A. Binder

Technical University Darmstadt, Darmstadt, Hesse, Germany

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Publications (83)31.55 Total impact

  • B. Funieru, A. Binder
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    ABSTRACT: The design of a direct drive PM synchronous generator for a tidal stream subsea turbine is presented in this paper. The generator design must comply with a set of very narrow restrictions concerning the available volume, the required output, the maximum current of the three-phase marine cable and the inverter maximum voltage. For these reasons the obtained design is not able to completely fulfill the requirements, especially for the case of short time overload. The results show however the feasibility of the concept. With a relatively small correction of the requirements it will be possible to obtain the required results.
    Clean Electrical Power (ICCEP), 2013 International Conference on; 01/2013
  • O. Magdun, S. Blatt, A. Binder
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    ABSTRACT: Transmission line models are commonly used to calculate and predict the voltage distributions along the inverter-fed electrical machine windings. In this paper, frequency-dependent parameters of the stator windings are calculated via finite element and analytical methods. They are implemented in a transmission line model to predict the voltage distribution in a round wire stator winding induction machine. As a difference from the existent models, the laminated iron core effects are taken into account by an eddy current loss resistance. A metal-oxide varistor model is implemented in the cable-machine winding simulation model, and the voltage distribution is calculated. Comparisons with the measurements are given.
    Diagnostics for Electric Machines, Power Electronics and Drives (SDEMPED), 2013 9th IEEE International Symposium on; 01/2013
  • O. Magdun, Y. Gemeinder, A. Binder
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    ABSTRACT: The circulating bearing current depends on the common mode stator ground current and the stator laminated core impedance, but also on the bearing impedances and on the rotor impedance of the circulating bearing current path. In the literature, the rotor impedance was neglected, or it was considered as a small air gap and end-winding cavity inductance. It is shown here by calculation and measurement that the rotor impedance is not negligible, and it is much larger than the air gap and end-winding cavity inductance. Moreover, it is shown that the circulating bearing currents can be mitigated, if the rotor impedance is increased by at least ten times the stator impedance. For increasing the rotor impedance, nanocrystalline magnetic materials are added on the machine shaft. The circulating bearing currents are measured for a standard 110 kW machine and for the same machine with the increased rotor impedance.
    Energy Conversion Congress and Exposition (ECCE), 2013 IEEE; 01/2013
  • [show abstract] [hide abstract]
    ABSTRACT: This paper presents a method for the calculation of eddy current losses in the permanent magnets, which takes into account the reaction of induced eddy currents. The developed quasi-3-D analytical method considers the effects of axial and circumferential segmentation of magnets. The 2-D time-stepping finite element method and 3-D time harmonic finite element method are used to evaluate the accuracy of the analytical method. A high speed surface-mounted permanent magnet motor with Samarium Cobalt magnets is used for detailed simulations. High-frequency time harmonics of the inverter are considered for analysis of magnet eddy current losses. The novelty of the proposed analytical method is the direct consideration of the reaction of induced eddy currents in the magnets due to travelling and pulsating field waves.
    IEEE Transactions on Magnetics 12/2012; 48(12):4831-4841. · 1.42 Impact Factor
  • O. Magdun, A. Binder
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    ABSTRACT: In order to calculate the common mode currents and induced shaft voltages in the inverter fed AC machines, a 2D finite element (FE) common mode impedance model of the laminated iron core, assuming the rotational symmetry and the uniform radial current distribution in the lamination sheets, has been proposed in the literature. In this paper, as an alternative to the existent 2D FEM models, a 3D FEM model of the iron laminated core is proposed to calculate the iron core impedance per phase. The proposed 3D FEM model considers better the radial distribution of the common mode current in the stator lamination sheets. The iron core impedance per phase is used to calculate the peak values of the most significant harmonics of the common mode current and of the induced shaft voltage.
    Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012 International Symposium on; 01/2012
  • B. Funieru, A. Binder
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    ABSTRACT: This paper presents a fast simplified FEM calculation of electrical machines, which includes end effects. The considered machine size and power is similar to a 2.5 MW permanent magnet direct drive wind generator, and was simulated as a linear machine. The calculation uses a 3D model with a reduced length of the iron stack, and the full result is generated from the reduced length model and a 2D model of the cross-section of the inside region of the machine. The length of the reduced length 3D model, that is necessary for obtaining relevant calculation results, is analyzed here for different air gap sizes. A simple rule of the thumb for the necessary minimum axial length of the reduced length model can be derived from the presented numerical calculation results.
    Electrical Machines (ICEM), 2012 XXth International Conference on; 01/2012
  • G. Munteanu, A. Binder, S. Dewenter
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    ABSTRACT: A novel type of “bearingless” permanent magnet (PM) synchronous motor is presented. The motor consists of two conical air gap bearingless PM half-motors, mounted on a single shaft. Each conical stator houses two separate three-phase distributed AC windings with different magnetic pole pair counts. The motor winding has the same pole count as the PM rotor for the generation of the torque and the axial force. For time invariant radial levitation forces, the second winding (the levitation winding) must have one pole pair more or less than the rotor PM field. It must be fed with the same electrical frequency as the motor winding. With this drive arrangement all six degrees of freedom of the rigid rotor can be actively stabilized and controlled without using any further active magnetic bearings. A prototype with a rated mechanical output power of 1 kW at a rated speed of 18 000 rpm has been designed and built, in order to validate the theory.
    Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012 International Symposium on; 01/2012
  • H. Gholizad, A. Binder
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    ABSTRACT: Basic principles of a new type of induction motor, called Variable Impedance (Z) Induction Motor (VZIM), are introduced. The main goal of implementing this new structure of induction motors is to counteract the existing compromise in the design stage of induction motors between high starting torque at standstill and high breakdown torque and high efficiency at rated speed by combining these features, using a special motor structure. A sectionalized cage rotor with different bar shapes for each sub-cage section is used. In a 3-section rotor configuration, two sub-cages with high and medium resistance are placed inside the stator bore at standstill, to increase the starting torque and to reduce the starting current. During start-up of the motor, a centrifugal mechanism moves the rotor into the axial direction and puts the third section of the rotor cage with low resistance, together with the middle sub-cage, inside the stator bore to reduce the rotor losses at rated speed, which leads to increased efficiency at nominal operation. A 22 kW, 4 pole prototype motor has been built and tested. In this paper the design procedure, the simulation and measurement results of the test motor are presented.
    Power Electronics, Electrical Drives, Automation and Motion (SPEEDAM), 2012 International Symposium on; 01/2012
  • O. Magdun, A. Binder
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    ABSTRACT: The representation of induction machine parameters, according to the high-frequency (HF) behavior of the machine impedances, has been previously presented in the literature. Methods to extract them from the measured HF machine impedances have been also presented. It has been found that a representation of the distributed stator winding-to-stator frame capacitances by two capacitances, for lower frequencies (1 kHz ... 100 kHz) and higher frequencies (1 MHz ... 10 MHz) is very convenient for studying HF effects in induction machines. Until now, a method to calculate these two capacitances from the machine design data was not available. In this paper, a method to calculate the HF model capacitances from the machine design data is presented, and further, based on several experimental investigations, their physical explanation is given. Also, a new frequency-response model of the induction machine is proposed and the common mode stator ground current is calculated. The physical interpretation of all these HF machine parameters is given, and their influence on the common mode ground current is shown.
