées à une turbine à axe horizontal selon deux types de technologies d’intégration : POD et Rim-Driven. Dans un concept dit « Rim-Driven » la génératrice est disposée sur la périphérie des pales. Pour les technologies POD, la génératrice est logée dans une nacelle étanche placée au niveau de l’axe de l’hélice. Un point de dimensionnement nominal inspiré d’un projet d’hydrolienne préindustrielle est défini pour être utilisé, dans cette étude, pour le dimensionnement de ces génératrices. Les outils utilisés comprennent un modèle électromagnétique et un modèle thermique intégrés dans une procédure d’optimisation visant à minimiser le coût total des parties actives sous contraintes thermique et de rendement. Ces dimensionnements électromagnétiques des génératrices pour des configurations Rim-Driven et POD permettent de dégager des conclusions qualitatives sur le choix du type de génératrices et son mode d’accouplement avec l’hélice.
The aim of the paper is to compare the design of direct-drive permanent-magnet (PM) generators associated with horizontal axis tidal turbines. The turbine/generator couplings are here examined. These turbine/generator couplings consist of a POD and Rim-driven assembly. In a Rim-Driven association the electrical generator active parts are inserted in a duct surrounding the blades. For POD generator insertion, the electrical machine is placed in a nacelle located on the turbine axis. To achieve the generators sizing, a design rated point related to an industrial MCT is defined. The used design models include an electromagnetic model which is linked to a thermal model in an optimization procedure that goals to minimize the active parts cost. Firstly, a simple side (PM) axial flux generator and a radial flux (PM) generator are designed for a rim-driven MCT specification. For these generators sizing, a comparison of the machines active parts and the machines geometrical dimensions are carried out. Secondly, radial flux (PM) generators are designed for Rim-Driven and POD coupling with the tidal turbine and a comparison is performed for this study case. Finally, the influence of the POD diameter on the generator electromagnetic design is studied. It shows that the active parts costs are minimized, when the generator diameter is around 1/3 of the turbine diameter for the considered specifications. These performed comparisons between the considered study cases aims to help designers in their technologies choicesA review of energy storage technologie sfor marine current energy systems
http://hdl.handle.net/10985/8703
A review of energy storage technologie sfor marine current energy systems
ZHOU, Zhibin; BENBOUZID, Mohamed; CHARPENTIER, Jean-Frederic; SCUILLER, Franck; TANG, Tianhao
Increasing concerns about the depletion of fossil resources and the issue of environment lead to a global need for producing more clean energy from renewable sources. Ocean is appreciated as a vast source of renewable energies. Considering marine renewable energies, it can be noticed that significant electrical power can be extracted from marine tidal currents. However, the power harnessed from marine tidal currents is highly fluctuant due to the swell effect and the periodicity of the tidal phenomenon. To improve the power quality and make the marine generation system more reliable, energy storage systems can play a crucial role. In this paper, an overview and the state of art of energy storage technologies are presented. Characteristics of various energy storage technologies are analyzed and compared for this particular application. The comparison shows that high-energy batteries like sodium–sulphur battery and flow battery are favorable for smoothing the long-period power fluctuation due to the tide phenomenon while supercapacitor and flywheel are more suitable for eliminating short-period power disturbances due to swell or turbulence phenomena. This means that hybrid storage technologies are needed for achieving optimal results in tidal marine current energy applications.
