TY - GEN A1 - Ruiz De Larramendi, Miguel A1 - Heuser, Patrick A1 - Herranz Gracia, Mercedes T1 - Asynchronous Machine with Optimized Distribution of Electrical Losses Between Stator and Rotor (Patent) N2 - Es wird eine Asynchronmaschine (1) vorgeschlagen, wie sie insbesondere in Elektrofahrzeugen oder Hybridfahrzeugen eingesetzt werden kann. Die Asynchronmaschine (1) weist einen Rotor (5) und einen Stator (3) auf. Die Asynchronmaschine ist derart aufgebaut und angesteuert, dass sie eine Polpaarzahl p von p=3 aufweist. Aufgrund der hierdurch erreichbaren verringerten Jochsättigung kann das Statorjoch (9) mit einer geringeren Höhe hy1 ausgebildet werden, so dass ein Verhältnis von Rotoraußendurchmesser D2a zu Statoraußendurchmesser D1a Werte zwischen 0,7 und 0,8 annehmen kann. Hierdurch lassen sich im Rotor (5) vergrößerte Rotorzähne (19) und entsprechend vergrößerte Rotornuten (21) ausbilden, so dass elektrische Verluste in dem als Rotorspulenelement (23) dienenden Material in den Rotornuten (21) im Vergleich zu herkömmlichen Asynchronmaschinen geringer sind. Die als Ausgleich in dem Stator (3) verstärkt auftretenden elektrischen Verluste führen zu einer geringeren Erwärmung des Stators (3) als dies beim Rotor (5) der Fall wäre, da sich der Stator (3) mit einfachen Mitteln kühlen lässt. Insgesamt kann somit mit der vorgeschlagenen Asynchronmaschine (1) ein höheres Dauerdrehmoment erreicht werden. N2 - The invention relates to an asynchronous machine (1) as can be used particularly in electric vehicles or hybrid vehicles. The asynchronous machine (1) has a rotor (5) and a stator (3). The asynchronous machine is designed and controlled in such a manner that it has a pole pair number p of p=3. Because of the reduced yoke saturation that can consequently be achieved, the stator yoke (9) can be designed with a lesser height hy1, such that a ratio of the outer rotor diameter D2a to the outer stator diameter D1a can assume values between 0.7 and 0.8. As a result, enlarged rotor teeth (19) and correspondingly enlarged rotor grooves (21) can be formed in the rotor (5), such that electrical losses in the material in the rotor grooves (21) acting as the rotor coil element (23) are smaller in comparison to conventional asynchronous machines. The electrical losses occurring to a greater extent in the stator (3) compensating for this lead to a lesser warming of the stator (3) than would be the case with the rotor (5) as the stator (3) can be cooled by simple means. Overall, a higher continuous torque can thus be achieved with the asynchronous machine (1) according to the invention. N2 - L'invention concerne une machine asynchrone (1), pouvant être utilisée en particulier dans des véhicules électriques ou hybrides. Cette machine asynchrone (1) présente un rotor (5) et un stator (3). La machine asynchrone est conçue et commandée de sorte qu'elle présente un nombre de paires polaires p tel que p=3. La saturation de la culasse peut ainsi être réduite, ce qui permet de concevoir une culasse de stator (9) présentant une hauteur réduite hy1, de sorte que le rapport entre le diamètre extérieur de rotor D2a et le diamètre extérieur de stator D1a peut être compris entre 0,7 et 0,8. Le rotor (5) peut ainsi être pourvu de dents de rotor (19) plus grandes et donc d'encoches de rotor (21) plus grandes, ce qui permet de réduire les pertes électriques dans le matériau servant d'élément de bobine rotorique (23) dans les encoches de rotor (21) par comparaison avec les machines asynchrones classiques. Les pertes électriques accrues survenant en compensation dans le stator (3) entraînent un échauffement réduit du stator (3) comparativement à ce qui se produirait dans le rotor (5), du fait que le stator (3) peut être refroidi avec des moyens simples. La machine asynchrone (1) selon l'invention permet globalement d'obtenir un couple de rotation continu plus élevé. Y1 - 2013 UR - https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2014090440&_cid=P20-LLZ0Y3-28898-1 ER - TY - GEN A1 - Filipenko, Mykhaylo A1 - Frank, Michael A1 - Gleixner, Thomas A1 - Grundmann, Jörn A1 - Herranz Gracia, Mercedes T1 - Electrical Coil Arrangement Comprising Litz Wire Conductor Segments (Patent) N2 - Es wird eine elektrische Spulenanordnung (21) umfassend wenigstens eine Leiterwindung (wi; wl, w2) mit zwei Leiterzweigen (23a, 23b) beschrieben, von denen der erste Leiterzweig (23a) bezüglich der vorgegebenen Stromflussrichtung als Hinleiter und der zweite Leiterzweig (23b) bezüglich dieser Stromflussrichtung als Rückleiter ausgebildet ist. Dabei sind die einzelnen Leiterzweige (23a, 23b) als verpresste und mit einem gehärteten Füllmittel (40) in eine stabile Form gebrachte Litzenleiter mit einer Vielzahl von elektrisch leitfähigen Einzeldrähten (38) ausgebildet, wobei jeder einzelne Leiterzweig (23a, 23b) als separates, vorgefertigtes Leitersegment (27) gebildet ist, welches nachträglich in wenigstens einem Endbereich (17) elektrisch leitend mit einem anderen, zugeordneten Leiterzweig (23b, 23a) verbunden ist. Weiterhin werden eine elektrische Maschine (1) mit einer derartigen Spulenanordnung (21) und ein Verfahren zur Herstellung einer solchen Spulenanordnung (21) beschrieben. N2 - The invention describes an electrical coil arrangement (21) comprising at least one conductor turn (wi; wl, w2) with two conductor