    Electrical Machines (ICEM), 2012 XXth International Conference on; 01/2012
  • T. Knopik, A. Binder
    01/2011;
  • M. Mirzaei, B. Funieru, A. Binder
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    ABSTRACT: This paper presents analytical formulations and 3D finite element calculations for the analysis of effects of the contact resistance between two poorly insulated magnet segments regarding eddy current losses. The calculations deal with low speed large direct drive permanent magnet wind turbine generators. The analytical and finite element results are compared for different contact conductivities. The analysis considers the low frequency harmonics of the concentrated stator winding neglecting the eddy current self field.
    Computation in Electromagnetics (CEM 2011), IET 8th International Conference on; 01/2011
  • [show abstract] [hide abstract]
    ABSTRACT: The losses and the temperature rise of a high- speed "bearingless" permanent magnet (PM) synchronous motor prototype, designed for 40 kW at 40,000 rpm, represent the focus of this paper. A combined axial-radial permanent magnet (PM)-biased homo-polar magnetic bearing is responsible for the magnetic levitation along the axial and the drive-end (DE) radial direction. The "bearingless" motor unit supplies the torque and the radial magnetic suspension of the non-drive end (NDE). Thus, the losses of such a drive can be divided in two main categories: motoring losses and magnetic suspension losses. These losses are calculated analytically and numerically and their values are verified through no-load and load measurements on the constructed prototype. Index Terms—Bearingless Motor, Losses, High-Speed, Measurement
    01/2011;
  • [show abstract] [hide abstract]
    ABSTRACT: Zusammenfassung Zwei lagerlose Hochdrehzahl-Permanentmagnet(PM)-Synchronmotorprototypen mit unterschiedlichen mechanischen und elektrischen Bemessungsdaten werden hinsichtlich Auslegung und Betriebsverhalten dargestellt. Bei "lagerlosen" Maschinen ist die für hohe Drehzahlen erforderliche magnetische Lagerung in den Aktivteil der elektrischen Maschine integriert. Der erste Prototyp BM-1 wurde für eine Drehzahl von 60.000 min–1 und eine mechanische Leistung von 500 W ausgelegt, z. B. als Antrieb für Turbovakuumpumpen. Der zweite Prototyp BM-2 hat eine erhöhte mechanische Leistung von 40 kW bei einer Bemessungsdrehzahl von 40.000 min–1, was ihn für Kompressoren und Spindelantriebe geeignet macht.
    e & i Elektrotechnik und Informationstechnik 01/2011; 128:75-80.
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    ABSTRACT: Φ Abstract - The paper deals with the calculation of the common-mode (CM) voltage and the electrostatic induced voltage across the bearings in the small power inverter-fed AC machines with wound round wire windings. A method for the calculation of the bearing voltage directly from the CM voltage at the neutral point has been previously proposed in the literature. In this paper, a new representation of the stator winding, which is verified experimentally, is proposed to be easily implemented in a simulation software tool for the calculation of the CM voltage. Moreover, an accurate calculation of the bearing voltage from the integral of the CM current, via the bearing voltage ratio, is proposed. The EDM currents and the bearing threshold voltages, which are responsible for the occurrence of the fusion craters, electrical pitting or fluting of the lubricated bearing surfaces, are also calculated.
    01/2011;
  • H. Gholizad, A. Binder
    [show abstract] [hide abstract]
    ABSTRACT: A new concept of a variable impedance (Z) induction motor (VZIM) is introduced in order to combine high starting torque and high efficiency at the nominal operating point. In this type of induction motors a sectionalized cage rotor with different bar shapes for each sub-cage section is used. At standstill, sub-cages with high resistances are placed inside the stator bore to increase the starting torque and reduce the starting current. By increasing the rotational speed, a centrifugal mechanism moves the rotor in the axial direction and brings the other sections of the rotor cage with low resistances inside the stator bore to reduce the rotor losses at rated speed. This leads to increased efficiency at nominal operation. An analytical model is presented to predict the performances of the proposed variable impedance induction machines. A 5.5 kW, 4 pole prototype motor has been built and tested. Measurement results prove the accuracy of the presented analytical model.