Tue, 01 Jan 2013 00:00:00 GMThttp://hdl.handle.net/10985/87032013-01-01T00:00:00ZZHOU, ZhibinBENBOUZID, MohamedCHARPENTIER, Jean-FredericSCUILLER, FranckTANG, TianhaoIncreasing concerns about the depletion of fossil resources and the issue of environment lead to a global need for producing more clean energy from renewable sources. Ocean is appreciated as a vast source of renewable energies. Considering marine renewable energies, it can be noticed that significant electrical power can be extracted from marine tidal currents. However, the power harnessed from marine tidal currents is highly fluctuant due to the swell effect and the periodicity of the tidal phenomenon. To improve the power quality and make the marine generation system more reliable, energy storage systems can play a crucial role. In this paper, an overview and the state of art of energy storage technologies are presented. Characteristics of various energy storage technologies are analyzed and compared for this particular application. The comparison shows that high-energy batteries like sodium–sulphur battery and flow battery are favorable for smoothing the long-period power fluctuation due to the tide phenomenon while supercapacitor and flywheel are more suitable for eliminating short-period power disturbances due to swell or turbulence phenomena. This means that hybrid storage technologies are needed for achieving optimal results in tidal marine current energy applications.Multi-star multi-phase winding for a high power naval propulsion machine with low ripple torques and high fault tolerant ability
http://hdl.handle.net/10985/6975
Multi-star multi-phase winding for a high power naval propulsion machine with low ripple torques and high fault tolerant ability
SCUILLER, Franck; CHARPENTIER, Jean-Frederic; SEMAIL, Eric
In this paper, an original multi-phase Surface Mounted Permanent Magnet (SMPM) Machine designed for naval propulsion is proposed. The design objective of this high power low speed machine is twofold: to enhance the fault tolerance capability of the system and to optimize the quality of the torque by reducing the electromagnetic torque ripples which underlie the acoustic behaviour of the motor and of the global mechanical structure. A low level of ripple torques must also be ensured in faulty operations. To fullfill these constraints, the machine is equipped with a fractional-slot concentrated winding made up of four 3-phase windings each one being star-connected, each star being magnetically shifted by an angle of 15 degrees. This 4-star 3-phase configuration allows to reduce the cogging torque and to separate magnetically and physically the phase windings. The end-turns are also drastically reduced, which improves the compactness and the efficiency of the machine. This original multi-phase machine is supplied by four 3-phase PWM voltage source inverter with sinusoidal current law. The magnetic independences between the four star windings allow a very simple control of the four-star supply and a straightforward fault operating mode. Moreover, this 4-star winding configuration yields to very low torque ripples in nominal configuration (four stars connected) and in faulty operations if two magnetic non adjacent stars are disconnected. For all these reasons, this structure appears particularly suitable for naval propulsion application since it increases the machine performances in terms of compactness, reliability and quality of torque.
La version éditeur est disponible à cette adresse : http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=5729185&isnumber=5728974
Fri, 01 Jan 2010 00:00:00 GMThttp://hdl.handle.net/10985/69752010-01-01T00:00:00ZSCUILLER, FranckCHARPENTIER, Jean-FredericSEMAIL, EricIn this paper, an original multi-phase Surface Mounted Permanent Magnet (SMPM) Machine designed for naval propulsion is proposed. The design objective of this high power low speed machine is twofold: to enhance the fault tolerance capability of the system and to optimize the quality of the torque by reducing the electromagnetic torque ripples which underlie the acoustic behaviour of the motor and of the global mechanical structure. A low level of ripple torques must also be ensured in faulty operations. To fullfill these constraints, the machine is equipped with a fractional-slot concentrated winding made up of four 3-phase windings each one being star-connected, each star being magnetically shifted by an angle of 15 degrees. This 4-star 3-phase configuration allows to reduce the cogging torque and to separate magnetically and physically the phase windings. The end-turns are also drastically reduced, which improves the compactness and the efficiency of the machine. This original multi-phase machine is supplied by four 3-phase PWM voltage source inverter with sinusoidal current law. The magnetic independences between the four star windings allow a very simple control of the four-star supply and a straightforward fault operating mode. Moreover, this 4-star winding configuration yields to very low torque ripples in nominal configuration (four stars connected) and in faulty operations if two magnetic non adjacent stars are disconnected. For all these reasons, this structure appears particularly suitable for naval propulsion application since it increases the machine performances in terms of compactness, reliability and quality of torque.Méthodologie de conception systémique de génératrices à aimants permanents associées avec une hélice à pas fixe : Application aux hydroliennes
http://hdl.handle.net/10985/8829
Méthodologie de conception systémique de génératrices à aimants permanents associées avec une hélice à pas fixe : Application aux hydroliennes
DJEBARRI, Sofiane; CHARPENTIER, Jean-Frederic; SCUILLER, Franck; BENBOUZID, Mohamed
Ce travail traite de la conception systémique de génératrices électriques à aimants permanents associées à des hélices marines. La conception systémique consiste à concevoir un composant de la chaîne de conversion tout en tenant compte des caractéristiques des autres composants du système. Cet article décrit une méthodologie de conception optimale spécifique pour les machines électriques à entraînement direct associées à une turbine marine à pas fixe. L’originalité de cette démarche met en évidence les critères et les contraintes de conception de la génératrice afin d’assurer son pilotage (écrêtage de la puissance à vitesse de courant élevée) sans recours au système d’orientation des pales. Le système d’orientation des pales et le multiplicateur mécanique de vitesse sont des composants coûteux, encombrants, source de défaillances et très exigeants en termes de maintenance. Ces inconvénients peuvent rendre ces éléments indésirables dans une chaîne d’entraînement pour hydrolienne, car la réduction de la maintenance est un facteur prédominant. Les résultats montrent que la génératrice dimensionnée selon la méthodologie proposée est capable d’être commandée sur tout un cycle de fonctionnement. Ceci permet alors l’écrêtage de la puissance uniquement par le contrôle électrique de la génératrice.