branches (23a, 23b), the first conductor branch (23a) of which is designed as a forward conductor with respect to the prespecified current flow direction and the second conductor branch (23b) of which is designed as a return conductor with respect to this current flow direction. In this case, the individual conductor branches (23a, 23b) are in the form of pressed litz wire conductors which are made stable by a cured filling material (40) and have a large number of electrically conductive individual wires (38), wherein each individual conductor branch (23a, 23b) is formed as a separate, prefabricated conductor segment (27) which is subsequently electrically conductively connected to one another, associated conductor branch (23b, 23a) in at least one end region (17). The invention further describes an electrical machine (1) comprising a coil arrangement (21) of this kind, and a method for producing a coil arrangement (21) of this kind. N2 - L’invention concerne un ensemble de bobine électrique (21) comprenant au moins un enroulement de conducteur (wi ; wl, w2) comportant deux branches de conducteur (23a, 23b) dont la première branche de conducteur (23a) est conçue comme conducteur aller par rapport au sens de circulation de courant prédéterminé et la seconde branche de conducteur (23b) est conçue comme conducteur de retour par rapport à ce sens de circulation de courant. Selon l’invention, les branches de conducteur individuelles (23a, 23b) sont conçues comme des conducteurs multibrins pressés qui sont amenés sous une forme stable avec une matière de remplissage durcie (40) et qui comportent une pluralité de fils individuels (38) électriquement conducteurs. Chaque branche de conducteur individuelle (23a, 23b) est formée comme un segment de conducteur préfabriqué séparé (27) qui est ensuite relié électriquement, dans au moins une zone d’extrémité (17), à une autre branche de conducteur (23b, 23a) associée. En outre, l’invention concerne une machine électrique (1) pourvue d’un tel ensemble de bobine (21) et un procédé de fabrication d’un tel ensemble de bobine (21). KW - Electrical Coil Arrangement Comprising Litz Wire Conductor Segments Y1 - 2017 UR - https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018086983&_cid=P20-KU3284-23802-1 ER - TY - GEN A1 - Ploeger, Armin A1 - Brenner, Frank A1 - Miehle, Tilman A1 - Horn, Johannes A1 - Herranz Gracia, Mercedes T1 - Rotor for an Electric Machine Having Magnets Secured by a Thermoplastic Material and Corresponding Manufacturing Method (Patent) N2 - Es wird ein Rotor für eine Elektromaschine sowie ein Verfahren zum Herstellen eines solchen Rotors beschrieben. Der Rotor (15) weist einen Rotorkörper (9) mit einer Mehrzahl von Ausnehmungen (5) und einer Mehrzahl von Magneten (7), die in die Ausnehmungen (5) des Rotorkörpers (9) aufgenommen sind, auf. Die Magneten (7) sind wenigstens teilweise von einem thermoplastischen Material umgeben und durch dieses in den Ausnehmungen (5) fixiert. Im Vergleich zu herkömmlichen duroplastischen Klebstoffen ermöglichen thermoplastische Materialien ein einfacheres, formschlüssiges Fixieren der Magneten (7) in dem Rotorkörper (9). In das thermoplastische Material (13) können magnetische oder magnetisierbare Partikel eingelagert sein, so dass ein mit dem thermoplastischen Material (13) aufgefüllter Spalt (11) zwischen den Magneten (7) und den Wandungen der Ausnehmungen (5) zum gesamten, von dem Rotor erzeugten Magnetfeld beitragen kann. N2 - The invention relates to a rotor for an electric machine and to a method for manufacturing such a rotor. The rotor (15) comprises a rotor body (9) having a plurality of holes (5) and a plurality of magnets (7) that are accommodated in the holes (5) of the rotor body (9). The magnets (7) are enclosed at least partially by a thermoplastic material and secured by the latter in the holes (5). In comparison to conventional duroplastic adhesives, the thermoplastic materials enable a simpler positive locking securing of the magnets (7) in the rotor body (9). Magnetic or magnetizable particles can be embedded in the thermoplastic material (13), such that a gap (11) between the magnets (7) and the walls of the holes (5), which gap is filled with the thermoplastic material (13), can contribute to the total magnetic field generated by the rotor. N2 - L'invention concerne un rotor pour un moteur électrique ainsi qu'un procédé pour la fabrication d'un tel rotor. Le rotor (15) présente un corps (9) de rotor pourvu d'une pluralité d'évidements (5) et d'une pluralité d'aimants (7) qui sont logés dans les évidements (5) du corps (9) du rotor. Les aimants (7) sont entourés au moins partiellement par un matériau thermoplastique et fixés par celui-ci dans les évidements (5). Par rapport aux adhésifs thermodurcissables usuels, les matériaux thermoplastiques permettent une fixation plus simple, par complémentarité de forme des aimants (7) dans le corps du rotor (9). Des particules magnétiques ou magnétisables peuvent être incorporées dans le matériau thermoplastique (13) de telle sorte qu'une fente (11) entre les aimants (7) et les parois des évidements (5), remplie du matériau thermoplastique (13), puisse contribuer au champ magnétique global, généré par le rotor. KW - Rotor for an Electric Machine Having Magnets Secured by a Thermoplastic Material and Corresponding