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@inproceedings{faucris.208687058,
abstract = {Low voltage traction applications demand high torques at low speeds and
at a small design space. In order to achieve high torque densities,
manufacturers often combine high-speed machines with mechanical
gearboxes. In the past decade, flux modulation machines came up,
offering low speeds and high torque densities by utilizing the magnetic
gearing effect. The idea is to remove the mechanical gear and get a
compact direct drive solution. Now, the Vernier machines are a subgroup
of the flux modulation machines. However, literature reports very poor
power factors for Vernier machines in comparison to PM machines as the
main drawback. Nevertheless, the presented studies always assume a fixed
speed and only one single current operating point. This is correct for
fixed speed applications, e.g. pumps and blowers, but it is not correct
for traction applications, because the machine cycles dynamically
through the torque-speed curve. Therefore, this paper first investigates
the machine design requirements considering the machine control
strategies and the needs of traction applications. Furthermore, a method
to check if the design fulfills the given requirements by calculating
only a single operating point is presented. In addition, the emerging
differences between Vernier and PM machines are explained using analytic
results. Furthermore, the paper presents a power factor comparison of
torque optimized Vernier and PM machines while considering iron losses.
Thereby, the comparison covers the whole torque-speed range, including
the field weakening are},
author = {Thyroff, Dominik and Hittinger, Christoph and Hahn, Ingo},
booktitle = {2018 IEEE International Magnetics Conference (INTERMAG)},
doi = {10.1109/INTMAG.2018.8508462},
faupublication = {yes},
keywords = {finite element analysis; gears; machine control; magnetic flux; permanent magnet machines; power factor; rotors; torque; traction; machine cycles; torque-speed curve; machine design requirements; machine control strategies; single operating point; PM machines; power factor comparison; torque optimized Vernier; torque-speed range; SM Vernier outer runner machines; low voltage traction applications; high torques; low speeds; design space; high torque densities; high-speed machines; mechanical gearboxes; flux modulation machines; magnetic gearing effect; mechanical gear; compact direct drive solution; fixed speed; single current operating point; Torque; Reactive power; Magnetic flux; Gears; Trajectory; Couplings; Modulation; Vernier machine; power factor; control strategy; performance comparison},
pages = {1-4-4},
peerreviewed = {unknown},
title = {{Comparison} of the {Power} {Factor} of {SMPM} and {SM} {Vernier} {Outer} {Runner} {Machines} for {Traction} {Applications}},
year = {2018}
}
@inproceedings{faucris.106881764,
abstract = {In contrast to conventional permanent magnet machines, integrated magnetic gears exhibit different pole pairs in the stator and the rotor. Consequently, a flux modulation of the air gap magnetic field is necessary for torque transmission, wherefore additional flux modulation poles (FMPs) are used. As the number of FMPs adopts to the pole configuration of the stator and the rotor, arbitrary combinations of both are possible. This results in new degrees of freedom in the machine design process, wherefore this paper studies the advantages and disadvantages of a wide range of different stator and rotor pole configurations.},
author = {Thyroff, Dominik and Hahn, Ingo},
booktitle = {IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society},
date = {2017-10-29/2017-11-01},
doi = {10.1109/IECON.2017.8216343},
editor = {IEEE},
faupublication = {yes},
keywords = {air gaps;magnetic fields;magnetic gears;permanent magnet machines;rotors;stators;torque;air gap magnetic field;different stator;machine design;magnetic gear;outer rotor;permanent magnet machines;rotor pole;torque;Iron;Magnetic flux;Rotors;Stator windings;Torque;Integrated magnetic gear;Vernier machine;iron loss;machine design;pole configuration},
pages = {2040-2045},
title = {{Investigation} on different pole configurations of an outer rotor integrated magnetic gear},
venue = {Peking},
year = {2017}
}
@inproceedings{faucris.110579524,
abstract = {This paper introduces an integrated magnetic gear intended as direct-drive. Next, a magnetic equivalent circuit for the presented gear topology is proposed. This approach uses the principle of virtual work for torque calculation and takes magnetic leakage and saturation into account. Thereby, the approach focuses on a reduction of the computation time compared to finite element simulation. Finally, the suggested approach is verified by the results of a finite element simulation.},
author = {Thyroff, Dominik and Meier, Stefan and Hahn, Ingo},
booktitle = {Industrial Electronics Society, IECON 2015 - 41st Annual Conference of the IEEE},
date = {2015-11-09/2015-11-12},
doi = {10.1109/IECON.2015.7392543},
editor = {IEEE},
faupublication = {yes},
keywords = {integrated magnetic gear; magnetic equivalent circuit; machine design; magnetic leakage; magnetic saturation; direct-drive; integration},
pages = {2904-2908},
peerreviewed = {Yes},
title = {{Modeling} integrated magnetic gears using a magnetic equivalent circuit},
venue = {Yokohama, Japan},
year = {2015}
}
@inproceedings{faucris.119638464,