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/10985/88292014-01-01T00:00:00ZDJEBARRI, SofianeCHARPENTIER, Jean-FredericSCUILLER, FranckBENBOUZID, MohamedCe travail traite de la conception systémique de génératrices électriques à aimants permanents associées à des hélices marines. La conception systémique consiste à concevoir un composant de la chaîne de conversion tout en tenant compte des caractéristiques des autres composants du système. Cet article décrit une méthodologie de conception optimale spécifique pour les machines électriques à entraînement direct associées à une turbine marine à pas fixe. L’originalité de cette démarche met en évidence les critères et les contraintes de conception de la génératrice afin d’assurer son pilotage (écrêtage de la puissance à vitesse de courant élevée) sans recours au système d’orientation des pales. Le système d’orientation des pales et le multiplicateur mécanique de vitesse sont des composants coûteux, encombrants, source de défaillances et très exigeants en termes de maintenance. Ces inconvénients peuvent rendre ces éléments indésirables dans une chaîne d’entraînement pour hydrolienne, car la réduction de la maintenance est un facteur prédominant. Les résultats montrent que la génératrice dimensionnée selon la méthodologie proposée est capable d’être commandée sur tout un cycle de fonctionnement. Ceci permet alors l’écrêtage de la puissance uniquement par le contrôle électrique de la génératrice.Magnet Shape Optimization to Reduce Pulsating Torque for a Five-Phase Permanent-Magnet Low-Speed Machine
http://hdl.handle.net/10985/8440
Magnet Shape Optimization to Reduce Pulsating Torque for a Five-Phase Permanent-Magnet Low-Speed Machine
SCUILLER, Franck
Five-phase Surface-Mounted Permanent Magnet (SMPM) machines can inherently produce a smooth electromagnetic torque which can be increased when using third harmonic current injection. To really take advantage of these characteristics, the rotor magnets can be shaped in order to obtain a back-emf with large third harmonic term. This is the scope of the paper. For the design specifications of a low speed marine propulsion machine, the following objective must be achieved: to significantly mitigate the pulsating torque without reducing the average torque bearing in mind the solution where the rotor is made with full pole-pitch magnets. An analytical field computation, called equivalent coil method, is developed in order to quicly explore the magnet geometries. Thus a procedure to optimize small trapezoid notches at the surface of the pole magnets is performed. Referring to the classical fully pole-pitch magnet shape, the solution found allows a substantial reduction of the pulsating torque without reducing the torque density. Furthermore, with regard to an equivalent three-phase machine, for the same copper losses, the average torque of the optimized five-phase machine can be potentially higher if the third harmonic current injection is implemented.
The author would like to thank S. Djebarri from the Research Institute of Naval Academy for his help with computing the machines with FEA program FEMM and F. Byrne from the French Naval Academy for her English proofreading
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/10985/84402014-01-01T00:00:00ZSCUILLER, FranckFive-phase Surface-Mounted Permanent Magnet (SMPM) machines can inherently produce a smooth electromagnetic torque which can be increased when using third harmonic current injection. To really take advantage of these characteristics, the rotor magnets can be shaped in order to obtain a back-emf with large third harmonic term. This is the scope of the paper. For the design specifications of a low speed marine propulsion machine, the following objective must be achieved: to significantly mitigate the pulsating torque without reducing the average torque bearing in mind the solution where the rotor is made with full pole-pitch magnets. An analytical field computation, called equivalent coil method, is developed in order to quicly explore the magnet geometries. Thus a procedure to optimize small trapezoid notches at the surface of the pole magnets is performed. Referring to the classical fully pole-pitch magnet shape, the solution found allows a substantial reduction of the pulsating torque without reducing the torque density. Furthermore, with regard to an equivalent three-phase machine, for the same copper losses, the average torque of the optimized five-phase machine can be potentially higher if the third harmonic current injection is implemented.Five-phase SPM machine with electronic pole changing effect for marine propulsion
http://hdl.handle.net/10985/11662
Five-phase SPM machine with electronic pole changing effect for marine propulsion
ZAHR, Hussein; SCUILLER, Franck; SEMAIL, Eric
In this paper, the possibility of designing a five-phase 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/10985/116622016-01-01T00:00:00ZZAHR, HusseinSCUILLER, FranckSEMAIL, EricIn this paper, the possibility of designing a five-phase 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.An Up - to - Date Review of Large Marine Tidal Current Turbine Technologies
http://hdl.handle.net/10985/8981
An Up - to - Date Review of Large Marine Tidal Current Turbine Technologies
ZHOU, Zhibin; SCUILLER, Franck; CHARPENTIER, Jean-Frederic; BENBOUZID, Mohamed; TANG, Tianhao
Owning to the predictability of tidal current resources, marine tidal current energy is considered to be a reliable and promising renewable power source for coastal areas or some remote islands. During the last 10 years, various original horizontal axis and vertical axis marine current turbines (MCT) have been developed around the world. Although various projects have been reported in the state-of-the-art research papers in recent years, many of these projects were only at the design stage when the papers were published. In fact, some projects do not have any further developments during the several years after the first reporting. In this paper, up-to-date information about large tidal turbine projects over 500 kW is focused. The newest achievements of these large tidal current turbine technologies are presented. These technologies represent the industrial solutions for several pre-commercial MCT farm projects in the coming years. This paper provides a useful background for researchers in the marine turbine energy domain.
