A. Binder

Technical University Darmstadt, Darmstadt, Hesse, Germany

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Publications (113)53.43 Total impact

  • B. Funieru · A. Binder
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    ABSTRACT: A calculation method, which allows a time efficient coupling of the machine stator and moving rotor parts and force calculation in electrical machines, dedicated to 3D Finite Element (FE) models, is presented in this paper. The method requires only a single mesh generation at the beginning of the simulation. The applied force calculation method is stabilized, using a whole air gap averaging method, which does not require a special air gap mesh. Standard tetrahedral mesh elements can be used in the air gap, without affecting the torque or force calculation results even for the numerically demanding cogging torque calculation.
    No preview · Article · Nov 2014
  • Yves Gemeinder · Gael Messager · Andreas Binder
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    ABSTRACT: A synthetic test bench with two different voltage sources is described to investigate bearing currents, based on a lumped element model of an electrical motor. The aim of this synthetic test bench is to reproduce the voltage and current wave form at the bearing, which actually happen in bearings of inverter-fed motors, to investigate the influence of these electric quantities on bearing failures.
    No preview · Article · Sep 2014
  • Kersten Reis · Andreas Binder
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    ABSTRACT: This document deals with the development of a surface-mounted permanent magnet synchronous machine (PMSM) as direct drive with outer router, for use as traction drive inside a wheel. Based on defined requirements a focus is set on the electromagnetic design with the choice of pole count and slot count for a tooth coil winding. The thermal behaviour with a self-cooling concept is introduced. The investigated prototype machine is introduced with its main data. No-load, short-circuit and load measurements are shown as well as the validation of the cooling concept, based on measurements.
    No preview · Conference Paper · Sep 2014
  • Bjorn Deusinger · Marcel Lehr · Andreas Binder
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    ABSTRACT: The determination of the efficiency of electrical machines by direct measurements is often too imprecise if the efficiency exceeds 95 %. For electrically excited synchronous machines a standardized method exists to determine the efficiency by summation of the individual losses. This method needs a variable excitation and therefore cannot be used for permanent magnet synchronous machines. As permanent magnet machines are increasingly used as wind turbine generators and traction motors, there is a large demand for an alternative method. In this project a new procedure is developed, which consists of a calculation of the losses at rated conditions via three different measurement series. The corresponding losses and circuit diagram parameters are determined from measurements at open circuit, measurements with removed rotor and measurements with pure reactive current. In addition to the theoretical calculations direct efficiency measurements are used to validate the efficiency calculation results. The two examined permanent magnet motors with fractional slot winding have a rated power of 45 kW.
    No preview · Conference Paper · Jun 2014
  • Gael Messager · Andreas Binder
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    ABSTRACT: A Bearingless high speed drive force generation is based on the superposition of two fields of different pole pairs differing by ± 1. This paper presents a comparison of electromagnetic properties between the conventional double distributed winding topology of bearingless motors with a non-conventional design, relevant for two pole bearingless drives. It will focus especially on the design equations, on the optimisation and its specific properties.
    No preview · Conference Paper · May 2014
  • Oliver Magdun · Andreas Binder
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    ABSTRACT: In this paper, several inverter-fed induction machines with rated powers between 1.5 and 240 kW are modeled for calculating the common mode (CM) stator ground current and the capacitive bearing voltage. Simple methods to extract the parameters of the high-frequency machine model from the measured CM and differential mode impedances are presented. Furthermore, the most significant parameters are given for five different machine sizes between 1.5 and 240 kW rated power. Calculation examples are provided in comparison to the experimental results.
    No preview · Article · May 2014 · IEEE Transactions on Industry Applications
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    Marcel Lehr · Kersten Reis · Andreas Binder
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    ABSTRACT: This report compares axial flux and radial flux machines for the use in wheel hub drives in terms of their electromagnetic and thermal properties. First, the differences between the topologies of the two types of machines are explained, and a theoretical comparison of the possible power densities is carried out. Then, the machines are designed, using a finite-element software with special consideration on the number of slots per pole and phase. Finally, the designs are thermally and electromagnetically compared. Zusammenfassung Der vorliegende Beitrag vergleicht Axial- und Radialfluss-Maschinen für den Einsatz in Radnabenantrieben hinsichtlich ihrer elektromagnetischen und thermischen Eigenschaften. Zunächst werden dabei die topologischen Unterschiede der beiden Maschinentypen erläutert und ein theoretischer Vergleich der möglichen Leistungsdichten durchgeführt. Anschließend werden die Maschinen unter besonderer Berücksichtigung der Lochzahl mit Hilfe der Finite-Elemente-Methode ausgelegt. Abschließend werden die Auslegungen thermisch und elektromagnetisch miteinander vergleichen.
    Preview · Article · Feb 2014 · e & i Elektrotechnik und Informationstechnik
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    ABSTRACT: A modified theory and a proposed analytical approach clarified asynchronous torque characteristics of line-starting permanent-magnet (PM) motors, taking into consideration the mutual effect among the fields due to armature current, cage-bar current, and PMs. Theoretical and analyzed results revealed that cage torque had an oscillating component with slip frequency due to magnetic saturation. This component cannot be seen in the conventional theory. It was also found that the coupling effect between PM flux and cage-bar flux caused on magnet torque larger oscillation and more significant negative dc component, compared with the case in the conventional theory. The theoretical and analyzed results were validated on the basis of experimental approaches. Results are given for a two-pole prototype motor with $P_{N} = 5$ kW, $n_{N} = 3000$ min−1, $V_{N} = 200$ V, and Y-connection.