Manufacturing Method Y1 - 2013 UR - https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2013091943&_cid=P20-KU3284-23802-1 ER - TY - GEN A1 - Frank, Michael A1 - Grundmann, Jörn A1 - Herranz Gracia, Mercedes A1 - Nick, Wolfgang T1 - Helical Winding with More Homogeneous Field Utilisation (Patent) N2 - Helixartige Wicklung mit homogenerer Feldausnutzung Es wird ein Stator (3) für eine elektrische Wechselstrom- Maschine (1) mit einer magnetischen Polzahl p angegeben, - wobei der Stator (3) eine zentrale Achse A aufweist, - wobei der Stator (3) eine Statorwicklung (4) mit einer Mehrzahl von Leiterwindungen (13j) aufweist, - wobei die einzelnen Leiterwindungen (13j) zu insgesamt n elektrischen Strängen (u, v, w) gruppiert sind, - wobei die Leiterwindungen (13j) eines Stranges jeweils wenigstens einen ersten (23a) und einen zweiten Leiterzweig (23b) aufweisen, - wobei diese Leiterzweige (23a, 23b) auf dem überwiegenden Teil (1) ihrer Länge helixartig um die zentrale Achse (A) angeordnet sind - und wobei diese helixartig angeordneten Leiterzweige (23a, 23b) jeweils eine Ganghöhe h aufweisen, die größer ist als das Produkt der axialen Länge 1 der helixartigen Leiterzweige (13j) und der Polzahl p. Weiterhin wird eine elektrische Maschine (1) mit einem derartigen Stator (3) angegeben. N2 - The invention relates to a stator (3) for an electric alternating current machine (1) with a number p of magnetic poles, wherein - the stator (3) has a central axis A, - the stator (3) has a stator winding (4) with a plurality of conductor windings (13j), - the individual conductor windings (13j) are grouped into a total of n electric phases (u, v, w), - the conductor windings (13j) of a phase each have at least a first conductor branch (23a) and a second conductor branch (23b), - said conductor branches (23a, 23b), over most (1) of the length thereof, are arranged in a helical manner around the central axis (A), and - said helically arranged conductor branches (23a, 23b) each have a pitch h greater than the product of the axial length l of the helical conductor branches (13j) and the pole number p. The invention also relates to an electric machine (1) having a stator (3) of this kind. N2 - L’invention concerne un stator (3) destiné à un moteur électrique à courant alternatif (1) comportant un nombre p de pôles magnétiques. Le stator (3) présente un axe central (A), le stator (3) présente un enroulement statorique (4) comportant une pluralité de spires conductrices (13j), les spires conductrices individuelles (13j) sont groupées pour former au total n phases électriques (u, v, w), les spires conductrices (13j) d’une phase présentent chacune au moins une première et une seconde branche conductrice (23a, 23b), lesdites branches conductrices (23a, 23b) sont agencées de manière hélicoïdale autour de l’axe central (A) sur la plus grande partie (1) de leur longueur, et lesdites branches conductrices (23a, 23b) agencées de manière hélicoïdale présentent chacune un pas h qui est plus grand que le produit de la longueur axiale 1 de la branche conductrice hélicoïdale (13j) et du nombre p de pôles. L’invention concerne par ailleurs un moteur électrique (1) muni dudit stator (3). Y1 - 2018 UR - https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018069203&_cid=P20-KU334I-31849-2 ER - TY - GEN A1 - Frank, Michael A1 - Grundmann, Jörn A1 - Herranz Gracia, Mercedes A1 - Nick, Wolfgang T1 - Helical Winding with Increased Field Use (Patent) N2 - Es wird ein Stator (3) für eine elektrische Wechselstrom-Maschine (1) mit einer magnetischen Polzahl p angegeben, - wobei der Stator (3) eine zentrale Achse A aufweist, - wobei der Stator (3) eine Statorwicklung (4) mit einer Mehrzahl von Leiterwindungen (13j) aufweist, welche jeweils zumindest in einem Teilabschnitt (l) bezüglich der zentralen Achse (A) helixartig verlaufen, - wobei die einzelnen Leiterwindungen (13j) zu insgesamt n elektrischen Strängen (u1, u2 bis w3, w4) gruppiert sind, dadurch gekennzeichnet, dass die Anzahl n der Stränge größer als drei ist, insbesondere ein ganzzahliges Vielfaches von drei. Weiterhin wird eine elektrische Maschine (1) mit einem derartigen Stator (3) angegeben. N2 - The invention relates to a stator (3) for an electric alternating-current machine (1) with a number of magnetic poles p, wherein the stator (3) comprises a central axis A, said stator (3) comprises a stator winding (4) with a plurality of conductor windings (13j), a portion (l) of each winding running helically in relation to the central axis (A), and wherein the individual conductor windings (13j) are grouped together to collectively form n phase windings (u1, u2 to w3, w4), characterised in that the number n of the phase windings is higher than three, particularly an integral multiple of three. The invention further relates to an electric machine (1) comprising such a stator (3). N2 - L'invention concerne un stator (3) pour une machine électrique à courant alternatif (1) ayant un nombre p de pôles magnétiques. Le stator (3) comprend : - un axe central A ; - un enroulement de stator (4) ayant une pluralité d’enroulements de fils (13j) qui présentent dans au moins une sous-partie (l) une forme hélicoïdale par rapport à l’axe central (A), - les enroulements de fils individuels (13j) étant regroupés en un total de n faisceaux (u1, u2 à