Wed, 01 Jan 2014 00:00:00 GMThttp://hdl.handle.net/10985/89812014-01-01T00:00:00ZZHOU, ZhibinSCUILLER, FranckCHARPENTIER, Jean-FredericBENBOUZID, MohamedTANG, TianhaoOwning to the predictability of tidal current resources, marine tidal current energy is considered to be a reliable and promising renewable power source for coastal areas or some remote islands. During the last 10 years, various original horizontal axis and vertical axis marine current turbines (MCT) have been developed around the world. Although various projects have been reported in the state-of-the-art research papers in recent years, many of these projects were only at the design stage when the papers were published. In fact, some projects do not have any further developments during the several years after the first reporting. In this paper, up-to-date information about large tidal turbine projects over 500 kW is focused. The newest achievements of these large tidal current turbine technologies are presented. These technologies represent the industrial solutions for several pre-commercial MCT farm projects in the coming years. This paper provides a useful background for researchers in the marine turbine energy domain.Comparizon of Conventional and Unconventional 5-phase PM Motor Structures for Naval Applications
http://hdl.handle.net/10985/7378
Comparizon of Conventional and Unconventional 5-phase PM Motor Structures for Naval Applications
SCUILLER, Franck; SEMAIL, Eric; CHARPENTIER, Jean-Frederic; CLENET, Stéphane
Multi-phase motors are widely used in marine propulsion. In this paper, a Multi-machine modeling of Surface Mounted PM motors is presented and applied to a 5-phase one. The latter is proved to be equivalent to a set of two-phase fictitious machines each ones being characterized by a set of specific harmonic rank. A simple control consists in supplying each fictitious machine by a current which contains only one harmonic. A five phase machine is then supplied by currents with only both first and third harmonics. Considering this kind of control, it is proved that for given stator resistance and average torque the Joule losses and the torque ripple are minimized if a simple criterion on the harmonics of electromotive force at constant speed is fullfilled. Different structures of rotor are then compared to examine numerically which improvements can be practically obtained
Thu, 01 Jan 2004 00:00:00 GMThttp://hdl.handle.net/10985/73782004-01-01T00:00:00ZSCUILLER, FranckSEMAIL, EricCHARPENTIER, Jean-FredericCLENET, StéphaneMulti-phase motors are widely used in marine propulsion. In this paper, a Multi-machine modeling of Surface Mounted PM motors is presented and applied to a 5-phase one. The latter is proved to be equivalent to a set of two-phase fictitious machines each ones being characterized by a set of specific harmonic rank. A simple control consists in supplying each fictitious machine by a current which contains only one harmonic. A five phase machine is then supplied by currents with only both first and third harmonics. Considering this kind of control, it is proved that for given stator resistance and average torque the Joule losses and the torque ripple are minimized if a simple criterion on the harmonics of electromotive force at constant speed is fullfilled. Different structures of rotor are then compared to examine numerically which improvements can be practically obtainedRough Design of a Double-Stator Axial Flux Permanent Magnet Generator for a Rim-Driven Marine Current Turbine
http://hdl.handle.net/10985/8714
Rough Design of a Double-Stator Axial Flux Permanent Magnet Generator for a Rim-Driven Marine Current Turbine
DJEBARRI, Sofiane; CHARPENTIER, Jean-Frederic; SCUILLER, Franck; BENBOUZID, Mohamed; GUEMARD, Sylvain
This paper deals with the rough design of a Double-Stator Axial Flux Permanent Magnet Machine (DSAFPM) for a rim-driven Marine Current Turbine (MCT). The DSAFPM machine will be compared to a previously developed and realized Radial Flux Permanent Magnet Machine (RFPM); given the same rim-driven MCT specifications. For that purpose, a first-order electromagnetic design model and a thermal one are developed and used to compare active part mass, cost, and thermal behavior of the two machines. The obtained results show that such a structure of poly-air gap axial flux machine can be more interesting in terms of compactness and thermal behavior for rim-driven marine current turbines.
