Axial Magnetic Fields at the Ends of a Synchronous Generator at Different Points of Operation

Marcusson, Birger; Lundin, Urban

doi:10.1109/tmag.2014.2347269

Cited by 8 publications

(3 citation statements)

References 13 publications

(15 reference statements)

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“…Although a 3D model [25], [26] would be ideal for the electromagnetic analysis of the generator described in this section, all the above confirms the validity of the built 2D FE model of the 4MVA salient-pole SG. As can be observed, the obtained FE results, when compared to the experimental ones, give an accurate match at each load condition.…”

Section: Conclusive Considerations On the Fe Modelmentioning

confidence: 62%

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Nuzzo

Galea

Gerada

et al. 2017

IEEE Trans. Ind. Electron.

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Abstract-The benefits of implementing a damper winding in salient-pole, synchronous generators are widely known and well consolidated. It is also well known that such a winding incurs extra losses in the machine due to a number of reasons. In order to improve the overall efficiency and performance of classical salientpole, wound field, synchronous generators that employ the traditional damper cage, an improved amortisseur winding topology that reduces the inherent loss is proposed and investigated in this paper. This is essential in order to meet modern power quality requirements and to improve the overall performance of such 'classical' machines. The new topology addresses the requirements for lower loss components without compromising the acceptable values of the output voltage total harmonic distortion and achieves this by having a modulated damper bar pitch. As vessel for studying the proposed concept, a 4MVA, salient-pole, synchronous generator is considered. A finite element model of this machine is first built and then validated against experimental results. The validated model is then used to investigate the proposed concept with an optimal solution being achieved via the implementation of a genetic algorithm optimization tool. Finally, the performance of the optimised machine is compared to the original design both at steady state and transient operating conditions.

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Section: Conclusive Considerations On the Fe Modelmentioning

confidence: 62%

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Nuzzo

Galea

Gerada

et al. 2017

IEEE Trans. Ind. Electron.

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“…The other one is the contribution from magnetized bodies (in particular arch-shaped in this paper) that tend to appear in the machine geometries (e.g., machine overhangs). In particular, the combination of radial and axial fields appear as an edge-effect in the classical radialflux machines [2]- [5]. Overhang structures can sometimes be used to increase the flux density in the air gap.…”

Section: Introductionmentioning

confidence: 99%

Generalized and Reduced Analytical Formulation for Ultra-Fast 3-D Field and Vector Potential Calculation From Arch-Shaped Axially Magnetized Bodies in Electrical Machines

2020

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Arch-shaped axially magnetized bodies tend to appear frequently in electrical machine analysis such as in overhang parts of classical radial-flux machines as well as in main parts of axial-flux machines. The calculation of 3-D fields originating from these bodies is demanding. 3-D FEA suffers from high computational burden as well as no knowledge of the field origin. Analytic techniques involve the use of elliptic integrals and complex numbers for numerical evaluation, which makes them significantly slower than 3-D FEA.In this paper, a new analytical technique is proposed to speed up the computation by factor 20 for the global magnetic field created by a generic magnetized body, by removing complex numbers and reducing the analytic equations significantly without any loss of precision. As a result, it can compete with conventional 3-D FEA. In addition, integral methods may contribute to the wider use of parallel processing techniques. The original expressions for the vector potential are also provided, which has its own benefits and applications. Finally, the showcased magnetized body is assessed against 3-D FEA and discussed in terms of practical applications.

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“…Generally, off-plane flux measurements tend to be laborious and are performed mostly on specially prepared model cores of laminated machines. A well-known method for flux detection is the usage of Hall-effect sensors, located at different core locations, as performed in [ 13 ] for a synchronous generator. However, even the thinnest sensors are about 1 mm thick and appropriate for measurements only on the surface, not in the core interior.…”

Section: Introductionmentioning

confidence: 99%

3D-Printed Detector Band for Magnetic Off-Plane Flux Measurements in Laminated Machine Cores

Shilyashki

Pfützner

Palkovits

et al. 2017

Sensors

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Laminated soft magnetic cores of transformers, rotating machines etc. may exhibit complex 3D flux distributions with pronounced normal fluxes (off-plane fluxes), perpendicular to the plane of magnetization. As recent research activities have shown, detections of off-plane fluxes tend to be essential for the optimization of core performances aiming at a reduction of core losses and of audible noise. Conventional sensors for off-plane flux measurements tend to be either of high thickness, influencing the measured fluxes significantly, or require laborious preparations. In the current work, thin novel detector bands for effective and simple off-plane flux detections in laminated machine cores were manufactured. They are printed in an automatic way by an in-house developed 3D/2D assembler. The latter enables a unique combination of conductive and non-conductive materials. The detector bands were effectively tested in the interior of a two-package, three-phase model transformer core. They proved to be mechanically resilient, even for strong clamping of the core.

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Axial Magnetic Fields at the Ends of a Synchronous Generator at Different Points of Operation

Cited by 8 publications

References 13 publications

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Improved Damper Cage Design for Salient-Pole Synchronous Generators

Generalized and Reduced Analytical Formulation for Ultra-Fast 3-D Field and Vector Potential Calculation From Arch-Shaped Axially Magnetized Bodies in Electrical Machines

3D-Printed Detector Band for Magnetic Off-Plane Flux Measurements in Laminated Machine Cores

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