Electromotive force wave-shape in alternators

Adams, Comfort A.

doi:10.1109/paiee.1909.6660045

Cited by 1 publication

(3 citation statements)

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“…To circumvent this issue, a double layer winding can be used, where coils of different phases can be inserted into the same slot and thus an increased number of coils-per-phase can be achieved while keeping the same number of slots. Alternators built around this configuration were already present in the early 1900s [25]. This last concept is shown in Fig.…”

Section: Improved Winding Configurationsmentioning

confidence: 94%

“…By limiting the considered case studies to three-phase, symmetrical windings embedded in the stator of classical SGs, the simplest configuration consists of a single-layer comprising 6p slots (where p is the number of pole pairs). Alternators with such winding structure were already in use by the late 1800s [25]. If a planar scheme is considered for the stator and if only one pole pair is taken into account (corresponding to 2π electrical radians), then the described winding can be illustrated as in the grid shown in Fig.…”

Section: Improved Winding Configurationsmentioning

confidence: 99%

“…The presence of slot openings on the armature core introduces high-frequency harmonics (namely tooth ripple) on the air-gap flux. This phenomenon has been well described from the early engineering literature from the 1900s through to modern electrical machine textbooks [7,25]. These harmonics introduced onto the machine EMF are at fundamental frequency sidebands around the slotting frequency [7].…”

Section: Lamination/core Geometrymentioning

confidence: 99%

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Harmonic reduction methods for electrical generation: a review

Fallows

Nuzzo

Costabeber

et al. 2018

IET Generation, Transmission & Distribution

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This paper provides a comprehensive literature review of techniques for harmonic related power quality improvement of electrical generation systems. An increasing interest in these aspects is due to the ever more stringent power quality requirements, deriving from new grid codes and compliancy standards, aimed at limiting waveform harmonic distortion at all points of the distribution network. Although a wealth of literature is available for such techniques, it has never been compiled into a handbook incorporating all the solutions aimed at both electrical machine and power systems engineers. IntroductionIn the world of electrical power generation, a main point of consideration has always been to achieve adequate performance in terms of power quality. In this context, an important factor is the generation, management and reduction/compensation of spatial and time harmonics throughout the whole power system. From the first developments in the mid-1800s of electrical power generation and distribution systems, harmonic content improvement and reduction has evolved from a localised generator design problem to an internationally regulated supply characteristic that must be considered at all points of the power distribution network.This paper is thus aimed to be a review of harmonic improvement techniques and methodologies, organised to follow and indicate the development timeline of these methods. Distribution level generation has been chosen as the focus to align with recent changes in grid topology caused by distributed and renewable generation. In this section, the paper begins by detailing the changing nature of power quality in distribution networks followed by a description of the main types of power quality issues and an overview of the key standards governing network limits. The focus then shifts to harmonic reduction procedures and methodologies. A review of harmonic reduction methods based around the design of rotating electrical generators is developed, followed by a review of modern methods applied to new generation systems, such as renewable sources.

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Section: Improved Winding Configurationsmentioning

confidence: 94%

Section: Improved Winding Configurationsmentioning

confidence: 99%

Section: Lamination/core Geometrymentioning

confidence: 99%

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