abstract = {Increasing levels of noise and vibration are early indicators for an evoluting error or defect on an electrical machine. There are many different approaches in monitoring the health of an electrical machine, e.g. noise-, vibration- or current-based methods. This paper investigates and compares different methods for noise analysis. Each method provides an own representation of the analysed signal. Therefore, the presented methods are compared regarding their suitability in analysing electrical machines. In the following sections, first the theory behind all methods is presented. Later on, selected error states are re-enacted using an induction machine. Finally, utilizing measured noise and acoustic signals allows assessing the presented methods.},
author = {Stiller, Matthias and Wagner, Johannes and Thyroff, Dominik and Hahn, Ingo},
booktitle = {2017 IEEE 11th International Symposium on Diagnostics for Electrical Machines, Power Electronics and Drives (SDEMPED)},
date = {2017-08-29/2017-09-01},
doi = {10.1109/DEMPED.2017.8062342},
editor = {IEEE},
faupublication = {yes},
isbn = {978-1-5090-0409-6},
keywords = {error detection; noise analysis; vibration analysis; analysis methods; Fourier transform; cepstrum; Hilbert-Huang-transform; signal-based methods; induction machine},
pages = {110-116},
peerreviewed = {unknown},
title = {{Comparison} of different noise analysis methods for error detection on induction machines},
venue = {Tinos},
year = {2017}
}
@inproceedings{faucris.120028524,
abstract = {It is well-known that the power factor of Vernier machines is small compared to permanent magnet machines. However, the power factor equations already derived show a huge deviation to the finite-element analysis (FEA) when used for Vernier machines with concentrated windings. Therefore, this paper develops an analytic model to calculate the power factor of Vernier machines with concentrated windings and different numbers of flux modulating poles (FMPs) and stator slots. The established model bases on the winding function theory in combination with a magnetic equivalent circuit. Consequently, equations for the q-inductance and for the no-load back-EMF of the machine are derived, thus allowing the calculation of the power factor. Thereby, the model considers stator leakage effects, as they are crucial for a good power factor estimation. Comparing the results of the Vernier machine to those of a pm machine explains the decreased power factor of Vernier machines. In addition, a FEA confirms the results of the derived model.},
author = {Thyroff, Dominik and Hittinger, Christoph and Hahn, Ingo},
booktitle = {2017 IEEE International Electric Machines and Drives Conference (IEMDC)},
date = {2017-05-21/2017-05-24},
doi = {10.1109/IEMDC.2017.8002009},
editor = {IEEE},
faupublication = {yes},
keywords = {equivalent circuits;finite element analysis;machine windings;magnetic circuits;permanent magnet machines;power factor measurement;stators;FEA;Vernier machines;analytic model;analytic power factor calculation;back-EMF;concentrated windings;finite-element analysis;flux modulating poles;magnetic equivalent circuit;permanent magnet machines;power factor estimation;stator leakage effects;stator slots;winding function theory;Analytical models;Integrated circuit modeling;Mathematical model;Reactive power;Stator windings;Windings;Vernier machine;analytic model;concentrated windings;leakage;magnetic equivalent circuit;power factor},
pages = {1-6},
title = {{Analytic} power factor calculation for vernier machines with concentrated windings},
venue = {Miami, Florida},
year = {2017}
}
@inproceedings{faucris.119749124,
author = {Hittinger, Christoph and Thyroff, Dominik and Hahn, Ingo},
booktitle = {Electric Machines and Drives Conference (IEMDC), 2017 IEEE International},
date = {2017-05-21/2017-05-24},
doi = {10.1109/IEMDC.2017.8001994},
faupublication = {yes},
peerreviewed = {unknown},
title = {{Modelling} and {Examination} of the {Influence} of a {Short}-{Circuited} {Rotor} {Winding} for {Saliency} {Tracking} of a {Machine} with a {Three}-{Phase} {Single}-{Tooth} {Winding}},
venue = {Miami, FL},
year = {2017}
}
@inproceedings{faucris.110748484,
abstract = {Vernier machines achieve high torque densities and fit the demands of direct drives due to the usage of the magnetic gearing effect. Unfortunately, Vernier machines suffer from a poor power factor. Thereby, in analytic models the power factor depends on the permeance coefficients of the ferromagnetic flux modulation poles (FMPs), thus the FMP shape influences the power factor. Therefore, this paper investigates the optimal FMP shape using a multi-objective genetic algorithm based optimization to gain the Pareto frontier. For that purpose, the algorithm creates the FMP shape autonomously. The results show that an S-shaped sideline of the FMP is beneficial.},
author = {Thyroff, Dominik and Hahn, Ingo},
booktitle = {2017 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)},
date = {2017-04-20/2017-07-21},
doi = {10.1109/WEMDCD.2017.7947733},
editor = {IEEE},
faupublication = {yes},
keywords = {Pareto optimisation;genetic algorithms;magnetic flux;motor drives;power factor;rotors;FMP shape;Pareto frontier;S-shaped sideline;Vernier machines;concentrated windings;direct drives;ferromagnetic flux modulation poles;flux modulation pole optimization;magnetic gearing effect;multiobjective genetic algorithm based optimization;permeance coefficients;power factor;Magnetic flux;Optimization;Reactive power;Rotors;Shape;Stators;Torque;Vernier machine;genetic algorithm;multi-objective optimization;power factor;tooth shape},
pages = {113-118},
peerreviewed = {Yes},
title = {{Optimization} of the flux modulation poles for {Vernier} machines with concentrated windings},
venue = {Nottingham, UK},
year = {2017}
}