    01/2011;
  • T. Knopik, R. Kimmich, A. Binder
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    ABSTRACT: The electromagnetic forces due to the interaction of harmonic rotor and stator fields of various origins such as slotting, saturation, eccentricity and harmonics of the supply voltage due to inverter operation in induction machines are introduced. A modal analysis has to be done to judge, if these forces excite vibrations of the stator, which leads to noise emission of the motor. The modal analysis should take into account the mechanical boundary conditions due to machine mounting and the influence of the terminal box. As an analytical solution for this task is only hard to find and the simplifications of the structure lead to only roughly correct results, a numerical time-stepping model for Finite Element (FEM) analysis with ANSYS code is used, introducing mechanical boundary conditions, which is combined with the analytical force calculation. Measurement results of the noise power level LW for three TEFC-induction motors acc. to [1] show good coincidence with the calculation results and illustrate the improvement by using this modified calculation method.
    01/2011;
  • O. Magdun, Y. Gemeinder, A. Binder
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    ABSTRACT: To detect the worst case and the best case of the bearing operating conditions concerning the magnitude of the high frequency discharge bearing currents (“EDM currents”) and the frequency of electric discharges in the bearings of the small power inverter-fed AC motors, systematic investigations have been performed for three, 4-pole, 1.5 kW squirrel cage induction motors at different speeds, bearing loads and bearing temperatures.
    Energy Conversion Congress and Exposition (ECCE), 2010 IEEE; 10/2010
  • M. Mirzaei, A. Binder, C. Deak
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    ABSTRACT: Eddy current losses calculations in permanent magnets (PM), using 3D analytical and numerical methods are presented. Axial and circumferential segmentation effects on the reduction of eddy currents are investigated. The eddy currents are induced by the stator magnetic field space harmonics, caused by the winding distribution and the slot opening at sinusoidal current supply. Computations are done for two different three phase PM synchronous machines with surface mounted magnets and concentrated stator windings.
    Electrical Machines (ICEM), 2010 XIX International Conference on; 10/2010
  • Y. Gessese, A. Binder, B. Funieru
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    ABSTRACT: The effect of the radial rotor surface grooves on rotor losses, in the case of a 3-phase, 4-pole, 24000 rpm, axially slitted solid rotor induction motor has been studied numerically and experimentally. The study shows that through radial grooving of the rotor outer surface and thereby cutting the path for high frequency rotor harmonic currents results in considerable reduction of the rotor eddy current losses. In 2D FEM analysis the grooves are considered by correcting the rotor conductivity in harmonic currents penetration depth area.
    Power Electronics Electrical Drives Automation and Motion (SPEEDAM), 2010 International Symposium on; 07/2010
  • O. Magdun, A. Binder, Y. Gemeinder
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    ABSTRACT: A time-domain high frequency model of an induction machine, which is based on the design parameters, is proposed for calculation of common mode (CM) stator ground currents in inverter-fed AC machines. Basically, the model is an extension of the measured frequency response models and considers an adequate representation of the iron core and dielectric losses over a wide frequency range, e.g. 1 kHz-10 MHz. The proposed model eliminates the disadvantages of the transmission line models, when they are used in the design stage to calculate the CM currents.
    Optimization of Electrical and Electronic Equipment (OPTIM), 2010 12th International Conference on; 06/2010

Publication Stats

347 Citations
31.55 Total Impact Points

Institutions

  • 2003–2011
    • Technical University Darmstadt
      • Institute of Electrical Energy Conversion
      Darmstadt, Hesse, Germany
  • 2008
    • Max Planck Institute for Chemical Energy Conversion
      Mülheim-on-Ruhr, North Rhine-Westphalia, Germany
    • KU Leuven
      • Faculty of Science
      Leuven, VLG, Belgium
  • 2007
    • The University of Warwick
      • School of Engineering
      Warwick, ENG, United Kingdom
    • University of Wisconsin, Madison
      • Department of Electrical and Computer Engineering
      Madison, MS, United States