Advanced optimization methods for fractional slot concentrated windings

Dajaku, Gurakuq; Spas, Sachar; Gerling, Dieter

doi:10.1007/s00202-019-00760-6

Cited by 21 publications

(11 citation statements)

References 52 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Afterwards, the divided windings are connected in series with each other. During the manipulation of the stator, the rotor is not changed [1,3,33]. This method is described in Section 3.2 by an example.…”

Section: Stator Slot Shifting Conceptmentioning

confidence: 99%

“…In order to cancel the seventh space harmonic because of radial force magnitude [4,24], as introduced in Refs. [1,3], by using the stator shift concept equal to the 5/2 slot, the extended 24-slot stator will emerge, and the new stator MMF wave shape and the corresponding MMF spectrum are given in Figure 4.…”

Section: Original Windingsmentioning

confidence: 99%

“…Still, α shif t ¼ 5 2 is selected here, as introduced in Refs. [1,3] and used in Ref. [44], for the PM-assisted synchronous reluctance machine.…”

Section: Original Windingsmentioning

confidence: 99%

“…PM synchronous machines with fractional-slot concentratedwindings (FSCW) are widely used in several industry applications. These kinds of windings offer the advantage of short end-winding, high slot filling factor, low cogging torque, great fault tolerance, good field-weakening characteristics, simplicity and low-cost manufacturing [1][2][3][4][5][6][7]. Besides that, in the case of single-or two-layer winding, they show a less complex arrangement.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

Araghi

Kiyoumarsi

Dehkordi

2022

IET Electric Power Appl

View full text Add to dashboard Cite

Fractional‐slot concentrated‐windings are appreciated for their simple construction, short end‐winding length, high copper fill factor, low cogging torque, good field‐weakening capability and fault‐tolerant ability. However, in comparison to the conventional distributed windings, the fractional‐slot concentrated‐windings are characterised with high space magnetomotive force (MMF) harmonics, which results in undesirable effects on the machine performance, such as localised core saturation, eddy current loss in the rotor and noise and vibration. In order to improve winding characteristics, several techniques have been developed recently. This manuscript introduces the 5 new winding topologies by using the general concept of stator slot shifting. It means that, in order to cancel undesirable MMF harmonics, by doubling (or tripling or even multiplying) the slot number and dividing the winding and then relatively shifting the winding by one (or more) slots, the undesirable harmonics have been eliminated effectively. The best choice is chosen according to the lowest amount of the MMF harmonic, highest value of winding factor and torque desirable characteristics. At the end, comprehensive comparisons for the designed synchronous reluctance motor (SynRel) equipped with proposed windings and also distributed winding are presented. The analytical study and 2D FEM analysis results show that it is possible to get an ideal low space‐harmonic winding topology, and consequently, a low torque ripple for these motors.

show abstract

Section: Stator Slot Shifting Conceptmentioning

confidence: 99%

Section: Original Windingsmentioning

confidence: 99%

“…Still, α shif t ¼ 5 2 is selected here, as introduced in Refs. [1,3] and used in Ref. [44], for the PM-assisted synchronous reluctance machine.…”

Section: Original Windingsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

Araghi

Kiyoumarsi

Dehkordi

2022

IET Electric Power Appl

View full text Add to dashboard Cite

show abstract

“…Therefore, many research studies have been made to avoid the bad selection of slot/pole combinations [4], [5]. In addition, to furtherly reduce or eliminate parasitic harmonics of classical slot/pole combinations of FSCW, various techniques have been proposed [6]. Stator shifting method is the most common one, which can significantly reduce the loss-producing harmonics and improve the flux weakening performance by extending the one slot coil pitch to two slots [7]- [9].…”

Section: Introductionmentioning

confidence: 99%

A Novel Five-Phase Fractional Slot Concentrated Winding with Low Space Harmonic Contents

et al. 2021

View full text Add to dashboard Cite

In this article, a novel five-phase fractional-slot concentrated winding (FSCW) with 20-slot/22-pole is presented. It benefits not only the advantages of conventional FSCW but also weak space harmonics of magnetomotive force (MMF). The winding allows eliminating the first sub-order harmonic. The new layout of the winding topology is obtained by a combination of stator shift technique of the winding in the slots with a special coupling of the windings (star-pentagon), using winding function theory. The high performances of the new winding layout are validated using the finite element method (FEM). Compared to the conventional winding, the winding factor and the total harmonic distortion (THD) of MMF are improved by 1.3% and 2.2%, respectively. With the same injection of current density, the average output torque is increased by 1% and the torque ripple is decreased by 60%. The eddy current losses in the permanent magnets (PMs) at rated speed (600 r/min) and 2100 r/min speed are improved by 67% and 56%, respectively. Index Terms-5-phase permanent magnet (PM) machine, finite element analysis, low-harmonic contents.

show abstract

Improved calculation of the slot leakage inductance of different slot shapes

Laksar

2020

Electr Eng

View full text Add to dashboard Cite

Advanced optimization methods for fractional slot concentrated windings

Cited by 21 publications

References 52 publications

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

Synchronous reluctance machines with new type of fractional‐slot concentrated‐windings based on the concept of stator slot shifting

A Novel Five-Phase Fractional Slot Concentrated Winding with Low Space Harmonic Contents

Improved calculation of the slot leakage inductance of different slot shapes

Contact Info

Product

Resources

About