w3, w4). Le stator est caractérisé en ce que le nombre n des faisceaux est supérieur à trois, en particulier est un multiple entier de trois. La présente invention concerne en outre une machine électrique (1) équipée d’un stator (3) de ce genre. KW - Helical Winding with Increased Field Use Y1 - 2017 UR - https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2018069517&_cid=P20-KU3284-23802-1 ER - TY - GEN A1 - Kolmorgen, Stefan A1 - Mikulec, Dragan A1 - Goetting, Gunther A1 - Herranz Gracia, Mercedes A1 - Spannhake, Stefan A1 - Raichle, Daniel A1 - Scheidle, Alexander A1 - Challand, Yves A1 - Beyer, Mario T1 - Method and Device for Operating an Externally Excited Electric Machine (Patent) N2 - Die Erfindung betrifft ein Verfahren und eine Vorrichtung zum Betrieb einer fremderregten elektrischen Maschine (1), insbesondere Synchronmaschine. Dabei werden mit Hilfe einer Sensorik eine, eine Rotortemperatur (Temp_Rotor) und/oder eine Statortemperatur charakterisierende Größe bestimmt und ein Erregerstrom (l_E) und Statorströme (l_U, l_V, l_W) für die elektrische Maschine (1) durch eine Steuereinheit (3) zumindest in vorgebbaren Betriebsbereichen in Abhängigkeit von der die Rotortemperatur (Temp_Rotor) und/oder die Statortemperatur charakterisierenden Größe festgelegt. N2 - The invention relates to a method and a device for operating an externally excited electric machine (1), in particular synchronous machine. In this context, a variable which characterizes a rotor temeperature (Temp_Rotor) and/or a stator temperature is determined using a sensor system, and an exciter current (l_E) and stator currents (l_U, l_V, l_W) for the electric machine (1) are defined by a control unit (3) at least in predefinable operating ranges as a function of the variable which characterizes the rotor temperature (Temp_Rotor) and/or the stator temperature. N2 - L'invention concerne un procédé et un dispositif pour faire fonctionner une machine électrique (1) à excitation séparée, notamment une machine synchrone. Une grandeur caractérisant une température de rotor (temp_rotor) et/ou une température de stator sont déterminées à l'aide d'un capteur; et un courant d'excitation (l_E) et des courants statoriques ((l_U, l_V, l_W) de la machine électrique (1) sont fixés au moins dans des plages de fonctionnement pouvant être prédéfinies, en fonction de la grandeur caractérisant la température de rotor (temp_rotor) et/ou la température de stator par l'intermédiaire d'une unité de commande (3). KW - Method and Device for Operating an Externally Excited Electric Machine Y1 - 2012 UR - https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2012072314&_cid=P20-KU3284-23802-1 ER - TY - GEN A1 - Kelleter, Arndt A1 - Ruiz De Larramendi, Miguel A1 - Alexander, Marcus A1 - Herranz Gracia, Mercedes A1 - Heuser, Patrick T1 - Electric Machine (Patent) N2 - Die Erfindung betrifft eine elektrische Asynchronmaschine (1), insbesondere Induktionsmaschine, umfassend: - einen zylindrischen Stator (2) mit an einem Statorjoch (21) angeordneten Statorzähnen (22), wobei ein Verhältnis einer Jochhöhe (hy1) des Statorjochs (21) in radialer Richtung zu einer Nuthöhe (hn1) der Statornuten (23) in radialer Richtung zwischen 1,75 und 2,5 beträgt; - einen zylindrischen Läufer (4) mit an einem Läuferjoch angeordneten Läuferpolen (42), die durch Kurzschlusswicklungen in einem Läuferkörper (41) definiert sind, wobei ein Verhältnis der Jochhöhe des Läuferkörpers (41) in radialer Richtung zur Nuthöhe der Läufernuten in radialer Richtung zwischen 2 und 2,75 beträgt. N2 - The invention relates to an electric asynchronous machine (1), in particular an induction machine, comprising: - a cylindrical stator (2) with stator teeth (22) on a stator yoke (21), wherein a ratio between a yoke height (hy1) of the stator yoke (21) in the radial direction and a groove height (hn1) of the stator grooves (23) in the radial direction ranges from 1.75 to 2.5; - a cylindrical rotor (4) with poles (42) on a rotor yoke which are defined by short-circuit windings in a rotor body (41), wherein a ratio between the yoke height of the rotor body (41) in the radial direction and the groove height of the rotor grooves in the radial direction ranges from 2 to 2.75. N2 - L'invention concerne une machine électrique asynchrone (1), notamment un moteur à induction, comprenant : - un stator cylindrique (2) pourvu de dents statoriques (22) disposées sur une culasse statorique (21), un rapport hauteur (hy1) de la culasse statorique (21) dans la direction radiale/hauteur (hn1) des encoches statoriques (23) dans la direction radiale étant comprise entre 1,75 et 2,5 ; - un rotor cylindrique (4) pourvu de pôles rotoriques (42) disposés sur une culasse rotorique et définis par des bobinages court-circuités dans un corps rotorique (41), un rapport hauteur de culasse du corps rotorique (41) dans la direction radiale/hauteur d'encoches rotoriques dans la direction radiale étant compris entre 2 et 2,75. Y1 - 2015 UR - https://patentscope.wipo.int/search/en/detail.jsf?docId=WO2016074828&tab=PCTBIBLIO&_cid=P20-KU336Q-32259-3 ER - TY - CHAP A1 - Schlensok, Christoph A1 - van der Giet, Michael A1 - Herranz Gracia, Mercedes A1 - van Riesen, Dirk A1 - Hameyer, Kay T1 - Structure-Dynamic Analysis of an Induction Machine depending on Stator-Housing Coupling T2 - 6th International