Overview of the rectangular wire windings AC electrical machine

Zhao, Yu; Li, Dawei; Pei, Tonghao; Qu, Ronghai

doi:10.30941/cestems.2019.00022

Cited by 85 publications

(47 citation statements)

References 29 publications

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“…The losses of any electrical machines are of diverse nature [15], namely: stator and rotor current losses [16], [17], iron loss [18], [19], stray-load loss [20], [21], and windage loss [22], [23]. Excitation loss, brush loss, and bearings loss are taken into account when necessary.…”

Section: Weighting Factormentioning

confidence: 99%

See 1 more Smart Citation

Efficiency Mapping and Weighted Average Efficiency for Large Hydrogenerators

Bortoni

Siniscalchi

Vaschetto

et al. 2021

IEEE Open J. Ind. Applicat.

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This paper presents the concept of efficiency mapping for large synchronous hydrogenerators, which are useful for evaluating hydropower generation performance vis-àvis interconnected intermittent generation to machine efficiencyoriented design. Tests for loss segregation at rated conditions are needed, and models for loss variation along all operational areas are presented. The weighted average efficiency is obtained as the summation of all operating load point efficiencies times related weights, defined according to criteria or from a 2D-histogram of machine operation. The proposed methodology is applied and compared for two machine designs and to an existent machine under operation.

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Section: Weighting Factormentioning

confidence: 99%

“…4. Armature resistance loss (short-circuit loss) and stray-load loss dependence with the square of armature current, as described in the IEEE STD 115 [16]. Fig.…”

Section: Arctan /mentioning

confidence: 99%

Efficiency Mapping and Weighted Average Efficiency for Large Hydrogenerators

Bortoni

Siniscalchi

Vaschetto

et al. 2021

IEEE Open J. Ind. Applicat.

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“…Rectangular conductor designs are a well-known approach to increase the copper slot fill factor in comparison to a round wire design. A state-of-the-art approach is using parallel slot designs with rectangular conductors of the same size in a so called hairpin winding design [2][3][4][5][6][7]. Only few studies focus on parallel teeth such as [3] where rectangular conductors of the same size are inserted into the notch.…”

Section: Introductionmentioning

confidence: 99%

“…A widely studied field is the loss calculation of ac-copper losses within the winding in two dimensional [5] or three dimensional [4] electromagnetic simulations. Comparison of round wire designs and rectangular wire designs can be found in [2,5]. The authors of both publications focus on the loss comparison of the two designs.…”

Section: Introductionmentioning

confidence: 99%

Influence of the Preformed Coil Design on the Thermal Behavior of Electric Traction Machines

2021

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Preformed coils are used in electrical machines to improve the copper slot fill factor. A higher utilization of the machine can be realized. The improvement is a result of both, low copper losses due to the increased slot fill factor and an improved heat transition out of the slot. In this study, the influence of these two aspects on the operational improvement of the machine is studied. Detailed simulation models allow a separation of the two effects. A preform wound winding in comparison to a round wire winding is studied. Full machine prototypes as well as motorettes of the two designs are built up. Thermal finite element models of the stator slot are developed and parameterized with the help of motorette microsections. The resulting thermal lumped parameter model is enlarged to represent the entire electric machine. Electromagnetic finite element models for loss calculation and the thermal lumped parameter models are parameterized using test bench measurements. The developed models show very good agreement in comparison to the test bench evaluation. The study indicates that both, the improvements in the heat transition path and the advantages of the reduced losses in the slot contribute to the improved operational range in dependency of the studied operational point.

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“…In order to prevent these problems, there are techniques such as adopting a high coercive force magnet with a large amount of rare earth such as Dy or Tb added, or a distributed winding stator structure using a preformed rectangular wire bar preformed to shorten the coil-end and reduce the resistance value. However, the cost increases [14]. Another study, although the design concept is different, as a first one, a brushless wound-field type threephase synchronous motor that self-starts by using Gerges phenomenon at the time of starting is reported [15].…”

Section: Introductionmentioning

confidence: 99%

Experimental Verification With Loads of Line-Start Type Self-Excited Wound-Field Motor With Three-Phase Concentrated Winding Stators

Aoyama

Saito

Mizuta

et al. 2021

IEEE Trans. Energy Convers.

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This paper describes a novel line-start type selfexcited wound-field synchronous motor with three-phase concentrated winding stator. The unique feature of this proposed motor is that it accelerates by obtaining the starting torque from the slip frequency at the time of starting, and at the time of synchronous pull-in, it is driven synchronously with utilizing the second order space harmonic as the field magnetization power. This driving principle was verified by performing a load test using the prototype with two types of load, fan load and eddy current brake load. Consequently, the synchronization based on the proposed drive principle could be demonstrated on the actual machine, and the line-start characteristics of the proposed motor have been clarified.

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Overview of the rectangular wire windings AC electrical machine

Cited by 85 publications

References 29 publications

Efficiency Mapping and Weighted Average Efficiency for Large Hydrogenerators

Efficiency Mapping and Weighted Average Efficiency for Large Hydrogenerators

Influence of the Preformed Coil Design on the Thermal Behavior of Electric Traction Machines

Experimental Verification With Loads of Line-Start Type Self-Excited Wound-Field Motor With Three-Phase Concentrated Winding Stators

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