Sun, 01 Jan 2012 00:00:00 GMThttp://hdl.handle.net/10985/87142012-01-01T00:00:00ZDJEBARRI, SofianeCHARPENTIER, Jean-FredericSCUILLER, FranckBENBOUZID, MohamedGUEMARD, SylvainThis paper deals with the rough design of a Double-Stator Axial Flux Permanent Magnet Machine (DSAFPM) for a rim-driven Marine Current Turbine (MCT). The DSAFPM machine will be compared to a previously developed and realized Radial Flux Permanent Magnet Machine (RFPM); given the same rim-driven MCT specifications. For that purpose, a first-order electromagnetic design model and a thermal one are developed and used to compare active part mass, cost, and thermal behavior of the two machines. The obtained results show that such a structure of poly-air gap axial flux machine can be more interesting in terms of compactness and thermal behavior for rim-driven marine current turbines.Comparison of Optimized Control Strategies of a High-Speed Traction Machine with Five Phases and Bi-Harmonic Electromotive Force
http://hdl.handle.net/10985/11435
Comparison of Optimized Control Strategies of a High-Speed Traction Machine with Five Phases and Bi-Harmonic Electromotive Force
ZAHR, Hussein; GONG, Jinlin; SEMAIL, Eric; SCUILLER, Franck
The purpose of the paper is to present the potentialities in terms of the control of a new kind of PM synchronous machine. With five phases and electromotive forces whose first (E1) and third (E3) harmonics are of similar amplitude, the studied machine, so-called bi-harmonic, has properties that are interesting for traction machine payload. With three-phase machines, supplied by a mono-harmonic sinusoidal current, the weak number of freedom degrees limits the strategy of control for traction machines especially when voltage saturation occurs at high speeds. As the torque is managed for three-phase machines by a current with only one harmonic, flux weakening is necessary to increase speed when the voltage limitation is reached. The studied five-phase machine, thanks to the increase in the number of freedom degrees for control, aims to alleviate this fact. In his paper, three optimized control strategies are compared in terms of efficiency and associated torque/speed characteristics. These strategies take into account numerous constraints either from the supply (with limited voltage) or from the machine (with limited current densities and maximum acceptable copper, iron and permanent magnet losses). The obtained results prove the wide potentialities of such a kind of five-phase bi-harmonic machine in terms of control under constraints. It is thus shown that the classical Maximum Torque Per Ampere (MTPA) strategy developed for the three-phase machine is clearly not satisfying on the whole range of speed because of the presence of iron losses whose values can no more be neglected at high speeds. Two other strategies have been then proposed to be able to manage the compromises, at high speeds, between the high values of torque and efficiency under the constraints of admissible total losses either in the rotor or in the stator.
Fri, 01 Jan 2016 00:00:00 GMThttp://hdl.handle.net/10985/114352016-01-01T00:00:00ZZAHR, HusseinGONG, JinlinSEMAIL, EricSCUILLER, FranckThe purpose of the paper is to present the potentialities in terms of the control of a new kind of PM synchronous machine. With five phases and electromotive forces whose first (E1) and third (E3) harmonics are of similar amplitude, the studied machine, so-called bi-harmonic, has properties that are interesting for traction machine payload. With three-phase machines, supplied by a mono-harmonic sinusoidal current, the weak number of freedom degrees limits the strategy of control for traction machines especially when voltage saturation occurs at high speeds. As the torque is managed for three-phase machines by a current with only one harmonic, flux weakening is necessary to increase speed when the voltage limitation is reached. The studied five-phase machine, thanks to the increase in the number of freedom degrees for control, aims to alleviate this fact. In his paper, three optimized control strategies are compared in terms of efficiency and associated torque/speed characteristics. These strategies take into account numerous constraints either from the supply (with limited voltage) or from the machine (with limited current densities and maximum acceptable copper, iron and permanent magnet losses). The obtained results prove the wide potentialities of such a kind of five-phase bi-harmonic machine in terms of control under constraints. It is thus shown that the classical Maximum Torque Per Ampere (MTPA) strategy developed for the three-phase machine is clearly not satisfying on the whole range of speed because of the presence of iron losses whose values can no more be neglected at high speeds. Two other strategies have been then proposed to be able to manage the compromises, at high speeds, between the high values of torque and efficiency under the constraints of admissible total losses either in the rotor or in the stator.