Machine and Drives Conference, IEMDC N2 - The estimation and calculation of the acoustic sound of electric machinery is of high interest. Various approaches have been presented relying either on analytical or on numerical models. In general, the analytical models are based on the electromagnetic-field theory and the results are compared to measurements. Numerical models allow for the separation of different exciting forces stemming from various effects. In the studied case of an induction motor with squirrel-cage rotor three effects are taken into account in the analytical model: the fundamental field, saturation, and eccentricity. The numerical analysis is applied for the analysis of acoustic sound of an electric machine. Nevertheless, the numerical results have to be verified. Hence, they are compared to the physically based analytical results. The radiated noise depends directly on the surface's deformation of the machine. Therefore, the analysis is focused on the structure-dynamic vibrations. The combined analysis presented here, allows for the reduction of vibrations and noise optimizing the coupling of stator and housing. Here, an induction machine (IM) with squirrel-cage rotor is studied. Its housing is mounted with six spiral-steel springs to the stator. With the presented method the impact of different numbers of springs is analyzed. Y1 - 2007 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2007CSHousing.pdf U6 - https://doi.org/10.1109/IEMDC.2007.383657 PB - IEEE ER - TY - CHAP A1 - Hafner, Martin A1 - Henrotte, Francois A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - An energy-based harmonic constitutive law for magnetic cores with hysteresis T2 - 16th International Conference on the Computation of Electromagnetic Fields N2 - In this paper a phenomenogical energy-based harmonic ferromagnetic material model is presented which considers time-dependent hysteresis losses as a part of the material characteristic. The model is based on the effective reluctivity concept and can be applied to simulate hysteresis losses of electromechanic devices. The hysteresis losses of a C-Core are simulated and compared to the results of an iron loss estimation by loss curves. Y1 - 2007 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2007MHHarmHyst.pdf ER - TY - CHAP A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Multi-objective optimization of an induction machine using design of experiments T2 - 13th Biennial IEEE Conference on Electromagnetic Field Computation, CEFC N2 - The evaluation of the electromagnetic, structural and acoustic behavior of an induction machine is computationaly expensive. Optimization algorithms are therefore not applicable. This papers demonstrates that the methodology of design of experiments (Taguchi method) has been successfully applied for the multi-objective optimization of such multiphysics devices. A significant improvement of the machine performances can be achieved with this approach after only a few evaluations of the coupled FE model Y1 - 2008 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2008MHGDesign.pdf SP - 327 EP - 327 ER - TY - CHAP A1 - Schlensok, Christoph A1 - Brakensiek, D. A1 - Leßmann, M. A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay A1 - Henneberger, G. T1 - Simulation of permanent-magnet electrical machines and levitation systems using FEM T2 - 22nd CAD-FEM User’s Meeting Y1 - 2004 ER - TY - CHAP A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Influence of the magnetic anisotropy on electrical machines T2 - XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF N2 - Non grain-oriented electrical steel has an inherent anisotropy, which is normally neglected in the calculation of electrical machines. Moreover, the magnetic anisotropy is usually measured in small material samples. Due to the cutting effect, the magnetic anisotropy in the machine is not the same as in the sample. In this paper, the magnetic anisotropy is considered as a global problem. A method to measure it is presented and its influence on the electromagnetic and acoustic behavior is considered through the example of an induction motor. Y1 - 2007 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2008MHGInfluence.pdf ER - TY - CHAP A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Study of Temperature Rise Problems of Stepper Motors under High Duty Cycle T2 - 42nd International Symposium on Electrical Machines, SME Y1 - 2006 ER - TY - CHAP A1 - Jonas, Steffen A1 - Lengsfeld, Sebastian A1 - Jung, Marco A1 - Ponick, Bernd A1 - Herranz Gracia, Mercedes A1 - Spagnolo, Aristide A1 - Schleicher, Klaus, A1 - Schäfer, Klaus T1 - Design of a Medium Voltage Generator and Power Converter for High Power Wind Energy Conversion Systems T2 - 2020 55th International Universities Power Engineering Conference (UPEC) Y1 - 2020 U6 - https://doi.org/10.1109/UPEC49904.2020.9209886 SP - 1 EP - 5 ER - TY - CHAP A1 - Herranz Gracia, Mercedes A1 - Lange, E. A1 - Hameyer, Kay T1 - Numerical Calculation of Iron Losses in Electrical Machines with a modified Post-Processing Formula T2 - 16th International Conference on the Computation of Electromagnetic Fields, COMPUMAG Y1 - 2007 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2007MHGModified.pdf ER - TY - CHAP A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Comparison