    No preview · Article · Jan 2014 · IEEE Transactions on Energy Conversion
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    ABSTRACT: This paper presents two types of prototype line-starting permanent magnet motors for compressor drives; one is a nonsalient-pole machine, and the other is a salient-pole machine. It is proved through both the analyses and experiments that the utility of reluctance torque not only boosts steady-state characteristics but also line-starting capabilities. It was also noteworthy that the salient-pole machine in the steady-state operation could achieve not only better efficiency but also a higher power factor. Finally, the designed motors achieved a 4% to 5% increase in efficiency over all operational points, which prevented a rise in temperature by 30 K, compared with a conventional two-pole induction motor. The results are given for a two-pole prototype motor with PN = 5 kW, nN = 3000 min -1, VN = 200 V, and Y-connection.
    No preview · Article · Dec 2013 · IEEE Transactions on Energy Conversion
  • Jinou Wang · Andreas Binder
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    ABSTRACT: This paper presents a new technique to estimate the rotor position for self-sensing magnetic bearings. The current slope, which is caused by the switching voltage of the PWM amplifier, is used to estimate the rotor position. One highlight of the proposed technique is to calculate the current slope from more than two samples of currents within one PWM cycle. Thus, using multiple sampling of coil currents alone, no additional hardware than that for a current control is needed for the position estimation. The position control of a single-axis magnetic bearing, using the proposed technique, was successfully implemented.
    No preview · Conference Paper · Sep 2013
  • Oliver Magdun · Yves Gemeinder · Andreas 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.
    No preview · Conference Paper · Sep 2013
  • 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.
    No preview · Conference Paper · Jun 2013
  • Jinou Wang · A. Binder
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    ABSTRACT: This paper introduces a new approach to measure the current slope only with normal current sensors. The current slope, which is caused by voltage switching of PWM amplifiers, can be used for a sensorless control technique for magnetic bearings or electrical drives. Further, with the information of the slope, we can realize a predictive precise current control. By combining the current sensor, analogue-to-digital converter and FPGA, using the proposed multiple current sampling technique, the current slope will be calculated in hardware with the method of least squares. This sub-system acts like a virtual sensor, which delivers both current and its slope values at the given sample point.
    No preview · Conference Paper · Jan 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.
    No preview · Conference Paper · Jan 2013
  • Mehran Mirzaei · Andreas Binder · Bogdan Funieru · Marko Susic
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    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.
    No preview · Article · Dec 2012 · IEEE Transactions on Magnetics
  • Stefan Dewenter · A. Binder · Mirco Strauch
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    ABSTRACT: A simulation model for a serial hybrid bus in Matlab/Simulink is described. The model is a compromise between a low model complexity and a sufficient accuracy of the results. The electrical traction motors and the generator are modeled by static loss models and with dynamic thermal multi-body models. The static loss models are used to determine the efficiencies and the thermal multi-body models are used to determine the temperature of the components. The inverters of the traction motor and the generator are modeled with a static loss model at a constant temperature. The DC/DC-Converter, the gear box and the diesel engine are modeled with efficiency diagrams for one given temperature level. With this model it is possible to estimate the power demand and the electrical energy usage of the drive train components as well as the fuel consumption of the whole bus for a given track and load cycle. Hence the components of the drive train can be dimensioned properly, and the energy management can be optimized.
    No preview · Conference Paper · Oct 2012
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    ABSTRACT: This paper depicts an analytical way for calculating the electromagnetic characteristics and the no-load iron losses of an electrically excited synchronous traction motor with salient poles for an electric vehicle (EV). The calculations are applied on a machine design, of the Department of Electronic and Electrical Engineering of the Pohang University of Science and Technology (POSTECH), Korea. The calculation of the winding parameters such as the coil length, the resistance per phase including the current displacement effect at high frequencies in the stator winding and the stray reactance as well as the rotor pole stray flux are discussed. The magnetic characteristic is calculated, leading to the no-load and the short-circuit characteristic of the machine at a certain frequency. The analytical results are compared with numerical results, obtained by the Finite Element Software JMAG. The last part is about the analytical calculation of the no-load iron losses using the methods of Bertotti and Steinmetz. Here also a numerical result is used as a validation of the analytic approach.
    No preview · Conference Paper · Oct 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.
    No preview · Conference Paper · Sep 2012
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    ABSTRACT: In order to boost up the calculation precision of d-q space vector analysis, new approach for estimating parameters of line-starting permanent magnet motors is developed. Introducing leakage-flux and magnetizing-flux variations dependant on not only stator excitation but also rotor one, transient characteristics and steady-state performance are calculated. Thorough the comparison with finite element analysis, the validity of the proposed method is verified. Especially, it is notable that it can provide at short times accurate quasi-steady-state average torque and precise critical load torque for self-starting.
    No preview · Conference Paper · Sep 2012
  • Oliver Magdun · Andreas 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.
    No preview · Conference Paper · Sep 2012