A rapid method of analysing the m.m.f. wave of a single or polyphase winding

Burbidge, R.F.

doi:10.1049/pi-c.1958.0037

Cited by 18 publications

(5 citation statements)

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“…Once the optimal winding vector x is obtained solving (14) for either a conventional or unconventional slot-pole combination, the winding factor k w of the corresponding FSCW can be easily computed based on the well-known relationship [21]:…”

Section: A Winding Factormentioning

confidence: 99%

Investigation Into Multi-Layer Fractional-Slot Concentrated Windings With Unconventional Slot-Pole Combinations

Tessarolo

Ciriani

Bortolozzi

et al. 2019

IEEE Trans. Energy Convers.

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Fractional-slot concentrated windings (FSCWs) are an attractive option for the design of synchronous permanentmagnet machines. It is commonly assumed in the existing literature that a symmetrical three-phase FSCW is feasible only on a condition that the number of slots Z is an integer multiple of three times the maximum common divisor between Z and the number of pole pairs p. Slot-pole combinations satisfying this rule can be defined conventionally, the others unconventionally. In contrast to the common belief, this paper shows that, using a multi-layer arrangement, it is possible to synthetize a symmetrical FSCW having unconventional slot-pole combinations. A general design methodology for this purpose is presented and validated by finite element analysis. The pros and contras of FSCWs with unconventional slot-pole combinations are examined. Finally, the application of an unconventional FSCW to a shipboard surface permanent-magnet machine prototype is presented to illustrate the possible practical convenience of this kind of winding and tests on the prototype are reported for experimental validation.

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Section: A Winding Factormentioning

confidence: 99%

Investigation Into Multi-Layer Fractional-Slot Concentrated Windings With Unconventional Slot-Pole Combinations

Tessarolo

Ciriani

Bortolozzi

et al. 2019

IEEE Trans. Energy Convers.

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“…The results are all checked for a high winding factor by two different programmes depending on two different calculation methods [12][13][14][15][16][17].…”

Section: Optimization Softwarementioning

confidence: 99%

Maximum MMF reduction using the Newton Raphson method

Kocabaş¹

2008

The International Conference on Electrical Engineering

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This paper accompanies and complements a related companion paper [1]. Previous contributions have discussed the disturbing effects of space harmonics in induction motors, and several techniques to reduce or eliminate them have been proposed. Since these unwanted effects are produced by the stator winding, it is possible to eliminate or at least to significantly reduce some of the space harmonics, by changing the winding structure that is responsible for producing them. It is shown here that, by regarding the mmf waveform as a stepped function, this can be achieved by optimizing the slot positions and the number of conductors in the slots, using software designed for Matlab, and prepared using the Newton Raphson method. The conventional waveform is analyzed and optimized for convenient numbers of slots, and the necessary mathematical relationships are presented, together with equations for the chosen waveform, and a flow-chart for the associated software.

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“…The armature winding magneto motive force (MMF) is chosen as the subject of investigation. On one hand, MMF can reflect the field distribution [1], back EMF [2], [3], unbalanced magnetic force (UMF) [4], [5], vibration and noise [6], [7]. On the other hand, as a spatio-temporal entity, MMF is directly produced by…”

Section: Introductionmentioning

confidence: 99%

“…Similar mathematical treatments of MMF of fractional-slot armature windings can be seen in [11] on three-phase windings, and in [12] on general symmetrical windings. The methods of analysis from former studies are also recapitulated in [2], [13], [14], [15], and [16]. As some mathematical models for analyzing armature windings are being developed and improved, methods using these new tools to analyze armature winding MMF come into view.…”

Section: Introductionmentioning

confidence: 99%

A Versatile Analytical Method of Investigating MMF Harmonics of Armature Windings

Shen

2023

IEEE Access

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Analytical methods are of great interest for the design and analysis of AC machines. This paper proposes a new analytical method to study the harmonic rotating components of the magneto motive force (MMF) produced by various types of armature windings and input currents. The windings can be symmetrical-phase or asymmetrical-phase, single-layer or multi-layer, fractional-slot or integer-slot, with arbitrary phase numbers. The analytical method is expressed as concise steps and closed-form equations, and its validity and reliability are verified by comparison to finite element analysis (FEA) simulations and experiments. As opposed to previous works, the proposed method establishes a more comprehensive quantitative relationship among the harmonics of the resultant MMF, the arrangement of armature windings, and the input currents. Practical implications of this method include enabling more accurate prediction of machine performance, as well as optimizing machine design in both quantitative and qualitative respects.INDEX TERMS AC machine, armature winding, MMF harmonic, analytical method, closed form equation.

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A rapid method of analysing the m.m.f. wave of a single or polyphase winding

Cited by 18 publications

References 0 publications

Investigation Into Multi-Layer Fractional-Slot Concentrated Windings With Unconventional Slot-Pole Combinations

Investigation Into Multi-Layer Fractional-Slot Concentrated Windings With Unconventional Slot-Pole Combinations

Maximum MMF reduction using the Newton Raphson method

A Versatile Analytical Method of Investigating MMF Harmonics of Armature Windings

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