of 2D Simulation and analytical calculation of the short-circuit behaviour of a permanent-magnet synchronous machine T2 - XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF Y1 - 2005 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2005MHGShort.pdf ER - TY - CHAP A1 - Schlensok, Christoph A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Structure-Dynamic Simulation of an Induction Maschine with Eccentrically Positioned Squirrel-Cage Rotor T2 - XIII International Symposium on Electromagnetic Fields in Mechatronics, Electrical and Electronic Engineering, ISEF Y1 - 2005 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7414475 ER - TY - CHAP A1 - Schlensok, Christoph A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Combined Numerical and Analytical Method for a Geometry Optimization of a PM Motor T2 - 16th International Conference on the Computation of Electromagnetic Fields, COMPUMAG Y1 - 2005 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=1608430 ER - TY - CHAP A1 - van der Giet, Michael A1 - Rothe, R. A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Analysis of noise exciting magnetic force waves by means of numerical simulation and a space vector definition T2 - XVIII International Conference on Electrical Machines, ICEM Y1 - 2008 UR - https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=4800055 ER - TY - CHAP A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Effect of non-sinusoidal currents on the acoustic noise excitation of induction motors T2 - 13th IGTE Symposium Y1 - 2008 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2008MHGNonSin.pdf ER - TY - CHAP A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Comparision of numerical methods for the prediction of cogging torque in 2D and 3D T2 - 13th IGTE Symposium Y1 - 2008 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2008MHGCogging.pdf ER - TY - JOUR A1 - Steffen, Jonas A1 - Lengsfeld, Sebastian A1 - Jung, Marco A1 - Ponick, Bernd A1 - Herranz Gracia, Mercedes A1 - Spagnolo, Aristide A1 - Klöpzig, Markus A1 - Schleicher, Klaus A1 - Schäfer, Klaus T1 - Design of a Medium Voltage Generator with DC-Cascade for High Power Wind Energy Conversion Systems JF - Energies N2 - This paper shows a new concept to generate medium voltage (MV) in wind power application to avoid an additional transformer. Therefore, the generator must be redesigned with additional constraints and a new topology for the power rectifier system by using multiple low voltage (LV) power rectifiers connected in series and parallel to increase the DC output voltage. The combination of parallel and series connection of rectifiers is further introduced as DC-cascade. With the resulting DC-cascade, medium output voltage is achieved with low voltage rectifiers and without a bulky transformer. This approach to form a DC-cascade reduces the effort required to achieve medium DC voltage with a simple rectifier system. In this context, a suitable DC-cascade control was presented and verified with a laboratory test setup. A gearless synchronous generator, which is highly segmented so that each segment can be connected to its own power rectifier, is investigated. Due to the mixed AC and DC voltage given by the DC-cascade structure, it becomes more demanding to the design of the generator insulation, which influences the copper fill factor and the design of the cooling system. A design strategy for the overall generator design is carried out considering the new boundary conditions. Y1 - 2021 U6 - https://doi.org/10.3390/en14113106 SN - 1996-1073 VL - 14 IS - 11 ER - TY - JOUR A1 - Jacobs, Sigrid A1 - Hectors, Dietrich A1 - Henrotte, François A1 - Hafner, Martin A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay A1 - Goes, Patrick T1 - Magnetic material optimization for hybrid vehicle PMSM drives JF - World Electric Vehicle Journal N2 - The motivation of this analysis is the need of high efficiency and high power density permanent magnet synchronous motor (PMSM) drives for use in electrical vehicle power trains. It is clear that the chosen electrical steel for the lamination stack plays an important role, but proper quantification is missing. The purpose of this paper is to formalize the problem of selecting the optimal steel grade for the construction of PMSM’s. This question is important to steel producers, not only for helping customers selecting the most appropriate existing grade for their application, but also for defining the strategic orientation of the further R&D of enhanced electrical steel grades. The notion of steel efficiency is defined and, after describing the FE implementation of iron loss models, a methodology for material optimisation is proposed. Y1 - 2009 U6 - https://doi.org/10.3390/wevj3040875 SN - 2032-6653 VL - 3 IS - 4 SP - 875 EP - 883 ER - TY - JOUR A1 - Schlensok, Christoph A1 - van der Giet, Michael A1 - Herranz Gracia, Mercedes A1 - van Riesen, Dirk A1 - Hameyer, Kay T1 - Structure-Dynamic Analysis of an Induction Machine Depending on Stator-Housing Coupling JF - IEEE Transactions on Industry Applications N2 - The estimation and the calculation of the acoustic sound of electric machinery are of particular interest nowadays. Various approaches have been presented, relying either on analytical or on numerical models. The analytical models presented here are based on the electromagnetic-field theory. Numerical models are applied to derive the exciting forces stemming from various sources and effects. The numerical results have to be verified. Hence, they are compared with the physically based analytical results. The radiated noise depends directly on the surface deformation of the machine. Therefore, the analysis is focused on the structure-dynamic vibration. The combined analysis presented here allows for the reduction of vibration and noise, optimizing the coupling of the machine's stator and housing. The studied induction machine's housing is mounted with six spiral-steel springs to the stator. With the presented method, the impact of different numbers of springs is analyzed exemplarily. KW - asynchronous machines KW - finite element analysis KW - vibrationselectric machinery KW - induction machine KW - spiral-steel springs KW - stator-housing coupling KW - structure-dynamic analysis Y1 - 2008 U6 - https://doi.org/10.1109/TIA.2008.921440 SN - 0093-9994 VL - 44 IS - 3 SP - 753 EP - 759 ER - TY - JOUR A1 - Coenen, Isabel A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Influence and evaluation of non-ideal manufacturing process on the cogging torque of a permanent magnet excited synchronous machine JF - COMPEL-The international journal for computation and mathematics in electrical and electronic engineering N2 - Purpose - The purpose of this paper is to describe how a minimisation of cogging torque is performed with respect to the non-ideal manufacturing process, aiming at a robust design of the studied machine, focusing on magnetisation faults and the use of different qualities of the permanent magnet material. Design/methodology/approach - The applied methodology is a combination of design of experiments and finite element analysis to minimise the cogging torque of the estimated machine. Different qualities of the permanent magnet material are investigated by a stochastic analysis. Findings - A robust design of the machine is achieved, which is verified by a stochastic analysis. Furthermore, this analysis shows the strong influence of the magnet quality on the cogging torque. Practical implications - This paper provides a method for a machine design which is robust against non-ideal manufacturing and an approach to prove the use of a bad quality for a possible reduction of the fabrication costs. Originality/value - This paper gives a close insight on how to investigate non-ideal manufacturing and in particular its influence on the cogging torque. Y1 - 2011 U6 - https://doi.org/10.1108/03321641111110843 VL - 30 IS - 3 ER - TY - JOUR A1 - Hafner, Martin A1 - Henrotte, Francois A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - An Energy-Based Harmonic Constitutive Law for Magnetic Cores With Hysteresis JF - IEEE Transactions on Magnetics N2 - In this paper, a phenomenological energy-based material model for ferromagnetic materials under harmonic conditions is presented. The model is based on the concept of a complex effective permeability and an accurate representation of energy is adopted as identification criteria. The material model is implemented in a time-harmonic finite element model, which allows to solve for the loss characteristics of electromagnetic devices. Identification is based on measured hysteresis loops and no additional fitting parameters are required. Hysteresis losses in a ferromagnetic C-core and a ferromagnetic torus are simulated and compared to the results obtained by means of tabulated loss characteristics. Y1 - 2008 U6 - https://doi.org/10.1109/TMAG.2007.916141 VL - 44 IS - 6 SP - 922 EP - 925 PB - IEEE ER - TY - JOUR A1 - Schlensok, Christoph A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Combined Numerical and Analytical Method for Geometry Optimization of a PM Motor JF - IEEE Transactions on Magnetics N2 - For the reduction of the cogging torque of permanent-magnet synchronous machines several approaches are known. But cogging torque predictions for arbitrary types of machines using the same approach are still troublesome and imprecise. Therefore, a fast optimization process is developed and presented in this paper. Here, the combination of both numerical and analytical simulation results in such a fast method Y1 - 2006 UR - http://bib.iem.rwth-aachen.de/IEMpublications/AltesBib/2006CSCombined.pdf U6 - https://doi.org/10.1109/TMAG.2006.871379 VL - 42 IS - 4 SP - 1211 EP - 1214 PB - IEEE ER - TY - JOUR A1 - Herranz Gracia, Mercedes A1 - Hameyer, Kay T1 - Influence of the magnetic anisotropy on electrical machines JF - Advanced Computer Techniques in Applied Electromagnetics - Studies in Applied Electromagnetics and Mechanics N2 - Non grain-oriented electrical steel has an inherent anisotropy, which is normally neglected in the calculation of electrical machines. Moreover, the magnetic anisotropy is usually measured in small material samples. Due to the cutting effect, the magnetic anisotropy in the machine is not the same as in the sample. In this paper, the magnetic anisotropy is considered as a global problem. A method to measure it is presented and its influence on the electromagnetic and acoustic behavior is considered through the example of an induction motor. Y1 - 2008 U6 - https://doi.org/10.3233/978-1-58603-895-3-39 VL - 30 SP - 39 EP - 46 ER - TY - JOUR A1 - Filipenko, Mykhaylo A1 - Kühn, Lars A1 - Gleixner, Thomas A1 - Thummet, Martin A1 - Lessmann, Marc A1 - Möller, Dirk A1 - Böhm, Matthias A1 - Schröter, Andreas A1 - Häse, Kerstin A1 - Grundmann, Jörn A1 - Herranz Gracia, Mercedes T1 - Concept design of a high power superconducting generator for future hybrid-electric aircraft JF - Superconductor Science and Technology N2 - he reduction of emission is a key goals for the aviation industry. One enabling technology to achieve this goal, could be the transition from conventional gas turbines to hybrid-electric drive trains. However, the requirements concerning weight and efficiency that come from applications like short range aircraft are significantly higher than what state-of-the-art technology can offer. A key technology that potentially allows to achieve the necessary power and volume densities for rotating electric machines is superconductivity. In this paper we present the concept of a high power density generator that matches the speed of typical airborne turbines in its power class. The design is based on studies that cover topology selection and further electromagnetic, HTS, thermal, structural and cryogenics aspects. All domains were analyzed by means of analytical sizing and 2D/3D FEA modeling. With the help of our digital twin that is a synthesis of these models, we can demonstrate for the first time that under realistic assumptions on material properties gravimetric power densities beyond 20 kW kg−1 can be achieved. Y1 - 2020 U6 - https://doi.org/10.1088/1361-6668/ab695a VL - 33 IS - 5 SP - 054002 EP - 054002 ER - TY - CHAP A1 - Müller, Marcel A1 - Heilmann, Marcel A1 - Herranz Gracia, Mercedes A1 - Kempkes, Joachim A1 - Häfner, Martin A1 - Becher, Manuel ED - Forschungsvereinigung Antriebstechnik e.V., T1 - Consideration of the influence of manufacturing tolerances in the design process of electrical machines using the example of a permanent magnet synchronous machine N2 - The production process of electrical machines is subject to manufacturing and material tolerances. These tolerances have an influence on both, the mean torque and the torque ripple. Consequently, they exert an active influence on the speed-torque map (operating points), as well as the equivalent circuit diagram parameters for a permanent magnet synchronous machine, and the operational behavior (efficiency, noise development) of the electrical machine. In addition to striving lower costs, there is a growing emphasis on achieving higher energy efficiency. Thus, an accurate prediction of machine parameters is still essential during the early development process, despite manufacturing-related deviations. In this study, the prediction of machine parameters is demonstrated using the example of a PMSM. KW - manufacturing and material tolerances KW - reduced order model KW - Maximum Torque per Ampere KW - Monte Carlo Simulation KW - Sensitivity Analysis Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-47594 ER - TY - CHAP A1 - Schuler, Max A1 - Herranz Gracia, Mercedes A1 - Kempkes, Joachim A1 - Heilmann, Marcel ED - Forschungsvereinigung Antriebstechnik e.V., T1 - PyEMMO - a Python based software for the finite element modelling of electrical machines in ONELAB T2 - 15. International conference on electric vehicle drives and e-mobility N2 - Multi-objective optimizations are almost essential in the design process of electrical machines due to constantly increasing requirements for efficiency and power density. In this context, open-source simulation software offers the possibility to parallelize calculations free of license costs and thus to achieve a reduced calculation time. This paper presents the software project PyEMMO (Python Electrical Machine Modeling in ONELAB) for the finite element simulation of electrical machines in the open source program ONELAB. The object-oriented program structure and the objectives of the project are the main focus. Furthermore, the latest features are discussed, which include the geometry definition via a toolbox system, the simulation data interface based on the JSON file format and the calculation of iron losses. N2 - Multizieloptimierungen sind im Designprozess elektrischer Maschinen aufgrund stetig steigender Anforderungen an Wirkungsgrad und Leistungsdichte nahezu unabdingbar. Dabei bietet Open-Source Simulationssoftware die Möglichkeit lizenzkostenfrei Berechnungen zu parallelisieren und somit eine reduzierte Berechnungszeit zu erreichen. Dieser Beitrag stellt das hierfür initiierte Softwareprojekt PyEMMO (Python Electrical Machine Modeling in ONELAB) für die Finite-Elemente-Simulation elektrischer Maschinen im Open-Source-Programm ONELAB vor. Die objektorientierte Programmstruktur und die Ziele des Projekts stehen hierbei im Vordergrund. Des Weiteren wird auf den aktuellen Funktionsumfang eingegangen, welcher unter anderem die Geometriedefinition über ein Baukastensystem, das Simulationsdateninterface basierend auf dem JSON-Dateiformat und die Berechnung der Eisenverluste beinhaltet. KW - Open-Source KW - Finite-Elemente-Simulation KW - FEA KW - finite element analysis KW - electrical machines KW - finite element modeling KW - Open-Source software KW - Simulation software KW - ONELAB KW - Gmsh KW - GetDP Y1 - 2023 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:863-opus-55489 ER -